SPI communication with Lis3dh sensor (nrfConnect SDK)

Question

Hello,

I'm encountering an issue while configuring the SPI bus to communicate with a LIS3DH sensor using nrf52832. I'm working with Visual Studio Code using nrfConnect SDK (Zephyr).

Here's the Device Tree Source (DTS):

// SPDX-License-Identifier: Apache-2.0

/dts-v1/;

#include <nordic/nrf52832_qfaa.dtsi>

/ {

model = "xxx";

compatible = "xxx";

aliases {

led0 = &led0;

led1 = &led1;

led2 = &led2;

};

chosen {

zephyr,sram = &sram0;

zephyr,flash = &flash0;

zephyr,code-partition = &slot0_partition;

};

leds{

compatible = "gpio-leds";

led0: led_0{

gpios = <&gpio0 10 GPIO_ACTIVE_LOW>;

label = "Blue LED 0";

};

led1: led_1{

gpios = <&gpio0 9 GPIO_ACTIVE_LOW>;

label = "Green LED 1";

};

led2: led_2{

gpios = <&gpio0 8 GPIO_ACTIVE_LOW>;

label = "Red LED 2";

};

&flash0 {

partitions {

compatible = "fixed-partitions";

#address-cells = <1>;

#size-cells = <1>;

boot_partition: partition@0 {

label = "mcuboot";

reg = <0x0 0xc000>;

};

slot0_partition: partition@c000 {

label = "image-0";

reg = <0xc000 0x32000>;

};

slot1_partition: partition@3e000 {

label = "image-1";

reg = <0x3e000 0x32000>;

};

scratch_partition: partition@70000 {

label = "image-scratch";

reg = <0x70000 0xa000>;

};

storage_partition: partition@7a000 {

label = "storage";

reg = <0x7a000 0x6000>;

};

&gpio0 {

status = "okay";

};

&gpiote {

status = "okay";

};

lis3dh_spi_master: &spi0 {

compatible = "nordic,nrf-spi";

status = "okay";

pinctrl-0 = <&spi0_default>;

pinctrl-1 = <&spi0_sleep>;

pinctrl-names = "default","sleep";

cs-gpios = <&gpio0 18 GPIO_ACTIVE_LOW>;

reg_lis3dh: lis3dh@0{

compatible = "st,lis2dh";

reg = <0>;

irq-gpios = <&gpio0 16 GPIO_ACTIVE_HIGH>, <&gpio0 17 GPIO_ACTIVE_HIGH>;

spi-max-frequency = <8000000>;

};

&pinctrl {

spi0_default: spi0_default {

group1 {

psels = <NRF_PSEL(SPIM_SCK, 0, 15)>,

<NRF_PSEL(SPIM_MOSI, 0, 20)>,

<NRF_PSEL(SPIM_MISO, 0, 19)>;

};

spi0_sleep: spi0_sleep {

group1 {

psels = <NRF_PSEL(SPIM_SCK, 0, 15)>,

<NRF_PSEL(SPIM_MOSI, 0, 20)>,

<NRF_PSEL(SPIM_MISO, 0, 19)>;

low-power-enable;

};

The spi_file is :

#include <zephyr/kernel.h>

#include <zephyr/device.h>

#include <zephyr/devicetree.h>

#include <zephyr/drivers/gpio.h>

#include <zephyr/drivers/spi.h>

#define LIS3DH_OUT_X_L 0x28

#define LIS3DH_OUT_X_H 0x29

#define LIS3DH_SPI_MASTER DT_NODELABEL(lis3dh_spi_master)

// SPI master functionality

const struct device *spi_dev;

struct spi_cs_control spim_cs = {

.gpio = SPI_CS_GPIOS_DT_SPEC_GET(DT_NODELABEL(reg_lis3dh)),

.delay = 0,

};

static const struct spi_config spi_cfg = {

.operation = SPI_OP_MODE_MASTER | SPI_WORD_SET(8) | SPI_TRANSFER_MSB,

.frequency = 8000000,

.slave = 0,

.cs = &spim_cs,

};

void spi_init(void)

{

spi_dev = DEVICE_DT_GET(LIS3DH_SPI_MASTER);

if(!device_is_ready(spi_dev)) {

printk("SPI master device not ready!\n");

}

if(!device_is_ready(spim_cs.gpio.port)){

printk("SPI master chip select device not ready!\n");

}

uint8_t test_spi(void)

{

int err;

static uint8_t tx_buf[1];

static uint8_t rx_buf[1];

const struct spi_buf_set tx = {

.buffers = &tx_buf,

.count = 1

};

const struct spi_buf_set rx = {

.buffers = &rx_buf,

.count = 1

};

tx_buf[0] = LIS3DH_OUT_X_L;

err = spi_transceive(spi_dev, &spi_cfg, &tx, &rx);

if (err < 0) {

printk("spi_transceive_dt() failed, err: %d", err);

return err;

}

printk("\nTx data : %d, Tx data : %d",tx_buf[0], rx_buf[0]);

}

And the main calls spi_init() and test_spi().

I'm encountering this error during spi_transceive() function :

Bluetooth initialized
Advertising successfully started
BEACON START
[00:00:01.005,676] <err> os: ***** Reserved Exception ( -16) *****
[00:00:01.005,706] <err> os: r0/a1: 0x20006f00 r1/a2: 0x00016a0d r2/a3: 0x0002e2bf
[00:00:01.005,706] <err> os: r3/a4: 0x000169f9 r12/ip: 0x000169f9 r14/lr: 0x000169f9
[00:00:01.005,737] <err> os: xpsr: 0x00000000
[00:00:01.005,737] <err> os: s[ 0]: 0x00000000 s[ 1]: 0x00000000 s[ 2]: 0x00000000 s[ 3]: 0x00016c09
[00:00:01.005,767] <err> os: s[ 4]: 0x000169f9 s[ 5]: 0x00000000 s[ 6]: 0x00016b69 s[ 7]: 0x000169f9
[00:00:01.005,767] <err> os: s[ 8]: 0x00016f15 s[ 9]: 0x00031ed3 s[10]: 0x00016f15 s[11]: 0x00016f15
[00:00:01.005,798] <err> os: s[12]: 0x00016f15 s[13]: 0x00016f15 s[14]: 0x00016f15 s[15]: 0x00016f15
[00:00:01.005,798] <err> os: fpscr: 0x00031e89
[00:00:01.005,798] <err> os: Faulting instruction address (r15/pc): 0x000169f9
[00:00:01.005,859] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
[00:00:01.005,889] <err> os: Current thread: 0x20003030 (unknown)
[00:00:01.391,052] <err> fatal_error: Resetting system

Thank for you help