LAUNCHXL-F280049C: ADC temp sensor demo app reads 0xfff

DTruex

Part Number: LAUNCHXL-F280049C
Other Parts Discussed in Thread: C2000WARE

Running the adc_ex3_temp_sensor demo app on the F280049C. This was imported from C:\ti\c2000\C2000Ware_1_00_05_00\driverlib\f28004x\examples\adc

The ADC result is always 0x0fff. I am checking this by placing a breakpoint at line 241 in adcB1isr and looking at sensorSample in the debugger.

Any thoughts on what to look for?

Thanks

over 7 years ago

0 tlee over 7 years ago

TI__Guru 62975 points

DTruex,

It looks like the example is setting the VREF as ADC_REFERENCE_EXTERNAL in initADC().

You can either change the ADC references to ADC_REFERENCE_INTERNAL (as is done in adc_ex1_soc_software.c) or you can provide an external 3.3V reference at J15.

-Tommy

0 DTruex over 7 years ago in reply to tlee

Intellectual 790 points

Thanks

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LAUNCHXL-F280049C: ADC temp sensor demo app reads 0xfff