官方的例子是用PIC单片机来驱动的，考虑到STM32 用的人很多，我特意移植和修改成适合STM32跑的代码，以下是已验证过、可正常运行的MLX90614温度传感器的接口原理图和源代码（.h和.C文件）:
以下是头文件mlx90614.h
/*******************************************************************************
* 文件名 : mlx90614.h
* 作 者 : 从小就是电子迷
* 版 本 : V1.0
* 日 期 : 2020-02-25
* 描 述 : mlx90614函数
*******************************************************************************/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __MLX90614_H
#define __MLX90614_H
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
/* Exported types ------------------------------------------------------------*/
/* Exported variables --------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
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); //获取温度值
#endif
/*********************************END OF FILE*********************************/
以下是MLX90614.c 源程序：
/*******************************************************************************
* 文件名 : mlx90614.c
* 作 者 : 从小就是电子迷
* 版 本 : V1.0
* 日 期 : 2020-02-26
* 描 述 : mlx90614函数
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "mlx90614.h"
#include "lcd12864.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#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
#define SMBUS_PORT GPIOB
#define SMBUS_SCK GPIO_Pin_6
#define SMBUS_SDA GPIO_Pin_7
#define RCC_APB2Periph_SMBUS_PORT RCC_APB2Periph_GPIOB
#define SMBUS_SCK_H() SMBUS_PORT->BSRR = SMBUS_SCK
#define SMBUS_SCK_L() SMBUS_PORT->BRR = SMBUS_SCK
#define SMBUS_SDA_H() SMBUS_PORT->BSRR = SMBUS_SDA
#define SMBUS_SDA_L() SMBUS_PORT->BRR = SMBUS_SDA
#define SMBUS_SDA_PIN() SMBUS_PORT->IDR & SMBUS_SDA //读取引脚电平
/* 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)
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
}
/*******************************************************************************
* 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)
{
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
*******************************************************************************/
u8 SMBus_ReceiveBit(void)
{
u8 Ack_bit;
SMBUS_SDA_H(); //引脚靠外部电阻上拉，当作输入
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
*******************************************************************************/
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 : 延时 一次循环约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 } } /******************************************************************************* * Function Name : SMBus_Init * Description : SMBus初始化 * Input : None * Output : None * Return : None *******************************************************************************/ void SMBus_Init() { GPIO_InitTypeDef GPIO_InitStructure; /* Enable SMBUS_PORT clocks */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_SMBUS_PORT, ENABLE); /*配置SMBUS_SCK、SMBUS_SDA为集电极开漏输出*/ GPIO_InitStructure.GPIO_Pin = SMBUS_SCK | SMBUS_SDA; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(SMBUS_PORT, &GPIO_InitStructure); SMBUS_SCK_H(); SMBUS_SDA_H(); } /******************************************************************************* * 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 *******************************************************************************/ 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*********************************/ /******************************************************************************* * 文件名 : mlx90614.c * 作 者 : * 版 本 : * 日 期 : 2013-08-07 * 描 述 : mlx90614函数 *******************************************************************************/ /* Includes ------------------------------------------------------------------*/ #include "mlx90614.h" #include "lcd12864.h" /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ #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 #define SMBUS_PORT GPIOB #define SMBUS_SCK GPIO_Pin_6 #define SMBUS_SDA GPIO_Pin_7 #define RCC_APB2Periph_SMBUS_PORT RCC_APB2Periph_GPIOB #define SMBUS_SCK_H() SMBUS_PORT->BSRR = SMBUS_SCK #define SMBUS_SCK_L() SMBUS_PORT->BRR = SMBUS_SCK #define SMBUS_SDA_H() SMBUS_PORT->BSRR = SMBUS_SDA #define SMBUS_SDA_L() SMBUS_PORT->BRR = SMBUS_SDA #define SMBUS_SDA_PIN() SMBUS_PORT->IDR & SMBUS_SDA //读取引脚电平 /* 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) 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 } /******************************************************************************* * 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) { 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 *******************************************************************************/ u8 SMBus_ReceiveBit(void) { u8 Ack_bit; SMBUS_SDA_H(); //引脚靠外部电阻上拉，当作输入 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 *******************************************************************************/ 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 : 延时 一次循环约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 } } /******************************************************************************* * Function Name : SMBus_Init * Description : SMBus初始化 * Input : None * Output : None * Return : None *******************************************************************************/ void SMBus_Init() { GPIO_InitTypeDef GPIO_InitStructure; /* Enable SMBUS_PORT clocks */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_SMBUS_PORT, ENABLE); /*配置SMBUS_SCK、SMBUS_SDA为集电极开漏输出*/ GPIO_InitStructure.GPIO_Pin = SMBUS_SCK | SMBUS_SDA; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(SMBUS_PORT, &GPIO_InitStructure); SMBUS_SCK_H(); SMBUS_SDA_H(); } /******************************************************************************* * 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 *******************************************************************************/ 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*********************************/
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