sparkfun/SparkFun_ICM-20948_ArduinoLibrary

Unable to read ICM20948 Using NRF52840 via SPI

JacksonLtt opened this issue · 7 comments

JacksonLtt commented

Subject of the issue

I tried to use NRF52840 to read data from ICM20948 through SPI protocol, but I found that NRF52840 could not read the data from ICM20948 using SPI.

Your workbench

  • What platform are you using?
    I am using Arduino IDE. I used the Sparkfun ICM20948 library.

  • What version of the device are you using? Is there a firmware version?
    I used NRF52840 Adafruit Feather Express.

  • How is the device wired to your platform?
    image
    NRF52840 could not recognize the ICM20948 device.

  • How is everything being powered?
    I used usb to power the device.

  • Are there any additional details that may help us help you?
    I has successfully used NRF52840 to read data from ICM20948 using I2C. Additionally, I could used NRF52832 to read data from ICM20948 using I2C and SPI.

Steps to reproduce

Tell us how to reproduce this issue. Please post stripped down example code demonstrating your issue to a gist.
I used this firmware to program NRF52840.
https://github.com/JacksonLtt/sign_language/blob/main/Arduino/lib/SPI/nrf_one_imu/nrf_one_imu.ino

board NRF52840 ICM20948
MOSI M1 MOSI
MISO M0 MISO
CS A4 CS
SCK SCK SCLK
GND GND GND
VIN 3.3V 1V8-5V5

Expected behaviour

The NRF52840 should be able to read data from ICM20948.

Actual behaviour

image
NRF52840 could not recognize the ICM20948 device.

PaulZC commented

Hello Taiting (@JacksonLtt ),

This sounds the same as issue #88 ?

My answer is the same. The library works well on other platforms using SPI. There must be something unusual about this nRF board which is preventing the code from working.

Best wishes,
Paul

JacksonLtt commented
makin-stuff commented

@JacksonLtt Does "Example1_Basics.ino" work in SPI mode using your hardware setup?

Also, what boards package do you have installed to program with the nRF52840? I think @PaulZC is right that this is likely an issue with the Adafruit nRF board and/or board package you are using.

JacksonLtt commented

Hello,

Thank you for response:
The Example 1_Basics.ino does not work.
Here is screen shoot of the serial monitor:
image

I am using the Adafruit Feather nRF52840 Express from adafruit:
Here is setting:
image

PaulZC commented

Hello Taiting (@JacksonLtt ),

Can you please confirm if you are using this exact Adafruit board?

https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/pinouts

We need to know exactly which board you are using, because the pin numbering is very different from board to board.

I have Example1 working on a SparkFun Pro nRF52840 Mini on SPI. But I had to change the pin numbering (in variant.h) to make it work with the Adafruit Feather nRF52840 Express board package.

Best wishes,
Paul

PaulZC commented

If you are using that exact Adafruit board, then your connections should be:

Adafruit Feather nRF52840 Express SparkFun ICM20948
MI MISO
MO MOSI
A4 CS
SCK SCLK
GND GND
3V 1V8-5V5

On the Adafruit board, analog pin A4 is digital pin 18. So you need to change the start of Example1 to:

#include "ICM_20948.h" // Click here to get the library: http://librarymanager/All#SparkFun_ICM_20948_IMU

#define USE_SPI       // Uncomment this to use SPI

#define SERIAL_PORT Serial

#define SPI_PORT SPI // Your desired SPI port.       Used only when "USE_SPI" is defined
#define CS_PIN 18    // Which pin you connect CS to. Used only when "USE_SPI" is defined

Please let us know if this solves your issue.

Best wishes,
Paul

JacksonLtt commented

Hello Paul,

Thank you for your response.
The problem is solved. I did not setup correct pin of CS_PIN.

Best regards,
Taiting