TMS320F280039C: Error in C2000 academy program for SCI lab for TMS320F280039C

Hi,

Thank you for trying C2000 Academy and providing the feedback. Can you please elaborate what is the issue? Is timer not starting?

Regards, Santosh

Hi Santosh,

Basically the CPUTimer_startTimer(INT_myCPUTIMER0) does not start the timer as mentioned in the academy lab. The base address should be the parameter but here the Interrupt is the parameter.

The correct syntax should be CPUTimer_startTimer(uint32_t base).

For the second issue the message printed on the terminal is somehow getting skipped.

Hi Prayag,

Thank you so much for pointing to the bug which was introduced in last release. It came right on time. We are getting ready for the next release, and it will be fixed in the release.

First part: 

//
// Start CPU Timer 0
//
CPUTimer_startTimer(myCPUTIMER0_BASE);

Second issue:

for(;;)
{
msg = "\r\nEnter a number 0-9: \0";
SCI_writeCharArray(mySCIA_BASE, (uint16_t*)msg, 24);

//
// Read a character from the FIFO.
//
receivedChar = SCI_readCharBlockingFIFO(mySCIA_BASE);
SCI_writeCharBlockingFIFO(mySCIA_BASE, receivedChar);

//Turns character to digit
delayCount = receivedChar - '0';

rxStatus = SCI_getRxStatus(mySCIA_BASE);
if((rxStatus & SCI_RXSTATUS_ERROR) != 0)
{
//
//If Execution stops here there is some error
//Analyze SCI_getRxStatus() API return value
//
ESTOP0;
}

//
// Echo back the character.
//
msg = " LED set to blink rate \0";
SCI_writeCharArray(mySCIA_BASE, (uint16_t*)msg, 25);
}

Please try this and confirm if it resolves your both issues.

Regards, Santosh

Hi Santosh,

It did not work. Apparently the issue is with SCI_writeCharBlockingFIFO(mySCIA_BASE, receivedChar);

Check this piece of code that I used. Instead of SCI_writeCharBlockingFIFO(mySCIA_BASE, receivedChar); I used SCI_writeCharArray(mySCIA_BASE, (uint16_t*)msg2, 1); and it worked properly.

The result is

Hi Santosh,

This is the result with your suggested code.

Correcting my earlier statement. Your suggested code worked.

But 

SCI_writeCharArray(mySCIA_BASE, (uint16_t*)msg, 25);

SCI_writeCharBlockingFIFO(mySCIA_BASE, receivedChar);

together shows wrong result(snap attached at start of thread).

Thank You for your support Santosh.

But I am still not clear on why the below 2 lines executed together does not work.

SCI_writeCharArray(mySCIA_BASE, (uint16_t*)msg, 25);

SCI_writeCharBlockingFIFO(mySCIA_BASE, receivedChar);

Santosh Jha said:

SCI_writeCharArray() function waits for 2 character in FIFO to put the TXBUF, but SCI_writeCharBlockingFIFO() just waits for 1 char in FIFO. That causes the flow issue.

Can you please elaborate on this.

Santosh Jha said:

If you want to keep the original flow, then change 

SCI_writeCharArray(mySCIA_BASE, (uint16_t*)msg, 25);

SCI_writeCharBlockingFIFO(mySCIA_BASE, receivedChar);

Here when I put some delay after both the line the flow was intact.

Hi Santosh,

SCI_writeCharArray(mySCIA_BASE, (uint16_t*)msg, 25);

SCI_writeCharBlockingFIFO(mySCIA_BASE, receivedChar);

DEVICE_DELAY_US(1000000);

with this code the flow was intact.