UART initialisation is incorrect - Raspberry Pi Forums

as can see on attached oscilogram

bad_init.jpg (11.69 kib) viewed 716 times

- here problem @ initialisation(exactly @ open) /marked red ellipse/ stage of rpi uart - it's trigger tx state lead many communication issues.

code: select all

#include <stdio.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> #include <termios.h>  int main(int argc, char ** argv) {   int fd;   fd = open("/dev/ttyama0", o_rdwr | o_noctty | o_ndelay);   fcntl(fd, f_setfl, fndelay);   int n = write(fd,"aaa",3);   close(fd);   return 0; } 

- no idea ... possible kernel code of uart initialisation incorrect

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