Beware that this post is related to an SDK in maintenance mode
More Info: Consider nRF Connect SDK for new designs
This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

SPI MOSI & MISO problems

Hi!

I have a custom board with a NRF52840 and some extra sensors for my application. I'm trying to comunicate with one SPI sensor but I have a little extrange behavior. I put my osciloscope on the MOSI, MISO and SCK pins and I don't have any signal on MISO and MOSI pins.

To test the hardware, I'm using the example of the SDK 17.0.2, located at \examples\peripheral\spi, with a little modifications for my board, here is my code:

Fullscreen
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
#include "nrf_drv_spi.h"
#include "app_util_platform.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"
#include "boards.h"
#include "app_error.h"
#include <string.h>
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#define SPI_INSTANCE 0 /**< SPI instance index. */
static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE); /**< SPI instance. */
static volatile bool spi_xfer_done; /**< Flag used to indicate that SPI instance completed the transfer. */
#define TEST_STRING "Nordic"
static uint8_t m_tx_buf[] = TEST_STRING; /**< TX buffer. */
static uint8_t m_rx_buf[sizeof(TEST_STRING) + 1]; /**< RX buffer. */
static const uint8_t m_length = sizeof(m_tx_buf); /**< Transfer length. */
/**
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

I'm missing some configuration?

Thanks!