LPC1778 ADC problem

lorenzogalbiati — Wed, 21 Mar 2018 11:03:02 GMT

Hello,

I'm a newbie with LPC1778 and I'm facing a problem with ADC.

I have set ADC in single conversion mode and my acquisition routine is:

WORD ADC_GetSample(BYTE channel)
{
WORD result;
ADC_Init();
AD0CR_bit.SEL=(1<<channel);               //one-hot code
AD0CR_bit.START=1;                              //start conversion
while (AD0GDR_bit.DONE==0);               //wait for end of conversion
result=(WORD)AD0GDR_bit.RESULT;
return result;
}

This works correctly it runs fast but it fails when the routine it interrupted by an interrupt or when I do a step-by-step debug in IAR.

In this two situations the DONE bit is always 0 and the wile loop never ends.

Why?

Has anyone found the same problem ?

Best regards.

Re: LPC1778 ADC problem

jeremyzhou — Thu, 22 Mar 2018 02:38:11 GMT

Hi Lorenzo Galbiati,

Thank you for your interest in NXP Semiconductor products and

the opportunity to serve you.

I'd highly recommend you to operate the register directly instead of bit field way, please giving a try.

Have a great day,

TIC

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LPC MicrocontrollersのトピックLPC1778 ADC problem

LPC1778 ADC problem

Re: LPC1778 ADC problem