NCS SDK 2.7.0 uses I2C(SCL P0.10, SDA P0.09 ) failed

RE: NCS SDK 2.7.0 uses I2C(SCL P0.10, SDA P0.09 ) failed

Einar Thorsrud — Tue, 03 Dec 2024 15:18:55 GMT

Hi,

I see. If you use the exact same configuration that worked on another board just with different pins, that should work here as well not that you have configures the NFC pins to function as GPIOs.. Can you measure the SDA and SCL lines with a logic analyzer so that we see the signals (if there is any clock and data, and if so, what it looks like)?

RE: NCS SDK 2.7.0 uses I2C(SCL P0.10, SDA P0.09 ) failed

hugh512 — Mon, 02 Dec 2024 15:35:02 GMT

I got same error, below is the schematic about I2C, It's

&pinctrl {
	i2c0_default: i2c0_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SCL, 0, 10)>, <NRF_PSEL(TWIM_SDA, 0, 9)>;
			bias-pull-up;
		};
	};

	spi1_default: spi1_default {
		group1 {
			psels = <NRF_PSEL(SPIM_MISO, 0, 14)>,
					<NRF_PSEL(SPIM_MOSI, 0, 15)>,
					<NRF_PSEL(SPIM_SCK, 0, 17)>;
		};
	};
};

Another project, I uses P0.07 & P0.08, I2C works properly

&i2c0 {
	status = "okay";
	pinctrl-0 = <&i2c0_default>;
	pinctrl-names = "default";
	clock-frequency = <I2C_BITRATE_STANDARD>;
	max77734:max77734@48 {
		compatible = "i2c-device";
		reg = <0x48>;
	};
};

&pinctrl {
	i2c0_default: i2c0_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SCL, 0, 7)>, <NRF_PSEL(TWIM_SDA, 0, 8)>;
		};
	};
};

RE: NCS SDK 2.7.0 uses I2C(SCL P0.10, SDA P0.09 ) failed

Einar Thorsrud — Mon, 02 Dec 2024 15:02:06 GMT

Hi,

I see. It look slike you are also missing pullup configurations, unless you have external pull resistors? See this post.

RE: NCS SDK 2.7.0 uses I2C(SCL P0.10, SDA P0.09 ) failed

hugh512 — Mon, 02 Dec 2024 14:45:24 GMT

I still get below exception:

Process: JLink.exe
[00:00:00.000,793] <inf> PHOENIX_IS31Fl3235A: I2C bus i2c@40003000 is ready!

[00:00:00.001,037] <err> PHOENIX_IS31Fl3235A: Could not write to I2C device mcu1

[00:00:00.001,098] <inf> main: Battery value: 9464
[00:00:00.001,159] <inf> main: MCU1 value: 404
[00:00:00.001,190] <inf> main: MCU2 value: 392

my dts file

&i2c0 {
	status = "okay";
	pinctrl-0 = <&i2c0_default>;
	pinctrl-names = "default";
	clock-frequency = <I2C_BITRATE_STANDARD>;
	is31fl3235a_part1: is31fl3235a_part1@78 {
		compatible = "i2c-device";
		reg = <0x78>;
		status = "okay";
	};
	// is31fl3235a_part2: is31fl3235a_part2@7B {
	// 	compatible = "i2c-device";
	// 	reg = <0x7B>;
	// 	status = "okay";
	// };
};

&uicr {
	nfct-pins-as-gpios;
};

&pinctrl {
	i2c0_default: i2c0_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SCL, 0, 10)>, <NRF_PSEL(TWIM_SDA, 0, 9)>;
		};
	};

	spi1_default: spi1_default {
		group1 {
			psels = <NRF_PSEL(SPIM_MISO, 0, 14)>,
					<NRF_PSEL(SPIM_MOSI, 0, 15)>,
					<NRF_PSEL(SPIM_SCK, 0, 17)>;
		};
	};
};

my c file

#define IS31FL3235A_REG_SHUTDOWN 0x00
#define IS31FL3235A_REG_GBL_CTL 0x4A
#define IS31FL3235A_REG_OUT_FREQ 0x4B
#define IS31FL3235A_REG_RST 0x4F

#define MCU1_NODE DT_NODELABEL(is31fl3235a_part1)

static const struct i2c_dt_spec mcu1_i2c = I2C_DT_SPEC_GET(MCU1_NODE);

// init
int is31fl3235a_init();

int is31fl3235a_init() {
    int err;
    if (!device_is_ready(mcu1_i2c.bus)) {
        LOG_ERR("I2C bus %s is not ready!\n\r", mcu1_i2c.bus->name);
        return -1;
    } else {
        LOG_INF("I2C bus %s is ready!\n\r", mcu1_i2c.bus->name);
    }

    uint8_t config[2] = {IS31FL3235A_REG_SHUTDOWN, 0x01};
    err = i2c_write_dt(&mcu1_i2c, config, sizeof(config));
    if (err < 0) {
        LOG_ERR("Could not write to I2C device %s\n\r", "mcu1");
        return -1;
    }


    return 0;
}

RE: NCS SDK 2.7.0 uses I2C(SCL P0.10, SDA P0.09 ) failed

Einar Thorsrud — Mon, 02 Dec 2024 14:10:51 GMT

Hi,

To use the NFCT pins as GPIO's without needing additional steps you can add this to your board files or an overlay file:

	  &uicr {
	      nfct-pins-as-gpios;
	  };

RE: NCS SDK 2.7.0 uses I2C(SCL P0.10, SDA P0.09 ) failed

hugh512 — Sat, 30 Nov 2024 13:23:49 GMT

I uses below commands to set NFCPINS to gpio, but I still got the I2C write exception, Any other things need to configure?

> nrfjprog --memrd 0x1000120C
0x1000120C: FFFFFFFF                              |....|
> nrfjprog --memwr 0x4001E504 --val 1
Parsing parameters.
Writing.
> nrfjprog --memwr 0x1000120C --val 0
Parsing parameters.
Writing.
> nrfjprog --reset
Applying system reset.
Run.
> nrfjprog --memrd 0x1000120C
0x1000120C: 00000000                              |....|

RE: NCS SDK 2.7.0 uses I2C(SCL P0.10, SDA P0.09 ) failed

Turbo J — Sat, 30 Nov 2024 12:25:31 GMT

Read the PS. Those pins need to be configured in UICR in order to allow them to work as GPIOs.