nrf51 chip not booting when bluetooth stack added

[ThinkTransit]

I have some bluetooth modules I got from aliexpress that have a NRF51822 chip inside.

Because they have different pins exposed to existing boards I have a custom board definition that defines the repl.

// UART config
#define MICROPY_HW_UART1_RX         (12)
#define MICROPY_HW_UART1_TX         (13)

When I build the firmware with the following command, everything works as expected, I can access the repl through pins 12/13

make BOARD_DIR=/home/patrick/esp/micropython-ia/ports/nrf/boards/IA-BEACON 

However when I download the BT stack and compile with

make BOARD_DIR=/home/patrick/esp/micropython-ia/ports/nrf/boards/IA-BEACON SD=s110

It get nothing on the serial pins.

Not sure if adding the SD param is interfering with my custom repl pins or it's just not booting for some other reason.

Any ideas? I'm using an STLINK and openocd to "halt" "program" "reset" if that makes a difference!

[andrewleech]

Double check the 32KHz crystal build settings, I ran into that in the past a fair bit on why the SD can cause lockups at boot.

[ThinkTransit]

Thanks Andrew any pointers where I can find the crystal build settings?

[andrewleech]

Try browsing the other boards files for a line like this I think (it's been years since I used a softdevice though so I'm not certain): https://github.com/micropython/micropython/blob/master/ports%2Fnrf%2Fboards%2FWT51822_S4AT%2Fmpconfigboard.mk#L7

The correct setting will depend on what clock sources your hardware has.

[ThinkTransit]

Thanks again I will dig into that!