Serial Timeout ERROR

[muhambykar]

Hi for all, I am trying to use this example, but I couldnt it successfully. I got Serial timeout error.( esp32 and stm32 could not talk successfully. ) I have tried everything, powered up stm32 and esp32 with different sources, erased stm32 flash memory with STMFlashLoader, changed up baudrate, or buttons and still got error. What could be the reason of this?
Thank you...

D (337256) : stm_flash (flashSTM:74) File name: /spiffs/blink.bin
I (337256) : stm_pro_mode (initGPIO:76) GPIO Initialized
I (337256) : stm_flash (flashSTM:83) Writing STM32 Memory
I (337256) : stm_flash (writeTask:7) Write Task
I (337256) : stm_pro_mode (resetSTM:81) Starting RESET Procedure
I (337856) : stm_pro_mode (resetSTM:88) Finished RESET Procedure
I (337856) : stm_pro_mode (cmdSync:114) SYNC
E (337896) : stm_pro_mode (sendBytes:231) Serial Timeout
I (337896) : stm_pro_mode (cmdGet:123) GET
E (337936) : stm_pro_mode (sendBytes:231) Serial Timeout
I (337936) : stm_pro_mode (cmdVersion:132) GET VERSION & READ PROTECTION STATUS
E (337976) : stm_pro_mode (sendBytes:231) Serial Timeout
I (337976) : stm_pro_mode (cmdId:141) CHECK ID
E (338016) : stm_pro_mode (sendBytes:231) Serial Timeout
I (338016) : stm_pro_mode (cmdErase:149) ERASE MEMORY
E (338056) : stm_pro_mode (sendBytes:231) Serial Timeout
I (338056) : stm_pro_mode (cmdExtErase:166) EXTENDED ERASE MEMORY
E (338096) : stm_pro_mode (sendBytes:231) Serial Timeout
I (338106) : stm_flash (writeTask:19) Writing block: 1
I (338106) : stm_pro_mode (flashPage:279) Flashing Page
I (338106) : stm_pro_mode (cmdWrite:183) WRITE MEMORY
E (338146) : stm_pro_mode (sendBytes:231) Serial Timeout
E (338186) : stm_pro_mode (sendBytes:231) Serial Timeout
E (338496) : stm_pro_mode (flashPage:318) Serial Timeout
I (338496) : stm_flash (flashSTM:92) STM32 Flashed Successfully!!!
I (338496) : stm_flash (flashSTM:95) Ending Connection
I (338496) : stm_pro_mode (resetSTM:81) Starting RESET Procedure
I (339096) : stm_pro_mode (resetSTM:88) Finished RESET Procedure
I (339096) : stm_pro_mode (endConn:98) Ending Connection
I (339096) : stm_flash (flashSTM:98) Closing file
E (339096) : FILE_SERVER_HTTP (flash_post_handler:445) Target flashing failed

[muhambykar]

Is there anyone got same error?

[laukik-hase]

Hello, @muhambykar

Can you check the GPIOs that you are using as Rx and Tx?

[muhambykar]

I have checked rx tx pins, I can write and erase with these pins on FlashLoaderDemo.exe but I couldnt it with esp32. I have tried directly Boot0 to HIGH, and I have also tried with #define BOOT0_PIN (GPIO_NUM_21) But got some error log. Is there anything that I can check?

[muhambykar]

Is there anybody got same error?

[laukik-hase]

Hello, @muhambykar
Sorry for the late reply.

1. Test this example for UART - UART Async Tasks
2. Verify whether your STM32 is in BOOT mode before flashing.
3. Try resetting your STM32 using the RESET switch on your board, and then running the example. (Time it appropriately)

[LetsControltheController]

Hello there, I found the solution. on ESP-IDF v4.0.x ,
uart_set_rts(UART_CONTROLLER, 1);
this function changes the uart configs, and got trouble about it. After make comment it, problem is solved. This line is on components/stm_pro_mode/stm_pro_mode.c Line: 19

I have listened the received packets from UART, then I figure out it and it works. I recommend it.

[laukik-hase]

Hello there, I found the solution. on ESP-IDF v4.0.x ,
uart_set_rts(UART_CONTROLLER, 1);
this function changes the uart configs, and got trouble about it. After make comment it, problem is solved. This line is on components/stm_pro_mode/stm_pro_mode.c Line: 19

I have listened the received packets from UART, then I figure out it and it works. I recommend it.

This function was inserted as the STM32 flashing protocol works on USART, not UART. We have tested with two different versions of the chip (STM32F103 and STM32F072) and got successful results. Can you guys tell which STM32 chip are you using?

[LetsControltheController]

Its not about STM32, its about ESP32. When we configure RTS manually iwth this function, ESP32 could not read data on Rx pin. So if we leave it with automatic configuration, it works.

[laukik-hase]

@muhambykar I am closing the issue for now. Reopen it if you have any updates regarding the problem.

[madhavee77]

Hey I am getting the same error and tried everything mentioned above. Was someone able to solve it?

[akym]

I have the same issue, i tried all the solutions mentioned in this issue and then some more. Cant seem to point out why esp32 cant receive anything, even tried the uart_set_rts solution mentioned by @LetsControltheController . The UART example works but only when talking with STM it doesn't work. Any thoughts on the problem?

[laukik-hase]

Hello,

Sorry for the late response. I will try reproducing this on my side and revert back to you.

@akym and @madhavee77 Could you guys specify the following:

1. ESP-IDF Version (use git describe --tags to find out)
2. STM32 MCU (e.g. STM32F103, STM32F401, STM32F072, etc.)

[akym]

Hi,
Thank you for the quick response. Here are the things you requested:
1.ESP-IDF 4.3
2. STM32F407 from DISC1 board

I probed Tx,Rx of the STM32 with oscilloscope and it is transmitting some data on the Tx but ESP32 doesnt read any of that data. I have tried running the UART example as you suggested and that one works fine on UART0 and UART2. For my implementation I am using UART2 to push firmware to the STM.
here the red channel is Tx and yellow is Rx

Any help will be appreciated.

My code for reference:

stmOTA.zip