NRF Connect read from accelerometer using SPI driver directly

RE: NRF Connect read from accelerometer using SPI driver directly

Albrecht Markus Schellenberger — Fri, 05 Aug 2022 11:13:43 GMT

[quote user="JasonR"]I've changed my code to use the pinctrl THANKS again! [/quote]

My pleasure, Jason! I’m glad to hear that you are making progress.

[quote user="JasonR"]It's a useful example but it needs updated to the latest NCS. There's deprecation warnings for gpio_dev for example[/quote]

Please note that this is not an official NCS sample and as stated in its requirements, it currently only supports NCS v1.9.1 (-:

Requirements 

SDK: 

    nRF Connect SDK v1.9.1 

Supported boards: 

    nrf52dk_nrf52832 
    nrf52840dk_nrf52840 
    nrf5340dk_nrf5340_cpuapp

[quote user="JasonR"]I've also noticed a discrepancy in the example overlay files which might be a bug.[/quote]

This actually is not a bug. Referring to the &spi1 devicetree of e.g. the nRF52840DK:

spi1: spi@40004000 {
	compatible = "nordic,nrf-spi";
	#address-cells = < 0x1 >;
	#size-cells = < 0x0 >;
	reg = < 0x40004000 0x1000 >;
	interrupts = < 0x4 0x1 >;
	status = "okay";
	label = "SPI_1";
	pinctrl-0 = < &spi1_default >;
	pinctrl-1 = < &spi1_sleep >;
	pinctrl-names = "default", "sleep";
};

The nRF53/nRF91 & nRF52 series are using different SPI drivers.

Cheers,

Markus

RE: NRF Connect read from accelerometer using SPI driver directly

Jason — Fri, 05 Aug 2022 10:54:40 GMT

Thanks Markus!

I would never have spotted the SPI_OP_MODE_MASTER mistake!

I've changed my code to use the pinctrl THANKS again!

I prefer not to use the sensor/lis2dw12 supplied with zephyr because I already wrote a driver that I'm familiar with.

I've been able to read the WHO_AM_I registter by adapting the "NCS-SPI-Master-Slave-Example" that you linked. So that's great. I'll do the rest today I hope,

It's a useful example but it needs updated to the latest NCS. There's deprecation warnings for gpio_dev for example

c:\Vigglab\Projects\Doodoody\BTSender_ClipPair\NCS_Firmware\ClipPair\src\LIS2DW12.c:170:3: warning: 'gpio_dev' is deprecated [-Wdeprecated-declarations]
  170 |   spim_cs.gpio_dev = device_get_binding(MY_SPI_MASTER_CS_PORT);

I've also noticed a discrepancy in the example overlay files which might be a bug.

Thanks again for your help

-Jason

RE: NRF Connect read from accelerometer using SPI driver directly

Albrecht Markus Schellenberger — Thu, 04 Aug 2022 13:15:04 GMT

Hello Jason,

#define SPI0_NODE    DT_NODELABEL(lis2dw12)

void spi_init()
{
     static const struct spi_dt_spec dev_spi = SPI_DT_SPEC_GET(SPI0_NODE, SPI_MODE_MASTER, 0);
}

SPI_MODE_MASTER is supposed to be SPI_OP_MODE_MASTER.

// pinctrl-0 = <&spi1>					//do I need this?
// pinctrl-names = "default";

As a matter of fact, from NCS v2.x.x you do. Referring to the Pin control transition chapter of the nRF Connect SDK v2.0.0 migration notes.

reg = <0>;							//what is this?

Assuming you are configuring the peripheral as a master, this line represents the chip-select / numbering of the slaves, see also here.

compatible = "spi-device";

This is not correct and should look like this instead:

compatible = "st,lis2dw12";

If of interest, you can have a look at this SPI sample for your reference.

Cheers,

Markus