RE: nRF Connect SDK implement i2c mux

ekidsalan123 — Tue, 25 Jun 2024 00:33:53 GMT

Hi,

What devices you are using after TCA9548A? As I know, if you correctly build your devicetree, you can interface with the device after I2C Mux directly.

Here's part of my devicetree

&i2c1 {
	status = "okay";
    pinctrl-0 = <&i2c1_default>;
	pinctrl-1 = <&i2c1_sleep>;
	pinctrl-names = "default", "sleep";
	label = "I2C_1";
	mux: tca9548a@70 {
		compatible = "ti,tca9548a";
		reg = <0x70>;
		status = "okay";
		#address-cells = <1>;
		#size-cells = <0>;

        ch0: mux_i2c@0 {
            compatible = "ti,tca9548a-channel";
            label = "i2c1_mux_0";
            reg = <0x0>;
            status = "okay";
            #address-cells = <0x1>;
            #size-cells = <0x0>;

            as5600_0: as5600@36 {
                compatible = "ams,as5600";
                reg = <0x36 >;
                label = "AS5600_0";
                status = "okay";
            };
        };

        ch1: mux_i2c@1 {
            compatible = "ti,tca9548a-channel";
            label = "i2c1_mux_1";
            reg = <0x1>;
            status = "okay";
            #address-cells = <0x1>;
            #size-cells = <0x0>;

            as5600_1: as5600@36 {
                compatible = "ams,as5600";
                reg = <0x36 >;
                label = "AS5600_1";
                status = "okay";
            };
        };
	};
};

And I could access my AS5600 sensor with following code

K_SEM_DEFINE(as5600_init_ok, 0, 1);

#define AS5600_NODE_0 DT_NODELABEL(as5600_0)

static const struct i2c_dt_spec dev_as5600_0 = I2C_DT_SPEC_GET(AS5600_NODE_0);

uint8_t as5600_0_interface_iic_init(void)
{
    if (!device_is_ready(dev_as5600_0.bus))
    {
        printk("I2C bus %s is not ready!\n\r", dev_as5600_0.bus->name);
        return 1;
    }

    return 0;
}

uint8_t as5600_0_interface_iic_deinit(void)
{

    return 0;
}

uint8_t as5600_0_interface_iic_read(uint8_t addr, uint8_t reg, uint8_t *buf, uint16_t len)
{
    int ret;
    ret = i2c_burst_read_dt(&dev_as5600_0, reg, buf, len);
    if (ret != 0)
    {
        printk("Failed to read to I2C device address 0x%c at Reg. 0x%c\n", dev_as5600_0.addr, reg);
        return 1;
    }
    return 0;
}

uint8_t as5600_0_interface_iic_write(uint8_t addr, uint8_t reg, uint8_t *buf, uint16_t len)
{
    int ret;
    char buff1[] = {reg, buf};
    ret = i2c_write_dt(&dev_as5600_0, buff1, sizeof(buff1));
    if (ret != 0)
    {
        printk("Failed to write to I2C device address 0x%c at Reg. 0x%c\n", dev_as5600_0.addr, reg);
        return 1;
    }
    return 0;
}

void as5600_interface_delay_ms(uint32_t ms)
{
    k_msleep(ms);
}

void as5600_interface_debug_print(const char *const fmt, ...)
{
    va_list args;
    va_start(args, fmt);
    vprintk(fmt, args);
    va_end(args);
}

static as5600_handle_t gs_handle_ch0; /**< as5600 handle */

uint8_t as5600_ch0_init(void)
{
    uint8_t res;

    /* link interface function */
    DRIVER_AS5600_LINK_INIT(&gs_handle_ch0, as5600_handle_t);
    DRIVER_AS5600_LINK_IIC_INIT(&gs_handle_ch0, as5600_0_interface_iic_init);
    DRIVER_AS5600_LINK_IIC_DEINIT(&gs_handle_ch0, as5600_0_interface_iic_deinit);
    DRIVER_AS5600_LINK_IIC_READ(&gs_handle_ch0, as5600_0_interface_iic_read);
    DRIVER_AS5600_LINK_IIC_WRITE(&gs_handle_ch0, as5600_0_interface_iic_write);
    DRIVER_AS5600_LINK_DELAY_MS(&gs_handle_ch0, as5600_interface_delay_ms);
    DRIVER_AS5600_LINK_DEBUG_PRINT(&gs_handle_ch0, as5600_interface_debug_print);

    /* as5600 init */
    res = as5600_init(&gs_handle_ch0);
    if (res != 0)
    {
        as5600_interface_debug_print("as5600_ch0: init failed.\n");

        return 1;
    }

    return 0;
}

uint8_t as5600_ch0_read(float *angle)
{
    uint8_t res;
    uint16_t angle_raw;

    /* read data */
    res = as5600_read(&gs_handle_ch0, &angle_raw, angle);
    if (res != 0)
    {
        as5600_interface_debug_print("as5600_ch0: read failed.\n");

        return 1;
    }

    return 0;
}

uint8_t as5600_ch0_deinit(void)
{
    /* close as5600 */
    if (as5600_deinit(&gs_handle_ch0) != 0)
    {
        return 1;
    }
    else
    {
        return 0;
    }
}

Please have a look if this could help you.

RE: nRF Connect SDK implement i2c mux

Nyameaama — Mon, 24 Jun 2024 14:23:09 GMT

Hello, yes I had the same exact problems with the devicetree where the child node of the TCA9548A was throwing unrecognized errors and I could not interface my sensors. I still couldn't figure out the device tree no matter what I tried so I disregarded it entirely and I interfaced the TCA9548A the programmatic way by writing my own driver for it, and referenced the mux i2c0 bus directly. I used i2c_write_read() instead of i2c_write_read_dt() so the implementation is more akin to hardware definitions in other SDKs. Thanks for your reply!

RE: nRF Connect SDK implement i2c mux

ekidsalan123 — Mon, 24 Jun 2024 01:13:13 GMT

Hello, I was away over the weekend. Did you encounter the same error message? Please upload your screenshot or related files, and I'll try to assist you with your issue.

RE: nRF Connect SDK implement i2c mux

Nyameaama — Thu, 20 Jun 2024 18:22:28 GMT

Hello,

Can you say how you figured it out? Im currently having the same problem

RE: nRF Connect SDK implement i2c mux

ekidsalan123 — Fri, 15 Mar 2024 04:10:31 GMT

Hello Jørgen,

Sorry for the late reply, I didn't notice there's a test code in SDK.

By following the sample, I figure it out and get my code work now, thank you.

RE: nRF Connect SDK implement i2c mux

Jørgen Holmefjord — Tue, 12 Mar 2024 15:28:56 GMT

Hi,

Which version of the nRF Connect SDK are you using? Your devicetree looks quite similar to the test case overlay file.

Can you provide a full sample that can be used to reproduce/debug this?

Best regards,
Jørgen