Can't setup adc with config tools. Sampled channels section shows all channels disabled.

jaycrossbee — Sat, 03 Sep 2022 20:20:16 GMT

I am trying to continuously sample ADC0 CH1, and have set up using config tools from inside MCUXpresso. When I choose Sampled channels the channel number column always has disabled written at the end.

I suppose rather than continously sample, I would like to use the systemTick to trigger a single channel sample and conversion every 10 ms.

Can you please explain what I am doing wrong in the first paragraph and also how to use the systick to periodically sample instead?

The configTool screen of ADC setupShowing the code before main

For the first paragraph, here is the autogenerated config info (with extra info) from peripherals.c

/*Begin paste

/***********************************************************************************************************************
* ADC0 initialization code
**********************************************************************************************************************/
/* clang-format off */
/* TEXT BELOW IS USED AS SETTING FOR TOOLS *************************************
instance:
- name: 'ADC0'
- type: 'lpc_adc'
- mode: 'ADC'
- custom_name_enabled: 'false'
- type_id: 'lpc_adc_d74172b5bd0591c0d32a6c93c043a67f'
- functional_group: 'BOARD_InitPeripherals'
- peripheral: 'ADC0'
- config_sets:
- fsl_adc:
- doSelfCalibration: 'true'
- adcConfig:
- clockMode: 'kADC_ClockSynchronousMode'
- clockSourceFreq: 'BOARD_BootClockIRC12M'
- clockDividerNumber: '0'
- enableLowPowerMode: 'false'
- voltageRange: 'kADC_HighVoltageRange'
- thresholdConfig:
- ADC_SetThreshold0: 'false'
- thresholdSettingsPair0:
- lowValue: '0'
- highValue: '0'
- ADC_SetThreshold1: 'false'
- thresholdSettingsPair1:
- lowValue: '0'
- highValue: '0'
- enableSeqConfigurationA: 'true'
- adcConvSeqConfigA:
- enableHighPriority: 'true'
- adcConvSeqConfig:
- triggerMaskM: '0U'
- triggerPolarity: 'kADC_TriggerPolarityNegativeEdge'
- enableSyncBypass: 'false'
- enableSingleStep: 'false'
- interruptMode: 'kADC_InterruptForEachConversion'
- enableSeqConfigurationB: 'false'
- adcConvSeqConfigB:
- enableHighPriority: 'false'
- adcConvSeqConfig:
- triggerMaskM: '0U'
- triggerPolarity: 'kADC_TriggerPolarityNegativeEdge'
- enableSyncBypass: 'false'
- enableSingleStep: 'false'
- interruptMode: 'kADC_InterruptForEachConversion'
- channels:
- 0:
- channelName: ''
- channelNumber: 'CH.1'
- channelThresholdPair: 'thresholdPair0'
- thresholdInterruptMode: 'kADC_ThresholdInterruptDisabled'
- conversion_sequence: 'a'
- interrupt_sel: 'kADC_ConvSeqAInterruptEnable'
- enable_irq_seqA: 'true'
- adc_interrupt_seqA:
- IRQn: 'ADC0_SEQA_IRQn'
- enable_interrrupt: 'enabled'
- enable_priority: 'true'
- priority: '3'
- enable_custom_name: 'false'
- enable_irq_seqB: 'false'
- adc_interrupt_seqB:
- IRQn: 'ADC0_SEQB_IRQn'
- enable_interrrupt: 'enabled'
- enable_priority: 'false'
- priority: '0'
- enable_custom_name: 'false'
- enable_irq_thcmp: 'false'
- adc_interrupt_thcmp:
- IRQn: 'ADC0_THCMP_IRQn'
- enable_interrrupt: 'enabled'
- enable_priority: 'false'
- priority: '0'
- enable_custom_name: 'false'
- enable_irq_ovr: 'false'
- adc_interrupt_ovr:
- IRQn: 'ADC0_OVR_IRQn'
- enable_interrrupt: 'enabled'
- enable_priority: 'false'
- priority: '0'
- enable_custom_name: 'false'
* BE CAREFUL MODIFYING THIS COMMENT - IT IS YAML SETTINGS FOR TOOLS **********/
/* clang-format on */
const adc_config_t ADC0configStruct = {
.clockDividerNumber = 0UL,
.enableLowPowerMode = false,
.voltageRange = kADC_HighVoltageRange,
};
/* Conversion sequence A configuration structure */
const adc_conv_seq_config_t ADC0ConvSeqAConfigStruct = {
.channelMask = 2U,
.triggerMask = 0U,
.triggerPolarity = kADC_TriggerPolarityNegativeEdge,
.enableSyncBypass = false,
.enableSingleStep = false,
.interruptMode = kADC_InterruptForEachConversion
};

static void ADC0_init(void) {
/* Perform self calibration */
ADC_DoSelfCalibration(ADC0_PERIPHERAL, ADC0_CLK_FREQ);
/* Initialize ADC0 peripheral */
ADC_Init(ADC0_PERIPHERAL, &ADC0configStruct);
/* Configure priority for sequence A */
ADC_SetConvSeqAHighPriority(ADC0_PERIPHERAL);
/* Configure the conversion sequence A */
ADC_SetConvSeqAConfig(ADC0_PERIPHERAL, &ADC0ConvSeqAConfigStruct);
/* Enable the conversion sequence A */
ADC_EnableConvSeqA(ADC0_PERIPHERAL, true);
/* Enable interrupt from ADC */
ADC_EnableInterrupts(ADC0_PERIPHERAL, kADC_ConvSeqAInterruptEnable);
/* Configure threshold compare interrupt on channel 1 */
ADC_EnableThresholdCompareInterrupt(ADC0_PERIPHERAL, 1U, kADC_ThresholdInterruptDisabled);
/* Interrupt vector ADC0_SEQA_IRQn priority settings in the NVIC. */
NVIC_SetPriority(ADC0_ADC_SEQ_A_IRQN, ADC0_ADC_SEQ_A_IRQ_PRIORITY);
/* Enable interrupt ADC0_SEQA_IRQn request in the NVIC. */
EnableIRQ(ADC0_ADC_SEQ_A_IRQN);
}

End past*/

Re: Can't setup adc with config tools. Sampled channels section shows all channels disabled.

Alice_Yang — Mon, 05 Sep 2022 08:26:32 GMT

Hello,

You can use BURST mode, there is lpc_adc_burst demo under SDK.

Alice

Re: Can't setup adc with config tools. Sampled channels section shows all channels disabled.

jaycrossbee — Mon, 05 Sep 2022 15:58:50 GMT

Thank you Alice, that is what I wanted. Can you recommend where I would see how to start a conversion from the sysTick handler?

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Can't setup adc with config tools. Sampled channels section shows all channels disabled.

Re: Can't setup adc with config tools. Sampled channels section shows all channels disabled.

Re: Can't setup adc with config tools. Sampled channels section shows all channels disabled.