御神楽的学习记录之基于I2C协议的AHT20温湿度传感器的数据采集
作者：互联网
文章目录
前言
I2C 总线支持任何IC 生产过程(NMOS CMOS、双极性）。两线――**串行数据（SDA）和串行时钟 （SCL）**线在连接到总线的器件间传递信息。每个器件都有一个唯一的地址识别（无论是微控制器——MCU、LCD 驱动器、存储器或键盘接口），而且都可以作为一个发送器或接收器（由器件的功能决定）。
提示：以下是本篇文章正文内容，下面案例可供参考
一、I2C 协议
1.简介
**I2C 通讯协议(Inter－Integrated Circuit)**是由 Phiilps 公司开发的，由于它引脚少，硬件实
现简单，可扩展性强，不需要 USART、CAN 等通讯协议的外部收发设备，现在被广泛地
使用在系统内多个集成电路(IC)间的通讯。
2.硬件I2C
硬件I2C对应芯片上的I2C外设，有相应I2C驱动电路，其所使用的I2C管脚也是专用的，因而效率要远高于软件模拟的I2C；一般也较为稳定，但是程序较为繁琐。
3.软件I2C
软件I2C一般是用GPIO管脚，用软件控制管脚状态以模拟I2C通信波形。
二、温湿度传感器的数据采集
1、新建项目
1、新建stm32cuber项目
2、设置项目
2.项目代码
1、导入AHT20函数库
1、导入头文件和c文件
2、添加头文件引入路径
2、修改AHT20.c代码
将函数本地库改为HAL库相应代码
void SDA_Pin_Output_High(void) //将PB15配置为输出 ， 并设置为高电平， PB15作为I2C的SDA
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//推挽输出
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;;
HAL_GPIO_Init(GPIOB,& GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET);
}
void SDA_Pin_Output_Low(void) //将P15配置为输出 并设置为低电平
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//推挽输出
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB,& GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_RESET);
}
void SDA_Pin_IN_FLOATING(void) //SDA配置为浮空输入
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;//
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init( GPIOB,&GPIO_InitStruct);
}
void SCL_Pin_Output_High(void) //SCL输出高电平，P14作为I2C的SCL
{
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
}
void SCL_Pin_Output_Low(void) //SCL输出低电平
{
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);
}
void Init_I2C_Sensor_Port(void) //初始化I2C接口,输出为高电平
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//推挽输出
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB,& GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET);
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//推挽输出
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Pin = GPIO_PIN_6;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB,& GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
}
3、main.c代码
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "i2c.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include<stdio.h>
#include "AHT20.h"
/* USER CODE END Includes */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE BEGIN 0 */
int fputc(int ch,FILE *f)
{
HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,0xFFFF);
//等待发送结束
while(__HAL_UART_GET_FLAG(&huart1,UART_FLAG_TC)!=SET){
}
return ch;
}
/* USER CODE END 0 */
int main(void)
{
/* USER CODE BEGIN 1 */
uint32_t CT_data[2]={0,0};
volatile int c1,t1;
Delay_1ms(500);
/* 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 */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
// MX_I2C1_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
AHT20_Init();
Delay_1ms(500);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
AHT20_Read_CTdata(CT_data);
c1 = CT_data[0]*1000/1024/1024; //计算得到湿度值c1（放大了10倍）
t1 = CT_data[1]*2000/1024/1024-500;//计算得到温度值t1（放大了10倍）
printf("正在检测");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
printf("\r\n");
HAL_Delay(1000);
printf("温度:%d%d.%d",t1/100,(t1/10)%10,t1%10);
printf("湿度:%d%d.%d",c1/100,(c1/10)%10,c1%10);
printf("\r\n");
printf("等待");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
HAL_Delay(100);
printf(".");
printf("\r\n");
HAL_Delay(1000);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
3.采集展示
参考
https://blog.csdn.net/qq_47281915?spm=1001.2014.3001.5509
标签：HAL,温湿度,printf,Delay,AHT20,InitStruct,GPIO,I2C,RCC 来源： https://blog.csdn.net/YuKaguraNe/article/details/121503439