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Altera_Forum's avatar
Altera_Forum
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20 years ago

how could i change my UART baud

My UART baud has been sent to 115200 in the SOPC builder, and can be changed by software,but hou could i chang it to be 9600 with the Language of Nios2,who can help me ,thanks very much!
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

something like this:

int uart_set_baudrate(int filedescriptor,int baudrate) {

struct termios term;

int res;

assert(filedescriptor);

res=ioctl(filedescriptor,TIOCMGET,&term);

if(res<0) {

DPRINTF("ERROR ioctl filedescriptor:%d\r\n",filedescriptor);

return res;

}

term.c_ispeed=baudrate;

term.c_ospeed=baudrate;

res=ioctl(filedescriptor,TIOCMSET,&term);

if(res<0) {

DPRINTF("ERROR ioctl filedescriptor:%d\r\n",filedescriptor);

}

return res;

}

to get filedescriptor use:

int fd;

fd=open("/dev/uart_0",O_RDWR | O_NONBLOCK | O_NOCTTY);