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Understanding UART Overrun Error When Sending AT Commands from STM32 to ESP8266

Iā€™m interfacing an ESP8266 with an NUCLEO-L073RZ using UART1 `PA9`, `PA10` for communication with the ESP and UART2 for communication with a PC for debugging. I also used a CP2102 USB to TTL converter to tap the Tx signal from UART1 and monitor AT commands sent from the STM32

The STM32 sends the first AT command correctly, but when I send the second command `AT+RST`, only part of it is received by the ESP8266. After debugging, I found that `HAL_UART_Transmit` returns `HAL_ERROR`, and the cause seems to be an overrun error.
See how I set things up:

_Baud rate : 115200 for both STM32 and ESP8266

_Buffer size: 256 bytes

_Communication method: Polling for UART communication

_Power supply: 5V regulated power source for ESP8266

Using `HAL_MAX_DELAY` as the timeout fixed the issue, but Iā€™m unsure why. Increasing the delay in `HAL_Delay()` didnā€™t resolve the issue, so Iā€™m still confused about whatā€™s causing the overrun error.

Hereā€™s the code Iā€™m using to send AT commands;

  1. Edison_ngunjiri#0000

    Hi,please consider using 3.3v power supply.
    Then,you can turn off reply feature or else wait until you get the reply before you send another command.
    Also you can try to increase the 100ms /use HAL_MAX_DELAY as timeout.
    Let me know if these options works for you

  2. Sterling#0000

    I will get back to you on this @edison_ngunjiri_94786 … Bless šŸ™šŸ½

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