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初步实现 AHT20 温度湿度读取

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This commit is contained in:
lxbpxylps@126.com 2021-10-13 18:00:53 +08:00
parent ccdcd1e885
commit 1390298d0d
4 changed files with 199 additions and 29 deletions
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163
Hardware/aht20/aht20.c Normal file
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/**
* @file aht20.c
* @author Myth
* @version 0.1
* @date 2021.10.13
* @brief AHT20 驱动
*/
#include "systick.h"
#include "softi2c.h"
#include "aht20.h"
#define I2C_Start SoftI2C_Start(&aht20_i2c)
#define I2C_Stop SoftI2C_Stop(&aht20_i2c)
#define I2C_WriteByte(__byte__) SoftI2C_WriteByte(&aht20_i2c, __byte__)
#define I2C_ReadByte SoftI2C_ReadByte(&aht20_i2c)
#define I2C_Ack SoftI2C_Ack(&aht20_i2c)
#define I2C_NAck SoftI2C_NAck(&aht20_i2c)
#define I2C_WaitAck SoftI2C_WaitAck(&aht20_i2c)
SoftI2C_TypeDef aht20_i2c;
uint8_t AHT20_Read_Status(void);
/**
* @brief 初始化 AHT20
*/
void AHT20_Init(void)
{
aht20_i2c.SDA_GPIO = AHT20_GPIO;
aht20_i2c.SDA_Pin = AHT20_SDA_PIN;
aht20_i2c.SCL_GPIO = AHT20_GPIO;
aht20_i2c.SCL_Pin = AHT20_SCL_PIN;
aht20_i2c.Delay_Time = 5;
SoftI2C_Init(&aht20_i2c);
Delay_ms(500);
if (AHT20_Read_Status() & 0x18 == 0x18)
return;
I2C_Start;
I2C_WriteByte(0x70);
I2C_WaitAck;
I2C_WriteByte(0xa8);
I2C_WaitAck;
I2C_WriteByte(0x00);
I2C_WaitAck;
I2C_WriteByte(0x00);
I2C_WaitAck;
I2C_Stop;
Delay_ms(10);
I2C_Start;
I2C_WriteByte(0x70);
I2C_WaitAck;
I2C_WriteByte(0xbe);
I2C_WaitAck;
I2C_WriteByte(0x08);
I2C_WaitAck;
I2C_WriteByte(0x00);
I2C_WaitAck;
I2C_Stop;
Delay_ms(20);
}
/**
* @brief 读取 AHT20 状态字
* @retval 状态字
*/
uint8_t AHT20_Read_Status(void)
{
uint8_t data;
I2C_Start;
I2C_WriteByte(0x71);
I2C_WaitAck;
data = I2C_ReadByte;
I2C_NAck;
I2C_Stop;
return data;
}
/**
* @brief 读取 AHT20 数据
* @param humi: 浮点数指针，储存湿度
* @param temp: 浮点数指针，储存温度
* @retval 读取成功返回 1，读取失败返回 0
*/
uint8_t AHT20_Read(float *humi, float *temp)
{
uint8_t byte1 = 0;
uint8_t byte2 = 0;
uint8_t byte3 = 0;
uint8_t byte4 = 0;
uint8_t byte5 = 0;
uint8_t byte6 = 0;
uint32_t data32 = 0;
//发送 AC 指令请求数据
I2C_Start;
I2C_WriteByte(0x70);
I2C_WaitAck;
I2C_WriteByte(0xac);
I2C_WaitAck;
I2C_WriteByte(0x33);
I2C_WaitAck;
I2C_WriteByte(0x00);
I2C_WaitAck;
I2C_Stop;
Delay_ms(80); //延时 80ms，等待 AHT20 生成数据
uint16_t count = 0;
while (((AHT20_Read_Status() & 0x80) == 0x80)) //等待状态字最高位变为 1，说明数据准备完成
{
Delay_ms(1);
if (count++ >= 100)
return 0;
}
I2C_Start;
I2C_WriteByte(0x71);
I2C_WaitAck;
byte1 = I2C_ReadByte; //状态字
I2C_Ack;
byte2 = I2C_ReadByte; //湿度数据
I2C_Ack;
byte3 = I2C_ReadByte; //湿度数据
I2C_Ack;
byte4 = I2C_ReadByte; //湿度/温度数据
I2C_Ack;
byte5 = I2C_ReadByte; //温度数据
I2C_Ack;
byte6 = I2C_ReadByte; //温度数据
I2C_NAck;
I2C_Stop;
data32 = (data32 | byte2) << 8;
data32 = (data32 | byte3) << 8;
data32 = (data32 | byte4);
data32 = data32 >> 4;
*humi = (float)data32 * 100.0 / 1024.0 / 1024.0; //湿度
data32 = 0;
data32 = (data32 | byte4) << 8;
data32 = (data32 | byte5) << 8;
data32 = (data32 | byte6);
data32 = data32 & 0xfffff;
*temp = ((float)data32 * 200 * 10 / 1024 / 1024 - 500) / 10.0; //温度
return 1;
}

21
Hardware/aht20/aht20.h Normal file
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/**
* @file aht20.h
* @author Myth
* @version 0.1
* @date 2021.10.13
* @brief AHT20 驱动
*/
#ifndef __AHT20_H
#define __AHT20_H
#include "sys.h"
#define AHT20_GPIO GPIOB
#define AHT20_SDA_PIN GPIO_PIN_3
#define AHT20_SCL_PIN GPIO_PIN_4
void AHT20_Init(void);
uint8_t AHT20_Read(float *humi, float *temp);
#endif

7
Project/SlaveNode.uvprojx
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@ -339,7 +339,7 @@
<MiscControls></MiscControls>
<Define>USE_HAL_DRIVER, STM32F103x6</Define>
<Undefine></Undefine>
<IncludePath>..\Core;..\Libraries\HAL_Lib\Inc;..\Libraries\SoftSPI_HAL_Lib;..\Libraries\SoftI2C_HAL_Lib;..\User\Main;..\System\sys;..\System\systick;..\System\uart;..\Hardware\led</IncludePath>
<IncludePath>..\Core;..\Libraries\HAL_Lib\Inc;..\Libraries\SoftSPI_HAL_Lib;..\Libraries\SoftI2C_HAL_Lib;..\User\Main;..\System\sys;..\System\systick;..\System\uart;..\Hardware\led;..\Hardware\aht20</IncludePath>
</VariousControls>
</Cads>
<Aads>
@ -693,6 +693,11 @@
<FileType>1</FileType>
<FilePath>..\Hardware\led\led.c</FilePath>
</File>
<File>
<FileName>aht20.c</FileName>
<FileType>1</FileType>
<FilePath>..\Hardware\aht20\aht20.c</FilePath>
</File>
</Files>
</Group>
</Groups>

37
User/Main/main.c
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@ -8,6 +8,7 @@
* @note 此版本实现功能：
* 串口回显，回显时 PC13 上的 LED 闪烁
* 软件 I2C
* AHT20 温度湿度读取
* JTAG 已禁用，请使用 SWD 调试
*/
@ -18,6 +19,7 @@
#include "softi2c.h"
#include "led.h"
#include "aht20.h"
void Echo(uint8_t byte);
@ -36,39 +38,18 @@ int main(void)
UART_BindReceiveHandle(COM1, Echo); //绑定 COM1 串口接收中断至 Echo 函数
SoftI2C_TypeDef SoftI2C;
SoftI2C.SDA_GPIO = GPIOB;
SoftI2C.SDA_Pin = GPIO_PIN_3;
SoftI2C.SCL_GPIO = GPIOB;
SoftI2C.SCL_Pin = GPIO_PIN_4;
SoftI2C.Delay_Time = 10;
if (SoftI2C_Init(&SoftI2C) != HAL_OK) //初始化软件 I2C
{
Error_Handler(__FILE__, __LINE__); //错误处理
}
AHT20_Init(); //初始化 AHT20
float humi, temp;
while (1)
{
//程序主循环
SoftI2C_Start(&SoftI2C);
if (AHT20_Read(&humi, &temp)) //读取 AHT20
printf("humi: %.1f temp: %.1f\n", humi, temp);
else
printf("fail to read AHT20.\n");
SoftI2C_WriteByte(&SoftI2C, 0x10);
SoftI2C_WaitAck(&SoftI2C);
SoftI2C_WriteByte(&SoftI2C, 0x22);
SoftI2C_WaitAck(&SoftI2C);
SoftI2C_WriteByte(&SoftI2C, 0x33);
SoftI2C_WaitAck(&SoftI2C);
SoftI2C_WriteByte(&SoftI2C, 0x44);
SoftI2C_WaitAck(&SoftI2C);
SoftI2C_Stop(&SoftI2C);
Delay_us(1000);
Delay_ms(500);
}
return 1;