MLX90614非接触温度测量传感器测温探头，常用来制作额温测试。
硬件连接方式如下：
MLX90614的c语言驱动如下：
#include "MLX90614_Driver.h" #include "SysTick_Driver.h" #include "stdint.h" #define ACK 0 //应答 #define NACK 1 //无应答 #define SA 0x00 //Slave address 单个MLX90614时地址为0x00,多个时地址默认为0x5a #define RAM_ACCESS 0x00 //RAM access command RAM存取命令 #define EEPROM_ACCESS 0x20 //EEPROM access command EEPROM存取命令 #define RAM_TOBJ1 0x07 //To1 address in the eeprom 目标1温度,检测到的红外温度 -70.01 ~ 382.19度 #define SMBUS_PORT GPIOB //PB端口(端口和下面的两个针脚可自定义) #define SMBUS_SCK GPIO_PIN_9 //PB10：SCL #define SMBUS_SDA GPIO_PIN_8 //PB11：SDA #define MLX90614_GPIO_CLK_ENABLE() __HAL_RCC_GPIOB_CLK_ENABLE() //SCL 引脚宏定义 #define SMBUS_SCK_H() HAL_GPIO_WritePin(SMBUS_PORT, SMBUS_SCK,GPIO_PIN_SET)//置高电平 #define SMBUS_SCK_L() HAL_GPIO_WritePin(SMBUS_PORT, SMBUS_SCK,GPIO_PIN_RESET)//置低电平 //SDA 引脚宏定义 #define SMBUS_SDA_H() HAL_GPIO_WritePin(SMBUS_PORT, SMBUS_SDA,GPIO_PIN_SET) #define SMBUS_SDA_L() HAL_GPIO_WritePin(SMBUS_PORT, SMBUS_SDA,GPIO_PIN_RESET) //#define SMBUS_SDA_PIN() SMBUS_PORT->IDR & SMBUS_SDA //读取引脚电平 #define SMBUS_SDA_PIN() HAL_GPIO_ReadPin(SMBUS_PORT, SMBUS_SDA) /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /******************************************************************************* * Function Name : SMBus_StartBit * Description : Generate START condition on SMBus * Input : None * Output : None * Return : None *******************************************************************************/ void SMBus_StartBit(void) { SMBUS_SDA_H(); // Set SDA line SMBus_Delay(1); // Wait a few microseconds SMBUS_SCK_H(); // Set SCL line SMBus_Delay(5); // Generate bus free time between Stop SMBUS_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)在SCK=1时，检测到SDA由1到0表示通信开始（下降沿） SMBUS_SCK_L(); // Clear SCL 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) { SMBUS_SCK_L(); // Clear SCL line SMBus_Delay(5); // Wait a few microseconds SMBUS_SDA_L(); // Clear SDA line SMBus_Delay(5); // Wait a few microseconds SMBUS_SCK_H(); // Set SCL line SMBus_Delay(10); // Stop condition setup time(Tsu:sto=4.0us min) SMBUS_SDA_H(); // Set SDA line在SCK=1时，检测到SDA由0到1表示通信结束（上升沿） } /******************************************************************************* * Function Name : SMBus_SendByte * Description : Send a byte on SMBus * Input : Tx_buffer * Output : None * Return : None *******************************************************************************/ uint8_t SMBus_SendByte(uint16_t Tx_buffer) { uint8_t Bit_counter; uint8_t Ack_bit; uint8_t 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 82.5kHz * Input : bit_out * Output : None * Return : None *******************************************************************************/ void SMBus_SendBit(uint8_t bit_out) { if(bit_out==0) { SMBUS_SDA_L(); } else { SMBUS_SDA_H(); } SMBus_Delay(2); // Tsu:dat = 250ns minimum SMBUS_SCK_H(); // Set SCL line SMBus_Delay(10); // High Level of Clock Pulse SMBUS_SCK_L(); // Clear SCL 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 *******************************************************************************/ uint8_t SMBus_ReceiveBit(void) { uint8_t Ack_bit; SMBUS_SDA_H(); //引脚靠外部电阻上拉，当作输入 // SMBus_Delay(2); // High Level of Clock Pulse SMBUS_SCK_H(); // Set SCL line SMBus_Delay(2); // High Level of Clock Pulse if (SMBUS_SDA_PIN()) { Ack_bit=1; } else { Ack_bit=0; } SMBUS_SCK_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 *******************************************************************************/ uint8_t SMBus_ReceiveByte(uint8_t ack_nack) { uint8_t RX_buffer; uint8_t 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 : 延时 一次循环约1us * Input : time * Output : None * Return : None *******************************************************************************/ void SMBus_Delay(uint16_t time) { uint16_t i, j; for (i=0; i<4; i++) { for (j=0; j<time; j++); } } /******************************************************************************* * Function Name : SMBus_Init * Description : SMBus初始化 * Input : None * Output : None * Return : None *******************************************************************************/ void SMBus_Init() { /* Enable SMBUS_PORT clocks */ GPIO_InitTypeDef GPIO_InitStruct; //声明一个结构体变量 MLX90614_GPIO_CLK_ENABLE();//非接触温度传感器SDAL 连接PB.15,SCL连接PB.14---打开GPIOD时钟 // 温度传感器引脚配置 GPIO_InitStruct.Pin = (SMBUS_SCK|SMBUS_SDA); //非接触温度传感器SDAL GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; //管脚频率为50MHZ GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD; //输出模式为 GPIO_InitStruct.Pull = GPIO_PULLUP; //设置引脚为上拉模式 // GPIO_InitStruct.Pull =GPIO_NOPULL; HAL_GPIO_Init(GPIOB,&GPIO_InitStruct); //初始化PB 10/11 SMBUS_SCK_H(); SMBUS_SDA_H(); } /******************************************************************************* * Function Name : SMBus_ReadMemory * Description : READ DATA FROM RAM/EEPROM * Input : slaveAddress, command * Output : None * Return : Data *******************************************************************************/ uint16_t SMBus_ReadMemory(uint8_t slaveAddress, uint8_t command) { uint16_t data; // Data storage (DataH:DataL) uint8_t Pec; // PEC byte storage uint8_t DataL=0; // Low data byte storage uint8_t DataH=0; // High data byte storage uint8_t arr[6]; // Buffer for the sent bytes uint8_t PecReg; // Calculated PEC byte storage uint8_t ErrorCounter; // Defines the number of the attempts for communication with MLX90614 ErrorCounter=0x00; // Initialising of ErrorCounter slaveAddress <<= 1; //2-7位表示从机地址 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 最低位Wr=0表示接下来写命令 { 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 最低位Rd=1表示接下来读数据 { 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 *******************************************************************************/ uint8_t PEC_Calculation(uint8_t pec[]) { uint8_t crc[6]; uint8_t BitPosition=47; uint8_t shift; uint8_t i; uint8_t j; uint8_t 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) { float temp; temp = SMBus_ReadMemory(SA, RAM_ACCESS|RAM_TOBJ1)*0.02-273.15; //temp = SMBus_ReadMemory(0x00, 0x07)*0.02-273.15; return temp; } /*********************************END OF FILE*********************************/驱动保存为 "MLX90614_Driver.c"，再新建“MLX90614_Driver.h”并保存。
#ifndef __MLX90614_DRIVER_H_ #define __MLX90614_DRIVER_H_ #include "stm32f1xx.h" #include "stdint.h" //#define ACK 0 //#define NACK 1 //#define SA 0x00 //Slave address 单个MLX90614时地址为0x00,多个时地址默认为0x5a //#define RAM_ACCESS 0x00 //RAM access command //#define EEPROM_ACCESS 0x20 //EEPROM access command //#define RAM_TOBJ1 0x07 //To1 address in the eeprom void SMBus_StartBit(void); void SMBus_StopBit(void); void SMBus_SendBit(uint8_t); uint8_t SMBus_SendByte(uint16_t); uint8_t SMBus_ReceiveBit(void); uint8_t SMBus_ReceiveByte(uint8_t); void SMBus_Delay(uint16_t); void SMBus_Init(void); uint16_t SMBus_ReadMemory(uint8_t, uint8_t); uint8_t PEC_Calculation(uint8_t*); float SMBus_ReadTemp(void); //获取温度值 #endif在mian.c中声明引用#include "MLX90614_Driver.h"，并加入。
并在while (1)循环中加入：
Temperature = SMBus_ReadTemp(); //读取温度
