Data Buffer for serial and spi

[MacLaren]

hi hope have good day

i need to buffer data for save on every 1ms

for serial and spi i use dma to receive data

for example hal_uart_receviveDMA on this function must set buffer size ...

i test one example :

50Hz send to mcu data each time 1000 and 1001 and 1002... to full load data and baud 921600

1khz buffering(hal_uart_rec_dma) in 2000 length variable.

but i have some problem

in first time on the dma interrupt 1000 was ok second form 1000 to 2000 data add and 1 data lost and lost increase every 2 time buffer full

how can i find how many data receive for copy on other buffer and how can i receive without lost

thanks

[waclawek.jan]

For high data rate, use circular DMA.

JW

[KnarfB]

Here is a pretty nice tutorial: https://stm32f4-discovery.net/2017/07/stm32-tutorial-efficiently-receive-uart-data-using-dma/

[MacLaren]

thanks for reply

i use circular DMA and it work just for test board that is f1 not H7

now in H7 its a few complex

i do this change but i cant see any data in Buffer

ALIGN_32BYTES (uint8_t U1RxBuff[1000]);
ALIGN_32BYTES (uint8_t U2RxBuff[1000]);
ALIGN_32BYTES (uint8_t U3RxBuff[1000]);
ALIGN_32BYTES (uint8_t U4RxBuff[1000]);
ALIGN_32BYTES (uint8_t U5RxBuff[1000]);
int main(void)
{
  SCB_EnableICache();
  SCB_EnableDCache();
 
//some thing
   MX_GPIO_Init();
  MX_DMA_Init();
  MX_UART4_Init();
  MX_UART5_Init();
  MX_UART7_Init();
  MX_UART8_Init();
  MX_USART1_UART_Init();
 
//some thing
 
			SCB_InvalidateDCache_by_Addr ((uint32_t *) U1RxBuff, 1000);
			SCB_InvalidateDCache_by_Addr ((uint32_t *) U2RxBuff, 1000);
			SCB_InvalidateDCache_by_Addr ((uint32_t *) U3RxBuff, 1000);
			SCB_InvalidateDCache_by_Addr ((uint32_t *) U4RxBuff, 1000);
			SCB_InvalidateDCache_by_Addr ((uint32_t *) U5RxBuff, 1000);
			HAL_UART_Receive_DMA(&huart1, U1RxBuff, 1000);
			HAL_UART_Receive_DMA(&huart7, U2RxBuff, 1000);
			HAL_UART_Receive_DMA(&huart8, U3RxBuff, 1000);
			HAL_UART_Receive_DMA(&huart4, U4RxBuff, 1000);
			HAL_UART_Receive_DMA(&huart5, U5RxBuff, 1000);
 
//some thing
}
static void MX_DMA_Init(void) 
{
 
  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();
 
  /* DMA interrupt init */
  /* DMA1_Stream0_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);
  /* DMA1_Stream1_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream1_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn);
  /* DMA1_Stream2_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream2_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream2_IRQn);
  /* DMA1_Stream3_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream3_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream3_IRQn);
  /* DMA1_Stream4_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream4_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream4_IRQn);
 
}

i cant see interrupt for dma in hal...it.c

 data stream from source is continue send and i must save all of them

baud rate is 921600 and full load

[MacLaren]

i test lot of solution such as this link https://community.st.com/s/article/FAQ-DMA-is-not-working-on-STM32H7-devices?t=1580438940317

and template in cube mx folder for H7 uart dma but yet i cant receive correct data

i use cube ide

[waclawek.jan]

So, you first said:

> form 1000 to 2000 data add and 1 data lost

and then

> i do this change but i cant see any data in Buffer

So what is it, no data or 1 data point out of 1000 missing?

Read out and check the relevant DMA, DMAMUX and UART registers content.

JW

[MacLaren]

yes

i mention to that

at first i just use f1 ev borad for test (with your answer that work )

but at last in h7 borad I didn't get the previous answer(no data or 1 data)

[MacLaren]

my question is that why st cube mx example not correct receive uart ?

[waclawek.jan]

Well, I don't know and I don't care, I don't use CubeMX and I don't use 'H7.

The chip doesn't care about CubeMX either, it works out of its settings. That's why you should look at the registers.

JW

[MacLaren]

i have some change and now i can see data in buffer

but have new problem

in circular dma mode data continuously received but lot of data wrong

in normal mode i can just one time correct frame and stop receive data