Hello,
I am working on a custom pcb with nrf9160-SICA. I have UART SPI and GPIOs running fine but I am having a very difficult time with I2c (TWI).
Pins 8 and 9 are occupied by switch1 and switch 2 on the nrf9160DK so even simple pin toggle (GPIO low high every second) is not possible.
On my board pins 8 and 9 are clear and can do simple GPIO toggle. because of this I assume my issue is software.
When I use my logic analyzer I don't see any output except for some odd low bits every few seconds or no activity (pins 8 and 9 are HIGH).
I am using this example: https://github.com/sigurdnev/fw-nrfconnect-nrf/tree/i2c/samples/nrf9160/i2c_scanner
CMakeLists:
cmake_minimum_required(VERSION 3.13.1)
include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
project(i2c_scanner)
FILE(GLOB app_sources src/*.c)
target_sources(app PRIVATE ${app_sources})
nrf9160_pca10090.overlay
&i2c2 {
status = "ok";
sda-pin = <9>;
scl-pin = <8>;
clock-frequency = <I2C_BITRATE_STANDARD>;
};
nrf9160_pca10090.dts
/*
* Copyright (c) 2017 Linaro Limited
* Copyright (c) 2018 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
/dts-v1/;
#include <nordic/nrf9160_xxaa.dtsi>
/ {
model = "Nordic PCA10090 Dev Kit";
compatible = "nordic,pca10090-dk", "nordic,nrf9160-xxaa";
chosen {
zephyr,console = &uart0;
zephyr,i2c-accel = &i2c2;
zephyr,sram = &sram0;
zephyr,flash = &flash0;
};
aliases {
// led0 = &led0;
// led1 = &led1;
// led2 = &led2;
// led3 = &led3;
// sw0 = &button2;
// sw1 = &button3;
sw2 = &button0;
sw3 = &button1;
};
leds {
compatible = "gpio-leds";
// led0: led_0 {
// gpios = <&gpio0 2 GPIO_INT_ACTIVE_LOW>;
// label = "Green LED 0";
// };
// led1: led_1 {
// gpios = <&gpio0 3 GPIO_INT_ACTIVE_LOW>;
// label = "Green LED 1";
// };
// led2: led_2 {
// gpios = <&gpio0 4 GPIO_INT_ACTIVE_LOW>;
// label = "Green LED 2";
// };
// led3: led_3 {
// gpios = <&gpio0 5 GPIO_INT_ACTIVE_LOW>;
// label = "Green LED 3";
// };
};
buttons {
compatible = "gpio-keys";
button0: button_0 {
gpios = <&gpio0 6 GPIO_PUD_PULL_UP>; //gpios = <&gpio0 8 GPIO_PUD_PULL_UP>;
label = "Push button 1"; //label = "Switch 1";
};
button1: button_1 {
gpios = <&gpio0 7 GPIO_PUD_PULL_UP>; //gpios = <&gpio0 9 GPIO_PUD_PULL_UP>;
label = "Push button 2"; //label = "Switch 2";
};
// button2: button_2 {
// gpios = <&gpio0 6 GPIO_PUD_PULL_UP>;
// label = "Push button 1";
// };
// button3: button_3 {
// gpios = <&gpio0 7 GPIO_PUD_PULL_UP>;
// label = "Push button 2";
// };
};
sram0_bsd: memory@20010000 {
device_type = "memory";
compatible = "mmio-sram";
};
};
&uart0 {
status = "ok";
current-speed = <115200>;
tx-pin = <23>; //29
rx-pin = <24>; //28
//rts-pin = <27>;
//cts-pin = <26>;
};
&uart1 {
status = "ok";
current-speed = <9600>; //<115200>;
tx-pin = <11>; //1
rx-pin = <10>; //0
//rts-pin = <15>;
//cts-pin = <18>;
};
&spi3 {
status = "ok";
sck-pin = <0>;
mosi-pin = <30>;
miso-pin = <2>;
//ss-pin = <14>;
spi-max-frequency = <4000000>;
};
&gpiote {
status = "ok";
};
&gpio0 {
status = "ok";
};
//&i2c2 {
// status = "ok";
// sda-pin = <9>;
// scl-pin = <8>;
// clock-frequency = <I2C_BITRATE_STANDARD>;
//};
&timer0 {
status = "ok";
};
&flash0 {
/*
* For more information, see:
* http://docs.zephyrproject.org/devices/dts/flash_partitions.html
*/
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
boot_partition: partition@0 {
label = "mcuboot";
reg = <0x00000000 0x10000>;
};
slot0_partition: partition@10000 {
label = "image-0";
};
#if defined(CONFIG_ARM_TRUSTZONE_M)
slot0_ns_partition: partition@40000 {
label = "image-0-nonsecure";
};
#endif
slot1_partition: partition@80000 {
label = "image-1";
};
#if defined(CONFIG_ARM_TRUSTZONE_M)
slot1_ns_partition: partition@b0000 {
label = "image-1-nonsecure";
};
#endif
scratch_partition: partition@f0000 {
label = "image-scratch";
reg = <0x000f0000 0xa000>;
};
storage_partition: partition@fa000 {
label = "storage";
reg = <0x000fa000 0x00006000>;
};
};
};
#if defined(CONFIG_ARM_TRUSTZONE_M)
/ {
sram0_ns: memory@20020000 {
device_type = "memory";
compatible = "mmio-sram";
};
};
#endif
/* Include partition configuration file */
#include "nrf9160_pca10090_partition_conf.dts"
main.c
#include <nrf9160.h>
#include <zephyr.h>
#include <misc/printk.h>
#include <i2c.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <gpio.h>
#define I2C_ACCEL_WRITE_ADDR 0x32
#define I2C_ACCEL_READ_ADDR 0xAA //0x33
struct device * i2c_accel;
uint8_t WhoAmI = 0xaa; //0u;
uint8_t init_accelerometer(){
const char* const i2cName = "I2C_2";
i2c_accel = device_get_binding(i2cName);
// i2c_accel = device_get_binding("I2C_2");
if (!i2c_accel) {
printk("error\r\n");
return -1;
} else {
i2c_configure(i2c_accel, I2C_SPEED_SET(I2C_SPEED_STANDARD));
return 0;
}
}
struct device *dev;
void main(void)
{
dev = device_get_binding("GPIO_0");
/* Set LED pin as output */
gpio_pin_configure(dev, 16, GPIO_DIR_OUT);
gpio_pin_configure(dev, 17, GPIO_DIR_OUT);
gpio_pin_write(dev, 16, 1);
gpio_pin_write(dev, 17, 1);
printk("Hello, World!\r\n");
init_accelerometer();
while (1) {
printk("loop head\r\n");
if (i2c_reg_read_byte(i2c_accel, I2C_ACCEL_READ_ADDR, 0x0F, WhoAmI) != 0) {
printk("Error on i2c_read()\n");
}
//i2c_reg_read_byte(i2c_accel, X, 0x0F, WhoAmI);
printk("WhoAmI = %x\r\n", WhoAmI);
printk("enter sleep\r\n");
k_sleep(1000);
}
}
