SPI with Mesh Sensor Example

[David Carlin]

Hello!

I have added a UART and I2C to the Mesh Sensor Server example and on a custom NRF52840 board everything works fine.

Today I tried to add SPI without success.

When I downloaded and built the ncs-spi-master-slave-example I get similar issues. The program crashes with the output shown in the screen shots. It seems to be interrupt related. I would be happy to use a SPI Master async or blocking function but can not seem to get that right either.

Please provide an example or suggestions for sending a few bytes to a SPI sensor and getting the result back in a NRF Connect / Zephyr project. I have a lot of SPI experience but I seem to be missing something here.

Thank you!

Regards,

David Carlin

From ncs-spi-master example

From my Mesh Sensor project:

[Håkon Alseth]

Hi,

The sample you're using:

https://github.com/too1/ncs-spi-master-slave-example/tree/master

Is based on NCS v2.3.0, and does not use _DT for fetching the cs-gpios.

Try applying this patch:

diff --git a/src/main.c b/src/main.c
index d3fc0b5..b3163f8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -24,20 +24,12 @@
 const struct device *spi_dev;
 static struct k_poll_signal spi_done_sig = K_POLL_SIGNAL_INITIALIZER(spi_done_sig);
 
-struct spi_cs_control spim_cs = {
-       .gpio = SPI_CS_GPIOS_DT_SPEC_GET(DT_NODELABEL(reg_my_spi_master)),
-       .delay = 0,
-};
-
 static void spi_init(void)
 {
        spi_dev = DEVICE_DT_GET(MY_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");
-       }
 }
 
 static const struct spi_config spi_cfg = {
@@ -45,7 +37,9 @@ static const struct spi_config spi_cfg = {
                                 SPI_MODE_CPOL | SPI_MODE_CPHA,
        .frequency = 4000000,
        .slave = 0,
-       .cs = &spim_cs,
+       .cs = {
+                       .gpio = GPIO_DT_SPEC_GET(MY_SPI_MASTER, cs_gpios),
+       },
 };
 
 static int spi_write_test_msg(void)

 

In this log:

From my Mesh Sensor project:

You are asserting in sem.c:128, this one specifically:

https://github.com/nrfconnect/sdk-zephyr/blob/v3.4.99-ncs1-1/kernel/sem.c#L128

This could be a side-effect introduced due to the .cs_gpio not properly initialized, but the assert occurs when taking a semaphore from interrupt context. Are you triggering a transfer directly in a GPIO interrupt callback?

 

Kind regards,

Håkon

[David Carlin]

Thank you! And now the Dev Academy has a SPI course that is great. Thank you for the great silicon, tools and support. I am using the SPI seamlessly now.