Can we use the same SPI bus for the External flash memory and nRF7000 communication?

[Roman Veselskyi]

Hello,

We have a custom PCB that includes an nRF9160 and nRF7000. We’re planning a hardware update to add external flash memory and would like to know if we can use the same SPI bus that’s currently being used for the nRF7000’s communication.

Thank you!

[Roman Veselskyi]

Hello Amanda,

I receive the Thingy91X and check it thingy91x_common.dtsi and there are 3 devices on one SPI bus nrf70, external flash and bmi270

&spi3 {
	compatible = "nordic,nrf-spim";
	status = "disabled";

	pinctrl-0 = <&spi3_default>;
	pinctrl-1 = <&spi3_sleep>;
	pinctrl-names = "default", "sleep";

	flash_ext: GD25LE255E@0 {
		compatible = "jedec,spi-nor";
		status = "disabled";
		reg = <0>;
		spi-max-frequency = <8000000>;
		size = <268435456>;
		has-dpd;
		t-enter-dpd = <3000>;
		t-exit-dpd = <20000>;
		sfdp-bfp = [e5 20 f3 ff  ff ff ff 0f  44 eb 08 6b  08 3b 42 bb
			    fe ff ff ff  ff ff 00 ff  ff ff 42 eb  0c 20 0f 52
			    10 d8 00 ff  d4 31 a5 fe  84 df 14 4f  ec 62 16 33
			    7a 75 7a 75  04 b3 d5 5c  19 06 14 00  08 50 00 01];
		jedec-id = [c8 60 19];
	};

	nrf70: wifi@1 {
		compatible = "nordic,nrf7002-spi";
		status = "disabled";
		reg = <1>;
		spi-max-frequency = <DT_FREQ_M(8)>;

		iovdd-ctrl-gpios = <&gpio0 4 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
		bucken-gpios = <&gpio0 7 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
		host-irq-gpios = <&gpio0 5 GPIO_ACTIVE_HIGH>;

		nordic_wlan0: wlan0 {
			compatible = "nordic,wlan";
		};

		wifi-max-tx-pwr-2g-dsss = <21>;
		wifi-max-tx-pwr-2g-mcs0 = <16>;
		wifi-max-tx-pwr-2g-mcs7 = <16>;
		wifi-max-tx-pwr-5g-low-mcs0 = <9>;
		wifi-max-tx-pwr-5g-low-mcs7 = <9>;
		wifi-max-tx-pwr-5g-mid-mcs0 = <11>;
		wifi-max-tx-pwr-5g-mid-mcs7 = <11>;
		wifi-max-tx-pwr-5g-high-mcs0 = <13>;
		wifi-max-tx-pwr-5g-high-mcs7 = <13>;
	};

	accelerometer_hp: bmi270@2 {
		compatible = "bosch,bmi270";
		status = "disabled";
		reg = <2>;
		spi-max-frequency = <DT_FREQ_M(10)>;
	};
};

Does this mean that you fix the driver or that if enable nrf70 then we can't use external flash and 

bmi270?

[Amanda Hsieh]

We still only support nRF7002 on its own SPI. The Thingy91X is a bit special in the sense that you can use SPI from either the nRF9151 or nRF5340 side.