RE: [nRF5340 TWI ] Access two sensors separetly on same TWI

Augustin Bricout — Wed, 01 Feb 2023 18:38:29 GMT

Alright it works,

Thank you very much

RE: [nRF5340 TWI ] Access two sensors separetly on same TWI

Naeem Maroof — Wed, 01 Feb 2023 16:01:02 GMT

Hi Augustin,

You can use something similar as below:

void main(void)
{
	int err = 0;

	const struct device *const gpio_pcaA = DEVICE_DT_GET(DT_NODELABEL(pcaalpha));
	const struct device *const gpio_pcaB = DEVICE_DT_GET(DT_NODELABEL(pcabravo));

	if (!gpio_pcaA) {
		printk("\nError initialization Alpha PCA"); return;
	}
	
	if (!gpio_pcaB) {
		printk("\nError initialization Bravo PCA"); return;
	}

	printk("%s PCA initialized on ! %s\n", gpio_pcaA->name, CONFIG_BOARD);
	printk("%s PCA initialized on ! %s\n", gpio_pcaB->name, CONFIG_BOARD);

}

Please note that I have changed the sub-node names in the device overlay as (also some minor modifications):

&i2c0 {
    compatible = "nordic,nrf-twim";
    status = "okay";
    pinctrl-0 = <&i2c0_default>;
    pinctrl-1 = <&i2c0_sleep>;
    pinctrl-names = "default", "sleep";
    pcaAlpha: pcaAlpha@20 {
        compatible = "nxp,pca95xx";
        #gpio-cells = <2>;
        gpio-controller;
        reg = <0x20 >;
        ngpios = < 16 >;
        interrupt-gpios = <&gpio0 9 (GPIO_ACTIVE_LOW)>;
        label = "pcaAlpha";
    };
    pcaBravo: pcaBravo@21 {
        compatible = "nxp,pca95xx";
        #gpio-cells = <2>;
        gpio-controller;
        reg = <0x21 >;
        ngpios = < 16 >;
        interrupt-gpios = <&gpio0 9 (GPIO_ACTIVE_LOW)>;        
        label = "pcaBravo";
    };
};

Tested it on 52840

Hope it helps,

Naeem