CC1310 sensor controller tdcWaitUs() timeout too short.

Armin Inauen

Intellectual 450 points

I use tdcWaitUs(400) to wait for an TDC event with a timeout of 400us. Before and after the wait I toggle a GPIO.

Sometimes tdcWaitUs() ends just after 347us without that an event appeared. tcdCheckDoneEv(done) sets done to 0.

How accurate is this timeout?

Regards

Armin

over 9 years ago

0 TER over 9 years ago

TI__Guru**** 317180 points

We did a quick test with the following code in the execution code:
gpioSetOutput(AUXIO_O_LED_CTRL);
gpioClearOutput(AUXIO_O_LED_CTRL); // <--- From here

tdcWaitUs(400); // 400.18 us

gpioSetOutput(AUXIO_O_LED_CTRL); // <--- To here
gpioClearOutput(AUXIO_O_LED_CTRL);

and we measured 400.18 us using the task testing in Sensor Controller Studio.

0 Armin Inauen over 9 years ago in reply to TER

Intellectual 450 points

I think it's the same problem as in e2e.ti.com/.../512970
RF is disturbing the Sensor Controller.

0 TER over 9 years ago in reply to Armin Inauen

TI__Guru**** 317180 points

Could be. Note that I only tested this task with nothing else in the system and then the timing is correct.

Sub-1 GHz

Sub-1 GHz forum

CC1310 sensor controller tdcWaitUs() timeout too short.