Hello.
I am using the STM32F030 for a sensor with a RS485 interface.
In my tests, I am sending a 8-bits message (constant value) to the STM32 in a loop. When I look at the data received, the last byte is at the first place, always. There is never any other or additional shift.
I can understand it is byte remaining from the previous comm and missed out from the previous reading but why is it so stable (always one byte and always the correct one).
Any idea about the reason of this ? And more usefull, do you have any method to clear the DMA buffer before starting reading ? Would you recommand the use of a circular buffer for the DMA ?
On one side (transmitter)
message_TX[0] = 0x02; ...; message_TX[6]= 0xDE ; message_TX[7] = 0xAC;
HAL_UART_Transmit_DMA(&huart1, (uint8_t*)message_TX, 8);
On the other side (receiver)
HAL_UART_Receive_DMA(&huart1, (uint8_t *)message_RX , 8);
And I get the following data in message_RX[0] = 0xAC (always) and message_RX[7] =0xDE (always)
Any suggestion for me ?
