Issue with Receiving Structured Data via UART Callback on STM32

Question

Hello, 
 I'm working with two different STM32 microcontrollers: 
 
 Sender: STM32F4CCUx 
 Receiver: STM32F4VET6 
 
 I am sending a packet (which is a structure of size 4) from the sender to the receiver using UART, with both microcontrollers utilizing the UART callback function for transmission and reception. 
 Here is the process I&rsquo;m following: 
 
 The sender sends a packet using HAL_UART_Transmit_IT . 
 The receiver is configured with HAL_UART_Receive_IT . 
 Both microcontrollers handle data in their respective callback functions. 
 
 However, on the receiving side, the data is either jumbled or incorrect. 
 Details: 
 
 The packet is a structured type with multiple fields. 
 I&rsquo;ve ensured that the baud rate and UART configurations match on both microcontrollers. 
 The callback functions seem to be triggering correctly.

shabaz · Answer

There are a lot of useful examples (google ' STM32 UART interrupt receive example '). 
 It would be best to start with one of those examples, so that you have known working code. 
 Some of those examples are precisely for the situation where the length of the received data is unknown, i.e. you will be able to view data in a buffer and process it once your code determines a complete set of data has arrived (it is up to your code to decide on that). 
 Start with one of the examples, and that will confirm to you that the sender side data is successfully being received correctly. Without that, it's like a stab in the dark. 
 Then, code your algorithm to determine when the received data is sufficient to process as a complete message.

Issue with Receiving Structured Data via UART Callback on STM32

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