TWI/I2C communication with custom nrf52832 board doesn't work

[rajkm]

My pcb is nrf52832 based, with SPI interfacing ICM20649 sensor.

- Nordic SDK 11.0

- Softdevice 2.0

I am able to flash example code of SPI based  ble_peripheral and mpu and advertise, but the same code doesn't advertise with TWI example code. I also flashed TWI scanner with, but no results on RTT viewer.

pin configuration

#if defined(BOARD_PCA10040)
#define MPU_TWI_SCL_PIN 4
#define MPU_TWI_SDA_PIN 27

on pcb SPI configuration is :

SCL-- P0.04

SDA-- P0.27

SDI-- P0.26

NCS-- P0.05

[Jørgen Holmefjord]

Hi,

Have you tried debugging the application, to see if any error codes are reported?

Can you post code snippets showing how you configure TWI? TWI scanner example is not available in SDK 11, which SDK did you use that from?

Best regards,
Jørgen

[Jørgen Holmefjord]

The example you are using is initializing the UART peripheral. The UART use P0.05 as RTS pin by default (RTS_PIN_NUMBER is defined in pca10040.h BSP file).

Did you change the pin used by UART? If not, you will not be able to use P0.05 for SPI interface.

Please clarify if you are using TWI or SPI. You mention both in your post.