bios6 function Timestamp_getFreq()

vic lin

Intellectual 735 points

Hello expert.

We have customized board, base on DM385, use CBB RDK 1.5

mcfw/src_bios6/utils/src/utils.c function, Timestamp_getFreq(&cpuHz)

the return value is set at double.

e.g I set 200Mhz, but read value is 400Mhz.

is something wrong?

over 11 years ago

0 Badri Narayanan over 11 years ago

TI__Guru 59700 points

This is correct value. The frequency returned is the frequency of the unicache CTM timer which operates at 2x the Ducati M3 frequency.

0 vic lin over 11 years ago in reply to Badri Narayanan

Intellectual 735 points

Hi Badri Narayana, thank you for your reply.

ok, but I use Utils_getCurTimeInMsec() get time is wrong.

the actual value obtained was twice,

I write a test function is attached ->

Fullscreen 5582.getTimeTestFunction.c Download

//#define USE_LINUX_API

unsigned int AUDIO_GetTimeStamp(void)
{
#if defined USE_LINUX_API
	struct timeval timeval;

	gettimeofday(&timeval, NULL);
	return (timeval.tv_sec * 1000) + (timeval.tv_usec + 500) / 1000;
#else
	return (Vcam_getCurVpssM3Time());
#endif	
}

//------------------------------------------------------------------------------------------------------
Void Audio_recordMain(Void * arg)
{
	int runCount = 0;
	int startTime = AUDIO_GetTimeStamp();

	while(1) {
        	runCount++;

		if ((AUDIO_GetTimeStamp()-startTime) >= 1000) {	// time >= 1 sec
			printf("#### startTime: %d, runCount: %d\n", startTime, runCount);
			runCount = 0;
			startTime = AUDIO_GetTimeStamp();
		}
	}

}

both the linux api gettimeofday(&timeval, NULL) and Vcam_getCurVpssM3Time() to compare,

the m3Time 1sec actual was 2sec.

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bios6 function Timestamp_getFreq()