Downloading, Building and Deploying the Firmware

Discussion and questions about boards that can run MicroPython but don't have a dedicated forum.
Target audience: Everyone interested in running MicroPython on other hardware.
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dhylands
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Re: Downloading, Building and Deploying the Firmware

Postby dhylands » Sun Feb 26, 2017 2:56 am

It looks like the bootloader expects a CRC32 checksum to be stored in the image and MicroPython doesn't have one, which explains why it thinks its invalid.

You'd need to put something into the build to calculate that checksum and store it in the image.,

SureshVakati
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Joined: Fri Feb 24, 2017 3:52 pm

Re: Downloading, Building and Deploying the Firmware

Postby SureshVakati » Tue Feb 28, 2017 7:17 pm

Hello Dave,
I got it working! Thank you!
Last edited by SureshVakati on Wed Mar 01, 2017 10:59 pm, edited 1 time in total.

huiyifach6
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Re: Downloading, Building and Deploying the Firmware

Postby huiyifach6 » Sat Mar 04, 2017 6:29 am

I also followed what you said above.











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SureshVakati
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Joined: Fri Feb 24, 2017 3:52 pm

Re: Downloading, Building and Deploying the Firmware

Postby SureshVakati » Tue Mar 14, 2017 7:32 pm

Hello Dave,
Is there anyway that I can write a magic value to SRAM? I am trying to do OTA for STM32f405, I had methods to download the firmware and bootloader has code to update the firmware, now the bootloader checks for a magic value in SRAM, if it is there then it will do the update process. Can I write magic values like below from micropython?This is in 'C'

Code: Select all

*((DWORD *)0x2001FFFC) = 0xCAFE0001; // Write Magic value to SRAM
NVIC_SystemReset();

Bootloader checks that value while booting.

Code: Select all

 if (BootState == 0xCAFE0001)
    AppErase(APPLICATION_BASE);

  if (ApplicationFirmwareCheck() && !BreakKeyCheck())
  {
    printf("Application Valid\n");

    while(USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET); /* Wait for characters to leave */

    USART_Cmd(USART3, DISABLE);  /* Disable the USART3 */

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, DISABLE); /* Disable USART3 Clock */

    Reboot_Application(); // Does not return
  }
  else
  {
    printf("Application Missing or Corrupt\n");

    test(); // DFU Burner
  }

Writing the value to a file in SD card is another alternative, but this code is already tested and been working fine, so just thinking to keep everything as same in my project.

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dhylands
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Re: Downloading, Building and Deploying the Firmware

Postby dhylands » Wed Mar 15, 2017 12:27 am

SureshVakati wrote:Hello Dave,
Is there anyway that I can write a magic value to SRAM? I am trying to do OTA for STM32f405, I had methods to download the firmware and bootloader has code to update the firmware, now the bootloader checks for a magic value in SRAM, if it is there then it will do the update process. Can I write magic values like below from micropython?This is in 'C'

Code: Select all

*((DWORD *)0x2001FFFC) = 0xCAFE0001; // Write Magic value to SRAM
NVIC_SystemReset();


In MicroPython, the equivalent of those 2 lines would be:

Code: Select all

import machine
import stm

stm.mem32[0x2001FFFC] = 0xCAFE0001
machine.reset()
Note: pyb.hard_reset() is the same thing as machine.reset()


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