The highest bit of the byte of the serial port receiving data of GD32F350 is found to be invalid

物联创客

The highest bit of the byte of the serial port receiving data of GD32F350 is found to be invalid [Copy link]

It was found that the highest bit of the byte received by the serial port of GD32F350 is invalid. That is, the serial port receives a byte and finds that the serial port prints out the received data as follows: Send to the microcontroller serial port: 0x01 Print out: 0x01, send to the microcontroller: 0x80 Print out: 0x00; send to the microcontroller: 0x81 Print out: 0x01; send to the microcontroller: 0x91 Print out: 0x11; send to the microcontroller: 0xa1 Print out: 0x21; send to the microcontroller: 0xb1 Print out: 0x31; that is, as long as the highest bit is 1, the reception will be regarded as no such problem. Have you ever encountered this problem? It is puzzling

chunyang

It should be a programming problem. You can write a simplest program first. After receiving the data, immediately send it back to the host computer through the serial port. Use the serial port debugging assistant software to test it in hexadecimal mode, sending only one byte at a time.

物联创客

chunyang posted on 2018-9-29 15:32 It should be a programming problem. You can first write a simple program to send the data back to the host computer through the serial port immediately after receiving it, and use the serial port debugging assistant software...

Yes, I found that there is a problem with the serial port receiving programming m6312_buf[m6312_cnt] = (usart_data_receive(EVAL_COM2) & 0x7f); This ox7f should be changed to 0xff. No wonder the highest bit is invalid, because I didn’t look carefully when transplanting other people’s programs!