LAUNCHXL-CC1350: RF_getCurrentTime()

sudhir mishra

Expert 1100 points

Part Number: LAUNCHXL-CC1350

Hi,

time1 = RF_getCurrentTime();

after some time again taking the time

time2 = RF_getCurrentTime();

time = time1-time2;

I want to know that what unit time it return, How to calculate this time please help.

Basically I want to measure time which has microsecond level efficiency, Like want to measure time spent in sending 128 byte packet(time to execute some rf command).

Like in unit ms or us.

start Time : 388738259 }
End Time : 1305254040 }

time spent = (---- )us or ms.

over 7 years ago

0 Richard W. over 7 years ago

TI__Genius 14860 points

Hi,

the returned value is an absolute time stamp in RAT ticks. The radio timer (RAT) operates at 4 ticks per microsecond. Substract end - start and divide the result by 4, then you'll get the duration in microseconds.

uint32_t start = RF_getCurrentTime();
// Do something ...
uint32_t end = RF_getCurrentTime();

uint32_t duration = (end - start)/4;

0 Orl Nick over 7 years ago in reply to Richard W.

Prodigy 150 points

"duration = (end - start)/4;"
- this is a terrible bug generator. Sometimes end < start.
Best regards, Nik.

0 Richard W. over 7 years ago in reply to Orl Nick

TI__Genius 14860 points

Orl Nick said:
"duration = (end - start)/4;"
- this is a terrible bug generator. Sometimes end < start.
Best regards, Nik.

I don't agree. The RAT is a 32 bit timer and we are using 32 bit modulo arithmetic (uint32_t). Hence, the result of the above equation is always correct.

0 Orl Nick over 7 years ago in reply to Richard W.

Prodigy 150 points

I'm sorry very match.
Best regards, Nik.

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Sub-1 GHz forum

LAUNCHXL-CC1350: RF_getCurrentTime()