i2c_write_dt gives me -EIO

RE: i2c_write_dt gives me -EIO

Einarh — Fri, 03 Mar 2023 10:00:27 GMT

I would guess this has to do with changes you've done to make it compatible with nRF9160, so it would help to see the exact changes you've made.

But since this is a new issue could you please open a new ticket? This would make it easier for others with similar issues to find the ticket.

-Einar

RE: i2c_write_dt gives me -EIO

J0sh1101 — Thu, 02 Mar 2023 19:58:51 GMT

Hi Einarh, thanks! That was the issue. I can now use the I2C bus. However, I have another problem on a similar matter. I am now using the BME680 Sensor from Bosch. I decided to take the library from zephry and did some configuration to make it compatible to nrf9160. I can compile it, but at run time the function device_is_ready() fails.It fails on this line:

Basically, the dev->state->int_res should be 0, but it is 5, which in the errno.h is I/O error. Why is that so? Below are the files:

main.c

/*
 * Copyright (c) 2018 Bosch Sensortec GmbH
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/sensor.h>
#include <stdio.h>

void main(void)
{
	const struct device *const dev = DEVICE_DT_GET_ONE(bosch_bme680);
	struct sensor_value temp, press, humidity, gas_res;

	if (!device_is_ready(dev)) {
		printk("sensor: device not ready.\n");
		return;
	}

	printf("Device %p name is %s\n", dev, dev->name);

	while (1) {
		k_sleep(K_MSEC(3000));

		sensor_sample_fetch(dev);
		sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
		sensor_channel_get(dev, SENSOR_CHAN_PRESS, &press);
		sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &humidity);
		sensor_channel_get(dev, SENSOR_CHAN_GAS_RES, &gas_res);

		printf("T: %d.%06d; P: %d.%06d; H: %d.%06d; G: %d.%06d\n",
				temp.val1, temp.val2, press.val1, press.val2,
				humidity.val1, humidity.val2, gas_res.val1,
				gas_res.val2);
	}
}

nrf9160dk_nrf9160_ns.overlay:

&i2c2 {
	bme680: bme680@77 {
		compatible = "bosch,bme680";
		reg = <0x77>;
	};
};

zephyr.dts

/dts-v1/;

/ {
	#address-cells = < 0x1 >;
	#size-cells = < 0x1 >;
	model = "Nordic nRF9160 DK NRF9160";
	compatible = "nordic,nrf9160-dk-nrf9160";
	chosen {
		zephyr,entropy = &psa_rng;
		zephyr,flash-controller = &flash_controller;
		zephyr,console = &uart0;
		zephyr,shell-uart = &uart0;
		zephyr,uart-mcumgr = &uart0;
		zephyr,flash = &flash0;
		zephyr,sram = &sram0_ns;
		zephyr,code-partition = &slot0_ns_partition;
	};
	aliases {
		led0 = &led0;
		led1 = &led1;
		led2 = &led2;
		led3 = &led3;
		pwm-led0 = &pwm_led0;
		sw0 = &button0;
		sw1 = &button1;
		sw2 = &button2;
		sw3 = &button3;
		bootloader-led0 = &led0;
		mcuboot-button0 = &button0;
		mcuboot-led0 = &led0;
		watchdog0 = &wdt0;
	};
	soc {
		#address-cells = < 0x1 >;
		#size-cells = < 0x1 >;
		compatible = "nordic,nRF9160-SICA", "nordic,nRF9160", "nordic,nRF91", "simple-bus";
		interrupt-parent = < &nvic >;
		ranges;
		nvic: interrupt-controller@e000e100 {
			#address-cells = < 0x1 >;
			compatible = "arm,v8m-nvic";
			reg = < 0xe000e100 0xc00 >;
			interrupt-controller;
			#interrupt-cells = < 0x2 >;
			arm,num-irq-priority-bits = < 0x3 >;
			phandle = < 0x1 >;
		};
		systick: timer@e000e010 {
			compatible = "arm,armv8m-systick";
			reg = < 0xe000e010 0x10 >;
			status = "disabled";
		};
		sram0: memory@20000000 {
			compatible = "mmio-sram";
			reg = < 0x20000000 0x40000 >;
		};
		peripheral@40000000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x1 >;
			ranges = < 0x0 0x40000000 0x10000000 >;
			flash_controller: flash-controller@39000 {
				compatible = "nordic,nrf91-flash-controller";
				reg = < 0x39000 0x1000 >;
				partial-erase;
				#address-cells = < 0x1 >;
				#size-cells = < 0x1 >;
				flash0: flash@0 {
					compatible = "soc-nv-flash";
					erase-block-size = < 0x1000 >;
					write-block-size = < 0x4 >;
					reg = < 0x0 0x100000 >;
					partitions {
						compatible = "fixed-partitions";
						#address-cells = < 0x1 >;
						#size-cells = < 0x1 >;
						boot_partition: partition@0 {
							label = "mcuboot";
							reg = < 0x0 0x10000 >;
						};
						slot0_partition: partition@10000 {
							label = "image-0";
							reg = < 0x10000 0x40000 >;
						};
						slot0_ns_partition: partition@50000 {
							label = "image-0-nonsecure";
							reg = < 0x50000 0x30000 >;
						};
						slot1_partition: partition@80000 {
							label = "image-1";
							reg = < 0x80000 0x40000 >;
						};
						slot1_ns_partition: partition@c0000 {
							label = "image-1-nonsecure";
							reg = < 0xc0000 0x30000 >;
						};
						scratch_partition: partition@f0000 {
							label = "image-scratch";
							reg = < 0xf0000 0xa000 >;
						};
						storage_partition: partition@fa000 {
							label = "storage";
							reg = < 0xfa000 0x6000 >;
						};
					};
				};
			};
			adc: adc@e000 {
				compatible = "nordic,nrf-saadc";
				reg = < 0xe000 0x1000 >;
				interrupts = < 0xe 0x1 >;
				status = "okay";
				#io-channel-cells = < 0x1 >;
				phandle = < 0x12 >;
			};
			dppic: dppic@17000 {
				compatible = "nordic,nrf-dppic";
				reg = < 0x17000 0x1000 >;
				status = "okay";
			};
			egu0: egu@1b000 {
				compatible = "nordic,nrf-egu";
				reg = < 0x1b000 0x1000 >;
				interrupts = < 0x1b 0x1 >;
				status = "okay";
			};
			egu1: egu@1c000 {
				compatible = "nordic,nrf-egu";
				reg = < 0x1c000 0x1000 >;
				interrupts = < 0x1c 0x1 >;
				status = "okay";
			};
			egu2: egu@1d000 {
				compatible = "nordic,nrf-egu";
				reg = < 0x1d000 0x1000 >;
				interrupts = < 0x1d 0x1 >;
				status = "okay";
			};
			egu3: egu@1e000 {
				compatible = "nordic,nrf-egu";
				reg = < 0x1e000 0x1000 >;
				interrupts = < 0x1e 0x1 >;
				status = "okay";
			};
			egu4: egu@1f000 {
				compatible = "nordic,nrf-egu";
				reg = < 0x1f000 0x1000 >;
				interrupts = < 0x1f 0x1 >;
				status = "okay";
			};
			egu5: egu@20000 {
				compatible = "nordic,nrf-egu";
				reg = < 0x20000 0x1000 >;
				interrupts = < 0x20 0x1 >;
				status = "okay";
			};
			ipc: ipc@2a000 {
				compatible = "nordic,nrf-ipc";
				reg = < 0x2a000 0x1000 >;
				interrupts = < 0x2a 0x1 >;
				status = "okay";
			};
			i2s0: i2s@28000 {
				compatible = "nordic,nrf-i2s";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0x28000 0x1000 >;
				interrupts = < 0x28 0x1 >;
				status = "disabled";
			};
			kmu: kmu@39000 {
				compatible = "nordic,nrf-kmu";
				reg = < 0x39000 0x1000 >;
				interrupts = < 0x39 0x1 >;
				status = "okay";
			};
			pdm0: pdm@26000 {
				compatible = "nordic,nrf-pdm";
				reg = < 0x26000 0x1000 >;
				interrupts = < 0x26 0x1 >;
				status = "disabled";
			};
			regulators: regulator@4000 {
				compatible = "nordic,nrf-regulators";
				reg = < 0x4000 0x1000 >;
				status = "okay";
			};
			vmc: vmc@3a000 {
				compatible = "nordic,nrf-vmc";
				reg = < 0x3a000 0x1000 >;
				status = "okay";
			};
			uart0: uart@8000 {
				compatible = "nordic,nrf-uarte";
				reg = < 0x8000 0x1000 >;
				interrupts = < 0x8 0x1 >;
				status = "okay";
				current-speed = < 0x1c200 >;
				pinctrl-0 = < &uart0_default >;
				pinctrl-1 = < &uart0_sleep >;
				pinctrl-names = "default", "sleep";
			};
			uart1: arduino_serial: uart@9000 {
				compatible = "nordic,nrf-uarte";
				reg = < 0x9000 0x1000 >;
				interrupts = < 0x9 0x1 >;
				status = "disabled";
				current-speed = < 0x1c200 >;
				pinctrl-0 = < &uart1_default >;
				pinctrl-1 = < &uart1_sleep >;
				pinctrl-names = "default", "sleep";
			};
			uart2: uart@a000 {
				compatible = "nordic,nrf-uarte";
				reg = < 0xa000 0x1000 >;
				interrupts = < 0xa 0x1 >;
				status = "disabled";
				pinctrl-0 = < &uart2_default >;
				pinctrl-1 = < &uart2_sleep >;
				pinctrl-names = "default", "sleep";
			};
			uart3: uart@b000 {
				compatible = "nordic,nrf-uarte";
				reg = < 0xb000 0x1000 >;
				interrupts = < 0xb 0x1 >;
				status = "disabled";
			};
			i2c0: i2c@8000 {
				compatible = "nordic,nrf-twim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0x8000 0x1000 >;
				clock-frequency = < 0x186a0 >;
				interrupts = < 0x8 0x1 >;
				status = "disabled";
			};
			i2c1: i2c@9000 {
				compatible = "nordic,nrf-twim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0x9000 0x1000 >;
				clock-frequency = < 0x186a0 >;
				interrupts = < 0x9 0x1 >;
				status = "disabled";
			};
			i2c2: arduino_i2c: i2c@a000 {
				compatible = "nordic,nrf-twim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0xa000 0x1000 >;
				clock-frequency = < 0x186a0 >;
				interrupts = < 0xa 0x1 >;
				status = "okay";
				pinctrl-0 = < &i2c2_default >;
				pinctrl-1 = < &i2c2_sleep >;
				pinctrl-names = "default", "sleep";
				bme680: bme680@77 {
					compatible = "bosch,bme680";
					reg = < 0x77 >;
				};
			};
			i2c3: i2c@b000 {
				compatible = "nordic,nrf-twim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0xb000 0x1000 >;
				clock-frequency = < 0x186a0 >;
				interrupts = < 0xb 0x1 >;
				status = "disabled";
			};
			spi0: spi@8000 {
				compatible = "nordic,nrf-spim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0x8000 0x1000 >;
				interrupts = < 0x8 0x1 >;
				max-frequency = < 0x7a1200 >;
				status = "disabled";
			};
			spi1: spi@9000 {
				compatible = "nordic,nrf-spim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0x9000 0x1000 >;
				interrupts = < 0x9 0x1 >;
				max-frequency = < 0x7a1200 >;
				status = "disabled";
			};
			spi2: spi@a000 {
				compatible = "nordic,nrf-spim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0xa000 0x1000 >;
				interrupts = < 0xa 0x1 >;
				max-frequency = < 0x7a1200 >;
				status = "disabled";
			};
			spi3: arduino_spi: spi@b000 {
				compatible = "nordic,nrf-spim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0xb000 0x1000 >;
				interrupts = < 0xb 0x1 >;
				max-frequency = < 0x7a1200 >;
				status = "okay";
				cs-gpios = < &arduino_header 0x10 0x1 >;
				pinctrl-0 = < &spi3_default >;
				pinctrl-1 = < &spi3_sleep >;
				pinctrl-names = "default", "sleep";
			};
			pwm0: pwm@21000 {
				compatible = "nordic,nrf-pwm";
				reg = < 0x21000 0x1000 >;
				interrupts = < 0x21 0x1 >;
				status = "okay";
				#pwm-cells = < 0x3 >;
				pinctrl-0 = < &pwm0_default >;
				pinctrl-1 = < &pwm0_sleep >;
				pinctrl-names = "default", "sleep";
				phandle = < 0x10 >;
			};
			pwm1: pwm@22000 {
				compatible = "nordic,nrf-pwm";
				reg = < 0x22000 0x1000 >;
				interrupts = < 0x22 0x1 >;
				status = "disabled";
				#pwm-cells = < 0x3 >;
			};
			pwm2: pwm@23000 {
				compatible = "nordic,nrf-pwm";
				reg = < 0x23000 0x1000 >;
				interrupts = < 0x23 0x1 >;
				status = "disabled";
				#pwm-cells = < 0x3 >;
			};
			pwm3: pwm@24000 {
				compatible = "nordic,nrf-pwm";
				reg = < 0x24000 0x1000 >;
				interrupts = < 0x24 0x1 >;
				status = "disabled";
				#pwm-cells = < 0x3 >;
			};
			gpio0: gpio@842500 {
				compatible = "nordic,nrf-gpio";
				gpio-controller;
				reg = < 0x842500 0x300 >;
				#gpio-cells = < 0x2 >;
				status = "okay";
				port = < 0x0 >;
				phandle = < 0xf >;
			};
			rtc0: rtc@14000 {
				compatible = "nordic,nrf-rtc";
				reg = < 0x14000 0x1000 >;
				cc-num = < 0x4 >;
				interrupts = < 0x14 0x1 >;
				status = "okay";
				clock-frequency = < 0x8000 >;
				prescaler = < 0x1 >;
			};
			rtc1: rtc@15000 {
				compatible = "nordic,nrf-rtc";
				reg = < 0x15000 0x1000 >;
				cc-num = < 0x4 >;
				interrupts = < 0x15 0x1 >;
				status = "okay";
				clock-frequency = < 0x8000 >;
				prescaler = < 0x1 >;
			};
			clock: clock@5000 {
				compatible = "nordic,nrf-clock";
				reg = < 0x5000 0x1000 >;
				interrupts = < 0x5 0x1 >;
				status = "okay";
			};
			power: power@5000 {
				compatible = "nordic,nrf-power";
				reg = < 0x5000 0x1000 >;
				interrupts = < 0x5 0x1 >;
				status = "okay";
			};
			wdt: wdt0: watchdog@18000 {
				compatible = "nordic,nrf-wdt";
				reg = < 0x18000 0x1000 >;
				interrupts = < 0x18 0x1 >;
				status = "okay";
			};
			timer0: timer@f000 {
				compatible = "nordic,nrf-timer";
				status = "okay";
				reg = < 0xf000 0x1000 >;
				cc-num = < 0x6 >;
				interrupts = < 0xf 0x1 >;
				prescaler = < 0x0 >;
			};
			timer1: timer@10000 {
				compatible = "nordic,nrf-timer";
				status = "okay";
				reg = < 0x10000 0x1000 >;
				cc-num = < 0x6 >;
				interrupts = < 0x10 0x1 >;
				prescaler = < 0x0 >;
			};
			timer2: timer@11000 {
				compatible = "nordic,nrf-timer";
				status = "okay";
				reg = < 0x11000 0x1000 >;
				cc-num = < 0x6 >;
				interrupts = < 0x11 0x1 >;
				prescaler = < 0x0 >;
			};
		};
		gpiote: gpiote@40031000 {
			compatible = "nordic,nrf-gpiote";
			reg = < 0x40031000 0x1000 >;
			interrupts = < 0x31 0x5 >;
			status = "okay";
		};
	};
	pinctrl: pin-controller {
		compatible = "nordic,nrf-pinctrl";
		uart0_default: uart0_default {
			phandle = < 0x2 >;
			group1 {
				psels = < 0x1d >, < 0x2001b >;
			};
			group2 {
				psels = < 0x1001c >, < 0x3001a >;
				bias-pull-up;
			};
		};
		uart0_sleep: uart0_sleep {
			phandle = < 0x3 >;
			group1 {
				psels = < 0x1d >, < 0x1001c >, < 0x2001b >, < 0x3001a >;
				low-power-enable;
			};
		};
		uart1_default: uart1_default {
			phandle = < 0x4 >;
			group1 {
				psels = < 0x1 >, < 0x2000e >;
			};
			group2 {
				psels = < 0x10000 >, < 0x3000f >;
				bias-pull-up;
			};
		};
		uart1_sleep: uart1_sleep {
			phandle = < 0x5 >;
			group1 {
				psels = < 0x1 >, < 0x10000 >, < 0x2000e >, < 0x3000f >;
				low-power-enable;
			};
		};
		uart2_default: uart2_default {
			phandle = < 0x6 >;
			group1 {
				psels = < 0x18 >, < 0x10017 >;
			};
		};
		uart2_sleep: uart2_sleep {
			phandle = < 0x7 >;
			group1 {
				psels = < 0x18 >, < 0x10017 >;
				low-power-enable;
			};
		};
		i2c2_default: i2c2_default {
			phandle = < 0x8 >;
			group1 {
				psels = < 0xc001e >, < 0xb001f >;
			};
		};
		i2c2_sleep: i2c2_sleep {
			phandle = < 0x9 >;
			group1 {
				psels = < 0xc001e >, < 0xb001f >;
				low-power-enable;
			};
		};
		pwm0_default: pwm0_default {
			phandle = < 0xd >;
			group1 {
				psels = < 0x160002 >;
			};
		};
		pwm0_sleep: pwm0_sleep {
			phandle = < 0xe >;
			group1 {
				psels = < 0x160002 >;
				low-power-enable;
			};
		};
		spi3_default: spi3_default {
			phandle = < 0xb >;
			group1 {
				psels = < 0x4000d >, < 0x6000c >, < 0x5000b >;
			};
		};
		spi3_sleep: spi3_sleep {
			phandle = < 0xc >;
			group1 {
				psels = < 0x4000d >, < 0x6000c >, < 0x5000b >;
				low-power-enable;
			};
		};
	};
	rng_hci: entropy_bt_hci {
		compatible = "zephyr,bt-hci-entropy";
		status = "okay";
	};
	cpus {
		#address-cells = < 0x1 >;
		#size-cells = < 0x0 >;
		cpu@0 {
			device_type = "cpu";
			compatible = "arm,cortex-m33f";
			reg = < 0x0 >;
			#address-cells = < 0x1 >;
			#size-cells = < 0x1 >;
			mpu: mpu@e000ed90 {
				compatible = "arm,armv8m-mpu";
				reg = < 0xe000ed90 0x40 >;
				arm,num-mpu-regions = < 0x10 >;
			};
		};
	};
	psa_rng: psa-rng {
		compatible = "zephyr,psa-crypto-rng";
		status = "okay";
	};
	leds {
		compatible = "gpio-leds";
		led0: led_0 {
			gpios = < &gpio0 0x2 0x0 >;
			label = "Green LED 1";
		};
		led1: led_1 {
			gpios = < &gpio0 0x3 0x0 >;
			label = "Green LED 2";
		};
		led2: led_2 {
			gpios = < &gpio0 0x4 0x0 >;
			label = "Green LED 3";
		};
		led3: led_3 {
			gpios = < &gpio0 0x5 0x0 >;
			label = "Green LED 4";
		};
	};
	pwmleds {
		compatible = "pwm-leds";
		pwm_led0: pwm_led_0 {
			pwms = < &pwm0 0x0 0x1312d00 0x0 >;
		};
	};
	buttons {
		compatible = "gpio-keys";
		button0: button_0 {
			gpios = < &gpio0 0x6 0x11 >;
			label = "Push button 1";
		};
		button1: button_1 {
			gpios = < &gpio0 0x7 0x11 >;
			label = "Push button 2";
		};
		button2: button_2 {
			gpios = < &gpio0 0x8 0x11 >;
			label = "Switch 1";
		};
		button3: button_3 {
			gpios = < &gpio0 0x9 0x11 >;
			label = "Switch 2";
		};
	};
	interface_to_nrf52840: gpio-interface {
		compatible = "nordic,nrf9160dk-nrf52840-interface";
		#gpio-cells = < 0x2 >;
		gpio-map-mask = < 0xf 0x0 >;
		gpio-map-pass-thru = < 0x0 0xffffffff >;
		gpio-map = < 0x0 0x0 &gpio0 0x11 0x0 >, < 0x1 0x0 &gpio0 0x12 0x0 >, < 0x2 0x0 &gpio0 0x13 0x0 >, < 0x3 0x0 &gpio0 0x15 0x0 >, < 0x4 0x0 &gpio0 0x16 0x0 >, < 0x5 0x0 &gpio0 0x17 0x0 >;
		phandle = < 0x11 >;
	};
	nrf52840_reset: gpio-reset {
		compatible = "nordic,nrf9160dk-nrf52840-reset";
		status = "disabled";
		gpios = < &interface_to_nrf52840 0x5 0x0 >;
	};
	arduino_header: connector {
		compatible = "arduino-header-r3";
		#gpio-cells = < 0x2 >;
		gpio-map-mask = < 0xffffffff 0xffffffc0 >;
		gpio-map-pass-thru = < 0x0 0x3f >;
		gpio-map = < 0x0 0x0 &gpio0 0xe 0x0 >, < 0x1 0x0 &gpio0 0xf 0x0 >, < 0x2 0x0 &gpio0 0x10 0x0 >, < 0x3 0x0 &gpio0 0x11 0x0 >, < 0x4 0x0 &gpio0 0x12 0x0 >, < 0x5 0x0 &gpio0 0x13 0x0 >, < 0x6 0x0 &gpio0 0x0 0x0 >, < 0x7 0x0 &gpio0 0x1 0x0 >, < 0x8 0x0 &gpio0 0x2 0x0 >, < 0x9 0x0 &gpio0 0x3 0x0 >, < 0xa 0x0 &gpio0 0x4 0x0 >, < 0xb 0x0 &gpio0 0x5 0x0 >, < 0xc 0x0 &gpio0 0x6 0x0 >, < 0xd 0x0 &gpio0 0x7 0x0 >, < 0xe 0x0 &gpio0 0x8 0x0 >, < 0xf 0x0 &gpio0 0x9 0x0 >, < 0x10 0x0 &gpio0 0xa 0x0 >, < 0x11 0x0 &gpio0 0xb 0x0 >, < 0x12 0x0 &gpio0 0xc 0x0 >, < 0x13 0x0 &gpio0 0xd 0x0 >, < 0x14 0x0 &gpio0 0x1e 0x0 >, < 0x15 0x0 &gpio0 0x1f 0x0 >;
		phandle = < 0xa >;
	};
	arduino_adc: analog-connector {
		compatible = "arduino,uno-adc";
		#io-channel-cells = < 0x1 >;
		io-channel-map = < 0x0 &adc 0x1 >, < 0x1 &adc 0x2 >, < 0x2 &adc 0x3 >, < 0x3 &adc 0x4 >, < 0x4 &adc 0x5 >, < 0x5 &adc 0x6 >;
	};
	reserved-memory {
		#address-cells = < 0x1 >;
		#size-cells = < 0x1 >;
		ranges;
		sram0_s: image_s@20000000 {
			reg = < 0x20000000 0x16000 >;
		};
		sram0_modem: image_modem@20016000 {
			reg = < 0x20016000 0xa000 >;
		};
		sram0_ns: image_ns@20020000 {
			reg = < 0x20020000 0x20000 >;
		};
	};
};

prj.conf

CONFIG_STDOUT_CONSOLE=y
CONFIG_I2C=y
CONFIG_SENSOR=y

# BME680 - Temperature and humidity sensor.
CONFIG_DT_HAS_BOSCH_BME680_ENABLED=y
CONFIG_BME680=y
CONFIG_BME680_TEMP_OVER_2X=y
CONFIG_BME680_PRESS_OVER_16X=y
CONFIG_BME680_HUMIDITY_OVER_1X=y

RE: i2c_write_dt gives me -EIO

J0sh1101 — Wed, 15 Feb 2023 21:09:18 GMT

Okay, now I understand. The pins should normally be configured as open-drain. They can only pull to ground. I don't know where and how this is done in Zephyr.

I will get an I2C sensor with pull-ups to test if this is the case.

RE: i2c_write_dt gives me -EIO

Einarh — Tue, 14 Feb 2023 14:15:43 GMT

Ok I see.

Then I have a couple pointers:

Your SDA and CLK pins must be pulled up if they aren't already, it's likely that what you're seeing is caused by SDA being grounded.
TWIM specification says that "If a NACK is clocked in from the slave, the TWI master will generate an ERROR event." Though it says "from the slave" so this might be irrelevant.

More info here: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf9160%2Ftwim.html&cp=2_0_0_5_16

-Einar

RE: i2c_write_dt gives me -EIO

J0sh1101 — Tue, 14 Feb 2023 11:21:19 GMT

I don't have a sensor connected to the DK at the moment. I just wanted to try to see if I can send the address out.... I should at least get an address and NACK from I2C.

RE: i2c_write_dt gives me -EIO

Einarh — Tue, 14 Feb 2023 10:43:01 GMT

I see in your picture that you have the DK, but I don't see an expansion board/shield.

What sensor are you communicating with?

-Einar

RE: i2c_write_dt gives me -EIO

J0sh1101 — Mon, 13 Feb 2023 18:55:50 GMT

Hi,

I looked in the v2.2.99-dev3\zephyr\boards\arm\nrf9160dk_nrf9160\nrf9160dk_nrf9160_common-pinctrl.dtsi file, and there I found that the i2c2 was used. So I thought it was safe to use.

I added the zephyr.dts above in the first post and also added the picture of the board to show that I have the right board. I wrote a simple program to trigger an interrupt on the buttons to switch some leds. It worked.

I have seen in some posts that maybe there is a pull-up configured on the pins, which is causing the error and the strange pulses seen with the logic analyser. With STM you have the configuration in the C file, but I am on thin ice here as I have so much experience with Zephyr and Nordic.

RE: i2c_write_dt gives me -EIO

Einarh — Mon, 13 Feb 2023 10:02:39 GMT

Hello

I assume you actually have an expansion board connected to your DK?

Also, have you taken this into account, since you're using the nRF9160 and not the nRF52833:

Depending on your board, the I2C controller connected to the UNO R3 Connector can be i2c0 , i2c1 i2c2 or i2c3. Check the schematic of your board to know which I2C controller the UNO R3 Connector is connected to, like we did at the beginning of this exercise.

Could you share your generated devicetree in /build/zephyr/zephyr.dts?

Best regards,

Einar