TMS570 CLOCK PROBLEM

Hi Node,

Can you let us know how did you measure the LED frequency, using a oscilloscope and the measuring the time period of the output waveform?

I quickly tried with your settings to toggle a GIO and see a proper 1ms/10ms output, when i measured the GIO output time period using an oscilloscope.

Regards,

Praveen

Hi Praveen:

    I use the RTI compare(compare0 and compare3) interrupt to flash the LED. In thertiNotification() program, I process it like this:

void rtiNotification(uint32 notification)
{
/*  enter user code between the USER CODE BEGIN and USER CODE END. */
/* USER CODE BEGIN (5) */
	if(notification == rtiNOTIFICATION_COMPARE0)
	{
		ulTimeCounter0 += 1;
		
		if((ulTimeCounter0 % 1000) == 0)
		{
			ulLED0Bit ^= 1;
			gioSetBit(hetPORT, 0, ulLED0Bit);
		}
	}
	
	if(notification == rtiNOTIFICATION_COMPARE3)
	{
		ulTimeCounter3 += 1;
		
		if((ulTimeCounter3 % 50) == 0)
		{
			ulLED3Bit ^= 1;
			gioSetBit(hetPORT, 3, ulLED3Bit);
		}
	}
/* USER CODE END */
}

You can see, when the compare interrupt happens, the uiTimeCounter0/3 increased by 1. Then use the timecounter remaind by 1000 and 50, so the LED flash frequency should be 1 seconds and 0.5 seconds. This can be seen by eyes.

Regards,

Node

Node,

I've checked your code and everything looks good to me.
Here is attached a project (CCS and Halcogen) that I've created using your code.

The 2 LEDs blink at the correct speed to me.

3240.RTI.zip

Please have a try and let me know.

Hi Jean:

   I tried your code on the USB Kit, it works correct. So I check the configuration of HalCoGen's Global Clock Module and PLL, I find some difference between us:

   This is your configuration:

My configuration is:

If you try the configuration as mine, the result will be different.

I set the VCLK1 at 10Mhz, because in my product, I have an extern SPI device which has a low speed(50~80K buard rate), and I also use the NHET module, so I set the VCLK2 at 70MHz.

So my question is : will this two clock domains(VCLK1 and VCLK2)  affect the RTI module? Is there any problem if I set the PLL output at the high speed(140MHz for TMS570LS20216PGE)?

Please let me know, thank you.

Regards,

Node