[DM6437] Problem with UART Example

Is there anyone who can give me some suggestion?

If you set a breakpoint on the second Submit, are the values of buf and len correct?

yes, they are correct just not sending out.

buf point to string "UART Demo Starts:  INPUT a file of size 1000 bytes"

and

len = 50

RandyP said:

If you set a breakpoint on the second Submit, are the values of buf and len correct?

In the BIOS API Reference Guide, the example for GIO_Submit shows the size parameter being reinitialized even though it is to the same value. This implied to me that the first call might change this value. That is why I asked about the values before the second call.

Does the second one run differently when you set the breakpoint and then run after a long physical delay?

As a debug technique, I recommend reinitializing both parameters and also inserting a very long delay between the two calls to GIO_Submit.

What is the status return value after the first one and after the second one?

What are the bufp and len values after the second call?

Regards,
RandyP

Thanks for your reply, RandyP.

I added blue line codes following your advice to the example, still doesn't solve the problem.

The bufp and len values remain the same in the process even after the second call.

Both first and second status return 0.

    // ===================================================

    str = "UART Demo Starts:  INPUT a file of size 1000 bytes";

    // Copy to start string to Cache aligned buffer

    strcpy(uartTestStringStart,str);

    // Input buffer

    buf.addr = uartTestStringStart;

    // Time out value

    buf.timeout = SYS_FOREVER;

    // Length of data

    len = strlen(uartTestStringStart);

    status = GIO_submit(hUart_OUT,IOM_WRITE, &buf, &len, NULL);  

    // status = 0

    TSK_sleep(2000u);    /* Add large delay */

    // reinitializing Input buffer

    buf.addr = uartTestStringStart;

    // reinitializing Time out value

    buf.timeout = SYS_FOREVER;

    // reinitializing  Length of data

    len = strlen(uartTestStringStart);

    status = GIO_submit(hUart_OUT,IOM_WRITE,&buf,&len,NULL);

   // status = 0

   // ======================================================

RandyP said:

In the BIOS API Reference Guide, the example for GIO_Submit shows the size parameter being reinitialized even though it is to the same value. This implied to me that the first call might change this value. That is why I asked about the values before the second call.

Does the second one run differently when you set the breakpoint and then run after a long physical delay?

As a debug technique, I recommend reinitializing both parameters and also inserting a very long delay between the two calls to GIO_Submit.

What is the status return value after the first one and after the second one?

What are the bufp and len values after the second call?

Regards,
RandyP

Hi, RandyP.

Any other suggestion?

Perhaps the BIOS forum can provide some answers. I do not have more suggestions.

Regards,
RandyP