i2c communication not working in ncs but working on nrf5 sdk

[Gaurav]

I have tried all the configs on device tree to make the sensor work reliably, but it fails. Like I have LSM6DSOX as IMU and it works for sometime and then On power on reset , device starts to show as not ready 

device_is_ready(lsm_i2c.bus) this fails.

Providing config files and schematic of the SDA and SCL line-

&i2c0 {
    lsm6dsox: lsm6dsox@6A {
		compatible = "st,lsm6dso";
		reg = <0x6A>;
    };
	stc3117: stc3117@70 {
		compatible = "i2c-device";
		reg = <0x70>;
	};
	mlx60732: mlx60732@3A {
		compatible = "i2c-device";
		reg = <0x3A>;
	};
};

&i2c1 {
	status = "okay";
	maxm86161: maxm86161@62 {
		compatible = "i2c-device";
		reg = <0x62>;
	};
};

And this is pin ctrl config for the same -

/*
 * Copyright (c) 2022 Nordic Semiconductor
 * SPDX-License-Identifier: Apache-2.0
 */

&pinctrl {
	uart0_default: uart0_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 6)>,
				<NRF_PSEL(UART_RTS, 0, 5)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 0, 8)>,
				<NRF_PSEL(UART_CTS, 0, 7)>;
			bias-pull-up;
		};
	};

	uart0_sleep: uart0_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 6)>,
				<NRF_PSEL(UART_RX, 0, 8)>,
				<NRF_PSEL(UART_RTS, 0, 5)>,
				<NRF_PSEL(UART_CTS, 0, 7)>;
			low-power-enable;
		};
	};

	uart1_default: uart1_default {
		group1 {
			psels = <NRF_PSEL(UART_RX, 1, 1)>;
			bias-pull-up;
		};
		group2 {
			psels = <NRF_PSEL(UART_TX, 1, 2)>;
		};
	};

	uart1_sleep: uart1_sleep {
		group1 {
			psels = <NRF_PSEL(UART_RX, 1, 1)>,
				<NRF_PSEL(UART_TX, 1, 2)>;
			low-power-enable;
		};
	};

	i2c0_default: i2c0_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 0, 27)>,
				<NRF_PSEL(TWIM_SCL, 0, 26)>;
			bias-disable;	
		};
	};

	i2c0_sleep: i2c0_sleep {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 0, 27)>,
				<NRF_PSEL(TWIM_SCL, 0, 26)>;
			bias-disable;	
			low-power-enable;
		};
	};

	i2c1_default: i2c1_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 0, 25)>,
				<NRF_PSEL(TWIM_SCL, 0, 24)>;
			bias-disable;	
		};
	};

	i2c1_sleep: i2c1_sleep {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 0, 25)>,
				<NRF_PSEL(TWIM_SCL, 0, 24)>;
			bias-disable;
			low-power-enable;
		};
	};

	pwm0_default: pwm0_default {
		group1 {
			psels = <NRF_PSEL(PWM_OUT0, 0, 13)>;
			nordic,invert;
		};
	};

	pwm0_sleep: pwm0_sleep {
		group1 {
			psels = <NRF_PSEL(PWM_OUT0, 0, 13)>;
			low-power-enable;
		};
	};

	spi0_default: spi0_default {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 27)>,
				<NRF_PSEL(SPIM_MOSI, 0, 26)>,
				<NRF_PSEL(SPIM_MISO, 0, 29)>;
		};
	};

	spi0_sleep: spi0_sleep {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 27)>,
				<NRF_PSEL(SPIM_MOSI, 0, 26)>,
				<NRF_PSEL(SPIM_MISO, 0, 29)>;
			low-power-enable;
		};
	};

	spi1_default: spi1_default {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 31)>,
				<NRF_PSEL(SPIM_MOSI, 0, 30)>,
				<NRF_PSEL(SPIM_MISO, 1, 8)>;
		};
	};

	spi1_sleep: spi1_sleep {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 31)>,
				<NRF_PSEL(SPIM_MOSI, 0, 30)>,
				<NRF_PSEL(SPIM_MISO, 1, 8)>;
			low-power-enable;
		};
	};

	spi2_default: spi2_default {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 19)>,
				<NRF_PSEL(SPIM_MOSI, 0, 20)>,
				<NRF_PSEL(SPIM_MISO, 0, 21)>;
		};
	};

	spi2_sleep: spi2_sleep {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 19)>,
				<NRF_PSEL(SPIM_MOSI, 0, 20)>,
				<NRF_PSEL(SPIM_MISO, 0, 21)>;
			low-power-enable;
		};
	};

	qspi_default: qspi_default {
		group1 {
			psels = <NRF_PSEL(QSPI_SCK, 0, 19)>,
				<NRF_PSEL(QSPI_IO0, 0, 20)>,
				<NRF_PSEL(QSPI_IO1, 0, 21)>,
				<NRF_PSEL(QSPI_IO2, 0, 22)>,
				<NRF_PSEL(QSPI_IO3, 0, 23)>,
				<NRF_PSEL(QSPI_CSN, 0, 17)>;
		};
	};

	qspi_sleep: qspi_sleep {
		group1 {
			psels = <NRF_PSEL(QSPI_SCK, 0, 19)>,
				<NRF_PSEL(QSPI_IO0, 0, 20)>,
				<NRF_PSEL(QSPI_IO1, 0, 21)>,
				<NRF_PSEL(QSPI_IO2, 0, 22)>,
				<NRF_PSEL(QSPI_IO3, 0, 23)>;
			low-power-enable;
		};
		group2 {
			psels = <NRF_PSEL(QSPI_CSN, 0, 17)>;
			low-power-enable;
			bias-pull-up;
		};
	};

	spi3_default: spi3_default {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 1, 15)>,
				<NRF_PSEL(SPIM_MISO, 1, 14)>,
				<NRF_PSEL(SPIM_MOSI, 1, 13)>;
		};
	};

	spi3_sleep: spi3_sleep {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 1, 15)>,
				<NRF_PSEL(SPIM_MISO, 1, 14)>,
				<NRF_PSEL(SPIM_MOSI, 1, 13)>;
			low-power-enable;
		};
	};

};

Strangely there is one more sensor on the same line and that sensor is working properly with this configuration. I have been using the same sensor and same hardware which was working on nrf5 SDK and recently ported the project to NCS 2.2.0.

Please help in resolving this

[Gaurav]

Hi Sigurd Hellesvik 

I have followed dev academy religiously in making this project including i2c.

See if only one sensor out of 4 sensor not working is the problem, on same config others are working and this is not that`s the problem.

I have disable rest of the communication to refrain from pin control conflicts -

&spi0 {
	status = "disabled";
};

&spi1 {
	status = "disabled";
};

&uart0 {
	status = "disabled";
};

&uart1 {
	status = "disabled";
};

But still nothing.

[Gaurav]

Hi Sigurd Hellesvik 

I will come back with logic analyzer result for this.
But can you also see this ticket of mine -

https://devzone.nordicsemi.com/f/nordic-q-a/106994/buffer-overflow-while-using-config_newlib_libc-and-not-able-to-use-math-h-in-my-application

Its quite urgent. Please help

[Gaurav]

 Sigurd Hellesvik Hi

I have solved the issue of LSM not detecting in my board with the config shared.

Main issue was there were other communication protocols which were using the same pins as that of LSM which was causing the issue.

[Gaurav]

Hi Sigurd Hellesvik 

I have got into one more issue with my LSM, on LSM interrupt I am trying to read sensor ID (want to actually read accel raw data on interrupt) and it gets stuck and never recovers but the BLE functionality works.

Not able to find any reason for this to happen. Please help in this

[Gaurav]

00> Interrupt observed 
00> [00:00:07.394,592] <err> i2c_nrfx_twi: i2c_nrfx_twi_transfer: Error on I2C line occurred for message 0
00> LSM int handler : 32
00> Interrupt observed 
00> [00:00:08.328,582] <err> i2c_nrfx_twi: i2c_nrfx_twi_transfer: Error on I2C line occurred for message 0
00> LSM int handler : 32
00> Interrupt observed 
00> [00:00:18.826,965] <err> i2c_nrfx_twi: i2c_nrfx_twi_transfer: Error on I2C line occurred for message 0
00> LSM int handler : 32
00> Interrupt observed 
00> [00:00:20.321,380] <err> i2c_nrfx_twi: i2c_nrfx_twi_transfer: Error on I2C line occurred for message 0
00> LSM int handler : 32
00> Interrupt observed 
00> [00:00:21.255,401] <err> i2c_nrfx_twi: i2c_nrfx_twi_transfer: Error on I2C line occurred for message 0
00> LSM int handler : 32