@alowhum

Hi I managed to clear the access protection.

I connected ebyte module directly to raspberry pi.

I used this guide http://hivetool.org/w/index.php?title=BMD301 with little modifications

Compiled openocd - current version - 7b94ae9e520877e7f2341b48b3bd0c0d1ca8a14b

Added chip definition - I don't know if it is needed, I can check that - I have more modules to unlock

diff --git a/src/flash/nor/nrf5.c b/src/flash/nor/nrf5.c
index 31dd5aae..e01d7ddf 100644
--- a/src/flash/nor/nrf5.c
+++ b/src/flash/nor/nrf5.c
@@ -204,6 +204,7 @@ static const struct nrf5_device_spec nrf5_known_devices_table[] = {

 	/* nRF52832 Devices */
 	NRF5_DEVICE_DEF(0x00C7, "52832", "QFAA", "B0",    512),
+	NRF5_DEVICE_DEF(0x00C7, "52832", "QFN48", "B00",    512),
 };

 static int nrf5_bank_is_probed(struct flash_bank *bank)

Started openocd:

openocd -f interface/raspberrypi-native.cfg -c "transport select swd; set WORKAREASIZE 0" -f target/nrf52.cfg

Connected with telnet to port 4444
Commands:

nrf52.dap apreg 1 0x0c
nrf52.dap apreg 1 0x04 0x01
reset

I tried also with st-link but I think it doesn't support dap commands? Can anyone confirm that?

After clearing access protection I am able to successfully flash chip with st-link.
Now it shows in logs:
Info : nrf52.cpu: hardware has 6 breakpoints, 4 watchpoints
Before it was:
Info : nrf52.cpu: hardware has 0 breakpoints, 2 watchpoints

Good luck with unlocking your modules:)

@alowhum

Hi I managed to clear the access protection.

I connected ebyte module directly to raspberry pi.

I used this guide http://hivetool.org/w/index.php?title=BMD301 with little modifications

Compiled openocd - current version - 7b94ae9e520877e7f2341b48b3bd0c0d1ca8a14b

Added chip definition - I don't know if it is needed, I can check that - I have more modules to unlock

diff --git a/src/flash/nor/nrf5.c b/src/flash/nor/nrf5.c
index 31dd5aae..e01d7ddf 100644
--- a/src/flash/nor/nrf5.c
+++ b/src/flash/nor/nrf5.c
@@ -204,6 +204,7 @@ static const struct nrf5_device_spec nrf5_known_devices_table[] = {

 	/* nRF52832 Devices */
 	NRF5_DEVICE_DEF(0x00C7, "52832", "QFAA", "B0",    512),
+	NRF5_DEVICE_DEF(0x00C7, "52832", "QFN48", "B00",    512),
 };

 static int nrf5_bank_is_probed(struct flash_bank *bank)

Started openocd:

openocd -f interface/raspberrypi-native.cfg -c "transport select swd; set WORKAREASIZE 0" -f target/nrf52.cfg

Connected with telnet to port 4444
Commands:

nrf52.dap apreg 1 0x0c
nrf52.dap apreg 1 0x04 0x01
reset

I tried also with st-link but I think it doesn't support dap commands? Can anyone confirm that?

After clearing access protection I am able to successfully flash chip with st-link.
Now it shows in logs:
Info : nrf52.cpu: hardware has 6 breakpoints, 4 watchpoints
Before it was:
Info : nrf52.cpu: hardware has 0 breakpoints, 2 watchpoints

Good luck with unlocking your modules:)

I have the same problem with brand news ebyte modeules.

Here are my openocd logs:

Open On-Chip Debugger 0.10.0-dev-gdc53227 (2016-04-09-13:45)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 2
0x4000
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
adapter speed: 10000 kHz
Info : Unable to match requested speed 10000 kHz, using 4000 kHz
Info : Unable to match requested speed 10000 kHz, using 4000 kHz
Info : clock speed 4000 kHz
Info : STLINK v2 JTAG v17 API v2 SWIM v4 VID 0x0483 PID 0x3748
Info : using stlink api v2
Info : Target voltage: 3.241270
Info : nrf52.cpu: hardware has 0 breakpoints, 2 watchpoints
Error: timed out while waiting for target halted
TARGET: nrf52.cpu - Not halted
in procedure 'program'
in procedure 'reset' called at file "embedded:startup.tcl", line 478
in procedure 'ocd_bouncer'

embedded:startup.tcl:454: Error: ** Unable to reset target **
in procedure 'program'
in procedure 'program_error' called at file "embedded:startup.tcl", line 479
at file "embedded:startup.tcl", line 454
wybrany port szeregowy at file "embedded:startup.tcl", line 454
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