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⚔️先看效果
⚔️MLX90614 简介（资料来自商家文档）
MLX90614 存储器
RAM 
⚔️实验所需硬件
STM32开发板
GY-906测温模块
OLED屏幕(0.96寸)
⚔️驱动代码摘录
mlx90614.c
/* Includes ------------------------------------------------------------------*/
#include "mlx90614.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#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 GPIOA //PB端口(端口和下面的两个针脚可自定义)
#define SMBUS_SCK GPIO_Pin_5 //PB6：SCL
#define SMBUS_SDA GPIO_Pin_4 //PB7：SDA
#define RCC_APB2Periph_SMBUS_PORT RCC_APB2Periph_GPIOB
#define SMBUS_SCK_H() SMBUS_PORT->BSRR = SMBUS_SCK //置高电平
#define SMBUS_SCK_L() SMBUS_PORT->BRR = SMBUS_SCK //置低电平
#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(5); // 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(5); // 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(5); // 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(5); // 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
*******************************************************************************/
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 82.5kHz
* 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(6); // High Level of Clock Pulse
SMBUS_SCK_L(); // Clear SCL line
SMBus_Delay(3); // 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_Delay(2); // High Level of Clock Pulse
SMBUS_SCK_H(); // Set SCL line
SMBus_Delay(5); // High Level of Clock Pulse
if (SMBUS_SDA_PIN())
{
Ack_bit=1;
}
else
{
Ack_bit=0;
}
SMBUS_SCK_L(); // Clear SCL line
SMBus_Delay(3); // 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<time; 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)
{
float temp;
temp = SMBus_ReadMemory(SA, RAM_ACCESS|RAM_TOBJ1)*0.02-273.15;
return temp;
}
/*********************************END OF FILE*********************************/
mlx90614.h文章来源：https://www.toymoban.com/news/detail-601568.html
/*******************************************************************************
* 文件名 : mlx90614.h
* 作 者 :
* 版 本 :
* 日 期 : 2013-08-07
* 描 述 : mlx90614函数
*******************************************************************************/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __MLX90614_H
#define __MLX90614_H
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.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*********************************/
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