Print Debugging
The easiest way to debug is by adding print statements into the CircuitPython C code and viewing the output over UART. UART is a serial connection that is available earlier than serial over USB and tends to be more reliable as well.
#include "runtime.h" ... // Acts like printf. mp_printf(&mp_plat_print, "hello %d\n", 10);
The broadcom builds have the DEBUG UART enabled by default on the default RX and TX pins in the 40 pin header. Connect a USB to Serial converter to view the debug output.
One can also send serial input to CircuitPython over this connection.
GDB
It is also possible to connect to the CPUs over GDB via openocd. See the GDB guide for installation and usage details.
The broadcom-peripherals library includes configuration files for openocd. Here is an example command to run from ports/broadcom from within the CircuitPython repo that uses a JLink to talk to the Pi.
openocd -d -f interface/jlink.cfg -f peripherals/openocd/bcm2835.cfg
Then, within GDB do this to connect to OpenOCD:
tar ext :3333
Page last edited March 08, 2024
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