Weird SPI timings when using Zephyr SPI driver

RE: Weird SPI timings when using Zephyr SPI driver

seneryilmaz — Wed, 17 Nov 2021 06:34:21 GMT

When I used SPIM driver instead of SPI, time intervals between bytes are disappeared.

RE: Weird SPI timings when using Zephyr SPI driver

Sigurd — Mon, 01 Nov 2021 08:07:39 GMT

I was not able to reproduce this. I tested on a nRF52840DK.

Here is the code I used:
devzone.nordicsemi.com/.../2465.spi.zip

RE: Weird SPI timings when using Zephyr SPI driver

seneryilmaz — Tue, 26 Oct 2021 10:58:54 GMT

1) NRF52840 (PCA10059 Dongle)

const struct device *spi_device = device_get_binding(DT_LABEL(SPI));
if(spi_device == NULL)
{
    while(1)
    {
        gpio_pin_set(dev1, PIN1, (int)led_is_on);
        led_is_on = !led_is_on;
        k_msleep(100);
    }
}

struct spi_cs_control cs_control;
cs_control.gpio_dev = DEVICE_DT_GET(DT_NODELABEL(gpio0));
cs_control.delay = 1;
cs_control.gpio_pin = 13;
cs_control.gpio_dt_flags = GPIO_ACTIVE_LOW;

struct spi_config config;
config.frequency = 16000000U;
config.operation = SPI_WORD_SET(8) | SPI_TRANSFER_MSB | SPI_OP_MODE_MASTER;
config.slave = 0;
config.cs = &cs_control;

struct spi_buf spi_tx_buf;
spi_tx_buf.buf = spi_tx_message;
spi_tx_buf.len = strlen(spi_tx_message);

struct spi_buf_set spi_tx_buf_set;
spi_tx_buf_set.buffers = &spi_tx_buf;
spi_tx_buf_set.count = 1;

gpio_pin_set(dev0, PIN0, 0);
gpio_pin_set(dev1, PIN1, 0);

while(1)
{
    int ret_func = spi_write(spi_device, &config, &spi_tx_buf_set);
    if(ret_func == 0)
    {
        gpio_pin_set(dev0, PIN0, (int)led_is_on);
    }
    else
    {
        gpio_pin_set(dev1, PIN1, (int)led_is_on);
    }
    led_is_on = !led_is_on;
    k_msleep(SLEEP_TIME_MS);
}

3) The latest release version which is 1.7.0

RE: Weird SPI timings when using Zephyr SPI driver

Sigurd — Tue, 26 Oct 2021 10:54:41 GMT

Hi,

1) What device are you using? nRF51, nRF52832, nRF52840, nRF5340, nRF9160, etc?

2) Do you have some code snippets or simple example code that you used to test this, that you can share?

3) What version of nRF Connect SDK(NCS) did you use?