scanlime/esp8266-arm-swd

Proof-of-concept ESP8266 web server and ARM Serial Wire Debug client

esp8266-arm-swd's Issues

Flashing K20 (Teensy 3.1) MCU using your code

Hi,

thank you very much for making this public. I have built a custom Teensy reference board and wrote about it in my blog (http://www.appfruits.com/2015/03/building-your-own-custom-teensy/). While I actually really love the Teensy I would like to build a board without the boot loader MCU.

What I want to build is an ESP8266 which is able to download a firmware for the K20 MCU and flash it with SWD. I found your code which looks like to actually do that, but I don't get it working.

I am not sure which init function (there are a few like startup, begin, init) I need to use to get the K20 in the correct state. When beginning flashing I receive error message that flash is not ready for mass erasing. When I add a few delays I sometimes get an AP polling error.

Any help would be appreciated.

Thanks,
Phillip

Errors flashing STM32 using ARMDebug

Hello,

first of all: Thank you for this project! It has helped me a lot on my first deepdive into the world of microcontrollers.

I am trying to flash an STM32 ARM microcontroller from an ESP32 and your ARMDebug Class has gotten me quite far.
I can connect, unlock the flash, mass erase and I can programm individual parts of the flash.
But when I try to write a whole 32KB of Firmware the flash process fails after a while and I have not found a way to recover from that.

I was hoping that maybe you could give me a hint what I should be looking for in the documentation or to debug the code, even though this is not about the MC you are using in your project.

This is the main loop that writes to the flash:

  for (size_t i = 0; i < bufferSize; i +=4) {
    waitbusy();
    writePG1();
    uint32_t data = *((uint32_t*)(buffer + i));
    Serial.println(String(i) + " writing: 0x" + String(FLASH_OFFSET + i, HEX)+":0x"+String(data, HEX));
    memStore(FLASH_OFFSET + i, data);
    waitbusy();
    uint32_t temp;
    memLoad(FLASH_OFFSET + i, temp);
    if(temp!=data){
      handleFault();
      Serial.println(String(i) + " verify failed. expected: 0x" + String(data, HEX) + " read: " + String(temp,HEX) + " retrying");
      i-=4;
    }
  }

in the beginning the write and verify succeeds. After ~2000 operations I am occasionally getting parity errors:
PARITY ERROR during read (addr=0 APnDP=1 data=63000052)
ARMDebug: Error while waiting for memory port

those seem to be resolved by the retry mechanism.

But shortly after (~2500 operations in) I am endlessly getting errors like:
PROTOCOL ERROR response during read (ack=3 addr=c APnDP=0)
ARMDebug: Error while waiting for memory port

Retrying obviously does not solve the issue the STM has at that point.

Do you have any idea how I can find out whats blocking the flash operations at this point and how it can be resolved?

Best regards

Ier