OTA for STM32 using GSM-GPRS module about 1chip-programmers

[csnol]

Hi Sankaramp,

I don't know which module you used for. and I was only use AT command on Arduino Uno + SIM8xx series GSM-GPRS module.
I think it is difficult If you wanna only use ONE GSM-GPRS module to flash STM32 without a Ext-MCU.
you know, We need 4 GPIO pins at least and 100KB data space( to save STM32 bin file)

* 2 GPIOs for STM32's BOOT0 and RESET.
* 2 GPIOs as a  EVEN Serial port to communicate with STM32.

As far as I know, Only a GSM-GPRS module can't do it if not been hacked.

You have to add a MCU which it has 2 UARTs. one Serial control GSM-GPRS module to connect internet. other Serial to flash STM32.

Haha, only if you use it for WiFi-Less or long distance control, I really don't suggest it .

[sankaramp]

hello csnol,
thanx for reply,

according to your suggestion i changed my application like this.

in this, i just want to connect one GSM-GRPS module through UART2 of MCU1.
from GSM i want to read " example.bin " file through OTA and store that in external SPI-FLASH memory.

when expernal SPI FLASH got new ".bin file",it should load to MCU2 through UART1 of MCU1.

NOTE: here MCU1 and MCU2 both are STM32f1series controllers.

could you please give some suggestions.

thanq,
Sankar

[csnol]

Yes， Maybe you need pull-up GPIO1 and GPIO2.

Sorry, I don't know how to code a HTTP server use AT commands.

Attention please, "double MCUs, half stabilities."

[sankaramp]

Okay thanq

I just need one help in writing the code regarding "load the .bin file from spi flash to MCU2 through UART1".

Any suggestion will be helpful..

Regards,
Sankar

[csnol]

You can try the LowPowerLab/SPIflash library

https://github.com/LowPowerLab/SPIFlash

or search Winbondflash in Github.

For flash STM32 MCUs, please reference STM32 DS file and my codes. some functions be included in stm32ota.h and stm32ota.cpp

[sankaramp]

hello sir,

i'm trying like this,"in application programming using SD card".
is it possible?
ref: https://github.com/akospasztor/stm32-bootloader
https://www.st.com/content/ccc/resource/technical/document/application_note/group0/6b/6d/66/98/7d/3e/46/cc/DM00282546/files/DM00282546.pdf/jcr:content/translations/en.DM00282546.pdf

any suggestions plz

thanq
Sankar

[ambujsaxena1]

HI csnol,

This is very good library, I want to use this library with STM32F303 Controller, But as you mention that this will work only on 32 pin controller but my controller 100 Pin controller. anyways I tried by whenever ESP send 7F command to init the communication it will reviced
0x00 in sbuf[0]

Could you tell help to resolve this issue. Should we have to code STM too ?