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  • Case ID: 291287
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Using both TWIM instances not work on certain pins

pwpot

Hi,

I noticed weird behaviour while using TWIM0 and TWIM1.

My setup is : 

  • nrf52dk 
  • NRF Connect SDK v1.8.0
  • SPI2 works with SDMMC driver to handle the sd card
  • TWIM1 handle the OLED SSD1306
  • TWIM0 handle the VL6180x

I am working directly on nrfx drivers.

I 've got TWIM1 instance configured on pins P0.27(SCL), P0.28(SDA). That instance works correctly, both lines are pulled high by internal pull-up resistors, and the whole communication with my external OLED works great. 

In my setup I have to use the TWIM0 instance also. That instance is configured on pins P0.31(SCL), P0.30(SDA) but in that case both lines are hold low at level of 20mV. 

I decided to simply change the TWIM0 pins to P0.03(SCL), P0.04(SDA). In that configuration lines are pulled high and the I2C communication works correctly.

I double checked the nrf52dk layout to check if P0.31 and P0.30 are used in another way by the board, but it seems that they are directly connected from the header to nrf52832 pads. 

I am aware of shared resources of peripheral instances but in that configuration it doesn't occur.

What am I missing ? 

What could cause that behaviour ? 

Thanks you in advance,

  • 0

    Hi pwpot,

    As Vasily points out it is recommended to use an overlay. In some cases it will not make any difference, however, it is easier to compare projects and debug if things are done the standard way. Section 1.4 in the Getting started with nRF Connect SDK tutorial, covers the use of overlays.

    Could you please post the file build/zephyr/zephyr.dts?

    Best regards,

    Håkon

  • 0 in reply to helsing

    Hi Håkon,

    What about having the custom pcb board with nrf52832 ? In that situation should I also use the dts file nrf52dk_nrf52832.dts ? and then make changes in overlay file ? 

    That is my zephyr.dts file : 

    /dts-v1/;

/ {
	#address-cells = < 0x1 >;
	#size-cells = < 0x1 >;
	model = "Nordic nRF52 DK NRF52832";
	compatible = "nordic,nrf52-dk-nrf52832";
	chosen {
		zephyr,entropy = &rng;
		zephyr,flash-controller = &flash_controller;
		zephyr,console = &uart0;
		zephyr,shell-uart = &uart0;
		zephyr,uart-mcumgr = &uart0;
		zephyr,bt-mon-uart = &uart0;
		zephyr,bt-c2h-uart = &uart0;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
		zephyr,code-partition = &slot0_partition;
	};
	aliases {
	};
	soc {
		#address-cells = < 0x1 >;
		#size-cells = < 0x1 >;
		compatible = "nordic,nRF52832-QFAA", "nordic,nRF52832", "nordic,nRF52", "simple-bus";
		interrupt-parent = < &nvic >;
		ranges;
		nvic: interrupt-controller@e000e100 {
			#address-cells = < 0x1 >;
			compatible = "arm,v7m-nvic";
			reg = < 0xe000e100 0xc00 >;
			interrupt-controller;
			#interrupt-cells = < 0x2 >;
			arm,num-irq-priority-bits = < 0x3 >;
			phandle = < 0x1 >;
		};
		systick: timer@e000e010 {
			compatible = "arm,armv7m-systick";
			reg = < 0xe000e010 0x10 >;
			status = "disabled";
		};
		ficr: ficr@10000000 {
			compatible = "nordic,nrf-ficr";
			reg = < 0x10000000 0x1000 >;
			status = "okay";
		};
		uicr: uicr@10001000 {
			compatible = "nordic,nrf-uicr";
			reg = < 0x10001000 0x1000 >;
			status = "okay";
		};
		sram0: memory@20000000 {
			compatible = "mmio-sram";
			reg = < 0x20000000 0x10000 >;
		};
		clock: clock@40000000 {
			compatible = "nordic,nrf-clock";
			reg = < 0x40000000 0x1000 >;
			interrupts = < 0x0 0x1 >;
			status = "okay";
			label = "CLOCK";
		};
		radio: radio@40001000 {
			compatible = "nordic,nrf-radio";
			reg = < 0x40001000 0x1000 >;
			interrupts = < 0x1 0x1 >;
			status = "okay";
		};
		uart0: uart@40002000 {
			reg = < 0x40002000 0x1000 >;
			interrupts = < 0x2 0x1 >;
			status = "okay";
			label = "UART_0";
			compatible = "nordic,nrf-uarte";
			current-speed = < 0x1c200 >;
			tx-pin = < 0x6 >;
			rx-pin = < 0x8 >;
			rts-pin = < 0x5 >;
			cts-pin = < 0x7 >;
		};
		i2c0: i2c@40003000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40003000 0x1000 >;
			clock-frequency = < 0x186a0 >;
			interrupts = < 0x3 0x1 >;
			status = "disabled";
			label = "I2C_0";
		};
		spi0: spi@40003000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40003000 0x1000 >;
			interrupts = < 0x3 0x1 >;
			status = "disabled";
			label = "SPI_0";
		};
		i2c1: i2c@40004000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40004000 0x1000 >;
			clock-frequency = < 0x186a0 >;
			interrupts = < 0x4 0x1 >;
			status = "disabled";
			label = "I2C_1";
		};
		spi1: spi@40004000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40004000 0x1000 >;
			interrupts = < 0x4 0x1 >;
			status = "disabled";
			label = "SPI_1";
		};
		gpiote: gpiote@40006000 {
			compatible = "nordic,nrf-gpiote";
			reg = < 0x40006000 0x1000 >;
			interrupts = < 0x6 0x5 >;
			status = "okay";
			label = "GPIOTE_0";
		};
		adc: adc@40007000 {
			compatible = "nordic,nrf-saadc";
			reg = < 0x40007000 0x1000 >;
			interrupts = < 0x7 0x1 >;
			status = "okay";
			label = "ADC_0";
			#io-channel-cells = < 0x1 >;
		};
		timer0: timer@40008000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x40008000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0x8 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_0";
		};
		timer1: timer@40009000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x40009000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0x9 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_1";
		};
		timer2: timer@4000a000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x4000a000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0xa 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_2";
			phandle = < 0x3 >;
		};
		rtc0: rtc@4000b000 {
			compatible = "nordic,nrf-rtc";
			reg = < 0x4000b000 0x1000 >;
			cc-num = < 0x3 >;
			interrupts = < 0xb 0x1 >;
			status = "okay";
			clock-frequency = < 0x8000 >;
			prescaler = < 0x1 >;
			label = "RTC_0";
		};
		temp: temp@4000c000 {
			compatible = "nordic,nrf-temp";
			reg = < 0x4000c000 0x1000 >;
			interrupts = < 0xc 0x1 >;
			status = "okay";
			label = "TEMP_0";
		};
		rng: random@4000d000 {
			compatible = "nordic,nrf-rng";
			reg = < 0x4000d000 0x1000 >;
			interrupts = < 0xd 0x1 >;
			status = "okay";
			label = "RNG";
		};
		ecb: ecb@4000e000 {
			compatible = "nordic,nrf-ecb";
			reg = < 0x4000e000 0x1000 >;
			interrupts = < 0xe 0x1 >;
			status = "okay";
			label = "ECB";
		};
		wdt: wdt0: watchdog@40010000 {
			compatible = "nordic,nrf-watchdog";
			reg = < 0x40010000 0x1000 >;
			interrupts = < 0x10 0x1 >;
			status = "okay";
			label = "WDT";
		};
		rtc1: rtc@40011000 {
			compatible = "nordic,nrf-rtc";
			reg = < 0x40011000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0x11 0x1 >;
			status = "okay";
			clock-frequency = < 0x8000 >;
			prescaler = < 0x1 >;
			label = "RTC_1";
		};
		qdec: qdec@40012000 {
			compatible = "nordic,nrf-qdec";
			reg = < 0x40012000 0x1000 >;
			interrupts = < 0x12 0x1 >;
			status = "disabled";
			label = "QDEC";
		};
		egu0: egu@40014000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40014000 0x1000 >;
			interrupts = < 0x14 0x1 >;
			status = "okay";
		};
		egu1: egu@40015000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40015000 0x1000 >;
			interrupts = < 0x15 0x1 >;
			status = "okay";
		};
		egu2: egu@40016000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40016000 0x1000 >;
			interrupts = < 0x16 0x1 >;
			status = "okay";
		};
		egu3: egu@40017000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40017000 0x1000 >;
			interrupts = < 0x17 0x1 >;
			status = "okay";
		};
		egu4: egu@40018000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40018000 0x1000 >;
			interrupts = < 0x18 0x1 >;
			status = "okay";
		};
		egu5: egu@40019000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40019000 0x1000 >;
			interrupts = < 0x19 0x1 >;
			status = "okay";
		};
		timer3: timer@4001a000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x4001a000 0x1000 >;
			cc-num = < 0x6 >;
			interrupts = < 0x1a 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_3";
		};
		timer4: timer@4001b000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x4001b000 0x1000 >;
			cc-num = < 0x6 >;
			interrupts = < 0x1b 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_4";
		};
		pwm0: pwm@4001c000 {
			compatible = "nordic,nrf-pwm";
			reg = < 0x4001c000 0x1000 >;
			interrupts = < 0x1c 0x1 >;
			status = "disabled";
			label = "PWM_0";
			#pwm-cells = < 0x1 >;
		};
		pdm0: pdm@4001d000 {
			compatible = "nordic,nrf-pdm";
			reg = < 0x4001d000 0x1000 >;
			interrupts = < 0x1d 0x1 >;
			status = "disabled";
			label = "PDM_0";
		};
		flash_controller: flash-controller@4001e000 {
			compatible = "nordic,nrf52-flash-controller";
			reg = < 0x4001e000 0x1000 >;
			#address-cells = < 0x1 >;
			#size-cells = < 0x1 >;
			label = "NRF_FLASH_DRV_NAME";
			flash0: flash@0 {
				compatible = "soc-nv-flash";
				label = "NRF_FLASH";
				erase-block-size = < 0x1000 >;
				write-block-size = < 0x4 >;
				reg = < 0x0 0x80000 >;
				partitions {
					compatible = "fixed-partitions";
					#address-cells = < 0x1 >;
					#size-cells = < 0x1 >;
					boot_partition: partition@0 {
						label = "mcuboot";
						reg = < 0x0 0xc000 >;
					};
					slot0_partition: partition@c000 {
						label = "image-0";
						reg = < 0xc000 0x32000 >;
					};
					slot1_partition: partition@3e000 {
						label = "image-1";
						reg = < 0x3e000 0x32000 >;
					};
					scratch_partition: partition@70000 {
						label = "image-scratch";
						reg = < 0x70000 0xa000 >;
					};
					storage_partition: partition@7a000 {
						label = "storage";
						reg = < 0x7a000 0x6000 >;
					};
				};
			};
		};
		pwm1: pwm@40021000 {
			compatible = "nordic,nrf-pwm";
			reg = < 0x40021000 0x1000 >;
			interrupts = < 0x21 0x1 >;
			status = "disabled";
			label = "PWM_1";
			#pwm-cells = < 0x1 >;
		};
		pwm2: pwm@40022000 {
			compatible = "nordic,nrf-pwm";
			reg = < 0x40022000 0x1000 >;
			interrupts = < 0x22 0x1 >;
			status = "disabled";
			label = "PWM_2";
			#pwm-cells = < 0x1 >;
		};
		spi2: spi@40023000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40023000 0x1000 >;
			interrupts = < 0x23 0x1 >;
			status = "okay";
			label = "SPI_2";
			compatible = "nordic,nrf-spi";
			sck-pin = < 0x19 >;
			mosi-pin = < 0x17 >;
			miso-pin = < 0x18 >;
			cs-gpios = < &gpio0 0x16 0x1 >;
			sdhc0: sdhc@0 {
				compatible = "zephyr,mmc-spi-slot";
				reg = < 0x0 >;
				status = "okay";
				label = "SDHC0";
				spi-max-frequency = < 0x16e3600 >;
			};
		};
		rtc2: rtc@40024000 {
			compatible = "nordic,nrf-rtc";
			reg = < 0x40024000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0x24 0x1 >;
			status = "okay";
			clock-frequency = < 0x8000 >;
			prescaler = < 0x1 >;
			label = "RTC_2";
		};
		i2s0: i2s@40025000 {
			compatible = "nordic,nrf-i2s";
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40025000 0x1000 >;
			interrupts = < 0x25 0x1 >;
			status = "disabled";
			label = "I2S_0";
		};
		gpio0: gpio@50000000 {
			compatible = "nordic,nrf-gpio";
			gpio-controller;
			reg = < 0x50000000 0x1000 >;
			#gpio-cells = < 0x2 >;
			label = "GPIO_0";
			status = "okay";
			port = < 0x0 >;
			phandle = < 0x2 >;
		};
	};
	cpus {
		#address-cells = < 0x1 >;
		#size-cells = < 0x0 >;
		cpu@0 {
			device_type = "cpu";
			compatible = "arm,cortex-m4f";
			reg = < 0x0 >;
			swo-ref-frequency = < 0x1e84800 >;
		};
	};
	sw_pwm: sw-pwm {
		compatible = "nordic,nrf-sw-pwm";
		status = "disabled";
		label = "SW_PWM";
		generator = < &timer2 >;
		channel-count = < 0x3 >;
		clock-prescaler = < 0x0 >;
		ppi-base = < 0x0 >;
		gpiote-base = < 0x0 >;
		#pwm-cells = < 0x1 >;
	};
};

  • 0

    Hi,

    I want to summarize some things, beacuse we are loosing the point Slight smile

    I made some changes. Right now I am working on nrf52dk with nrf52832. Due to your recommendations I have restored all of my board settings to default. I copied the nrf52dk_nrf52832 board definition from zephyr/boards directory to my application boards directory. I created the nrf52dk_nrf52832.overlay file which looks as follows : 

    &spi2 {
	cs-gpios = <&gpio0 22 GPIO_ACTIVE_LOW>; /* D10 */
	sck-pin = <25>;
	mosi-pin = <23>;
	miso-pin = <24>;
	sdhc0: sdhc@0 {
            compatible = "zephyr,mmc-spi-slot";
			reg = <0>;
			status = "okay";
			label = "SDHC0";
			spi-max-frequency = <24000000>;
	};
};

&gpio0 {
	status = "okay";
};


&spi1{
	status = "disabled";
	compatible = "nordic,nrf-spim";
};

&spi0{
	status = "disabled";
	compatible = "nordic,nrf-spim";
};

&i2c0{
	compatible = "nordic,nrf-twim";
	status = "disabled";
	sda-pin = <31>;
	scl-pin = <30>;
};

&i2c1{
	compatible = "nordic,nrf-twim";
	status = "disabled";
	sda-pin = <26>;
	scl-pin = <27>;
};

&adc {
	status = "disabled";
};

&gpiote {
	status = "disabled";
};

    Due to the shared resources of some Instantiation (ref: nrf52832_PS.1.v8) I disabled the SPI0, SPI1. I also disabled the I2C instances to let know the Zephyr driver to do not use that space beacuse it is going to be used by twim nrfx drivers. 

    The prj.conf : 

    # GPIO
CONFIG_NRFX_GPIOTE=y
# ADC
CONFIG_NRFX_SAADC=y
# SPI-SD-MMC 
CONFIG_DISK_ACCESS=y
CONFIG_DISK_DRIVERS=y
CONFIG_DISK_DRIVER_SDMMC=y
CONFIG_FILE_SYSTEM=y
CONFIG_FAT_FILESYSTEM_ELM=y
# Increase stack size to handle the FAT FS
CONFIG_MAIN_STACK_SIZE=2048
# TWI
CONFIG_NRFX_TWIM=y
CONFIG_NRFX_TWIM0=y
CONFIG_NRFX_TWIM1=y
# LOGGING
CONFIG_PRINTK=y
# ENABLE ZEPHYR SYSTEM LOGGER
CONFIG_LOG=y
CONFIG_LOG_BACKEND_RTT=y

    zephyr.dts : 

    /dts-v1/;

/ {
	#address-cells = < 0x1 >;
	#size-cells = < 0x1 >;
	model = "Nordic nRF52 DK NRF52832";
	compatible = "nordic,nrf52-dk-nrf52832";
	chosen {
		zephyr,entropy = &rng;
		zephyr,flash-controller = &flash_controller;
		zephyr,console = &uart0;
		zephyr,shell-uart = &uart0;
		zephyr,uart-mcumgr = &uart0;
		zephyr,bt-mon-uart = &uart0;
		zephyr,bt-c2h-uart = &uart0;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
		zephyr,code-partition = &slot0_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;
	};
	soc {
		#address-cells = < 0x1 >;
		#size-cells = < 0x1 >;
		compatible = "nordic,nRF52832-QFAA", "nordic,nRF52832", "nordic,nRF52", "simple-bus";
		interrupt-parent = < &nvic >;
		ranges;
		nvic: interrupt-controller@e000e100 {
			#address-cells = < 0x1 >;
			compatible = "arm,v7m-nvic";
			reg = < 0xe000e100 0xc00 >;
			interrupt-controller;
			#interrupt-cells = < 0x2 >;
			arm,num-irq-priority-bits = < 0x3 >;
			phandle = < 0x1 >;
		};
		systick: timer@e000e010 {
			compatible = "arm,armv7m-systick";
			reg = < 0xe000e010 0x10 >;
			status = "disabled";
		};
		ficr: ficr@10000000 {
			compatible = "nordic,nrf-ficr";
			reg = < 0x10000000 0x1000 >;
			status = "okay";
		};
		uicr: uicr@10001000 {
			compatible = "nordic,nrf-uicr";
			reg = < 0x10001000 0x1000 >;
			status = "okay";
		};
		sram0: memory@20000000 {
			compatible = "mmio-sram";
			reg = < 0x20000000 0x10000 >;
		};
		clock: clock@40000000 {
			compatible = "nordic,nrf-clock";
			reg = < 0x40000000 0x1000 >;
			interrupts = < 0x0 0x1 >;
			status = "okay";
			label = "CLOCK";
		};
		radio: radio@40001000 {
			compatible = "nordic,nrf-radio";
			reg = < 0x40001000 0x1000 >;
			interrupts = < 0x1 0x1 >;
			status = "okay";
		};
		uart0: arduino_serial: uart@40002000 {
			reg = < 0x40002000 0x1000 >;
			interrupts = < 0x2 0x1 >;
			status = "okay";
			label = "UART_0";
			compatible = "nordic,nrf-uarte";
			current-speed = < 0x1c200 >;
			tx-pin = < 0x6 >;
			rx-pin = < 0x8 >;
			rts-pin = < 0x5 >;
			cts-pin = < 0x7 >;
		};
		i2c0: arduino_i2c: i2c@40003000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40003000 0x1000 >;
			clock-frequency = < 0x186a0 >;
			interrupts = < 0x3 0x1 >;
			status = "disabled";
			label = "I2C_0";
			compatible = "nordic,nrf-twim";
			sda-pin = < 0x1f >;
			scl-pin = < 0x1e >;
		};
		spi0: spi@40003000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40003000 0x1000 >;
			interrupts = < 0x3 0x1 >;
			status = "disabled";
			label = "SPI_0";
			compatible = "nordic,nrf-spim";
			sck-pin = < 0x1b >;
			mosi-pin = < 0x1a >;
			miso-pin = < 0x1c >;
		};
		i2c1: i2c@40004000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40004000 0x1000 >;
			clock-frequency = < 0x186a0 >;
			interrupts = < 0x4 0x1 >;
			status = "disabled";
			label = "I2C_1";
			compatible = "nordic,nrf-twim";
			sda-pin = < 0x1a >;
			scl-pin = < 0x1b >;
		};
		spi1: spi@40004000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40004000 0x1000 >;
			interrupts = < 0x4 0x1 >;
			status = "disabled";
			label = "SPI_1";
			compatible = "nordic,nrf-spim";
			sck-pin = < 0x1f >;
			mosi-pin = < 0x1e >;
			miso-pin = < 0x1d >;
		};
		gpiote: gpiote@40006000 {
			compatible = "nordic,nrf-gpiote";
			reg = < 0x40006000 0x1000 >;
			interrupts = < 0x6 0x5 >;
			status = "disabled";
			label = "GPIOTE_0";
		};
		adc: adc@40007000 {
			compatible = "nordic,nrf-saadc";
			reg = < 0x40007000 0x1000 >;
			interrupts = < 0x7 0x1 >;
			status = "disabled";
			label = "ADC_0";
			#io-channel-cells = < 0x1 >;
			phandle = < 0x5 >;
		};
		timer0: timer@40008000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x40008000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0x8 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_0";
		};
		timer1: timer@40009000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x40009000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0x9 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_1";
		};
		timer2: timer@4000a000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x4000a000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0xa 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_2";
			phandle = < 0x3 >;
		};
		rtc0: rtc@4000b000 {
			compatible = "nordic,nrf-rtc";
			reg = < 0x4000b000 0x1000 >;
			cc-num = < 0x3 >;
			interrupts = < 0xb 0x1 >;
			status = "okay";
			clock-frequency = < 0x8000 >;
			prescaler = < 0x1 >;
			label = "RTC_0";
		};
		temp: temp@4000c000 {
			compatible = "nordic,nrf-temp";
			reg = < 0x4000c000 0x1000 >;
			interrupts = < 0xc 0x1 >;
			status = "okay";
			label = "TEMP_0";
		};
		rng: random@4000d000 {
			compatible = "nordic,nrf-rng";
			reg = < 0x4000d000 0x1000 >;
			interrupts = < 0xd 0x1 >;
			status = "okay";
			label = "RNG";
		};
		ecb: ecb@4000e000 {
			compatible = "nordic,nrf-ecb";
			reg = < 0x4000e000 0x1000 >;
			interrupts = < 0xe 0x1 >;
			status = "okay";
			label = "ECB";
		};
		wdt: wdt0: watchdog@40010000 {
			compatible = "nordic,nrf-watchdog";
			reg = < 0x40010000 0x1000 >;
			interrupts = < 0x10 0x1 >;
			status = "okay";
			label = "WDT";
		};
		rtc1: rtc@40011000 {
			compatible = "nordic,nrf-rtc";
			reg = < 0x40011000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0x11 0x1 >;
			status = "okay";
			clock-frequency = < 0x8000 >;
			prescaler = < 0x1 >;
			label = "RTC_1";
		};
		qdec: qdec@40012000 {
			compatible = "nordic,nrf-qdec";
			reg = < 0x40012000 0x1000 >;
			interrupts = < 0x12 0x1 >;
			status = "disabled";
			label = "QDEC";
		};
		egu0: egu@40014000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40014000 0x1000 >;
			interrupts = < 0x14 0x1 >;
			status = "okay";
		};
		egu1: egu@40015000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40015000 0x1000 >;
			interrupts = < 0x15 0x1 >;
			status = "okay";
		};
		egu2: egu@40016000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40016000 0x1000 >;
			interrupts = < 0x16 0x1 >;
			status = "okay";
		};
		egu3: egu@40017000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40017000 0x1000 >;
			interrupts = < 0x17 0x1 >;
			status = "okay";
		};
		egu4: egu@40018000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40018000 0x1000 >;
			interrupts = < 0x18 0x1 >;
			status = "okay";
		};
		egu5: egu@40019000 {
			compatible = "nordic,nrf-egu";
			reg = < 0x40019000 0x1000 >;
			interrupts = < 0x19 0x1 >;
			status = "okay";
		};
		timer3: timer@4001a000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x4001a000 0x1000 >;
			cc-num = < 0x6 >;
			interrupts = < 0x1a 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_3";
		};
		timer4: timer@4001b000 {
			compatible = "nordic,nrf-timer";
			status = "okay";
			reg = < 0x4001b000 0x1000 >;
			cc-num = < 0x6 >;
			interrupts = < 0x1b 0x1 >;
			prescaler = < 0x0 >;
			label = "TIMER_4";
		};
		pwm0: pwm@4001c000 {
			compatible = "nordic,nrf-pwm";
			reg = < 0x4001c000 0x1000 >;
			interrupts = < 0x1c 0x1 >;
			status = "okay";
			label = "PWM_0";
			#pwm-cells = < 0x1 >;
			ch0-pin = < 0x11 >;
			ch0-inverted;
			phandle = < 0x4 >;
		};
		pdm0: pdm@4001d000 {
			compatible = "nordic,nrf-pdm";
			reg = < 0x4001d000 0x1000 >;
			interrupts = < 0x1d 0x1 >;
			status = "disabled";
			label = "PDM_0";
		};
		flash_controller: flash-controller@4001e000 {
			compatible = "nordic,nrf52-flash-controller";
			reg = < 0x4001e000 0x1000 >;
			#address-cells = < 0x1 >;
			#size-cells = < 0x1 >;
			label = "NRF_FLASH_DRV_NAME";
			flash0: flash@0 {
				compatible = "soc-nv-flash";
				label = "NRF_FLASH";
				erase-block-size = < 0x1000 >;
				write-block-size = < 0x4 >;
				reg = < 0x0 0x80000 >;
				partitions {
					compatible = "fixed-partitions";
					#address-cells = < 0x1 >;
					#size-cells = < 0x1 >;
					boot_partition: partition@0 {
						label = "mcuboot";
						reg = < 0x0 0xc000 >;
					};
					slot0_partition: partition@c000 {
						label = "image-0";
						reg = < 0xc000 0x32000 >;
					};
					slot1_partition: partition@3e000 {
						label = "image-1";
						reg = < 0x3e000 0x32000 >;
					};
					scratch_partition: partition@70000 {
						label = "image-scratch";
						reg = < 0x70000 0xa000 >;
					};
					storage_partition: partition@7a000 {
						label = "storage";
						reg = < 0x7a000 0x6000 >;
					};
				};
			};
		};
		pwm1: pwm@40021000 {
			compatible = "nordic,nrf-pwm";
			reg = < 0x40021000 0x1000 >;
			interrupts = < 0x21 0x1 >;
			status = "disabled";
			label = "PWM_1";
			#pwm-cells = < 0x1 >;
		};
		pwm2: pwm@40022000 {
			compatible = "nordic,nrf-pwm";
			reg = < 0x40022000 0x1000 >;
			interrupts = < 0x22 0x1 >;
			status = "disabled";
			label = "PWM_2";
			#pwm-cells = < 0x1 >;
		};
		spi2: arduino_spi: spi@40023000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40023000 0x1000 >;
			interrupts = < 0x23 0x1 >;
			status = "okay";
			label = "SPI_2";
			compatible = "nordic,nrf-spi";
			sck-pin = < 0x19 >;
			mosi-pin = < 0x17 >;
			miso-pin = < 0x18 >;
			cs-gpios = < &gpio0 0x16 0x1 >;
			sdhc0: sdhc@0 {
				compatible = "zephyr,mmc-spi-slot";
				reg = < 0x0 >;
				status = "okay";
				label = "SDHC0";
				spi-max-frequency = < 0x16e3600 >;
			};
		};
		rtc2: rtc@40024000 {
			compatible = "nordic,nrf-rtc";
			reg = < 0x40024000 0x1000 >;
			cc-num = < 0x4 >;
			interrupts = < 0x24 0x1 >;
			status = "okay";
			clock-frequency = < 0x8000 >;
			prescaler = < 0x1 >;
			label = "RTC_2";
		};
		i2s0: i2s@40025000 {
			compatible = "nordic,nrf-i2s";
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40025000 0x1000 >;
			interrupts = < 0x25 0x1 >;
			status = "disabled";
			label = "I2S_0";
		};
		gpio0: gpio@50000000 {
			compatible = "nordic,nrf-gpio";
			gpio-controller;
			reg = < 0x50000000 0x1000 >;
			#gpio-cells = < 0x2 >;
			label = "GPIO_0";
			status = "okay";
			port = < 0x0 >;
			phandle = < 0x2 >;
		};
	};
	cpus {
		#address-cells = < 0x1 >;
		#size-cells = < 0x0 >;
		cpu@0 {
			device_type = "cpu";
			compatible = "arm,cortex-m4f";
			reg = < 0x0 >;
			swo-ref-frequency = < 0x1e84800 >;
		};
	};
	sw_pwm: sw-pwm {
		compatible = "nordic,nrf-sw-pwm";
		status = "disabled";
		label = "SW_PWM";
		generator = < &timer2 >;
		channel-count = < 0x3 >;
		clock-prescaler = < 0x0 >;
		ppi-base = < 0x0 >;
		gpiote-base = < 0x0 >;
		#pwm-cells = < 0x1 >;
	};
	leds {
		compatible = "gpio-leds";
		led0: led_0 {
			gpios = < &gpio0 0x11 0x1 >;
			label = "Green LED 0";
		};
		led1: led_1 {
			gpios = < &gpio0 0x12 0x1 >;
			label = "Green LED 1";
		};
		led2: led_2 {
			gpios = < &gpio0 0x13 0x1 >;
			label = "Green LED 2";
		};
		led3: led_3 {
			gpios = < &gpio0 0x14 0x1 >;
			label = "Green LED 3";
		};
	};
	pwmleds {
		compatible = "pwm-leds";
		pwm_led0: pwm_led_0 {
			pwms = < &pwm0 0x11 >;
		};
	};
	buttons {
		compatible = "gpio-keys";
		button0: button_0 {
			gpios = < &gpio0 0xd 0x11 >;
			label = "Push button switch 0";
		};
		button1: button_1 {
			gpios = < &gpio0 0xe 0x11 >;
			label = "Push button switch 1";
		};
		button2: button_2 {
			gpios = < &gpio0 0xf 0x11 >;
			label = "Push button switch 2";
		};
		button3: button_3 {
			gpios = < &gpio0 0x10 0x11 >;
			label = "Push button switch 3";
		};
	};
	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 0x3 0x0 >, < 0x1 0x0 &gpio0 0x4 0x0 >, < 0x2 0x0 &gpio0 0x1c 0x0 >, < 0x3 0x0 &gpio0 0x1d 0x0 >, < 0x4 0x0 &gpio0 0x1e 0x0 >, < 0x5 0x0 &gpio0 0x1f 0x0 >, < 0x6 0x0 &gpio0 0xb 0x0 >, < 0x7 0x0 &gpio0 0xc 0x0 >, < 0x8 0x0 &gpio0 0xd 0x0 >, < 0x9 0x0 &gpio0 0xe 0x0 >, < 0xa 0x0 &gpio0 0xf 0x0 >, < 0xb 0x0 &gpio0 0x10 0x0 >, < 0xc 0x0 &gpio0 0x11 0x0 >, < 0xd 0x0 &gpio0 0x12 0x0 >, < 0xe 0x0 &gpio0 0x13 0x0 >, < 0xf 0x0 &gpio0 0x14 0x0 >, < 0x10 0x0 &gpio0 0x16 0x0 >, < 0x11 0x0 &gpio0 0x17 0x0 >, < 0x12 0x0 &gpio0 0x18 0x0 >, < 0x13 0x0 &gpio0 0x19 0x0 >, < 0x14 0x0 &gpio0 0x1a 0x0 >, < 0x15 0x0 &gpio0 0x1b 0x0 >;
	};
	arduino_adc: analog-connector {
		compatible = "arduino,uno-adc";
		#io-channel-cells = < 0x1 >;
		io-channel-map = < 0x0 &adc 0x1 >, < 0x1 &adc 0x2 >, < 0x2 &adc 0x4 >, < 0x3 &adc 0x5 >, < 0x4 &adc 0x6 >, < 0x5 &adc 0x7 >;
	};
};

    Behaviour of my board is still the same : 

    1. TWIM0 

    • SCL(P0.30) ~ 2.9V (correctly pulled high by internal resistor)
    • SDA(P0.31) ~ 0.05V (floating ?, a lot of noise seen on osciloscope)

    2. TWIM0

    • SCL(P0.31) ~ 0.03V  (a lot of noise seen on osciloscope)
    • SDA(P0.30) ~ 0.05V  (a lot of noise seen on osciloscope)

    3.TWIM0

    In that configuration everything it's up and running.

    • SCL(P0.03) ~ 2.9V (correctly pulled high by internal resistor)
    • SDA(P0.04) ~ 2.9V (correctly pulled high by internal resistor)

    Additionally that is my init function of twim instance. 

    #include "nrfx_twim.h"
#include "sdk_hal_config.h"

#define TWIM_INSTANCE 0
#define I2C0_DEV_NODE DT_NODELABEL(i2c0)
static const nrfx_twim_t twim_inst = NRFX_TWIM_INSTANCE(TWIM_INSTANCE);

void hal_twi_sensor_init(void) {
  nrfx_err_t err;
  nrfx_twim_config_t twim_config = {
      .scl = HAL_I2C0_SCL,
      .sda = HAL_I2C0_SDA,
      .frequency = NRF_TWIM_FREQ_400K,
      .interrupt_priority = NRFX_TWIM_DEFAULT_CONFIG_IRQ_PRIORITY,
      .hold_bus_uninit = false,
  };

  err = nrfx_twim_init(&twim_inst, &twim_config, NULL, NULL);
  if (err != NRFX_SUCCESS) {
    while (1)
      ;
  }

  nrfx_twim_enable(&twim_inst);
  IRQ_CONNECT(DT_IRQN(I2C0_DEV_NODE), DT_IRQ(I2C0_DEV_NODE, priority), nrfx_isr,
              nrfx_twim_0_irq_handler, 0);
}

    Thanks in advance, fingers crossed for helping me solving that  Wink

  • 0 in reply to pwpot

    Sorry for the late reply, I have been out of office. Thank you for the latest summary, I will go through this and get back to you.

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