1.资源介绍
Tem |
MCU |
SCL |
PA12 |
SDA |
PA11 |
2.STM32CuBeMX配置
3.程序编写
#include "main.h"
#include "i2c.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
int fputc(int ch,FILE *p)
{
HAL_UART_Transmit(&huart2,(uint8_t *)&ch,1,0xffff);
return ch;
}
float STS30_Proc(void) //温度计程序
{
uint8_t tem_data[2];//写入数据缓冲区
float tem;
tem_data[0] = 0x24;
tem_data[1] = 0x0B;
HAL_I2C_Master_Transmit(&hi2c2, 0x4A<<1, tem_data, 2, 10);//开启温度转化 为下一次运行准备数据
HAL_Delay(100);
HAL_I2C_Master_Receive(&hi2c2, (0x4A << 1)+1, tem_data, 2, 10);//初始化时开启了一次温度转化 现在来读取 或者之前运行过的温度转化 现在读取
tem = (float)((tem_data[0] << 8 | tem_data[1]) * 175.0 / 65535 - 45); //计算并返回温度结果
return tem;
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
MX_USART2_UART_Init();
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_I2C2_Init();
/* USER CODE BEGIN 2 */
printf("this is tem init\r\n");
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
STS30_Proc();
printf("tem:%.2f\r\n",STS30_Proc());
HAL_Delay(500);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}