nRF5 action!

NeverDie

Anyone have a good sketch for measuring the battery supplied voltage on an nRF52? Some of the concepts from the old atmega328p may apply, but the specifics are going to be different, I'm sure.

Mike_Lemo

Check on adafruits feather reference they use two resistors as a voltage divider for that simple and effective.

NeverDie

@Mike_Lemo said in nRF5 Bluetooth action!:

Check on adafruits feather reference they use two resistors as a voltage divider for that simple and effective.

I'm not finding it. Do you have a link?

Mike_Lemo

@NeverDie https://learn.adafruit.com/assets/39913

Top right corner of the schematic.

Mike_Lemo

@NeverDie but a much better but more expensive solution would be a lipo fuel guage from spark fun they use a Max chip for that.

Nca78

If supplied with less than 3.6V you can do it with ADC, 1.2V voltage reference and 1/3 prescaling.
But I've only looked at the theory yet.

Rules are Vdd+0.3V max at the pin, and max 2.4V as input of ADC (after prescaling)

NeverDie

Well, as you all know, on the atmega328p you can read the 1.1v gap voltage using the battery voltage as the reference voltage, by doing analogRead(A0), and from just that one measurement then calculate the battery voltage by doing a little bit of math. So, I'm just wondering what the code is to do the equivalent of that (using 1.2v instead of 1.1v) on the nRF52832.

d00616

@Nca78 said in nRF5 Bluetooth action!:

If supplied with less than 3.6V you can do it with ADC, 1.2V voltage reference and 1/3 prescaling.
But I've only looked at the theory yet.

For this, you can use the implemented hwCPUVoltage() function. Reading the voltage costs nRF51: 260µA/20µs | nRF52: 700µA/3µs

NeverDie

@d00616 said in nRF5 Bluetooth action!:

hwCPUVoltage()

I'm finally installing Visual Micro, because I hope it will help me quickly find where all these functions are defined. With all these new layers, the Arduino IDE is just no longer cutting it.

NeverDie

LOL. Well, Visual Micro found it alright, but just in the wrong place. It found it in MyHwAVR.cpp

scalz

@NeverDie said in nRF5 Bluetooth action!:

@d00616 said in nRF5 Bluetooth action!:

hwCPUVoltage()

I'm finally installing Visual Micro, because I hope it will help me quickly find where all these functions are defined. With all these new layers, the Arduino IDE is just no longer cutting it.

good choice
for nrf5, the function is located in MyHwNRF5.cpp

NeverDie

@d00616 said in nRF5 Bluetooth action!:

For this, you can use the implemented hwCPUVoltage() function.

I tried this function call on an nRF52 DK, and it seems to work. I then tried it on an Ebyte module, treated as an nRF52 DK "board", and it reported zero voltage. So, probably I just need to do a pin mapping so that it reads the voltage on the proper pin. But which pin/mapping would it be? I thought that Vcc wouldn't really be mappable to anything but Vcc. I guess whichever analog pin (if that's what it is?) is connected to Vcc on the nRF52 DK is the pin I need to find and re-map to its equivalent pin on the Ebyte module. Hmmm.... I'll have to look into which one that would be.

NeverDie

Actually, something different may be going on. Here's the function definition:

uint16_t hwCPUVoltage()
{
	// VDD is prescaled 1/3 and compared with the internal 1.2V reference
	Serial.println("Inside hwCPUVoltage function.");
#if defined(NRF_ADC)
    Serial.println("This is an NRF_ADC.");
	// NRF51:
	// Sampling is done with lowest resolution to minimize the time
	// 20uS@260uA

	// Concurrent ressource: disable
	uint32_t lpcomp_enabled = NRF_LPCOMP->ENABLE;
	NRF_LPCOMP->ENABLE = 0;

	// Enable and configure ADC
	NRF_ADC->ENABLE = 1;
	NRF_ADC->CONFIG = (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos) |
	                  (ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos) |
	                  (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
	                  (ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
	                  (ADC_CONFIG_RES_8bit << ADC_CONFIG_RES_Pos);
	NRF_ADC->EVENTS_END = 0;
	NRF_ADC->TASKS_START = 1;
	while(!NRF_ADC->EVENTS_END);
	NRF_ADC->EVENTS_END = 0;
	int32_t sample = (int32_t)NRF_ADC->RESULT;
	NRF_ADC->TASKS_STOP = 1;
	NRF_ADC->ENABLE = 0;

	// Restore LPCOMP state
	NRF_LPCOMP->ENABLE = lpcomp_enabled;

	return (sample*3600)/255;

#elif defined(NRF_SAADC)
	// NRF52:
	// Sampling time 3uS@700uA
	Serial.println("This is an NRF_SAADC.");
	int32_t sample;
	NRF_SAADC->ENABLE = SAADC_ENABLE_ENABLE_Enabled << SAADC_ENABLE_ENABLE_Pos;
	NRF_SAADC->RESOLUTION = SAADC_RESOLUTION_VAL_8bit << SAADC_RESOLUTION_VAL_Pos;
	NRF_SAADC->CH[0].PSELP = SAADC_CH_PSELP_PSELP_VDD << SAADC_CH_PSELP_PSELP_Pos;
	NRF_SAADC->CH[0].CONFIG = (SAADC_CH_CONFIG_BURST_Disabled << SAADC_CH_CONFIG_BURST_Pos) |
	                          (SAADC_CH_CONFIG_MODE_SE << SAADC_CH_CONFIG_MODE_Pos) |
	                          (SAADC_CH_CONFIG_TACQ_3us << SAADC_CH_CONFIG_TACQ_Pos) |
	                          (SAADC_CH_CONFIG_REFSEL_Internal << SAADC_CH_CONFIG_REFSEL_Pos) |
	                          (SAADC_CH_CONFIG_GAIN_Gain1_6 << SAADC_CH_CONFIG_GAIN_Pos) |
	                          (SAADC_CH_CONFIG_RESN_Bypass << SAADC_CH_CONFIG_RESN_Pos) |
	                          (SAADC_CH_CONFIG_RESP_Bypass << SAADC_CH_CONFIG_RESP_Pos);
	NRF_SAADC->OVERSAMPLE = SAADC_OVERSAMPLE_OVERSAMPLE_Bypass << SAADC_OVERSAMPLE_OVERSAMPLE_Pos;
	NRF_SAADC->SAMPLERATE = SAADC_SAMPLERATE_MODE_Task << SAADC_SAMPLERATE_MODE_Pos;
	NRF_SAADC->RESULT.MAXCNT = 1;
	NRF_SAADC->RESULT.PTR = (uint32_t)&sample;

	NRF_SAADC->EVENTS_STARTED = 0;
	NRF_SAADC->TASKS_START = 1;
	while (!NRF_SAADC->EVENTS_STARTED);
	NRF_SAADC->EVENTS_STARTED = 0;

	NRF_SAADC->EVENTS_END = 0;
	NRF_SAADC->TASKS_SAMPLE = 1;
	while (!NRF_SAADC->EVENTS_END);
	NRF_SAADC->EVENTS_END = 0;

	NRF_SAADC->EVENTS_STOPPED = 0;
	NRF_SAADC->TASKS_STOP = 1;
	while (!NRF_SAADC->EVENTS_STOPPED);
	NRF_SAADC->EVENTS_STOPPED = 1;

	NRF_SAADC->ENABLE = (SAADC_ENABLE_ENABLE_Disabled << SAADC_ENABLE_ENABLE_Pos);

	return (sample*3600)/255;
#else
	Serial.println("Unknown MCU!!");
	// unknown MCU
	return 0;
#endif
}

One, perhaps likely, theory would be that it doesn't recognize the MCU, which would explain why it returns the value of zero. Well, to debug that, I added the Serial.println(...) statements into the library code (see above) in an attempt to see which of the if-else branches is being taken, but none of the Serial.println(...)'s were printed! Here's a sample of the output from the Ebyte Module:

332641 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
332968 TSF:MSG:READ,0-0-255,s=255,c=3,t=8,pt=1,l=1,sg=0:0
332973 TSF:MSG:FPAR OK,ID=0,D=1
334649 TSM:FPAR:OK
334650 TSM:ID
334651 TSM:ID:REQ
334654 TSF:MSG:SEND,255-255-0-0,s=59,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
336662 TSM:ID
336663 TSM:ID:REQ
336665 TSF:MSG:SEND,255-255-0-0,s=23,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
338673 TSM:ID
338674 TSM:ID:REQ
338676 TSF:MSG:SEND,255-255-0-0,s=242,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
340684 TSM:ID
340685 TSM:ID:REQ
340687 TSF:MSG:SEND,255-255-0-0,s=205,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
342695 !TSM:ID:FAIL
342696 TSM:FAIL:CNT=7
342698 TSM:FAIL:DIS
342700 TSF:TDI:TSL
402703 TSM:FAIL:RE-INIT
402705 TSM:INIT
402706 TSM:INIT:TSP OK
402708 TSM:FPAR
402711 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
403472 TSF:MSG:READ,0-0-255,s=255,c=3,t=8,pt=1,l=1,sg=0:0
403478 TSF:MSG:FPAR OK,ID=0,D=1
404719 TSM:FPAR:OK
404720 TSM:ID
404721 TSM:ID:REQ
404724 TSF:MSG:SEND,255-255-0-0,s=241,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
406732 TSM:ID
406733 TSM:ID:REQ
406735 TSF:MSG:SEND,255-255-0-0,s=205,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
408743 TSM:ID
408744 TSM:ID:REQ
408747 TSF:MSG:SEND,255-255-0-0,s=168,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
410754 TSM:ID
410755 TSM:ID:REQ
410757 TSF:MSG:SEND,255-255-0-0,s=131,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
412765 !TSM:ID:FAIL
412766 TSM:FAIL:CNT=7
412768 TSM:FAIL:DIS
412770 TSF:TDI:TSL
472773 TSM:FAIL:RE-INIT
472775 TSM:INIT
472776 TSM:INIT:TSP OK
472778 TSM:FPAR
472781 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
472955 TSF:MSG:READ,0-0-255,s=255,c=3,t=8,pt=1,l=1,sg=0:0
472960 TSF:MSG:FPAR OK,ID=0,D=1
474789 TSM:FPAR:OK
474790 TSM:ID
474791 TSM:ID:REQ
474794 TSF:MSG:SEND,255-255-0-0,s=167,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
476802 TSM:ID
476803 TSM:ID:REQ
476805 TSF:MSG:SEND,255-255-0-0,s=131,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
478813 TSM:ID
478814 TSM:ID:REQ
478816 TSF:MSG:SEND,255-255-0-0,s=94,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
480824 TSM:ID
480825 TSM:ID:REQ
480827 TSF:MSG:SEND,255-255-0-0,s=57,c=3,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
482835 !TSM:ID:FAIL
482836 TSM:FAIL:CNT=7
482838 TSM:FAIL:DIS
482840 TSF:TDI:TSL

I'm not quite sure how to interpret that, but pretty clearly it doesn't contain the println's that I was expecting.

Any theories as to what's going on?

NeverDie

Bracketing that and setting it aside, I do now notice this line in the BatteryPoweredSensor demo sketch:

int BATTERY_SENSE_PIN = A0;  // select the input pin for the battery sense point

So, if I map that A0 in the sketch to the A0 of the Ebyte Module, then maybe (hopefully) the voltage measurement will work on the Ebyte Module. I'll give it a try.

NeverDie

Unfortunately, after I add:

#include <mySensors.h>

the locus of control goes somewhere else (I guess the gateway or something?). Anyhow, it makes this very hard to debug.

For instance, the pin of interest is PIN_AIN0. I can't find where it's defined, and I can't print out its value either, because of this locus of control issue.

Anyhow, I think I may wait for others to get up and running with their modules, and start facing the same issues. Maybe then we can help each other figure this stuff out.

d00616

@NeverDie I don't know why the println() doesn't work. There is an "DEBUG_OUTPUT(x, ##VA_ARGS)" macro, you can use when debug is enabled.

NRF_ADC is the nRF51 ADC and NRF_SAADC is the ADC of the nRF52. They are defined when "nrf.h" is included.

What board type have use used for your tests?

NeverDie

@d00616 said in nRF5 Bluetooth action!:

What board type have use used for your tests?

The nRF52832 Ebyte Module.

Terrence

@NeverDie VS Code with the Arduino Extension is your friend.

NeverDie

@d00616 said in nRF5 Bluetooth action!:

What board type have use used for your tests?

I just re-read your question and realized you were asking something else than the question that I answered above.

Answer: nRF52 DK is the board type, because I wired directly to P0.06 as its Tx pin on the Ebyte nRF52832 Module.

NeverDie

@Terrence said in nRF5 Bluetooth action!:

VS Code with the Arduino Extension is your friend.

I'll try that. Maybe it will be a little less of a learning curve than Visual Micro yet still do what I need.

NeverDie

I just now did a brute force hack of the MySensors BatteryPoweredSensor sketch, where I copied and renamed the hwCPUVoltage function from the library and then called it from within a tight loop so that I never lose the locus of control. It worked!

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * DESCRIPTION
 *
 * This is an example that demonstrates how to report the battery level for a sensor
 * Instructions for measuring battery capacity on A0 are available here:
 * http://www.mysensors.org/build/battery
 *
 */



// Enable debug prints to serial monitor
//#define MY_DEBUG

// Enable and select radio type attached
//#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69
#define MY_RADIO_NRF5_ESB

//#include <MySensors.h>

int BATTERY_SENSE_PIN = A0;  // select the input pin for the battery sense point

//unsigned long SLEEP_TIME = 900000;  // sleep time between reads (seconds * 1000 milliseconds)
unsigned long SLEEP_TIME = 1000;  // sleep time between reads (seconds * 1000 milliseconds)
int oldBatteryPcnt = 0;

uint16_t counter=0;
uint16_t volts=0;

uint16_t theHwCPUVoltage()
{
  // VDD is prescaled 1/3 and compared with the internal 1.2V reference
  Serial.println("Inside hwCPUVoltage function.");
#if defined(NRF_ADC)
    Serial.println("This is an NRF_ADC.");
  // NRF51:
  // Sampling is done with lowest resolution to minimize the time
  // 20uS@260uA

  // Concurrent ressource: disable
  uint32_t lpcomp_enabled = NRF_LPCOMP->ENABLE;
  NRF_LPCOMP->ENABLE = 0;

  // Enable and configure ADC
  NRF_ADC->ENABLE = 1;
  NRF_ADC->CONFIG = (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos) |
                    (ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos) |
                    (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
                    (ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
                    (ADC_CONFIG_RES_8bit << ADC_CONFIG_RES_Pos);
  NRF_ADC->EVENTS_END = 0;
  NRF_ADC->TASKS_START = 1;
  while(!NRF_ADC->EVENTS_END);
  NRF_ADC->EVENTS_END = 0;
  int32_t sample = (int32_t)NRF_ADC->RESULT;
  NRF_ADC->TASKS_STOP = 1;
  NRF_ADC->ENABLE = 0;

  // Restore LPCOMP state
  NRF_LPCOMP->ENABLE = lpcomp_enabled;

  return (sample*3600)/255;

#elif defined(NRF_SAADC)
  // NRF52:
  // Sampling time 3uS@700uA
  Serial.println("This is an NRF_SAADC.");
  int32_t sample;
  NRF_SAADC->ENABLE = SAADC_ENABLE_ENABLE_Enabled << SAADC_ENABLE_ENABLE_Pos;
  NRF_SAADC->RESOLUTION = SAADC_RESOLUTION_VAL_8bit << SAADC_RESOLUTION_VAL_Pos;
  NRF_SAADC->CH[0].PSELP = SAADC_CH_PSELP_PSELP_VDD << SAADC_CH_PSELP_PSELP_Pos;
  NRF_SAADC->CH[0].CONFIG = (SAADC_CH_CONFIG_BURST_Disabled << SAADC_CH_CONFIG_BURST_Pos) |
                            (SAADC_CH_CONFIG_MODE_SE << SAADC_CH_CONFIG_MODE_Pos) |
                            (SAADC_CH_CONFIG_TACQ_3us << SAADC_CH_CONFIG_TACQ_Pos) |
                            (SAADC_CH_CONFIG_REFSEL_Internal << SAADC_CH_CONFIG_REFSEL_Pos) |
                            (SAADC_CH_CONFIG_GAIN_Gain1_6 << SAADC_CH_CONFIG_GAIN_Pos) |
                            (SAADC_CH_CONFIG_RESN_Bypass << SAADC_CH_CONFIG_RESN_Pos) |
                            (SAADC_CH_CONFIG_RESP_Bypass << SAADC_CH_CONFIG_RESP_Pos);
  NRF_SAADC->OVERSAMPLE = SAADC_OVERSAMPLE_OVERSAMPLE_Bypass << SAADC_OVERSAMPLE_OVERSAMPLE_Pos;
  NRF_SAADC->SAMPLERATE = SAADC_SAMPLERATE_MODE_Task << SAADC_SAMPLERATE_MODE_Pos;
  NRF_SAADC->RESULT.MAXCNT = 1;
  NRF_SAADC->RESULT.PTR = (uint32_t)&sample;

  NRF_SAADC->EVENTS_STARTED = 0;
  NRF_SAADC->TASKS_START = 1;
  while (!NRF_SAADC->EVENTS_STARTED);
  NRF_SAADC->EVENTS_STARTED = 0;

  NRF_SAADC->EVENTS_END = 0;
  NRF_SAADC->TASKS_SAMPLE = 1;
  while (!NRF_SAADC->EVENTS_END);
  NRF_SAADC->EVENTS_END = 0;

  NRF_SAADC->EVENTS_STOPPED = 0;
  NRF_SAADC->TASKS_STOP = 1;
  while (!NRF_SAADC->EVENTS_STOPPED);
  NRF_SAADC->EVENTS_STOPPED = 1;

  NRF_SAADC->ENABLE = (SAADC_ENABLE_ENABLE_Disabled << SAADC_ENABLE_ENABLE_Pos);

  return (sample*3600)/255;
#else
  Serial.println("Unknown MCU!!");
  // unknown MCU
  return 0;
#endif
}


void setup()
{
  Serial.begin(115200);
  Serial.println("Setup procedure beginning.");
  while (true) {
    volts=theHwCPUVoltage();
    Serial.print("counter=");
    Serial.print(counter++);
    Serial.print(", hwCPUVoltage=");
    Serial.println(volts);
  }
	// use the 1.1 V internal reference
//#if defined(__AVR_ATmega2560__)
//	analogReference(INTERNAL1V1);
//#else
//	analogReference(INTERNAL);
//#endif
}

Here is a sample of the output:

Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5013, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5014, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5015, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5016, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5017, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5018, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5019, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5020, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5021, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5022, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5023, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5024, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5025, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5026, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5027, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5028, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5029, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5030, hwCPUVoltage=3289
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5031, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5032, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5033, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5034, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5035, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5036, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5037, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5038, hwCPUVoltage=3289
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5039, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5040, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5041, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5042, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5043, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5044, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5045, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5046, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5047, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.

counter=5048, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5049, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5050, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5051, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5052, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5053, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5054, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5055, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5056, hwCPUVoltage=3303
Inside hwCPUVoltage function.
This is an NRF_SAADC.
counter=5057, hwCPUVoltage=3303

NeverDie

Besides that it can now do println()'s, the other good news is that it looks like I won't need to change the pin assignment.

Too bad the demo sketch only transmits one byte of voltage information, rather than two bytes.

d00616

@NeverDie said in nRF5 Bluetooth action!:

I tried this function call on an nRF52 DK, and it seems to work. I then tried it on an Ebyte module, treated as an nRF52 DK "board", and it reported zero voltage.

I have tried the hwCPUVoltage() function with an Ebyte and an RedBear module. Both modules are reporting the voltage.

NeverDie

Received a new module. Here's a size comparison with the Ebyte Module:

NeverDie

Breakout board for the Ebyte nRF52832 module is now completed:
https://www.openhardware.io/view/436/nRF52832-Breakout-Board#tabs-comments

Mike_Lemo

@NeverDie Dam you why would you make it so wide? can it fit on a single bread board?

Also how did you get those so fast?

NeverDie

@Mike_Lemo said in nRF5 Bluetooth action!:

Dam you why would you make it so wide?

In 20/20 hindsight, you're right. At the time I designed it I had huge concerns that the range on the nRF52832 might be awful, because the Adafruit nRF52832 feather that I tested had poor range. So, I gave it a very large ground plane to see if maybe that cured the problem. Only later did I receive the Ebyte module, which turned out to have good range even by itself.

can it fit on a single bread board?

Sorry, you'll need two.

Also how did you get those so fast?

OSH PARK averages around two weeks for me. That's the main reason why I buy from them.

mtiutiu

@NeverDie
Where did you get that small nrf52832 module?

NeverDie

@mtiutiu said in nRF5 Bluetooth action!:

@NeverDie
Where did you get that small nrf52832 module?

Here: https://www.aliexpress.com/item/NRF52832-Bluetooth-4-2-module-Bluetooth-5-program-PCBA-serial-transmission-cost-effective/32818791344.html?spm=a2g0s.9042311.0.0.jWh9gH

Nca78

@NeverDie I guess you don't need to make a breakout board for those, your spare NModules will do if you use the "PA/LNA" radio footprint

NeverDie

@Nca78
Thanks! Good to know.

Nca78

Just realized it has 2 extra I/O on the side, and the SWD are only pads on top, which makes 8 I/O available, it's much more interesting than the NRF51822 version.

NeverDie

@Nca78
Is there even a way to program the nRF51822 version? I'd have to check, but I don't recall the two SWD pins being on its pinout.

Nca78

@NeverDie said in nRF5 Bluetooth action!:

@Nca78
Is there even a way to program the nRF51822 version? I'd have to check, but I don't recall the two SWD pins being on its pinout.

They are on the pinout, so you only have 4 I/Os available.

NeverDie

@d00616 said in nRF5 Bluetooth action!:

I have tried the hwCPUVoltage() function with an Ebyte and an RedBear module. Both modules are reporting the voltage.

That's good news. There must be something wrong with how I'm doing it. Which board type are you using for the Ebyte module?

Mike_Lemo

From what I understand the NRF52832 has some kind of enforcer that allows different serial hardwares to be assigned to different pins

Now using the arduino IDE I want to use the I2C pins that are assigned hardwarely to different pins here is the situation

I have one PCB that has SCL connected to pin 20 and SDA to 21

and another PCB that has SCL connected to pin 11 and SDA to pin 12

I want to define the enforcer for the pins within their dedicated sketches without running around to the internal arduino files and change the pin assignment for each upload to each board.

How'd I do that? I assume you'd have to do some thing like that in the upper side of the personal code.

#define SDL...(Something else I don't know ) 11
#define SDA...(Something else I don't know ) 12

NeverDie

I think I have a better hypothesis as to what's going on in my situation: the ebyte module is getting hung-up trying to establish communication with the serial gateway. Looking at the output of the serial gateway, it looks as though it is receiving packets from the Ebyte module. However, looking at the Ebyte output, it thinks it is failing. So, the Ebyte never quite gets out of the "establish communication link" mode.

This doesn't occur, though, if I use an nRF52 DK, instead of an Ebyte module.

So, what might explain this is maybe the MISO pin on the Ebyte module isn't mapped right.

@d00616 Would you please share the pin mappings and board type that you are using for your ebyte module? Since you are having success, I think that will fix the problem.

Mike_Lemo

Does anybody know why the function tone() doesn't work for the nrf52?

mfalkvidd

@Mike_Lemo could you be slightly more specific than "doesn't work"?

Mike_Lemo

@mfalkvidd said in nRF5 Bluetooth action!:

@Mike_Lemo could you be slightly more specific than "doesn't work"?

apparently it doesn't recognize it says tone wasn't declared in this scope

That's how the line looks tone(BUZZER_PIN, BUZZER_TONE);
BUZZER_PIN = 26
BUZZER_TONE = 3000

mfalkvidd

@Mike_Lemo if you mean the stuff described at https://www.arduino.cc/en/Reference/Tone it's because it only supports the following mcus:
ATmega8
ATmega168/328
ATmega1280

Mike_Lemo

@mfalkvidd said in nRF5 Bluetooth action!:

@Mike_Lemo if you mean the stuff described at https://www.arduino.cc/en/Reference/Tone it's because it only supports the following mcus:
ATmega8
ATmega168/328
ATmega1280

How is it possible to make it copatible with the NRF52?

mfalkvidd

@Mike_Lemo it (the tone library) would need to be ported

Mike_Lemo

@mfalkvidd said in nRF5 Bluetooth action!:

@Mike_Lemo it would need to be ported

No idea what you are talking about.

mfalkvidd

@Mike_Lemo look it up? https://en.wikipedia.org/wiki/Software_portability#Effort_to_port_source_code

NeverDie

@NeverDie said in nRF5 Bluetooth action!:

I think I have a better hypothesis as to what's going on in my situation: the ebyte module is getting hung-up trying to establish communication with the serial gateway. Looking at the output of the serial gateway, it looks as though it is receiving packets from the Ebyte module. However, looking at the Ebyte output, it thinks it is failing. So, the Ebyte never quite gets out of the "establish communication link" mode.

This doesn't occur, though, if I use an nRF52 DK, instead of an Ebyte module.

So, what might explain this is maybe the MISO pin on the Ebyte module isn't mapped right.

@d00616 Would you please share the pin mappings and board type that you are using for your ebyte module? Since you are having success, I think that will fix the problem.

Some further evidence in support of this hypothesis (from: https://github.com/mysensors/ArduinoHwNRF5

Most components, like UART, SPI, Wire Bus, of the nRF5 series chips don't have a fixed pin mapping.

Mike_Lemo

@mfalkvidd said in nRF5 Bluetooth action!:

@Mike_Lemo look it up? https://en.wikipedia.org/wiki/Software_portability#Effort_to_port_source_code

Well apperantly this function uses a PWM pin at 50% duty but the frequency varies according to the functiong user parameter now I just know how to active a PWM pin at 50% duty but not how to acces the NRF52 registers to change the frequency of the PWM.

I don't realy know how to access the registers you see at the product's PDF and the other process.

Mike_Lemo

Someone managed to get NFC to work with this IC on the arduino IDE?

NeverDie

Does the nRF52 mcu communicate with its radio using SPI, or some other bus? Or are all the radio registers simply memory mapped?

@NeverDie said in nRF5 Bluetooth action!:

Some further evidence in support of this hypothesis (from: https://github.com/mysensors/ArduinoHwNRF5

Most components, like UART, SPI, Wire Bus, of the nRF5 series chips don't have a fixed pin mapping.

Well, if the mcu uses SPI to communicate with the radio, then I simply need to define which SPI "pins" those are. Attached is the pin mapping file that I used to successfully map the pins for Rx and Tx.
0_1501606355303_MyNRF5Board.cpp

Nca78

@NeverDie if I'm not wrong you managed to connect the Ebyte module to your MySensors network, no ?
I did it anyway and it received data.
Radio is internally connected inside the nrf52 chip so I don't see how a module could have a different mapping ?

NeverDie

@Nca78 said in nRF5 Bluetooth action!:

Radio is internally connected inside the nrf52 chip so I don't see how a module could have a different mapping ?

Yeah, that's what I thought originally, and it probably is true. I'm just grasping at straws to understand why the "board" type seems to be affecting the radio communications. I'm also completely new to the mysensors way of handling radio, so that's getting in my way. I'm might have to try something more barebones before I can make sense of this.

Terrence

Some Nordic guidance might help.

Building Bluetooth-Connected IoT Wireless Sensor Prototypes with Minimal Effort

https://www.digikey.com/en/articles/techzone/2017/jul/building-bluetooth-connected-iot-wireless-sensor-prototypes

NeverDie

I've confirmed it now. Even if I comment out all apparent radio message sends, the mere act of including:

#include <MySensors.h>

results in a loss of control by the sketch itself to something within MySensors that wants to establish communication between the node and the gateway. Not even sure how that is happening. In any case, it is just overcomplicating the debugging, and I really don't want that right now because it is effectively hanging what I'm trying to do.

For now, all I want is a simple send packet--like either the mirf or the twh20 libraries have for the nRF24L01--with no complicating factors. Is that too much to ask? I can probably find that somewhere within the library, but how do I turn-off this loop that it's in where it's repetitively trying to establish the initial communication with the serial gateway?

d00616

@NeverDie said in nRF5 Bluetooth action!:

That's good news. There must be something wrong with how I'm doing it. Which board type are you using for the Ebyte module?

I have the equal module like yours.

@NeverDie said in nRF5 Bluetooth action!:

@d00616 Would you please share the pin mappings and board type that you are using for your ebyte module? Since you are having success, I think that will fix the problem.

The module is connected to SWDIO/CLK, VCC and the GND near the radio. I don't remember which pin I used for Serial TX.

@NeverDie said in nRF5 Bluetooth action!:

Does the nRF52 mcu communicate with its radio using SPI, or some other bus? Or are all the radio registers simply memory mapped?

The registers are memory mapped, the data transferred with "EasyDMA" into the memory.

@NeverDie said in nRF5 Bluetooth action!:

I've confirmed it now. Even if I comment out all apparent radio message sends, the mere act of including: '#include <MySensors.h>' results in a loss of control by the sketch itself to something within MySensors that wants to establish communication between the node and the gateway.

The SecurityPersonalizer defines '#define MY_CORE_ONLY' before including 'MySensors.h'. In theory, you can use the radio functions defined in 'hal/transport/MyTransportHAL.h' directly. I had no luck with this, but I haven't invested time to debug this.

d00616

@Mike_Lemo said in nRF5 Bluetooth action!:

I want to define the enforcer for the pins within their dedicated sketches without running around to the internal arduino files and change the pin assignment for each upload to each board.
How'd I do that? I assume you'd have to do some thing like that in the upper side of the personal code.
#define SDL...(Something else I don't know ) 11
#define SDA...(Something else I don't know ) 12

You have to install the "MySensors nRF5 Boards" package. In the examples section for this package, you can find two files (MyNRF5Board.h + MyNRF5Board.cpp). Add these files to your sketch and compile it using "MyNRF5Board nRF52822" as you board.

@Mike_Lemo said in nRF5 Bluetooth action!:

Well apperantly this function uses a PWM pin at 50% duty but the frequency varies according to the functiong user parameter now I just know how to active a PWM pin at 50% duty but not how to acces the NRF52 registers to change the frequency of the PWM.

The registers are documented in the Infocenter and the bitfields.

I don't realy know how to access the registers you see at the product's PDF and the other process.

To access the registers, you have to add '#include <nrf.h>' to your code. Mostly the hardware is accesses by NRF_HWNAME->REGISTER

Doing PWM is a little bit complex. The code is different for nRF51 and nRF52. Look into wiring_analog_nRF51.c and (wiring_analog_nRF51.c)[https://github.com/sandeepmistry/arduino-nRF5/blob/c98a190eb34c0247eb8e0764a6367c7f9e51d2fc/cores/nRF5/wiring_analog_nRF52.c#L214]

If you clone this code, for nRF52 you have to use another timer, like TIMER2, because you can't define the interrupt routine twice.

Nca78

So I'm trying to program the S4AT modules and I have the ugly message

** Programming Started **
auto erase enabled
Info : nRF51822-QFAA(build code: H0) 256kB Flash
Error: Cannot erase protected sector at 0x0
Error: failed erasing sectors 0 to 13
embedded:startup.tcl:454: Error: ** Programming Failed **

I tried to use JLink programs but it says it cannot connect to the module, so I cannot unlock (ends with timeout message) and I cannot erase (fails with -1 return value)...
Does that mean I have to go the long hard way with a bluepill as programmer and openocd ? Anyone has other ideas to unlock and erase the device ?

d00616

@Nca78 said in nRF5 Bluetooth action!:

Does that mean I have to go the long hard way with a bluepill as programmer and openocd ? Anyone has other ideas to unlock and erase the device ?

Select in to Tools menu "None" Softdevice and then "Burn Bootloader". This raises an error but the device is erased completely.

Nca78

@d00616 said in nRF5 Bluetooth action!:

Select in to Tools menu "None" Softdevice and then "Burn Bootloader". This raises an error but the device is erased completely.

Thank you it works !
That's probably when trying to use this function that I managed to unlock&erase the EByte module "by mistake"

The only problem now is the range seems to be very bad
Less than 10m with just a brick wall and it fails to completely send the presentation messages.
EBytes nrf52832 module works well in the same conditions, same for their nrf24 modules.

[Edit] in fact not that bad, it works ok when changing the orientation of the module. Could be due to the funky wiring but my bet is it on the tiny antenna design. My gateway is an old through hole nrf24 clone so range should not be a problem in an appartment with a PA/LNA gateway.

NeverDie

@d00616 said in nRF5 Bluetooth action!:

The registers are memory mapped, the data transferred with "EasyDMA" into the memory.

In this case I'm going to try a different Ebyte module. Maybe the one I'm using is defective or somehow became damaged.

NeverDie

@d00616 said in nRF5 Bluetooth action!:

Select in to Tools menu "None" Softdevice and then "Burn Bootloader". This raises an error but the device is erased completely.

I'm happy to report this also worked when, just now, I programmed a new Ebyte module. Like d00616 said earlier, it's a much faster way to do a mass erase.

Unfortunately, and in contrast with the nRF52 DK, the new Ebyte module I just programmed is behaving the same as the Ebyte I've been experimenting with. No change.

Nca78

I will test tomorrow with the Ebyte module I have soldered, and the reset pin too.

Mike_Lemo

@d00616 said in nRF5 Bluetooth action!:

MySensors nRF5 Boards

Thanks for the caring replay.

I couldn't find that exact "MySensors nRF5 Boards" library you were talking about also what is the purpose of this library anyways?

Do you know where can the arduino library folder be found with all the arduino functions?

Nca78

@Mike_Lemo it is here :
https://github.com/mysensors/ArduinoHwNRF5

Scroll up in this thread for more details, or read the documentation there.

d00616

@Mike_Lemo said in nRF5 Bluetooth action!:

I couldn't find that exact "MySensors nRF5 Boards" library you were talking about also what is the purpose of this library anyways?

Follow the instructions for ArduinoBoards and ArduinoHwNRF5

Do you know where can the arduino library folder be found with all the arduino functions?

The arduino-nrf5 port only implements functionality documented in the official Arduino Reference but mostly not more functionality available for SAMD :-(. Additional functionality like BLE or using included hardware must come from external libraries like MySensors.

A good way to implement the tone commands is to fork the arduino-nRF5 repository at github. Change what you need and create an pull request with reference to the Arduino reference. If you inform me about your PR I comment it to increase the chance for acceptance otherwise it's time to maintain an separate fork of this repository.

NeverDie

@Nca78 said in nRF5 Bluetooth action!:

I will test tomorrow with the Ebyte module I have soldered, and the reset pin too.

That would be great! Please try the BatteryPoweredSensor sketch when you do. I'm very curious if you will have the same or different result as what I'm getting.

Mike_Lemo

@d00616 said in nRF5 Bluetooth action!:

@Mike_Lemo said in nRF5 Bluetooth action!:

I couldn't find that exact "MySensors nRF5 Boards" library you were talking about also what is the purpose of this library anyways?

Follow the instructions for ArduinoBoards and ArduinoHwNRF5

Do you know where can the arduino library folder be found with all the arduino functions?

The arduino-nrf5 port only implements functionality documented in the official Arduino Reference but mostly not more functionality available for SAMD :-(. Additional functionality like BLE or using included hardware must come from external libraries like MySensors.

A good way to implement the tone commands is to fork the arduino-nRF5 repository at github. Change what you need and create an pull request with reference to the Arduino reference. If you inform me about your PR I comment it to increase the chance for acceptance otherwise it's time to maintain an separate fork of this repository.

that actually caused more trouble won't even let me compile the blank included example code.

NeverDie

@Mike_Lemo said in nRF5 Bluetooth action!:

that actually caused more trouble won't even let me compile the blank included example code.

Are you talking about the MyNRF5Board example? Arduino IDE compiles it for me without any complaints.

Mike_Lemo

@NeverDie When choosing "MyNRF5Board nrf52832"?

NeverDie

@Mike_Lemo said in nRF5 Bluetooth action!:

@NeverDie When choosing "MyNRF5Board nrf52832"?

Yup.

NeverDie

At some point, I had to re-arrange the libraries though (don't remember which files or which ones) to get all this stuff working. Before that, it wasn't finding the files. Actually, I think this would be a good topic for discussion, to make sure we're all doing it the same way. If we're doing it differently, it might make cross-checking each others attempts more difficult. Also, maybe there's a better way than the brute-force way that I did it.

If anyone has interest, I can post how my libraries are currently structured. If nothing else, it would be a starting point for discussion on what to do (or not to do).

Mike_Lemo

@NeverDie said in nRF5 Bluetooth action!:

At some point, I had to re-arrange the libraries though (don't remember which files or which ones) to get all this stuff working. Before that, it wasn't finding the files. Actually, I think this would be a good topic for discussion, to make sure we're all doing it the same way. If we're doing it differently, it might make cross-checking each others attempts more difficult. Also, maybe there's a better way than the brute-force way that I did it.

If anyone has interest, I can post how my libraries are currently structured. If nothing else, it would be a starting point for discussion on what to do (or not to do).

Dunno that whole arduino BRF52832 programming thing seems too complicated just started to learn how to use the nordic SDK with eclipse until a proper solution is found.

NeverDie

@Mike_Lemo said in nRF5 Bluetooth action!:

Dunno that whole arduino BRF52832 programming thing seems too complicated just started to learn how to use the nordic SDK with eclipse until a proper solution is found.

It hasn't been easy, I'll grant you that. I get the impression d00616 probably does most of his work in Linux, and so some of the disconnect with the Windows IDE probably stems from that. Once we get the basics ironed out, though, I expect things will go more smoothly. In fact, I think we're almost there. A lot of the work for sleeping, measuring source voltage, etc., has already been done, which is far better than starting from scratch. And there's even example code, which helps tremendously.

NeverDie

Good news! Interestingly enough, the MockMySensors sketch seems to work fine when I load it onto the Ebyte. What a relief! So, I may try hijacking that sketch to convey voltage measurements instead of the BatteryPoweredSensor sketch that mysteriously hasn't been working on my Ebyte modules.

d00616

@Mike_Lemo said in nRF5 Bluetooth action!:

Dunno that whole arduino BRF52832 programming thing seems too complicated just started to learn how to use the nordic SDK with eclipse until a proper solution is found.

The Nordic SDK is more complete than Arduino-nrf5 at the moment, but there is no compatibility with MySensors.

The good news, with SDK 13 the 'Nordic Semiconductor ASA' License was changed. The old ASA was the reason for me to rewrite the complete ESB protocol. Now the license is much less restrictive. I think now the way is open to integrate SDK code into arduino-nrf5 or provide SDK based arduino-libraries.

@NeverDie said in nRF5 Bluetooth action!:

It hasn't been easy, I'll grant you that. I get the impression d00616 probably does most of his work in Linux, and so some of the disconnect with the Windows IDE probably stems from that.

I can't change the way of Windows driver handling, but when there are Windows specific issues then they bust be fixed.

Mike_Lemo

@d00616 said in nRF5 Bluetooth action!:

@Mike_Lemo said in nRF5 Bluetooth action!:

Dunno that whole arduino BRF52832 programming thing seems too complicated just started to learn how to use the nordic SDK with eclipse until a proper solution is found.

The Nordic SDK is more complete than Arduino-nrf5 at the moment, but there is no compatibility with MySensors.

The good news, with SDK 13 the 'Nordic Semiconductor ASA' License was changed. The old ASA was the reason for me to rewrite the complete ESB protocol. Now the license is much less restrictive. I think now the way is open to integrate SDK code into arduino-nrf5 or provide SDK based arduino-libraries.

.

You mean way more complete every thing is accesable there and there is an example for everything and I didn't use my sensors anyways

d00616

@Mike_Lemo said in nRF5 Bluetooth action!:

You mean way more complete every thing is accesable there and there is an example for everything and I didn't use my sensors anyways

No. I mean if you want to use the Nordic MCU with BLE and you want to access the whole hardware without developing drivers, then the Nordic SDK is an option. For special requirements like tone() you have to develop your own routine for Arduino or SDK.

If you want write code which is compatible with other Vendors or want use MySensors then the SDK isn't the best choice.

The arduino-nrf5 targets to provide the Arduino language. I think this is mostly complete. MySensors brings additional support for enhanced pin output modes and the random number generator (no SoftDevice support here).

Accessing the internal MCU hardware must be added via Arduino libraries. With the new SDK license I think it's possible to put parts of the SDK into libraries supporting Hardware which is not specified in the Arduino reference.

If you want to develop BLE applications with portable code, there are open source implementations like http://mynewt.apache.org/ which are designed to be portable.

NeverDie

Good news! The hwCPUVoltage() function measures the Vcc voltage on the Ebyte module in millivolts. I'm able to send that as a barometer reading using the mocksensors sketch, and it arrives all the way into Domoticz, where it is logged and graphed. So, obviously I need to streamline that a bit, but the proof of concept works.

NeverDie

Quantization error on the hwCpuVoltage() function appears to about 14 millivolts, which is a nice little improvement over the atmega328p. Measurement accuracy appears to be well within those bounds.

Next step is to measure voltage on an analog pin using an AnalogRead. Not sure if the reference voltage is Vcc (as it typically is with the atmega328p) or something else for those measurements.

Toyman

Given new Arduino Primo contains a buzzer connected to nrf52, we might expect tone() function to be compatible with nrf52 very soon

https://www.arduino.cc/en/uploads/Main/ARDUINO_PRIMO-V022_SCH.pdf

NeverDie

@NeverDie said in nRF5 Bluetooth action!:

Quantization error on the hwCpuVoltage() function appears to about 14 millivolts, which is a nice little improvement over the atmega328p. Measurement accuracy appears to be well within those bounds.

Next step is to measure voltage on an analog pin using an AnalogRead. Not sure if the reference voltage is Vcc (as it typically is with the atmega328p) or something else for those measurements.

Strangely, if I do, say, analogRead(A4) on the nRF52832, all I get back is a 10-bit number, not a 12-bit number. i.e. the number never exceeds 1023. That can't be right. Should I be using a different function call to get the full 12 bits on the nRF52832?

mfalkvidd

@NeverDie looks like you need to call analogReadResolution first https://github.com/sandeepmistry/arduino-nRF5/blob/425e719af8d85b543def01e49a6ef4048525dc59/cores/nRF5/wiring_analog.h#L74

NeverDie

@mfalkvidd said in nRF5 Bluetooth action!:

@NeverDie looks like you need to call analogReadResolution first https://github.com/sandeepmistry/arduino-nRF5/blob/425e719af8d85b543def01e49a6ef4048525dc59/cores/nRF5/wiring_analog.h#L74

Thanks! That did the trick. Calling analogReadResolution(12) once in Setup() routine, I now get back a 12-bit number (i.e. up to 4095) thereafter when I do an analogRead(...).

NeverDie

So, just did the experiment, and here are the results. Supplying 3.3v to the Ebyte Module, a voltage of 3.0 volts on A4 yields an analogRead(A4) of 4095. Less voltage on A4 yields a lower number.

So, generalizing, I suspect that the reference voltage for analogRead() is Vcc-0.3.

So, you either know Vcc, because of a voltage regulator or something, or else you must call hwCpuVoltage() to get what it is. Then, subtract 0.3v from that, and that's the reference voltage which corresponds to an analogRead() return value of 4095.

NeverDie

I just did a quick and dirty measurement on the current consumption of the nRF52832 Ebyte module during sleep, and it measured 10 milliamps. I measured it using a uCurrent Gold. That's very high current for most battery powered applications. Can someone else here please measure it also and either confirm or refute?

I invoked sleep with this from the mocksensors sketch:

	wait(SLEEP_TIME); //sleep a bit

Perhaps there's a way to invoke a deeper sleep than that where less current is drawn?

rmtucker

@NeverDie
Try

sleep(60000); // Sleeps for a minute in deep sleep

NeverDie

@rmtucker said in nRF5 Bluetooth action!:

sleep(60000); // Sleeps for a minute in deep sleep

Thanks! That's a big improvement. I'm now reading 51uA. I did the measurements on the Ebyte nRF52832 module, powering it at 3.3v.

However, to be frank, that's still rather high compared to, say, an atmega328p with a RFM69 radio, which can have a combined sleep current of less than 1uA.

Is there anything more that can be done to lower the sleep current further?

rmtucker

@NeverDie

Is that a bare board with nothing connected (Not even serial)?

NeverDie

@rmtucker said in nRF5 Bluetooth action!:

@NeverDie

Is that a bare board with nothing connected (Not even serial)?

Yes. It's the bare Ebyte nRF52832 module. The only connections are Vcc and GND.

rmtucker

@NeverDie

Theoretically it should be around 1.9uA

NeverDie

Interestingly, I just now tried the same measurement with one of these nRF52832 modules instead of the Ebyte module:
https://www.aliexpress.com/item/nRF52832-Bluetooth-4-1-BLE-Module-M4-Transparent-Transmission-SMA-512K-FLASH-64K-RAM-pass-through/32798522093.html?spm=a2g0s.9042311.0.0.KKA3PF
and during sleep it measured 6uA. Quite a bit lower!

Anyone know of a module which tests even lower than that?

Nca78

@NeverDie said in nRF5 Bluetooth action!:

Interestingly, I just now tried the same measurement with one of these nRF52832 modules instead of the Ebyte module:
https://www.aliexpress.com/item/nRF52832-Bluetooth-4-1-BLE-Module-M4-Transparent-Transmission-SMA-512K-FLASH-64K-RAM-pass-through/32798522093.html?spm=a2g0s.9042311.0.0.KKA3PF
and during sleep it measured 6uA. Quite a bit lower!

Anyone know of a module which tests even lower than that?

Did you use the same board definition in the IDE and the same script ?

NeverDie

@Nca78 said in nRF5 Bluetooth action!:

Did you use the same board definition in the IDE and the same script ?

Yes.

rmtucker

@NeverDie
Have you tried sleep and wait for an external interrupt instead of sleep and wake on timer?
Just in case it is the lfxtl that is causing the problem.

NeverDie

@rmtucker said in nRF5 Bluetooth action!:

@NeverDie
Have you tried sleep and wait for an external interrupt instead of sleep and wake on timer?
Just in case it is the lfxtl that is causing the problem.

Haven't tried that yet. Is there a library functional call for that, or do I need to start addressing the registers directly? With this new mpu, I feel like I'm learning to walk all over again.

rmtucker

@NeverDie

Try

sleep(digitalPinToInterrupt(10), FALLING,0);

NeverDie

@rmtucker said in nRF5 Bluetooth action!:

@NeverDie

Try

sleep(digitalPinToInterrupt(10), FALLING,0);

Unexpected result: using that as the sleep invocation, the infor-link module measures at 14ua while sleeping. i.e. worse, not better, compared to the 6ua measured earlier.

NeverDie

Looks as though the infor-link is using an A620N crystal:

I tried to see if I could find a datasheet for it, in the hope of learning what its current consumption is (or, at least, should be). Unfortunately, though, I couldn't find a datasheet for an A620N.

NeverDie

Maybe it doesn't matter, because in looking at the actual module I received, it appears to use a different XTAL anyway: A649N.

NeverDie

Maybe from a current consumption standpoint, not using an external XTAL crystal, but rather relying on the nRF52832's internal resonator would draw less current? I know that's true for the atmega328p. If so, then that's a trade-off worth examining more carefully.

rmtucker

@NeverDie

Sorry i have been a little distracted because my waveshare BLE400 and jlink just turned up.
Took a little time to get it running but i loaded up the mockmysensors sketch with all the sensors un commented and pow all 30 odd sensors showed up in domoticz which made me chuckle.
Anyway post your sketch for the consumption testing and i will put it in and see if it works on my board.
The only problem is i can not unplug it from the Ble400 because i have no way of connecting wires to the core board because of the smaller pitch pins.

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