nRF5340 1-wire EEPROM

..... 1 day ago

Hello,

I have nrf5340dk and AT21CS01-STUM10-T module. This is EEPROM module. I want to communicate with it by 1-wire.
The problem is that I don't know how to do it. I looked through examples in SDK and DevZone but didn't find anything helpful for me. I found an example with 1-wire in the SDK (v2.8.0), but there is very short code in it and there is no overlay for Nordic board. I see that this example uses the w1 driver. When I looked at the w1.h file, I saw functions for writing and reading, but I didn't try them because I don't know how .overlay file for 1-wire should look like.

Can you help me with it ?

Best Regards

Parents

0 Håkon Alseth 16 hours ago

Hi,

Zephyr has a 1-wire scanner sample available here:

https://docs.zephyrproject.org/latest/samples/drivers/w1/scanner/README.html#w1-scanner

You can setup a overlay for your board similar to this:

&uart1 {
	status = "okay";
	current-speed = <115200>;
	pinctrl-0 = <&uart1_default>;
	pinctrl-1 = <&uart1_sleep>;
	pinctrl-names = "default", "sleep";
	w1: w1 {
		compatible = "zephyr,w1-serial";
	};    
};

&pinctrl {
	uart1_default: uart1_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 9)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 1, 8)>;
			bias-pull-up;
		};
	};
	uart1_sleep: uart1_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 9)>,
				<NRF_PSEL(UART_RX, 1, 8)>;
			low-power-enable;
		};
	};    
};

Feel free to change the pinout to your liking.

Kind regards,

Håkon

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