DMA Ringbuffer UART circular mode

[Brian Dahl]

Posted on February 25, 2018 at 21:27

Hi,

i have a ringbuffer, for example an 2d Array of fixed uint8_t Bytes. It's possible that the chip at self or triggered in the Callback can update the DMA buffer address????

For example:

#define lines 8
#define bufferlinesize 36
uint8_t rxBuffer[lines][bufferlinesize]
unsigned nItrWrite=0;
.
.
.
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
nItrWrite= (nItrWrite+ 1) % lines;
huart->pRxBuffPtr = rxBuffer[nItrWriteRing];
}�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?

#uart-dma #stm32-l4

[Tilen MAJERLE]

Posted on February 26, 2018 at 21:20

Hello

bd

‌,

once you have RxColtCallback event, you have to start DMA read again.

HAL drivers currently don't support circular receive data over DMA.

Best regards,

Tilen

[Vitaliy Chernobay]

Posted on February 27, 2018 at 08:45

Hi,

Tilen MAJERLE

Why 

HAL drivers currently don't support circular receive data over DMA?

[Andrew Neil]

Posted on February 27, 2018 at 10:32

i have a ringbuffer, for example an 2d Array

Why would a Ring buffer be a 2D array ??