Blackmagic Probe for ARM running on esp32 hardware

Based on the ESP8266 black magic port, only provides SWD ARM Cortex-M Debug Interface

It provides a wifi based, debug probe for ARM i.e. ST32L1 cortex processors https://github.com/markrages/blackmagic/tree/a1d5386ce43189f0ac23300bea9b4d9f26869ffb/src/platforms/esp8266

Up to date BMP

This repository is not updated with latest changes in BMP This other repository contains the latest version of BMP source https://github.com/Ebiroll/blackmagic

In order to build this repository in linux, do.

      > . ~/esp/esp-idf/setup.sh
      > cd src/platforms/esp32
      #Check the platform.h files amd make sure that the pins are OK.
      # check main.c for password and SSID of your wifi
      #Run build script.
      > build-esp32.sh
      #Upload the

Status

Now it seems to work, I use the RAK811 target. The pins are defined here, http://docs.rakwireless.com/en/RAK811%20TrackerBoard/Software%20Development/RAK811%20TrackerBoard%20User%20manual%20V1.1.pdf

This is the debug compiled source code I use, https://github.com/Ebiroll/RAK811_BreakBoard

So

GND on ESP32 connects to GND on the RAK board, opposite to the boot pins
PIN 23 on ESP32 connects to SWD_CLK
PIN 17 on ESP32 connects to SWD_TMS

Pins are changed in platform.h

I (3119) event: sta ip: 192.168.1.117, mask: 255.255.255.0, gw: 192.168.1.1
I (3119) blackmagic: Connected to AP
I (3119) gpio: GPIO[17]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 
I (3129) gpio: GPIO[23]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 

Start the debugger,

arm-none-eabi-gdb .pioenvs/rak811/firmware.elf

target  extended-remote 192.168.1.125:2345

(gdb) monitor help

(gdb) monitor swdp_scan
Target voltage: not supported
Available Targets:
No. Att Driver
 1      STM32L1x

https://github.com/blacksphere/blackmagic/wiki/Frequently-Asked-Questions

(gdb) attach 1

Works like charm.

Trace SWO

It is possible to use trace swo if you configure it to use UART mode and 115200. You must also define thses in platform.h.

#define PLATFORM_HAS_TRACESWO 1
#define TRACESWO_PIN 13
// Workaround for driver
#define TRACESWO_DUMMY_TX 19

Note that the debugger needs to be attached in order to get output on the serial device. Here is an example of how to set up the swo for UART mode trace, https://github.com/Ebiroll/beer_tracker/blob/master/RAK811-Tracker/src/swo.c Add this,

#define CPU_CORE_FREQUENCY_HZ 16000000 /* CPU core frequency in Hz 32Mhz */
   SWO_Init(0x1, CPU_CORE_FREQUENCY_HZ);

Here are some more useful information ow what is possible. https://github.com/orbcode/orbuculum

To start trace thead, do

(gdb) monitor traceswo

Quicker download

arm-none-eabi-gdb .pioenvs/rak811/firmware.elf -ex 'target  extended-remote 192.168.1.136:2345'

(gdb) monitor swdp_scan
(gdb) attach 1
(gdb) load
(gdb) b main
(gdb) c