STM32F405 chip USART 2M baud DMA received and sent data lost
I use board A: STM32H743VIT6, HAL library development, version v1.9.0 HSE = 20M, main frequency 480M serial port 1 enabled, DMA send, IDLE + DMA receive data. Send using 1ms timer for DMA serial send, send interval 1ms, send data length 18 bytes. Board B: STM32F405RGT6, HAL library development, version v1.27.0 HSE = 8M, main frequency 168M serial port 2 enabled, DMA send, IDLE + DMA receive data. Data send using 1ms timer, 10ms interval through DMA send data, send data length 18 bytes. Connect board A's Tx - board B's Rx. Board A's Rx - board B's Tx. Problem: H7 board data send normal, statistics within 1s, the theory should send 1000*18 = 18000 bytes, the actual received 18000 bytes. But F4 board data received less than 18000 bytes, send data also lost bytes. IDLE interrupt without time-consuming operation, only the length of the data received accumulated, and then exit. I use board A: STM32H743VIT6, HAL library development, version v1.9.0 HSE = 20M, main frequency 480M serial port 1 enabled, DMA send, IDLE + DMA receive data. Send using 1ms timer for DMA serial send, send interval 1ms, send data length 18 bytes. Board B: STM32F405RGT6, HAL library development, version v1.27.0 HSE = 8M, main frequency 168M serial port 2 enabled, DMA send, IDLE + DMA receive data. Data send using 1ms timer, 10ms interval through DMA send data, send data length 18 bytes. Connect board A's Tx - board B's Rx. Rx of board A - Tx of board B. Problem: H7 board data transmission is normal, statistics within 1s, the theory should send 1000*18=18000 bytes, the actual received 18000 bytes. But F4 board data received less than 18000 bytes, the transmitted data also lost bytes. IDLE interrupt has no time-consuming operation, only accumulates the length of the received data, and then exits.
