UART DMA Transmitter and receiver issue

[NSing.5]

i'm using STM32F730 as uart receiver and STM32f0 as uart transmitter baud rate 9600, 8 bit data representation. i'm using DMA with interrupt for the communication. i'm using HAL for programming on IAR workbench.

The transmitter is continuously transmitting 20 bytes after a delay of 1 sec. i'm facing following issue:

1. The receiver gets interrupted only once and after wards it is not getting interrupted.
2. i've reused "HAL_UARTEx_ReceiveToIdle_DMA(&huart1,Rxr,20);" in interrupt callback function "HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)".

[Javier1 · Accepted solution]

>>The receiver gets interrupted only once and after wards it is not getting interrupted.

Receiving buffer overflow?

[NSing.5]

thanks a lot for your input, it was the overflow flag causing problem in the reception. plz tell me how i can clear it in the program.

i've one more question related to transmission using DMA. i'm facing a strange situation.

1. it works perfectly when i use "HAL_UART_Transmit_DMA(&huart1, TxBuf, 5);" in the main program.
2. However in my project i've crated a separate file for my application program, which i include in the main program, and when i call "HAL_UART_Transmit_DMA(&huart1, TxBuf, 5);" from my application program, only first two bytes are transferred as per my data rest all bytes are corrupted.

Regards