about programable UART Baudrate

[Altera_Forum]

the readme.txt of the board_diag show that: 

 * - UART test  * Tests UART functionality for the UART defined as STDOUT. * * Currently, only tested on the JTAG UART device.  the component UART in the SOPC Builder has a option "Baud rate can be change by software". Are there any API that can control the divisor register and set baud rate with software?  thank u!

[Altera_Forum]

ffone13, 

 There is an ioctl call to set the baud rate etc for the UART. If you look in the manual for the UART n2cpu_nii51010.pdf and look under the software programming model there is a section in here on ioctl which is where you should start.

[Altera_Forum]

hello rugbybloke, 

 could you look at the following code that change the baudrate? in the sopc builder i have set the option that divisor can be change. and the result is when execute:  if (fd->dev->ioctl)  {  rc = fd->dev->ioctl(fd, req, arg);  } it stop!  /********************************************************/ int main (void) {   char* msg = "hello world";  FILE* fp;   struct termios* term;    fp = fopen ("/dev/uart1", "w");    if (fp)  {  term->c_ispeed=B57600;  ioctl(fp, TIOCMSET, term);  fprintf(fp, "%s",msg);  fclose (fp);  }  return 0; }  /********************************************************/  could you show me how to do? thank you!

[Altera_Forum]

ffone13, 

 My guess is that you don't have the ioctl code included, the comment at the top of the driver gives you some clues  /*  * To reduce the code footprint of this driver, the ioctl() function is not  * included by default. If you wish to use the ioctl features provided   * below, you can do so by adding the option : -DALTERA_AVALON_UART_USE_IOCTL  * to CPPFLAGS in the Makefile (or through the Eclipse IDE).  */  If this does not solve the problem then either step into the ioctl call to find the offending line, or set a breakpoint in the ioctl code inside the UART driver to find where the problem is.

[Altera_Forum]

Yes, you are right.I have finished it. but i find a bug that it seems to be in "static int alt_avalon_uart_tiocmset (alt_avalon_uart_dev* dev, struct termios* term) " function 

of the altera_avalon_uart.c .   IOWR_ALTERA_AVALON_UART_DIVISOR(dev->base, ((dev->freq/speed) - 1)); the speed should be  dev->termios.c_ispeed, i think. because firstly speed = dev->termios.c_ispeed; is the original value.   thank you for reply!

[Altera_Forum]

ffone, 

 Looks like you're right thanks for the tip