Can't sample ADC1022 with SPI1 but SPI works fine

Projects Programming
1

I'm getting about 190 kSps with the ADC1022S021 on SPI using the RobTillaart ADC08XS library but using this SPI1 code only get zeros. I tried every suggestion I found on line and other SPI1 wirings. Got good results on other wirings with SPI. Just Pico RP2040 on Philhower core with Win11 Arduino. Does ADC08XS talk to SPI1 ?

//
//   Credits to
//  AUTHOR: Rob Tillaart
//  URL: https://github.com/RobTillaart/ADC08XS

#include "ADC08XS.h"
#include <spi.h>

ADC122S adc;          
#define bufSize  256
uint16_t buf[bufSize] = {0};

void setup(){

  Serial.begin(115200);
  delay(3000);

  SPI1.setRX(12);  // MISO orange    16      4
  SPI1.setTX(11);  // MOSI   red     19      3
  SPI1.setSCK(14);   //   yellow     18      2
  SPI1.setCS(13);   //     white     17      5

  SPI1.begin();

  adc.begin(13); //  

 for (int i = 0; i<bufSize; i++){
    buf[i] = adc.read(0);
 }

  for (int i = 0; i<bufSize; i++){
    Serial.print(i);
    Serial.print("  ");
    Serial.println(buf[i]);
    delay(10);
 }

}

void loop(){
}
2

Look at the library code...

If you use custom SPI other than default, you must pass the reference to your SPI instance to ADC constructor:

3

It would be helpful to know which Arduino board you're using.

1 Like
4

from the first post:

5

Thanks.

6

Fixed!!!
ADC122S adc(&SPI1); Worked
Wow that was fast.
Thank You

1 Like
7

@larry_gorham

It is a recent / new library, I have to add an SPI1 example.
Issue created - Add example for usage with SPI1 · Issue #6 · RobTillaart/ADC08XS · GitHub

8

This corrected code now works fine on core 1 with the SPI running faster. It samples at 174 kSps. Which is a bit slower than running on core 0 (190 kSps) but acceptable for now. I'll try the faster single channel ADC chip next. Many thanks to all.

//
//   Credits to
//  AUTHOR: Rob Tillaart
//  URL: https://github.com/RobTillaart/ADC08XS

#include "ADC08XS.h"
#include <spi.h>

ADC122S adc(&SPI1);

#define bufSize  256
uint16_t buf[bufSize] = {0};
uint32_t SPIspeed = 24000000UL;

void setup(){
}

void loop(){
}

void setup1(){

  Serial.begin(115200);
  delay(3000);

  adc.setSPIspeed(SPIspeed);

  SPI1.setRX(12);  // MISO orange    16      4
  SPI1.setTX(11);  // MOSI   red     19      3
  SPI1.setSCK(14);   //   yellow     18      2
  SPI1.setCS(13);   //     white     17      5

  SPI1.begin();

  adc.begin(13); //  

 for (int i = 0; i<bufSize; i++){
    buf[i] = adc.read(0);
 }

  for (int i = 0; i<bufSize; i++){
    Serial.print(i);
    Serial.print("  ");
    Serial.println(buf[i]);
    delay(10);
 }

}

void loop1(){
}
9

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