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Original question:
HI all
We use AFE7769 onchip AUX 12bit SAR ADC to sample low-speed signal like PA temperature. And We use function auxAdcInSel and readAuxAdc to finish the job.
We test INP=VREF/2, INM=AVSS and INP=AVSS, INM=VREF/2， the conversion result is correct.
But if seting INP=AUX5, INM=AVSS(the input voltage is 0.4V on GPIOD2), the conversion result is only 2080,which is 0.02V. Just like the signal doesn't come in.
I try to bypass the the input buffer,disable the GPIO pullup and set GPIO for analog input.
I don't know whether the operation is correct because the datasheet use GPIOB/C/D/E but the register map use GPIO0~79, but doesn't tell the mapping relationship.
And the register map also mentioned a crossbar selection which refer to a separate xls file. how can we download the crossbar file and gpio mapping information?
TKS!!
