STM32 Development Log 6 : ADC sampling not working

ADC 1 and 2 pins for spi 3 (board) SPI2 in the MCU:

Supply is from AN_5V, requires 12V in power supply.

ADC1 reset

ADC1 conv start = J1 2= PE3

ADC CS 1 = J2 12 = PI0

SPI3 clock

ADC1 busy = J1 10 = PI10

SPI3 MISO = J2 8 = SPI2 MISO of MCU  = PI2

 

ADC2 reset

ADC2 conv start= J1 4= PI8

ADC CS 2 = J2 6 = actually SPI3 board MOSI pin  = PI3

SPI3 clock

ADC2 busy = J1 12 =PI11

SPI3 MISO

Base board side:

 

Controller side

 

Original SPI2 config from SPI-ADC-DAC demo:

 

 PI1 PI2 as clock and MISO for SPI2

ADC	IC	Channels
ADC1	ADS7606 (U9)	AN0–AN7
ADC2	ADS7606 (U10)	AN8–AN15

All 8 channels on each ADS7606 are sampled simultaneously   Low pass filter at the input line of each adc channel: R = 100 Ω C = 0.1 µF 16 kHz low-pass anti-alias filter

Pin	Purpose
PI8	ADC1 conversion trigger (CONVST)
PI11	ADC1 BUSY signal
PI9	ADC2 conversion trigger (CONVST)
PI10	ADC2 BUSY signal
PI0	ADC1 SPI chip select
PI3	ADC2 SPI chip select