How to send sensor data using AT commands to a device using Uart in segger embedded studio

[Rajbir Singh]

Hi, I am new to NRF and segger embedded studio.

So I want to send temperature sensor data connected with nrf52840 DK to the Murata1_SC  device using UART.

The data will be sent using AT Commands.

So how to send AT Commands in Segger embedded studio.

Thank you for the help in advance.

[Rajbir Singh]

I have tested uart example, but i don't know how to send commands

Here is my code

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "app_uart.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf.h"
#include "bsp.h"
#include "nrf_uart.h"

#define UART_TX_BUFF_SIZE 128
#define UART_RX_BUFF_SIZE 128

#define UART_HWFC APP_UART_FLOW_CONTROL_DISABLED

void uart_err_handle(app_uart_evt_type_t * p)
{

}

int main(void)
{
uint32_t err_code;

bsp_board_init(BSP_INIT_LEDS);

const app_uart_comm_params_t com_params =
{
RX_PIN_NUMBER,
TX_PIN_NUMBER,
RTS_PIN_NUMBER,
CTS_PIN_NUMBER,
UART_HWFC,
false,
NRF_UART_BAUDRATE_115200
};

APP_UART_FIFO_INIT(&com_params, UART_RX_BUFF_SIZE, UART_TX_BUFF_SIZE, uart_err_handle, APP_IRQ_PRIORITY_LOWEST, err_code);

APP_ERROR_CHECK(err_code);

printf("Hello PC from Nordic Device!!!\r\n");

while(true)
{
uint8_t cr;

while(app_uart_get(&cr) != NRF_SUCCESS);//wait here for the character from pc
if(cr == 'o')
{
bsp_board_leds_on();
printf("Leds are ON\r\n");
}
if(cr == 'f')
{
bsp_board_leds_off();
printf("Leds are OFF\r\n");
}
}
}

[Rajbir Singh]

In this example, I have received commands from pc and just sent responses back, but here i want to send a command from nrf52 and receive a response

[awneil]

[Rajbir Singh]

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "app_uart.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf.h"
#include "bsp.h"
#include "nrf_uart.h"

#define UART_TX_BUFF_SIZE 128
#define UART_RX_BUFF_SIZE 128

#define UART_HWFC APP_UART_FLOW_CONTROL_DISABLED

void uart_err_handle(app_uart_evt_type_t * p)
{
  

}

int main(void)
{
  uint32_t err_code;

  bsp_board_init(BSP_INIT_LEDS);
  
  const app_uart_comm_params_t com_params = 
   {
    RX_PIN_NUMBER,
    TX_PIN_NUMBER,
    RTS_PIN_NUMBER,
    CTS_PIN_NUMBER,
    UART_HWFC,
    false,
    NRF_UART_BAUDRATE_115200
    };

  APP_UART_FIFO_INIT(&com_params, UART_RX_BUFF_SIZE, UART_TX_BUFF_SIZE, uart_err_handle, APP_IRQ_PRIORITY_LOWEST, err_code);

  APP_ERROR_CHECK(err_code);
  
  printf("Hello PC from Nordic Device!!!\r\n");
  
  while(true)
  {
    uint8_t cr;

    while(app_uart_get(&cr) != NRF_SUCCESS);//wait here for the character from pc
    if(cr == 'o')
    {
      bsp_board_leds_on();
      printf("Leds are ON\r\n");
    }
    if(cr == 'f')
    {
      bsp_board_leds_off();
      printf("Leds are OFF\r\n");
    }
  }
}

[awneil]

Rajbir Singh said:

Please help!

please pay attention to the advice being given:

awneil said:

start with  just sending text strings to a terminal.

Then do receiving text strings from a terminal

Hung Bui said:

Before trying to send AT command, please get familiar with how you can use UART

Don't leap straight into AT Commands before you have thoroughly understood how to use the UART to send strings, and receive strings.

See: www.avrfreaks.net/.../1138166