nrf52811 in SPI slave mode

RE: nrf52811 in SPI slave mode

Jørgen Holmefjord — Wed, 28 Feb 2024 14:38:31 GMT

Can you upload your generated devicetree file (build/zephyr/zephyr.dts)? This should show if the pin configs are included correctly in the project.

Did you check the pins with a logic analyzer/scope, to see if some/all pins are toggling as expected? If CS/SCK/MOSI toggles correctly, is there any response from the slave on the MISO pin?

RE: nrf52811 in SPI slave mode

PRAVIN_@yash — Tue, 27 Feb 2024 10:41:00 GMT

i added &uicr in my devicetree but still the control not comes to spi_slave_write_test_msg() function

signaled value is 0 always

did i configure pinctrl.dtsi file correct?

did you find anything wrong in code ?

RE: nrf52811 in SPI slave mode

Jørgen Holmefjord — Tue, 27 Feb 2024 10:23:35 GMT

Hi,

GPIOs P0.09 and P0.10 are by default assigned to the NFCT peripherals, as these are the dedicated antenna pins. To use these as GPIOs, you need to configure this in your devicetree:

&uicr {
    nfct-pins-as-gpios;
};

Best regards,
Jørgen

RE: nrf52811 in SPI slave mode

PRAVIN_@yash — Mon, 26 Feb 2024 16:31:11 GMT

Hello,

I am able to resolve the error.

i am not able to get control at

spi_slave_write_test_msg()

The master code is tested and is working with NRF52811 in slave mode using NRFX_SPI_DRIVER

In master code, SPI mode 0 is used with 1MHz frequency

what could be the wrong in dts file or main file

My SPI slave configuration is:

SPIS_SCK = p0.6
SPIS_MOSI= p0.9

SPIS_MISO = P0.10
SPIS_CSN = P0.12

devzone.nordicsemi.com/.../5684.main.c devzone.nordicsemi.com/.../emg_5F00_nrf52811_2D00_pinctrl.dtsi devzone.nordicsemi.com/.../emg_5F00_nrf52811.dts devzone.nordicsemi.com/.../6254.prj.conf

RE: nrf52811 in SPI slave mode

Jørgen Holmefjord — Mon, 26 Feb 2024 13:34:23 GMT

Hi,

From the error message, it looks like the pins are not configured for the SPIS in your devicetree. When using the Zephyr driver, you will need to define the pins in devicetree/overlay,

Can you post the overlay file you are using when building your project?

Best regards,
Jørgen

RE: nrf52811 in SPI slave mode

PRAVIN_@yash — Sun, 25 Feb 2024 17:06:26 GMT

Hello,

i am using zephyr driver to configure SPI peripheral in slave mode

I am getting an build error for above configuration (pinctrl.dtsi) and dts file

what are the configuration missed here ?

I am using custom board having spi interface only

C:/ncs/v2.5.2/zephyr/include/zephyr/drivers/pinctrl.h:348: undefined reference to `pinctrl_lookup_state'

c:/ncs/toolchains/c57af46cb7/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd.exe: zephyr/drivers/spi/libdrivers__spi.a(spi_nrfx_spis.c.obj): in function `pinctrl_apply_state_direct':

C:/ncs/v2.5.2/zephyr/include/zephyr/drivers/pinctrl.h:329: undefined reference to `pinctrl_configure_pins'

collect2.exe: error: ld returned 1 exit status

ninja: build stopped: subcommand failed.

FAILED: images/EMG_APP-prefix/src/EMG_APP-stamp/EMG_APP-build

FATAL ERROR: command exited with status 1:

RE: nrf52811 in SPI slave mode

Jørgen Holmefjord — Thu, 22 Feb 2024 15:12:52 GMT

Hi,

[quote user=""]1. CS pin whether i can use cs pin in pinctrl file or i have to use it as a gpio? if yes how to configure it (GPIO PIN or GPIOTE pin) [/quote]

The CS pin must be assigned in the SPIS HW peripheral when the SPI Master initiates a transfer, see the description of SPI slave operation in the nRF52811 Product Specifications.

If you are using the nrfx_spis driver to configure the SPIS peripheral, it is not required to configure the CS pin in the devicetree/pinctrl, since the pin is set in the driver configuration struct. The devicetree/pinctrl nodes is used when Zephyr drivers are used to configure the peripheral.

If you have control of both sides of the SPI bus, you can technically configure the CS pin as a GPIO interrupt and send a "dummy" packet from the SPI Master to tell the slave to initialize the SPIS peripheral, but the current consumption by SPIS when CS pin is not asserted should not be quite low.

[quote user=""]2. how to enable interrupt in spi slave mode to detect master has sent data[/quote]

When you are using the nrfx_spis driver, the driver should enable the appropriate interrupts for you. Once a transfer have been completed, the driver will pass an event to the application event handler that was set during initialization.

Best regards,
Jørgen