SPI on Nucleo_STMH533RE

[higginsa1]

Hello, I am unfortunately a beginner in terms of Zephyr, installation compiling works, all no problem, but now I just wanted to configure the SPI as master. Here I break my neck.

I have already looked at many examples, but either the device tree can no longer be compiled or the SPI ends with an error.

Does anyone have a tip for me? Surely a piece of cake for an experienced user?

How do I create a devicetree where I can configure the pins for CS, MOSI, MISO and Clock?

[higginsa1]

Now unfortunately the compile doesn't work :-( I think there can't be much missing?

nucleo_h533re.overlay

&spi1 {
pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pa7>;
pinctrl-names = "default";
cs-gpios = <&gpioa 0 GPIO_ACTIVE_LOW>; // Chip Select Pin
status = "okay";
};

prj.conf

CONFIG_GPIO=y
CONFIG_PRINTK=y

CONFIG_SPI=y

main.c

#include <stdio.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/printk.h>
#include <zephyr/device.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/spi.h>

int main(void)
{
#define SPI1_NODE DT_NODELABEL(spi1)

struct device * spi1_dev = DEVICE_DT_GET((SPI1_NODE);

if (!device_is_ready(spi1_dev)) 
{
    /* Not ready, do not use */
    return -ENODEV;
}

}

ERROR

C:/Projekte/SPI/Appl/src/main.c: In function 'main':
C:/Projekte/zephyr_base/core/include/zephyr/device.h:255:32: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
255 | #define DEVICE_DT_GET(node_id) (&DEVICE_DT_NAME_GET(node_id))
| ^
C:/Projekte/SPI/Appl/src/main.c:64:36: note: in expansion of macro 'DEVICE_DT_GET'
64 | struct device * spi1_dev = DEVICE_DT_GET(SPI1_NODE);
| ^~~~~~~~~~~~~
[5/9] Linking C executable zephyr\zephyr_pre0.elf
FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map C:/Projekte/SPI/Appl/target/release/zephyr/zephyr_pre0.map
:
C:/Projekte/SPI/Appl/src/main.c:69: undefined reference to `__device_dts_ord_77'
collect2.exe: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: 'C:\Tools\CMake\bin\cmake.EXE' --build 'C:\Projekte\SPI\Appl\target\release'

[JarmouniA]

#define SPI1_NODE DT_NODELABEL(spi1)

int main(void)
{
const struct device * const spi1_dev = DEVICE_DT_GET(SPI1_NODE);

if (!device_is_ready(spi1_dev)) 
{
    /* Not ready, do not use */
    return -ENODEV;
}
}

[yesustrasvina]

Maybe using SPI2? I had problems with SPI1 too

[yesustrasvina]

I just did simple communication via SPI in Nucleo F446RE board, I had similar errors, we can check my code to fix yours

main.c

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/spi.h>
#include <zephyr/logging/log.h>

LOG_MODULE_REGISTER(spi_test, LOG_LEVEL_DBG);

#define SPI_DEVICE_NODE DT_NODELABEL(spi2)

static const struct device *spi_dev = DEVICE_DT_GET(SPI_DEVICE_NODE);

int main( void )
{
if(!device_is_ready(spi_dev))
{
LOG_ERR("SPI device is not ready");
return 1;
}

LOG_INF("SPI device ready");

uint8_t tx_buffer[] = "YESUS"; // Message to send
uint8_t rx_buffer[sizeof(tx_buffer)] = {0}; //Buffer to receive data

struct spi_config spi_cfg = {
    .frequency = 10000000,
    .operation = SPI_WORD_SET(8) | SPI_TRANSFER_MSB,
    .slave = 0
};

struct spi_buf tx_buf = { .buf = tx_buffer, .len = sizeof(tx_buffer) };
struct spi_buf rx_buf = { .buf = rx_buffer, .len = sizeof(rx_buffer) };

struct spi_buf_set tx = { .buffers = &tx_buf, .count = 1 };
struct spi_buf_set rx = { .buffers = &rx_buf, .count = 1 };

while (1)
{
    int ret = spi_transceive(spi_dev, &spi_cfg, &tx, &rx);
    if(ret < 0)
    {
        LOG_ERR("SPI transfer failed (%d)", ret);
    }
    else
    {
        LOG_INF("SPI transfer successful");
    }

    k_sleep(K_SECONDS(5));
}
return 0;

}

nucleo_f446re.overlay

&spi2 {
pinctrl-0 = <&spi2_sck_pb13 &spi2_miso_pb14 &spi2_mosi_pb15>;
pinctrl-names = "default";
status = "okay";

spidev0: spi_device@0 {
    compatible = "zephyr,spi-device";
    reg = <0>;
    spi-max-frequency = <1000000>;  /* 1 MHz */
    label = "SPI_2_DEV";
};

};

prj.conf

CONFIG_SPI=y
CONFIG_SPI_STM32=y
CONFIG_LOG=y
CONFIG_STDOUT_CONSOLE=y
CONFIG_UART_CONSOLE=y

[yesustrasvina]

Try to add that piece of code in your overlay that defines a SPI peripheral device in Zephyr.
Is a devicetree node that defines an SPI device on spi2 with chip select 0, max 1 MHz clock, and a generic Zephyr SPI driver.

[higginsa1]

I think I have found the problem, ash on my head! In my build call the prj.conf was bent, so the entries for the SPI were missing.

Sorry for that!

[higginsa1]

Oh man, I didn't think this would be so difficult, I've made some progress, but no data is coming out of the SPI yet. I have now looked at the spi_bitbang and translated it, it crashes on the first send attempt. I still think it is due to the overlay file.

Here is the error message of the serial terminal

[00:00:00.000,000] os: ***** BUS FAULT *****
[00:00:00.000,000] os: Precise data bus error
[00:00:00.000,000] os: BFAR Address: 0x4
[00:00:00.000,000] os: r0/a1: 0x40000000 r1/a2: 0x00000000 r2/a3: 0x00000009
[00:00:00.000,000] os: r3/a4: 0x00000000 r12/ip: 0x08006d8c r14/lr: 0x08003223
[00:00:00.000,000] os: xpsr: 0x89000000
[00:00:00.000,000] os: Faulting instruction address (r15/pc): 0x08003266
[00:00:00.000,000] os: >>> ZEPHYR FATAL ERROR 25: Unknown error on CPU 0
[00:00:00.000,000] os: Current thread: 0x20000680 (unknown)
[00:00:00.000,000] os: Halting system

This is caused by the call int ret = spi_write(dev, &config, &tx_bufs);

prj.conf
CONFIG_GPIO=y
CONFIG_PRINTK=y

CONFIG_SPI=y
CONFIG_SPI_STM32=y
CONFIG_SPI_BITBANG=y

CONFIG_STDOUT_CONSOLE=y
CONFIG_LOG=y

overlay

&spi1 {
pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pa7>;
pinctrl-names = "default";
cs-gpios = <&gpioa 0 GPIO_ACTIVE_LOW>; // Chip Select Pin
status = "okay";
};

[JarmouniA]

I have now looked at the spi_bitbang and translated it

@higginsa1 What do you mean by that? what are you trying to do exactly?
Also there is no reason to have both CONFIG_SPI_STM32=y and
CONFIG_SPI_BITBANG=y in your config.
Add CONFIG_SPI_STM32_INTERRUPT=y

See https://docs.zephyrproject.org/latest/doxygen/html/group__spi__interface.html
https://docs.zephyrproject.org/latest/build/dts/api/bindings/spi/st%2Cstm32-spi.html
https://github.com/zephyrproject-rtos/zephyr/tree/main/tests/drivers/spi/spi_controller_peripheral
https://github.com/zephyrproject-rtos/zephyr/blob/main/tests/drivers/spi/spi_loopback/src/spi.c

[higginsa1]

I took the Bitbang SPI example and merged the proj.conf with mine. I used my overlay file and replaced the node from the example with my spi1.

I tried this with the interrupt, but unfortunately this also crashed.

Note: Unfortunately I don't have a slave connected at home, can it crash because of that? I would have said a clock and CS I would have to see at least once before it detects an error?

proj.conf
CONFIG_GPIO=y
CONFIG_PRINTK=y

CONFIG_SPI=y
CONFIG_SPI_STM32=y
CONFIG_SPI_STM32_INTERRUPT=y

CONFIG_STDOUT_CONSOLE=y
CONFIG_LOG=y

overlay
&spi1 {
pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pa7>;
pinctrl-names = "default";
cs-gpios = <&gpioc 9 GPIO_ACTIVE_LOW>; // Chip Select Pin
status = "okay";
};

ERROR
[00:00:00.000,000] os: ***** BUS FAULT *****
[00:00:00.000,000] os: Precise data bus error
[00:00:00.000,000] os: BFAR Address: 0x4
[00:00:00.000,000] os: r0/a1: 0x40000000 r1/a2: 0x00000000 r2/a3: 0x00000009
[00:00:00.000,000] os: r3/a4: 0x00000000 r12/ip: 0x08006ed8 r14/lr: 0x08003299
[00:00:00.000,000] os: xpsr: 0x89000000
[00:00:00.000,000] os: Faulting instruction address (r15/pc): 0x080032e0
[00:00:00.000,000] os: >>> ZEPHYR FATAL ERROR 25: Unknown error on CPU 0
[00:00:00.000,000] os: Current thread: 0x20000680 (unknown)
[00:00:00.000,000] os: Halting system