MSP430F5529: How can read PWM adc from adc12?

Hi Weihuang,

Actually, MSP430F5529 can use Timer to trigger ADC sampling, you can use this register to control the sampliny source:

And you can find the trigger source in datasheet:

Then you can refer those example code:

https://dev.ti.com/tirex/explore/node?node=ACnpdkh9h39muQoWLY8rUg__IOGqZri__LATEST

Thanks!

Best Regards

Johnson

Best Regards

Johnson

Hi Johnson,

My PWM output is use P2_5/TA2_2 (1kHZ and 20% duty-cycle) and want to capture adc on high pluse.

According your information, I need init TA0_1 to 1kHz frequency. Is right?

Then set ADC12 clock source to ADC12_A_CLOCKSOURCE_SMCLK and sampleHoldSignalSourceSelect to ADC12_A_SAMPLEHOLDSOURCE_1?

Is that setting can reach my goal?

My code:

--- Timer setting ---

//Start timer in continuous mode sourced by SMCLK

Timer_A_initContinuousModeParam initContParam = {0};

initContParam.clockSource = TIMER_A_CLOCKSOURCE_SMCLK;

initContParam.clockSourceDivider = TIMER_A_CLOCKSOURCE_DIVIDER_1; 

initContParam.timerInterruptEnable_TAIE = TIMER_A_TAIE_INTERRUPT_DISABLE;

initContParam.timerClear = TIMER_A_DO_CLEAR;

initContParam.startTimer = false;

Timer_A_initContinuousMode(TIMER_A0_BASE, &initContParam);

//Initialise compare mode

Timer_A_clearCaptureCompareInterrupt(TIMER_A0_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_1);

Timer_A_initCompareModeParam initCompParam = {0};

initCompParam.compareRegister = TIMER_A_CAPTURECOMPARE_REGISTER_1;

initCompParam.compareInterruptEnable = TIMER_A_CAPTURECOMPARE_INTERRUPT_ENABLE;

initCompParam.compareOutputMode = TIMER_A_OUTPUTMODE_SET_RESET;

initCompParam.compareValue = COMPARE_VALUE;

Timer_A_initCompareMode(TIMER_A0_BASE, &initCompParam);

Timer_A_startCounter(TIMER_A0_BASE,TIMER_A_CONTINUOUS_MODE);

--- ADC setting ---

GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P6, GPIO_PIN4);

/* Initialize the ADC12_A Module */
ADC12_A_init(ADC12_A_BASE,
ADC12_A_SAMPLEHOLDSOURCE_1,
ADC12_A_CLOCKSOURCE_SMCLK,
ADC12_A_CLOCKDIVIDER_1);

ADC12_A_setupSamplingTimer(ADC12_A_BASE,
ADC12_A_CYCLEHOLD_96_CYCLES,
ADC12_A_CYCLEHOLD_4_CYCLES,
ADC12_A_MULTIPLESAMPLESDISABLE);

/* Configure Memory Buffer */
ADC12_A_configureMemoryParam config_param = {0};
config_param.memoryBufferControlIndex = ADC12_A_MEMORY_0;
config_param.inputSourceSelect = ADC12_A_INPUT_A4;
config_param.positiveRefVoltageSourceSelect = ADC12_A_VREFPOS_AVCC;
config_param.negativeRefVoltageSourceSelect = ADC12_A_VREFNEG_AVSS;
config_param.endOfSequence = ADC12_A_ENDOFSEQUENCE;

ADC12_A_configureMemory(ADC12_A_BASE, &config_param);

ADC12_A_setResolution(ADC12_A_BASE, ADC12_A_RESOLUTION_12BIT);

ADC12_A_enable(ADC12_A_BASE);

Thanks.

Hi Zhengwei,

This is correct:

Zheng Wei Huang said:

Then set ADC12 clock source to ADC12_A_CLOCKSOURCE_SMCLK and sampleHoldSignalSourceSelect to ADC12_A_SAMPLEHOLDSOURCE_1?

maybe you can debug your code via some breakpoint.

And another method , you can enable TA CC1 interrupt, then run ADC sampling code in this interrupt route.

Thanks!

Best Regards

Johnson

Hi Johnson,

My above code not enable TA CC1 interrupt? If not, how should enable? or can't in CONTINUOUS_MODE? 

Thanks.

Hi Wei Huang,

You can refer to this example code to enable CC1 interrupt:

https://dev.ti.com/tirex/explore/node?node=AFkOtmwplfDAIL4v7fFedQ__IOGqZri__LATEST

Thanks!

Best Regard