topic LPC55S69 ADC channel 8 can't read any data in MCUXpresso General

LPC55S69 ADC channel 8 can't read any data

eagan_yu — Tue, 09 Jun 2020 09:28:43 GMT

Hi , I would greatly appreciate your help !!!

I'm using the LPC55S69 development board ADC example .

I changed channel 0 to channel 8 and also configured pin P0_16 .

I connected 3.3V to channel 8 with the dupont line .

But I can't read any data .

I hope you can point out my mistake and correct the problem. Thank you

Eagan

Thanks & Best Regards!

Re: LPC55S69 ADC channel 8 can't read any data

Alexis_A — Thu, 11 Jun 2020 15:23:02 GMT

Hello Eagan,

Did you configure the channel to working with single-ended side B in the command? The PIO0_16 has the same channel but in the side B of the module, so the only you would need to modify from the example is to define the configuration for the new pin and modify the command to point to the B side.

  /* Set conversion CMD configuration. */
    LPADC_GetDefaultConvCommandConfig(&mLpadcCommandConfigStruct);
    mLpadcCommandConfigStruct.channelNumber = DEMO_LPADC_USER_CHANNEL;
    mLpadcCommandConfigStruct.sampleChannelMode = kLPADC_SampleChannelSingleEndSideB;
    LPADC_SetConvCommandConfig(DEMO_LPADC_BASE, DEMO_LPADC_USER_CMDID, &mLpadcCommandConfigStruct);‍‍‍‍‍

Let me know if this helps you.

Best regards,

Alexis Andalon

Re: LPC55S69 ADC channel 8 can't read any data

eagan_yu — Wed, 14 Oct 2020 01:52:21 GMT

Hi Alexis_A

Thank you for your reply

My configuration is exactly what you said

Including the pin configuration to Analog

But I still can't read the data. It's always zero