EK-TM4C1294XL: Read the ADC triggered by a Timer in an interval of time

Rocamadour

Part Number: EK-TM4C1294XL

Dear all

I have two timers configured, one at 350 kHz and another at 25 Hz. I used the 350 kHz to trigger the reading of the ADC, so that is my sampling frequency. I can read continuously without problems.

The problem is that I want the ADC to begin reading synchronized with the 25 Hz timer. Read 3000 samples (it would take 8.5 ms ~), deactivate the ADC and start again with the change of state of the 25Hz timer. I have tried a couple of things without success, I do not attach my code because I think my problem is that I am not understanding how to do it correctly.

Could you give me some clue how to do this properly or correct me if I'm confused on how I'm seeing things.

over 7 years ago

0 Bob Crosby over 7 years ago

TI__Guru 72500 points

I suggest you enable the 350KHz timer in the interrupt routine for the 25Hz timer. In the interrupt routine for the ADC (triggered by the 350KHz timer) you count conversions. After 3000 conversions you disable the 350KHz timer.

0 Rocamadour over 7 years ago in reply to Bob Crosby

Intellectual 255 points

By "enable the 350KHz timer in the interrupt routine" you mean the IntEnable(); instruction?

0 Bob Crosby over 7 years ago in reply to Rocamadour

TI__Guru 72500 points

You can use that function, or enable and disable the interrupt at the module level with TimerIntEnable() and TimerIntDisable().

Arm-based microcontrollers

Arm-based microcontrollers forum

EK-TM4C1294XL: Read the ADC triggered by a Timer in an interval of time