Configuring AD4130 through SPI on nRF52dk (nrf52832)

RE: Configuring AD4130 through SPI on nRF52dk (nrf52832)

chrisafitz — Tue, 13 Aug 2024 15:12:44 GMT

Hi Kenneth, the version I have is v2.6.1. The sample application I was trying to copy was pulling from the Nordic dev academy (nRF SDK Connect Intermediate) exercise 1 under the nrf where they connect a BME280 via SPI. Thank you for your response.

RE: Configuring AD4130 through SPI on nRF52dk (nrf52832)

Kenneth — Tue, 13 Aug 2024 08:25:39 GMT

Any way you can share a simple application that we can use to recreate it here? Specify which ncs release you are using at the same time.

Kenneth

RE: Configuring AD4130 through SPI on nRF52dk (nrf52832)

chrisafitz — Mon, 12 Aug 2024 17:29:15 GMT

yes, I went tried switching the compatible string but didn't seem like that solved the issue nor did a pristine build

RE: Configuring AD4130 through SPI on nRF52dk (nrf52832)

chrisafitz — Mon, 12 Aug 2024 17:28:33 GMT

I switched the frequency in my overlay to 4000000 to be in line with he default and this is the result in the zephyr.dts although it is still giving me that "frequency undefined" error when I build:

spi1: spi@40004000 {

compatible = "nordic,nrf-spi";

#address-cells = < 0x1 >;

#size-cells = < 0x0 >;

reg = < 0x40004000 0x1000 >;

interrupts = < 0x4 0x1 >;

max-frequency = < 0x7a1200 >;

easydma-maxcnt-bits = < 0x8 >;

status = "okay";

pinctrl-0 = < &spi1_default >;

pinctrl-1 = < &spi1_sleep >;

pinctrl-names = "default", "sleep";

cs-gpios = < &gpio0 0x19 0x1 >;

ad4130: ad4130@0 {

compatible = "spi-device";

reg = < 0x0 >;

spi-max-frequency = < 0x3d0900 >;

label = "ad4130";

};

RE: Configuring AD4130 through SPI on nRF52dk (nrf52832)

Kenneth — Mon, 12 Aug 2024 11:38:34 GMT

Can you try with compatible = "vnd,spi-device";?

If that doesn't helps, then sometimes is helps to do a --pristine build, or delete the build folder and try again.

Kenneth

RE: Configuring AD4130 through SPI on nRF52dk (nrf52832)

Turbo J — Sun, 11 Aug 2024 09:32:39 GMT

The translation is exactly where you would expect it: In zephyr/drivers/spi/spi_nrfx_spim.c source file.

The code would select the correct frequency code (4 MHz here).

The "undefined" label makes me think something is off in the dts, look at the combined (resulting) dts in build/zephyr. It may not have pulled in your overlay properly.

RE: Configuring AD4130 through SPI on nRF52dk (nrf52832)

hmolesworth — Sat, 10 Aug 2024 18:05:39 GMT

Note 5000000 is not a frequency supported by the nRF52832 SPIM, it will default to 4Mbps:

K125 0x02000000 125 kbps
K250 0x04000000 250 kbps
K500 0x08000000 500 kbps
M1 0x10000000 1 Mbps
M2 0x20000000 2 Mbps
M4 0x40000000 4 Mbps
M8 0x80000000 8 Mbps

If anyone happens to know where the translation is done from spi-max-frequency to SPIM1->FREQUENCY if would be most helpful as I am currently searching ..