Want version of CLK_gethtime which doesn't require DSP/BIOS on C6678 EVM

James Steed

Expert 1905 points

I have a TMDXEVM6678L. I have code for getting the wallclock which uses CLK_gethtime. I am trying to remove all the DSP/BIOS code from my project so I don't have that dependency, and I believe CLK_gethtime requires DSP/BIOS. Is it possible to write my own version of this function which accesses clock registers directly or otherwise computes the same thing?

My existing code is

static int CLOCK_STARTED = 0;
static unsigned long CLOCK_START_TICK; /* ticks */
static float CLOCK_TICKS_PER_S;
int embWallclock(int *seconds) {
unsigned long tick;
float time;
if (!CLOCK_STARTED) {
unsigned long ticks_per_ms;
CLOCK_STARTED = 1;
ticks_per_ms = CLK_countspms();
CLOCK_TICKS_PER_S = (float)ticks_per_ms*1000.0;
CLOCK_START_TICK = CLK_gethtime();
}
tick = CLK_gethtime() - CLOCK_START_TICK;
time = (float)tick/CLOCK_TICKS_PER_S;
*seconds = (int)time;
return (int)((time - *seconds) * 1e9);
}

over 12 years ago

0 HRi over 12 years ago

Guru 10750 points

Hi james,

Two things you can do one is to use the device csl (chip support library) timer functions or to use TSCL, TSCH (extern volatile cregister UInt32 TSCL, TSCH;)

Thanks,

0 James Steed over 12 years ago in reply to HRi

Expert 1905 points

That's great, is there an equally easy way to get the

CLK_getprd()

and

CLK_countspms()

(if I'm using TSCL and TSCH)

0 HRi over 12 years ago in reply to James Steed

Guru 10750 points

Hi James,

I don't know of but probably you can follow the sys/bios packages\ti\bios\include\clk.h clk functions and rewrite them by using TSCL/TSCH,

Thanks,

0 James Steed over 12 years ago in reply to HRi

Expert 1905 points

Do you know how to get the Frequency? The clk.h just calls other BIOS or XDC functions and if I follow the function calls eventually I hit a dead end and can't see the code

xdc_runtime_Timestamp_getFreq(&freq);

Void Timestamp_getFreq(Types_FreqHz *freq)
{
Timestamp_SupportProxy_getFreq(freq);
}

#define Timestamp_SupportProxy_getFreq .........

Thanks
Jim

Processors

Processors forum

Want version of CLK_gethtime which doesn't require DSP/BIOS on C6678 EVM