Testing your minidriver

The OMAP 5912 board has a debug serial port that this minidriver example uses to receive bytes on. In order to test this driver, you should build an OS image that sets up TCP/IP and lets you telnet to the board. Since you'll be using the serial port as a data source, don't run the serial driver and don't put debug printouts or verbosity on procnto in your image. Once you have an image, you should burn it onto the onboard flash where you can boot from it.

Connect a NULL-modem cable between your OMAP board and a host machine. The minidriver is running at 14400 baud, so make sure the host machine's serial port is also configured in this manner. On the host machine, begin sending characters to the serial port. Sample code should look like this:

...
uint8_t test_data[20] = {"012345678987654321"};
...

if ((fd = open("/dev/ser1", O_RDWR)) == -1)
{
   fprintf(stderr, "Unable to open device: %s (errno=%d\n", device, errno);
   return (-1);
}

for (;;)
{
write(fd, test_data + index, 1);
   index++;
   if (index == 19)
      index = 0;
}

This code sends a pattern of characters to the serial port so that the minidriver can capture data.

Now boot the OMAP 5912 board and telnet to it. Once connected, you can run the sample full driver, mdrvr-seromap, which does the following:

• attaches to the serial interrupt, stopping the minidriver
• reads the minidriver data area
• captures 64 characters from the serial port
• displays the minidriver data and the captured data, which should show the pattern of characters your sample application sent

Since the mdrvr-seromap application is a sample serial driver, you don't need to run the devc-seromap driver.