Transmitting data:
#define TX_LENGTH (16)
uint8_t tx_buffer[TX_LENGTH];
/* Write data */
tx_buffer[0] = 0x0;
tx_buffer[1] = 0x1;
/* Clean D-cache */
/* Make sure the address is 32-byte aligned and add 32-bytes to length, in case it overlaps cacheline */
SCB_CleanDCache_by_Addr((uint32_t*)(((uint32_t)tx_buffer) & ~(uint32_t)0x1F), TX_LENGTH+32);
/* Start DMA transfer */
HAL_UART_Transmit_DMA(&huart1, tx_buffer, TX_LENGTH);
Receiving data:
#define RX_LENGTH (16)
uint8_t rx_buffer[RX_LENGTH];
/* Invalidate D-cache before reception */
/* Make sure the address is 32-byte aligned and add 32-bytes to length, in case it overlaps cacheline */
SCB_InvalidateDCache_by_Addr((uint32_t*)(((uint32_t)rx_buffer) & ~(uint32_t)0x1F), RX_LENGTH+32);
/* Start DMA transfer */
HAL_UART_Receive_DMA(&huart1, rx_buffer, RX_LENGTH);
/* No access to rx_buffer should be made before DMA transfer is completed */
单收单发可以，同时收发数据出错
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