topic Re: LPC4078 ADC problem in LPC Microcontrollers

LPC4078 ADC problem

albertoferrari — Fri, 27 Jan 2017 15:14:29 GMT

Hi everybody,

I'm using LPC4078 with LPCXpresso v8.1.4 (build 606).

I'm using 3 out of 8 ADC available on the LPC4078 (ADC0, ADC1 and ADC2) in burst mode.

It happens that sometimes, suddenly all the used ADCs tell me that the convertion has been done (DONE=1) but they give me 0 as result (even if the input voltage is about 0.5 volt).

Attacched you'll find the piece of code I used (here for debug I only check ADC0).

Do you have some hints about this issue?

Thanks in advance.

Alberto Ferrari

Original Attachment has been moved to: adc_lpc4078.c.zip

Re: LPC4078 ADC problem

soledad — Wed, 01 Feb 2017 23:44:06 GMT

Hi Alberto,

Could you please test the ADC example located at the path C:\nxp\LPCXpresso_8.1.4_606\lpcxpresso\Examples\LPCOpen ? This is in order to isolate the issue. I want to know if there is a hardware or software issue.

Have a great day,
Sol

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Re: LPC4078 ADC problem

Dezheng_Tang — Thu, 02 Feb 2017 00:24:48 GMT

Alberto,

If you do a burst on three channels, you need to make sure all channels have finished conversion, your code only checked ADC0 DONE bit. You can check STAT bit 0~2 and make sure all of them are set and no OVERRUN on any of these channels.