Interfacing LSM6DS3TR-C with SPI NRF9160

RE: Interfacing LSM6DS3TR-C with SPI NRF9160

Håkon Alseth — Fri, 02 Jun 2023 07:43:05 GMT

Hi,

[quote user="Mindtech"]Follows the signals in the logic analyzer[/quote]

As compared to arduino scope, it looks like your "CS" is actually CLK, and vice-versa. Due to the zoomed out picture, it is not possible to see the potential transactions.

Could you double check your pin-out to see if there's no mismatch there?

Kind regards,

Håkon

RE: Interfacing LSM6DS3TR-C with SPI NRF9160

Mindtech — Thu, 01 Jun 2023 15:08:35 GMT

Sorry for the delay in reply...

Follows the signals in the logic analyzer

The same sensor using Arduino:

RE: Interfacing LSM6DS3TR-C with SPI NRF9160

Håkon Alseth — Thu, 25 May 2023 12:23:34 GMT

Hi,

Could you connect a logic analyzer to the SPI pins and share the result?

Kind regards,

Håkon

RE: Interfacing LSM6DS3TR-C with SPI NRF9160

Mindtech — Wed, 24 May 2023 13:44:13 GMT

Unfortunately I already tried with P0.08/P0.09 in the "NC" position, nothing...

EDIT: Using nRF52833dk i had the same error

RE: Interfacing LSM6DS3TR-C with SPI NRF9160

Håkon Alseth — Wed, 24 May 2023 08:14:07 GMT

Hi,

The pins you're using now overlaps with the pins that are directly connected to the nRF52840 on the nRF9160-DK. Depending on the configuration of the board controller, these GPIOs could be directly connected from nRF9160->nRF52840.

[quote user="Mindtech"]I checked the pins as you recommended and indeed one of them was grounded, [/quote]

If you set the switch 1 and switch 2 in the "NC" position, they should not interfere with the signal on P0.08/P0.09.

I would recommend that you use a logic analyzer to see which GPIOs are toggling.

Kind regards,

Håkon

RE: Interfacing LSM6DS3TR-C with SPI NRF9160

Mindtech — Tue, 23 May 2023 20:45:37 GMT

Hi Håkon,

Thanks for the feedback, unfortunately it's still not working...

I checked the pins as you recommended and indeed one of them was grounded, but I tried switching to other gpios and still didn't get any results...

/ {
	aliases {
		lsm6dsl1 = &lsm6dsl1;
	};
};

&pinctrl {
    spi1_default: spi1_default {
		group1 {
			psels = < NRF_PSEL(SPIM_SCK, 0, 19) >,
					<NRF_PSEL(SPIM_MOSI, 0, 18)>,
					<NRF_PSEL(SPIM_MISO, 0, 21)>;
		};
	};

	spi1_sleep: spi1_sleep {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 19)>,
					<NRF_PSEL(SPIM_MOSI, 0, 18)>,
					<NRF_PSEL(SPIM_MISO, 0, 21)>;
			low-power-enable;
		};
	};
};

&spi1 {
    compatible = "nordic,nrf-spim";
    status = "okay";
    pinctrl-0 = <&spi1_default>;
    pinctrl-1 = <&spi1_sleep>;
    pinctrl-names = "default", "sleep";
	cs-gpios = < &gpio0 17 GPIO_ACTIVE_LOW >;
    lsm6dsl1: lsm6dsl@0 {
		compatible = "st,lsm6dsl";
		status = "okay";
		reg = <0x0>;
		spi-max-frequency = <10000000>;
		irq-gpios = < &gpio0 22 GPIO_ACTIVE_LOW >;
	};
};

&spi3 {
	status = "disabled";
};

I'm trying to get the signals on the oscilloscope to see if the behavior of the spi is visible, but still nothing.

I tested the sensor on an arduino and it worked normally, so it's something I'm missing on the nRf9160.

Any more suggestions?

RE: Interfacing LSM6DS3TR-C with SPI NRF9160

Håkon Alseth — Tue, 23 May 2023 12:22:36 GMT

Hi,

P0.11 goes to the external memory on the nRF9160-DK.

P0.08/P0.09 goes to the switches, so depending on their position, those GPIOs can potentially be grounded

See here for more information: https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/if_connector.html?cp=2_0_4_3_5

I would recommend that you probe these pins to see if they behave as expected.

Kind regards,

Håkon