前言
本文实现了利用GY906红外测温模块检测温度。通过定时器中断取平均获得更优的温度曲线。
一、GY906代码
c文件
#include "gy906.h"
/*******************************************************************************
* Function Name : Mlx90614_Configuration
* Description : Mlx90614_Configuration
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void Mlx96014_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;//SCL
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIOB,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;//SDA
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIOA,&GPIO_InitStructure);
SDA_H;
SCL_H;
}
/*******************************************************************************
* Function Name : SMBus_StartBit
* Description : Generate START condition on SMBus
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SMBus_StartBit(void)
{
SDA_H; // Set SDA line
SMBus_Delay(1); // Wait a few microseconds
SCL_H; // Set SCK line
SMBus_Delay(5); // Generate bus free time between Stop
SDA_L; // Clear SDA line
SMBus_Delay(10); // Hold time after (Repeated) Start
// Condition. After this period, the first clock is generated.
//(Thd:sta=4.0us min)
SCL_L; // Clear SCK line
SMBus_Delay(2); // Wait a few microseconds
}
/*******************************************************************************
* Function Name : SMBus_StopBit
* Description : Generate STOP condition on SMBus
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SMBus_StopBit(void)
{
SCL_L; // Clear SCK line
SMBus_Delay(5); // Wait a few microseconds
SDA_L; // Clear SDA line
SMBus_Delay(5); // Wait a few microseconds
SCL_H; // Set SCK line
SMBus_Delay(10); // Stop condition setup time(Tsu:sto=4.0us min)
SDA_H; // Set SDA line
}
/*******************************************************************************
* Function Name : SMBus_SendByte
* Description : Send a byte on SMBus
* Input : Tx_buffer
* Output : None
* Return : None
*******************************************************************************/
u8 SMBus_SendByte(u8 Tx_buffer)
{
u8 Bit_counter;
u8 Ack_bit;
u8 bit_out;
for(Bit_counter=8; Bit_counter; Bit_counter--)
{
if (Tx_buffer&0x80)
{
bit_out=1; // If the current bit of Tx_buffer is 1 set bit_out
}
else
{
bit_out=0; // else clear bit_out
}
SMBus_SendBit(bit_out); // Send the current bit on SDA
Tx_buffer<<=1; // Get next bit for checking
}
Ack_bit=SMBus_ReceiveBit(); // Get acknowledgment bit
return Ack_bit;
}
/*******************************************************************************
* Function Name : SMBus_SendBit
* Description : Send a bit on SMBus
* Input : bit_out
* Output : None
* Return : None
*******************************************************************************/
void SMBus_SendBit(u8 bit_out)
{
if(bit_out==0)
{
SDA_L;
}
else
{
SDA_H;
}
SMBus_Delay(2); // Tsu:dat = 250ns minimum
SCL_H; // Set SCK line
SMBus_Delay(10); // High Level of Clock Pulse
SCL_L; // Clear SCK line
SMBus_Delay(10); // Low Level of Clock Pulse
// SMBUS_SDA_H(); // Master release SDA line ,
return;
}
/*******************************************************************************
* Function Name : SMBus_ReceiveBit
* Description : Receive a bit on SMBus
* Input : None
* Output : None
* Return : Ack_bit
*******************************************************************************/
u8 SMBus_ReceiveBit(void)
{
u8 Ack_bit;
SDA_H; //?????????,????
SCL_H; // Set SCL line
SMBus_Delay(2); // High Level of Clock Pulse
if (SMBUS_SDA_PIN)
{
Ack_bit=1;
}
else
{
Ack_bit=0;
}
SCL_L; // Clear SCL line
SMBus_Delay(4); // Low Level of Clock Pulse
return Ack_bit;
}
/*******************************************************************************
* Function Name : SMBus_ReceiveByte
* Description : Receive a byte on SMBus
* Input : ack_nack
* Output : None
* Return : RX_buffer
*******************************************************************************/
u8 SMBus_ReceiveByte(u8 ack_nack)
{
u8 RX_buffer;
u8 Bit_Counter;
for(Bit_Counter=8; Bit_Counter; Bit_Counter--)
{
if(SMBus_ReceiveBit()) // Get a bit from the SDA line
{
RX_buffer <<= 1; // If the bit is HIGH save 1 in RX_buffer
RX_buffer |=0x01;
}
else
{
RX_buffer <<= 1; // If the bit is LOW save 0 in RX_buffer
RX_buffer &=0xfe;
}
}
SMBus_SendBit(ack_nack); // Sends acknowledgment bit
return RX_buffer;
}
/*******************************************************************************
* Function Name : SMBus_Delay
* Description : 1us
* Input : time
* Output : None
* Return : None
*******************************************************************************/
void SMBus_Delay(u16 time)
{
u16 i, j;
for (i=0; i<4; i++)
{
for (j=0; j<time; j++);
}
}
/*******************************************************************************
* Function Name : SMBus_ReadMemory
* Description : READ DATA FROM RAM/EEPROM
* Input : slaveAddress, command
* Output : None
* Return : Data
*******************************************************************************/
u16 SMBus_ReadMemory(u8 slaveAddress, u8 command)
{
u16 data; // Data storage (DataH:DataL)
u8 Pec; // PEC byte storage
u8 DataL=0; // Low data byte storage
u8 DataH=0; // High data byte storage
u8 arr[6]; // Buffer for the sent bytes
u8 PecReg; // Calculated PEC byte storage
u8 ErrorCounter; // Defines the number of the attempts for communication with MLX90614
ErrorCounter=0x00; // Initialising of ErrorCounter
slaveAddress <<= 1; //2-7???????
do
{
repeat:
SMBus_StopBit(); //If slave send NACK stop comunication
--ErrorCounter; //Pre-decrement ErrorCounter
if(!ErrorCounter) //ErrorCounter=0?
{
break; //Yes,go out from do-while{}
}
SMBus_StartBit(); //Start condition
if(SMBus_SendByte(slaveAddress))//Send SlaveAddress ???Wr=0????????
{
goto repeat; //Repeat comunication again
}
if(SMBus_SendByte(command)) //Send command
{
goto repeat; //Repeat comunication again
}
SMBus_StartBit(); //Repeated Start condition
if(SMBus_SendByte(slaveAddress+1)) //Send SlaveAddress ???Rd=1????????
{
goto repeat; //Repeat comunication again
}
DataL = SMBus_ReceiveByte(ACK); //Read low data,master must send ACK
DataH = SMBus_ReceiveByte(ACK); //Read high data,master must send ACK
Pec = SMBus_ReceiveByte(NACK); //Read PEC byte, master must send NACK
SMBus_StopBit(); //Stop condition
arr[5] = slaveAddress;
arr[4] = command;
arr[3] = slaveAddress+1; //Load array arr
arr[2] = DataL;
arr[1] = DataH;
arr[0] = 0;
PecReg=PEC_Calculation(arr); //Calculate CRC
}
while(PecReg != Pec); //If received and calculated CRC are equal go out from do-while{}
data = (DataH<<8) | DataL; //data=DataH:DataL
return data;
}
/*******************************************************************************
* Function Name : PEC_calculation
* Description : Calculates the PEC of received bytes
* Input : pec[]
* Output : None
* Return : pec[0]-this byte contains calculated crc value
*******************************************************************************/
u8 PEC_Calculation(u8 pec[])
{
u8 crc[6];
u8 BitPosition=47;
u8 shift;
u8 i;
u8 j;
u8 temp;
do
{
/*Load pattern value 0x000000000107*/
crc[5]=0;
crc[4]=0;
crc[3]=0;
crc[2]=0;
crc[1]=0x01;
crc[0]=0x07;
/*Set maximum bit position at 47 ( six bytes byte5...byte0,MSbit=47)*/
BitPosition=47;
/*Set shift position at 0*/
shift=0;
/*Find first "1" in the transmited message beginning from the MSByte byte5*/
i=5;
j=0;
while((pec[i]&(0x80>>j))==0 && i>0)
{
BitPosition--;
if(j<7)
{
j++;
}
else
{
j=0x00;
i--;
}
}/*End of while */
/*Get shift value for pattern value*/
shift=BitPosition-8;
/*Shift pattern value */
while(shift)
{
for(i=5; i<0xFF; i--)
{
if((crc[i-1]&0x80) && (i>0))
{
temp=1;
}
else
{
temp=0;
}
crc[i]<<=1;
crc[i]+=temp;
}/*End of for*/
shift--;
}/*End of while*/
/*Exclusive OR between pec and crc*/
for(i=0; i<=5; i++)
{
pec[i] ^=crc[i];
}/*End of for*/
}
while(BitPosition>8); /*End of do-while*/
return pec[0];
}
/*******************************************************************************
* Function Name : SMBus_ReadTemp
* Description : Calculate and return the temperature
* Input : None
* Output : None
* Return : SMBus_ReadMemory(0x00, 0x07)*0.02-273.15
*******************************************************************************/
float SMBus_ReadTemp(void)
{
return SMBus_ReadMemory(SA, RAM_ACCESS|RAM_TOBJ1)*0.02-273.15;
}
/*********************************END OF FILE*********************************/
h文件
#ifndef _GY906_H_
#define _GY906_H_
#include "delay.h"
#include "sys.h"
#define ACK 0
#define NACK 1
#define SA 0x00 //Slave address
#define RAM_ACCESS 0x00 //RAM access command
#define EEPROM_ACCESS 0x20 //EEPROM access command
#define RAM_TOBJ1 0x07 //To1 address in the eeprom
#define SDA_L GPIO_ResetBits(GPIOA, GPIO_Pin_8)
#define SDA_H GPIO_SetBits(GPIOA, GPIO_Pin_8)
#define SCL_H GPIO_SetBits(GPIOB, GPIO_Pin_15)
#define SCL_L GPIO_ResetBits(GPIOB, GPIO_Pin_15)
#define SMBUS_SDA_PIN GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_8)
void SMBus_StartBit(void);
void SMBus_StopBit(void);
void SMBus_SendBit(u8);
u8 SMBus_SendByte(u8);
u8 SMBus_ReceiveBit(void);
u8 SMBus_ReceiveByte(u8);
void SMBus_Delay(u16);
void SMBus_Init(void);
u16 SMBus_ReadMemory(u8, u8);
u8 PEC_Calculation(u8*);
float SMBus_ReadTemp(void);
void Mlx96014_Configuration(void);
#endif
二、定时器中断代码
#include "stm32f10x.h" //包含需要的头文件
#include "timer1.h"
#include "gy906.h"
/*-------------------------------------------------*/
/*函数名：定时器1使能1分钟定时 */
/*参 数：无 */
/*返回值：无 */
/*-------------------------------------------------*/
void TIM1_Time_Init(u16 arr,u16 psc)
{
//TIM1_Init(4999,7199);
//计数频率=Tclk/7200=72000000/7200=10000Hz 计一个数用时1/10000s 计数5000次=5000/10000s=500ms
//Tout(溢出时间)=(arr+1)*(psc+1)/Tclk =5000*7200/72000000s=500ms
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);//设置缺省值,这一步最好加上
TIM_TimeBaseStructure.TIM_Period = arr; //自动重装载寄存器周期的值，溢出值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //时钟频率预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:输入捕获模式用来滤波
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseStructure.TIM_RepetitionCounter=0;//设置重复溢出次数，就是多少次溢出后进入中断，一般为0，只有高级定时器才有用
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE ); //允许更新中断
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM1, ENABLE);
}
float Temperature=0;
/*-------------------------------------------------*/
/*函数名：串口1接收中断函数 */
/*参 数：无 */
/*返回值：无 */
/*-------------------------------------------------*/
void TIM1_UP_IRQHandler(void)
{
static u8 i=0;
static float add=0.0f;
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //检查更新中断发生与否
{
i++;
add+=SMBus_ReadTemp(); //得到温度数据
if(i>=50)
{
Temperature = add/50 + 1.5000;
add=0;
i=0;
}
TIM_ClearITPendingBit(TIM1, TIM_IT_Update); //清除TIMx更新中断标志
}
}
Temperature即为检测到的数据，精度还可以，只不过对于距离需要控制一下，大概5-10cm左右的距离。Temperature累加那里加上1.5000是增加1.5度的意思，这用于线性修正。我寻思我的体温是36.5度左右，测出来35，所以就加了一个修正系数哈哈哈。文章来源：https://www.toymoban.com/news/detail-837987.html
总结
三连支持博主，博主更新的动力源泉！！！文章来源地址https://www.toymoban.com/news/detail-837987.html
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