Problem with applying format to serial communication

26 Feb 2019

Hello, I've developped simple program that send chars to serial port and can receive chars as well. It works fine until I change word length or parity or stop bits. And I need to set Odd parity because of project requirements. I've tried RealTerm, TerraTerm and CoolTerm. Every of them receiving random chars after changing that settings. I can successfully change baud rate. I'm working on STM32F746G-DISCO

could someone help? thanks in advance.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

  1. include "mbed.h"

DigitalOut myled(LED1); Serial pc(USBTX, USBRX); tx, rx Serial device(D1, D0); tx, rx

int i; char c[10],buffer[10];

void validator() {

myled = 1; LED is ON wait(0.2); 200 ms myled = 0; LED is OFF }

int main() { pc.baud(2400); pc.format(8,Serial::None,1); device.format(8,Serial::None,1); device.baud(2400); pc.printf("siema!\n"); while(1) { if(pc.readable()) { pc.gets(buffer,3); if (strcmp(buffer,"BK")==0) { pc.printf("bk\n"); } else { pc.printf("error\n"); } validator(); } if(device.readable()) { device.gets(buffer,3); if (strcmp(buffer,"BK")==0) { device.printf("bk\n"); } else { device.printf("error\n"); } validator(); } } }

27 Feb 2019

Bit of a long shot here but try setting the data length to 9. I have vague memories of a post from a few years ago about how some boards incorrectly counted the parity bits as part of the length.

Also when posting code if you use

<<code>>
your code here
<</code>>

then the formatting doesn't get messed up.

Please log in to post a reply.