How to I2C

Question

Hello,

I want to control a CODEC via I2C.

I implemented the software following the DevAcademy below.

I2C Driver – Nordic Developer Academy (nordicsemi.com)

But I get the following build error:

C:\ncs\v2.3.0\zephyr\include\zephyr\device.h:83:41: error: '__device_dts_ord_134' undeclared here (not in a function); did you mean '__device_dts_ord_13'?

I implemented the source code as follows.

1) prj.conf

CONFIG_I2C=y

2) nrf5340dk_nrf5340_cpuapp.overlay

&i2c2 {
    mycodec: mycodec@1a{
        compatible = "i2c-device";
        reg = < 0x1a >;
        label = "MYCODEC";
        status = "okay";
        sda-pin = < 0x23 >;
        scl-pin = < 0x22 >;
    };
};

3) main.c

#include <zephyr/drivers/i2c.h>

#define I2C2_NODE DT_NODELABEL(mycodec)

static const struct i2c_dt_spec dev_i2c = I2C_DT_SPEC_GET(I2C2_NODE);

void main(void)
{
	if (!device_is_ready(dev_i2c.bus))
	{
		printk("I2C bus %s is not ready!\n\r",dev_i2c.bus->name);
	}

    while(1);
}

How do I resolve this build error?

Hardware: nRF5340 (custom board)

Software: NCS v2.3.0

IDE: VS Code v1.77.1

Regards,

Gotoda

Håkon Alseth · Accepted Answer

Hi,

Could you try moving "status = "okay";" one step up?

&i2cX {
    status = "okay";
    ...
};

Also, since you are using ncs v2.x, you should use pinctrl for defining your pins. Here's an example of using I2C1, with P1.02/P1.03 as the pinout:

&pinctrl {
	i2c1_default: i2c1_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
				<NRF_PSEL(TWIM_SCL, 1, 3)>;
		};
	};

	i2c1_sleep: i2c1_sleep {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
				<NRF_PSEL(TWIM_SCL, 1, 3)>;
			low-power-enable;
		};
	};
};

&i2c1 {
	compatible = "nordic,nrf-twim";
	status = "okay";
	pinctrl-0 = <&i2c1_default>;
	pinctrl-1 = <&i2c1_sleep>;
	...
};

Kind regards,

Håkon

How to I2C

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