I am interfacing ADS8688 with stm32f429zi, I have used SPI. I have 2 different setup. first setup with 3 ADC in which all ADC channels gives output near 47000 and Second setup with 8 ADC which channels gives values near 23000. Why it gives half value

[AH_nt]

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[waclawek.jan]

Data shifted by one but for some reason? Observe SPI bus using logic analyzer and compare to waveform given in the ADC datasheet.

If SCK pin's GPIO OSPEEDR setting is low, try increasing it to medium.

JW

[AH_nt]

Thank you reply.. I checked SCK pin, it is high only. I will add here that I am using SPI with DMA here.