TMS470M how get time between edge interrupts

Roman Zavyalov

Other Parts Discussed in Thread: HALCOGEN

Hi,

I want to get time between edge interrupts in microseconds.

hetGetTimestamp always returns 0.
Code generated in HalCoGen 3.06 and debugging in CCS 5.4 WCAP Data Field not changed over time.

Input pulses are shaped:

I tried the function edgeGetCounter(edge0), but the array FIFO1 are put only approximately the same values. How does it work this function?

Example my code:

notification.c file


void edgeNotification(uint32 edge)
{
unsigned long tc;
if(edge==edge0)
 {
tc = edgeGetCounter(edge0);

prev_tc-=tc;

prev_tc=-prev_tc;

FIFO1[++jkl]=prev_tc;

prev_tc=tc;
}
}

I used TMS470M HDK Board and configured HET Global Timing Configuration in HalCoGen:

Please help me get time between edge interrupts.

Regards,
Roman

over 12 years ago

0 Hari Pendurty over 12 years ago

TI__Intellectual 1480 points

Roman,

We are looking into your question and will get back to you.

Hercules Forum support

0 Henry Nguyen over 12 years ago in reply to Hari Pendurty

TI__Expert 4225 points

Hi Roman,

Can you please send me your halcogen configuration file?

I assume that you want to measure the time difference between rise to fall and fall to rise. is that correct?

The way it should work is that the WCAP instruction should be used to capture time stamp for any edge and then generate interrupt on each capture.

Then, on interrupt, your codes should read the current data field of WCAP.

Initialize previous value = 0;

gap = current value - previous value.

previous value = current value.

0 Henry Nguyen over 12 years ago in reply to Henry Nguyen

TI__Expert 4225 points

Roman,

can you pls. also send me your CCS projects (codes)?

0 Roman Zavyalov over 12 years ago in reply to Henry Nguyen

Intellectual 865 points

Hi Henry,

Yes, i want to measure the time difference between rise to fall and fall to rise.

I am doing on your recommendation, but hetGetTimestamp always returns 0.

CCS project and HalCoGen project is attached files to this post.

3225.inksat_exp.rar

Regards,

Roman

0 Roman Zavyalov over 12 years ago in reply to Roman Zavyalov

Intellectual 865 points

Hi Henry,

How i can run WCAP to save into his DATA field register?

My configuration (default by HalCoGen 3.06):

/* WCAP: Capture timestamp
 * - Instruction = 57
 * - Next instruction = 0
 * - Conditional next instruction = 0
 * - Interrupt = na
 * - Pin = na
 * - Reg = T
 */
 {
 /* Program */
 (0x00000B80U),
 /* Control */
 (0x00000004U),
 /* Data */
 0x00000000U,
 /* Reserved */
 0x00000000U
 }

Page 714 of "TMS470M Series TRM" does not give me enough information.

Regards,

Roman

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TMS470M how get time between edge interrupts