veysel gokdemir Something useful on electronics
If we need to receive integer values from serial port, we can use “stdlib.h” as includes and then atoi, atof etc. functions to convert string values to integer or floating values.
Example:
Includes;
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
/* Includes ------------------------------------------------------------------*/ #include "main.h" #include "stm32f4xx_hal.h" #include <stdbool.h> #include <stdlib.h> // for atoi, atof functions /* USER CODE BEGIN Includes */ char rx_buffer[50], tx_buffer[50]; bool led_state=false; uint32_t value1 = 0; // integer value double value2 = 0; // floating value /* USER CODE END Includes */ |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 |
/* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { HAL_UART_Receive(&huart6, (uint8_t*)rx_buffer, 50, 500); value1 = atoi(rx_buffer); //convert string value into an integer value //value2 = atof(rx_buffer); //convert string value into a floating value // for example; value1 = 123 , value2 = 12.3 if(value1 == 123){ HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_SET); if(led_state != true) HAL_UART_Transmit(&huart6, (uint8_t *)tx_buffer, sprintf(tx_buffer, "Led is on\n"), 500); led_state = true; // clear rx buffer for(int i=0;i<50;i++) rx_buffer[i] = 0; } // for example; value1 = 456 , value2 = 4.56 else if(value1 == 456){ HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_RESET); if(led_state != false) HAL_UART_Transmit(&huart6, (uint8_t *)tx_buffer, sprintf(tx_buffer, "Led is off\n"), 500); led_state = false; // clear rx buffer for(int i=0;i<50;i++) rx_buffer[i] = 0; } /* USER CODE END WHILE */ } |
