一、AMG8833介绍
1简介
AMG8833是一种红外热像传感器,也被称为热感传感器。它可以用来检测和测量物体的热辐射,并将其转换为数字图像。AMG8833传感器可以感知的热源范围为-20°C到100°C,并能提供8x8的像素分辨率。它通过I2C接口与微控制器或单片机进行通信,并可提供实时温度图像数据。AMG8833传感器被广泛用于热成像、人体检测、温度测量等应用领域。
2、引脚图
二、原理图
三、源码
1、iic.h
#ifndef _MYIIC_H
#define _MYIIC_H
#include "sys.h"//IO方向设置
#define SDA_IN() {GPIOG->MODER&=~(3<<(12*2));GPIOG->MODER|=0<<12*2;} //PH5输入模式
#define SDA_OUT() {GPIOG->MODER&=~(3<<(12*2));GPIOG->MODER|=1<<12*2;} //PH5输出模式
//IO操作
#define IIC_SCL(n) (n?HAL_GPIO_WritePin(GPIOG,GPIO_PIN_11,GPIO_PIN_SET):HAL_GPIO_WritePin(GPIOG,GPIO_PIN_11,GPIO_PIN_RESET)) //SCL
#define IIC_SDA(n) (n?HAL_GPIO_WritePin(GPIOG,GPIO_PIN_12,GPIO_PIN_SET):HAL_GPIO_WritePin(GPIOG,GPIO_PIN_12,GPIO_PIN_RESET)) //SDA
#define READ_SDA HAL_GPIO_ReadPin(GPIOG,GPIO_PIN_12) //输入SDA//IIC所有操作函数
void IIC_Init(void); //初始化IIC的IO口
void IIC_Start(void); //发送IIC开始信号
void IIC_Stop(void); //发送IIC停止信号
void IIC_Send_Byte(u8 txd); //IIC发送一个字节
u8 IIC_Read_Byte(unsigned char ack);//IIC读取一个字节
u8 IIC_Wait_Ack(void); //IIC等待ACK信号
void IIC_Ack(void); //IIC发送ACK信号
void IIC_NAck(void); //IIC不发送ACK信号void IIC_Write_One_Byte(u8 daddr,u8 addr,u8 data);
u8 IIC_Read_One_Byte(u8 daddr,u8 addr);
#endif
2、iic.c
#include "iic.h"
#include "delay.h"//IIC初始化
void IIC_Init(void)
{GPIO_InitTypeDef GPIO_Initure;__HAL_RCC_GPIOG_CLK_ENABLE(); //使能GPIOH时钟//PH4,5初始化设置GPIO_Initure.Pin=GPIO_PIN_11|GPIO_PIN_12;GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP; //推挽输出GPIO_Initure.Pull=GPIO_PULLUP; //上拉GPIO_Initure.Speed=GPIO_SPEED_FREQ_VERY_HIGH; //快速HAL_GPIO_Init(GPIOG,&GPIO_Initure);IIC_SDA(1);IIC_SCL(1);
}//产生IIC起始信号
void IIC_Start(void)
{SDA_OUT(); //sda线输出IIC_SDA(1); IIC_SCL(1);delay_us(4);IIC_SDA(0);//START:when CLK is high,DATA change form high to low delay_us(4);IIC_SCL(0);//钳住I2C总线,准备发送或接收数据
}
//产生IIC停止信号
void IIC_Stop(void)
{SDA_OUT();//sda线输出IIC_SCL(0);IIC_SDA(0);//STOP:when CLK is high DATA change form low to highdelay_us(4);IIC_SCL(1); IIC_SDA(1);//发送I2C总线结束信号delay_us(4);
}
//等待应答信号到来
//返回值:1,接收应答失败
// 0,接收应答成功
u8 IIC_Wait_Ack(void)
{u8 ucErrTime=0;SDA_IN(); //SDA设置为输入 IIC_SDA(1);delay_us(1); IIC_SCL(1);delay_us(1); while(READ_SDA){ucErrTime++;if(ucErrTime>250){IIC_Stop();return 1;}}IIC_SCL(0);//时钟输出0 return 0;
}
//产生ACK应答
void IIC_Ack(void)
{IIC_SCL(0);SDA_OUT();IIC_SDA(0);delay_us(2);IIC_SCL(1);delay_us(2);IIC_SCL(0);
}
//不产生ACK应答
void IIC_NAck(void)
{IIC_SCL(0);SDA_OUT();IIC_SDA(1);delay_us(2);IIC_SCL(1);delay_us(2);IIC_SCL(0);
}
//IIC发送一个字节
//返回从机有无应答
//1,有应答
//0,无应答
void IIC_Send_Byte(u8 txd)
{ u8 t; SDA_OUT(); IIC_SCL(0);//拉低时钟开始数据传输for(t=0;t<8;t++){ IIC_SDA((txd&0x80)>>7);txd<<=1; delay_us(2); //对TEA5767这三个延时都是必须的IIC_SCL(1);delay_us(2); IIC_SCL(0); delay_us(2);}
}
//读1个字节,ack=1时,发送ACK,ack=0,发送nACK
u8 IIC_Read_Byte(unsigned char ack)
{unsigned char i,receive=0;SDA_IN();//SDA设置为输入for(i=0;i<8;i++ ){IIC_SCL(0); delay_us(2);IIC_SCL(1);receive<<=1;if(READ_SDA)receive++; delay_us(1); } if (!ack)IIC_NAck();//发送nACKelseIIC_Ack(); //发送ACK return receive;
}
3、amg8833.h
#ifndef __AMG8833_H
#define __AMG8833_H
#include "sys.h"
#include "myiic.h"#define STATUS_OK 0x00
#define STATUS_FAIL 0x01#define AMG88xx_PIXEL_TEMP_CONVERSION 0.25f
#define AMG88xx_THERMISTOR_CONVERSION 0.0625fenum
{AMG88xx_PCTL = 0x00,AMG88xx_RST = 0x01,AMG88xx_FPSC = 0x02,AMG88xx_INTC = 0x03,AMG88xx_STAT = 0x04,AMG88xx_SCLR = 0x05,//0x06 reservedAMG88xx_AVE = 0x07,AMG88xx_INTHL = 0x08,AMG88xx_INTHH = 0x09,AMG88xx_INTLL = 0x0A,AMG88xx_INTLH = 0x0B,AMG88xx_IHYSL = 0x0C,AMG88xx_IHYSH = 0x0D,AMG88xx_TTHL = 0x0E,AMG88xx_TTHH = 0x0F,AMG88xx_INT_OFFSET = 0x010,AMG88xx_PIXEL_OFFSET = 0x80
};enum power_modes{AMG88xx_NORMAL_MODE = 0x00,AMG88xx_SLEEP_MODE = 0x01,AMG88xx_STAND_BY_60 = 0x20,AMG88xx_STAND_BY_10 = 0x21
};enum sw_resets {AMG88xx_FLAG_RESET = 0x30,AMG88xx_INITIAL_RESET = 0x3F
};enum frame_rates {AMG88xx_FPS_10 = 0x00,AMG88xx_FPS_1 = 0x01
};enum int_enables{AMG88xx_INT_DISABLED = 0x00,AMG88xx_INT_ENABLED = 0x01
};enum int_modes {AMG88xx_DIFFERENCE = 0x00,AMG88xx_ABSOLUTE_VALUE = 0x01
};void amg8833_init(uint8_t slaveAddress);
float amg8833_read_thermistor(uint8_t slaveAddress);
void amg8833_read_pixels(uint8_t slaveAddress,float *buf, uint8_t size);#endif
4、amg8833.c
#include "amg8833.h"
#include "delay.h"//IIC写一个字节数据
uint8_t amg8833_write_1byte(uint8_t slaveAddress, uint8_t reg,uint8_t data)
{IIC_Start();IIC_Send_Byte(slaveAddress<<1);if(IIC_Wait_Ack()){IIC_Stop();//释放总线return 1;//没应答则退出}IIC_Send_Byte(reg);IIC_Wait_Ack(); delay_us(5);IIC_Send_Byte(data);IIC_Wait_Ack(); IIC_Stop();return 0;
}//IIC读一个字节数据
uint8_t amg8833_read_1byte(uint8_t slaveAddress, uint8_t reg,uint8_t *data)
{IIC_Start();IIC_Send_Byte(slaveAddress<<1);//发写命令if(IIC_Wait_Ack()){IIC_Stop();//释放总线return 1;//没应答则退出} IIC_Send_Byte(reg);IIC_Wait_Ack();delay_us(5);IIC_Start(); IIC_Send_Byte((slaveAddress<<1)|0x01);//发读命令IIC_Wait_Ack();*data = IIC_Read_Byte(0);IIC_Stop();return 0;
}//I2C读多个字节数据
uint8_t amg8833_read_nbyte(uint8_t slaveAddress, uint8_t reg, uint8_t *buf, uint16_t len)
{IIC_Start();IIC_Send_Byte(slaveAddress<<1);//发写命令if(IIC_Wait_Ack()) {IIC_Stop();//释放总线return 1;//没应答则退出}IIC_Send_Byte(reg);IIC_Wait_Ack();delay_us(5);IIC_Start(); IIC_Send_Byte((slaveAddress<<1)|0x01);//发读命令IIC_Wait_Ack();while(len){if(1 == len){*buf = IIC_Read_Byte(0);}else{*buf = IIC_Read_Byte(1);}buf++;len--;}IIC_Stop();return STATUS_OK;
}//I2C写多个字节数据
uint8_t amg8833_write_nbyte(uint8_t slaveAddress, uint8_t reg, uint8_t *buf, uint16_t len)
{IIC_Start();IIC_Send_Byte(slaveAddress<<1);//发写命令if(IIC_Wait_Ack()) {IIC_Stop();//释放总线return 1;//没应答则退出}IIC_Send_Byte(reg);IIC_Wait_Ack();while(len--){IIC_Send_Byte(*buf++);IIC_Wait_Ack();}IIC_Stop();return STATUS_OK;
}void amg8833_init(uint8_t slaveAddress)
{uint8_t read = 0xaa;//enter normal modeamg8833_write_1byte(slaveAddress,AMG88xx_PCTL,AMG88xx_NORMAL_MODE);//software resetamg8833_write_1byte(slaveAddress,AMG88xx_RST,AMG88xx_INITIAL_RESET);//set to 10 FPSamg8833_write_1byte(slaveAddress,AMG88xx_FPSC,AMG88xx_FPS_10);amg8833_read_1byte(slaveAddress, AMG88xx_FPSC,&read);printf("write = 0x%02x read = 0x%02x\r\n", AMG88xx_FPS_10,read);
}float signed_mag12_to_float(uint16_t val)
{//take first 11 bits as absolute valuint16_t absVal = (val & 0x7FF);return (val & 0x800) ? 0 - (float)absVal : (float)absVal ;
}float amg8833_read_thermistor(uint8_t slaveAddress)
{uint8_t raw[2];uint16_t recast;amg8833_read_nbyte(slaveAddress,AMG88xx_TTHL, raw, 2);recast = ((uint16_t)raw[1] << 8) | ((uint16_t)raw[0]);return signed_mag12_to_float(recast) * AMG88xx_THERMISTOR_CONVERSION;
}void amg8833_read_pixels(uint8_t slaveAddress,float *buf, uint8_t size)
{uint16_t recast;float converted;uint8_t rawArray[128],i;amg8833_read_nbyte(slaveAddress,AMG88xx_PIXEL_OFFSET,rawArray,128);for(i=0; i<size; i++){uint8_t pos = i << 1;recast = ((uint16_t)rawArray[pos + 1] << 8) | ((uint16_t)rawArray[pos]); converted = signed_mag12_to_float(recast) * AMG88xx_PIXEL_TEMP_CONVERSION;buf[i] = converted;}
}
四、使用方法
#include "sys.h"
#include "usart.h"
#include "delay.h"
#include "led.h"
#include "mpu.h"
#include "amg8833.h"int main(void)
{uint8_t slaveAddress = 0x69;float pixTempture[8][8];uint8_t i,j;Cache_Enable(); //打开L1-CacheHAL_Init(); //初始化HAL库Stm32_Clock_Init(160,5,2,4); //设置时钟,400Mhzdelay_init(400); //延时初始化uart_init(115200); //串口初始化led_init(); //初始化LED时钟MPU_Memory_Protection(); //保护相关存储区域IIC_Init();amg8833_init(slaveAddress);while(1){amg8833_read_pixels(slaveAddress,&pixTempture[0][0], 64);for(i=0;i<8;i++){for(j=0;j<8;j++){printf("%.2f ",pixTempture[i][j]);}printf("\r\n");}printf("\r\n");printf("\r\n");toggle_g_led();delay_ms(1000); }
}
五、工程源码
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