I need to use UART0 of the nRF9161 via Tx(P0.27) and Rx(P0.26) for serial communication. There is no CTS/RTS signal.
I used the code from Lesson 5 of the DevAcademy. i can't get it to work. The code right after int main(void) checking for device availability show no active (when tested in debug mode)
I have a feeling my code does not have right setup for the UART. I spent countless hours to debug and read to fix - but no luck.
i would appreciate if you can please review and provide recommendations for resultion.
BTw, the code complies and build to the end.
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/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
/* Controlling LEDs through UART. Press 1-3 on your keyboard to toggle LEDS 1-3 on your development kit */
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/sys/printk.h>
/* STEP 3 - Include the header file of the UART driver in main.c */
#include <zephyr/drivers/uart.h>
/*
*struct uart_config{
* uint32_t baudrate;
* uint8_t parity;
* uint8_t stop_bits;
* uint8_t data_bits;
* uint8_t flow_ctrl;
*};
*/
const struct uart_config uart_cfg = {
.baudrate = 9600,
.parity = UART_CFG_STOP_BITS_1,
.data_bits = UART_CFG_DATA_BITS_8,
.flow_ctrl = UART_CFG_FLOW_CTRL_NONE
};
/* 1000 msec = 1 sec */
#define SLEEP_TIME_MS 100
/* STEP 10.1.1 - Define the size of the receive buffer */
#define RECEIVE_BUFF_SIZE 113
/* STEP 10.2 - Define the receiving timeout period */
#define RECEIVE_TIMEOUT 100
/* STEP 5.1 - Get the device pointers of the LEDs through gpio_dt_spec */
/* The nRF7002dk has only 2 LEDs so this step uses a compile-time condition to reflect the DK you are building for */
#if defined (CONFIG_BOARD_NRF7002DK_NRF5340_CPUAPP)|| defined (CONFIG_BOARD_NRF7002DK_NRF5340_CPUAPP_NS)
static const struct gpio_dt_spec led0 = GPIO_DT_SPEC_GET(DT_ALIAS(led0), gpios);
static const struct gpio_dt_spec led1 = GPIO_DT_SPEC_GET(DT_ALIAS(led1), gpios);
#else
static const struct gpio_dt_spec led0 = GPIO_DT_SPEC_GET(DT_ALIAS(led0), gpios);
static const struct gpio_dt_spec led1 = GPIO_DT_SPEC_GET(DT_ALIAS(led1), gpios);
static const struct gpio_dt_spec led2 = GPIO_DT_SPEC_GET(DT_ALIAS(led2), gpios);
#endif
/* STEP 4.1 - Get the device pointer of the UART hardware */
const struct device *uart= DEVICE_DT_GET(DT_NODELABEL(uart0));
int uart_configure(const struct device *dev, const struct uart_config *cfg);
/* STEP 9.1 - Define the transmission buffer, which is a buffer to hold the data to be sent over UART */
static uint8_t tx_buf[] = {"nRF Connect SDK Fundamentals Course\n\r"
"Press 1-3 on your keyboard to toggle LEDS 1-3 on your development kit\n\r"};
/* STEP 10.1.2 - Define the receive buffer */
static uint8_t rx_buf[RECEIVE_BUFF_SIZE] = {0};
/* STEP 7 - Define the callback function for UART */
static void uart_cb(const struct device *dev, struct uart_event *evt, void *user_data)
{
switch (evt->type) {
case UART_RX_RDY:
#if defined (CONFIG_BOARD_NRF7002DK_NRF5340_CPUAPP)|| defined (CONFIG_BOARD_NRF7002DK_NRF5340_CPUAPP_NS)
if((evt->data.rx.len) == 1){
if(evt->data.rx.buf[evt->data.rx.offset] == '1')
gpio_pin_toggle_dt(&led0);
else if (evt->data.rx.buf[evt->data.rx.offset] == '2')
gpio_pin_toggle_dt(&led1);
}
#else
if((evt->data.rx.len) == 1){
if(evt->data.rx.buf[evt->data.rx.offset] == '1')
gpio_pin_toggle_dt(&led0);
else if (evt->data.rx.buf[evt->data.rx.offset] == '2')
gpio_pin_toggle_dt(&led1);
else if (evt->data.rx.buf[evt->data.rx.offset] == '3')
gpio_pin_toggle_dt(&led2);
}
#endif
break;
case UART_RX_DISABLED:
uart_rx_enable(dev ,rx_buf,sizeof rx_buf,RECEIVE_TIMEOUT);
break;
default:
break;
}
}
int main(void)
{
int ret;
int err = uart_configure (uart, &uart_cfg);
if (err == -ENOSYS) {
return -ENOSYS;
}
/* STEP 4.2 - Verify that the UART device is ready */
if (!device_is_ready(uart)){
printk("UART device not ready\r\n");
return 1 ;
}
/* STEP 5.2 - Verify that the LED devices are ready */
if (!device_is_ready(led0.port)){
printk("GPIO device is not ready\r\n");
return 1;
}
/* STEP 6 - Configure the GPIOs of the LEDs */
#if defined (CONFIG_BOARD_NRF7002DK_NRF5340_CPUAPP)|| defined (CONFIG_BOARD_NRF7002DK_NRF5340_CPUAPP_NS)
ret = gpio_pin_configure_dt(&led0, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
return 1 ;
}
ret = gpio_pin_configure_dt(&led1, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
return 1 ;
}
#else
ret = gpio_pin_configure_dt(&led0, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
return 1 ;
}
ret = gpio_pin_configure_dt(&led1, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
return 1 ;
}
ret = gpio_pin_configure_dt(&led2, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
return 1 ;
}
#endif
/* STEP 8 - Register the UART callback function */
ret = uart_callback_set(uart, uart_cb, NULL);
if (ret) {
return 1;
}
/* STEP 9.2 - Send the data over UART by calling uart_tx() */
ret = uart_tx(uart, tx_buf, sizeof(tx_buf), (-1));
if (ret) {
return 1;
}
/* STEP 10.3 - Start receiving by calling uart_rx_enable() and pass it the address of the receive buffer */
ret = uart_rx_enable(uart ,rx_buf,sizeof(rx_buf),(-1));
if (ret) {
return 1;
}
while (1) {
k_msleep(SLEEP_TIME_MS);
}
}
