471 lines
8.4 KiB
C++
471 lines
8.4 KiB
C++
/* MLX90615.cpp
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MLX90615读写驱动
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驱动使用：
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1、调用begin()函数初始化。
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2、调用getTemp()获取温度值。
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对EERPOM的写操作只能通过地址0(？），写之前要擦除
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*/
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#include "Wire.h"
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#include "DuinoplusMLX90615.h"
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MLX90615::MLX90615(MODE rwMode)
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{
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}
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MLX90615::~MLX90615()
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{
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}
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/* begin()
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设备初始化
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输入参数：
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*/
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void MLX90615::begin(void)
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{
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Wire.begin();
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//Wire.setClock(50000); //IIC速度为50K
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device_addr = getAddr();
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}
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/* getAddr()
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获得地址前，可能预先不知器件地址，所以用地址0获取设备地址
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输入参数：
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返回值：设备地址
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*/
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uint8_t MLX90615::getAddr(void)
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{
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uint8_t temp[2];
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device_addr = 0; //从地址0读
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//device_addr = 0x5B; //从地址0读
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read(ADDRESS, temp);
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device_addr = temp[0];
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return temp[0];
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}
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/* setAddr()
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设置地址，通过地址0设置
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输入参数：
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uint8_t dat_L：数据低字节
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uint8_t dat_H：数据高字节
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*/
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void MLX90615::setAddr(uint8_t addr_L, uint8_t addr_H)
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{
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write(ADDRESS, addr_L, addr_H);
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device_addr = addr_L; //保存读到的地址
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}
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/* getEmissivity()
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获取红外测温修正系数
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输入参数：
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返回值：修正系数
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*/
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float MLX90615::getEmissivity(void)
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{
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uint8_t temp[2];
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uint16_t tmp;
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float tmp1;
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read(EMISSIVITY, temp);
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//Serial.write(temp[0]);
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//Serial.write(temp[1]);
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tmp = temp[1];
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tmp = (tmp << 8) + temp[0];
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tmp1 = ((float)tmp) / 16384;
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return tmp1;
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}
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/* setEmissivity()
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设置红外测温修正系数
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输入参数：
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float e：修正系数
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返回值：
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*/
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void MLX90615::setEmissivity(float e)
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{
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uint8_t temp[2];
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uint16_t tmp;
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float tmp1 = e;
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tmp = tmp1 * 16384;
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temp[0] = (uint8_t)(tmp & 0xFF);
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temp[1] = (uint8_t)((tmp & 0xFF00) >> 8);
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//Serial.write(temp[0]);
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//Serial.write(temp[1]);
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write(EMISSIVITY, temp[0], temp[1]);
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}
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/* getPWM_T_min()
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获得最小温度值，只适用PWM方式
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输入参数：
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返回值：最小温度值 单位：度
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*/
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float MLX90615::getPWM_T_min(void)
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{
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uint8_t temp[2];
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uint16_t tmp;
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float tmp1;
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read(PWM_T_MIN, temp);
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//Serial.write(temp[0]);
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//Serial.write(temp[1]);
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tmp = temp[1];
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tmp = (tmp << 8) + temp[0];
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tmp1 = ((float)tmp)*0.02 - 273.15;
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return tmp1;
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}
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/* setPWM_T_min()
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设置最小温度值，只适用PWM方式
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输入参数：最小温度值 单位：度
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返回值：
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*/
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void MLX90615::setPWM_T_min(float dat)
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{
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uint8_t temp[2];
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uint16_t tmp;
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float tmp1 = dat;
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if (tmp1 == 0)
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{
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temp[0] = 0x5B;
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temp[1] = 035;
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}
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else
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{
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tmp = (tmp1 + 273.15) * 50;
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temp[0] = (uint8_t)(tmp & 0xFF);
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temp[1] = (uint8_t)((tmp & 0xFF00) >> 8);
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}
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//Serial.write(temp[0]);
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//Serial.write(temp[1]);
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write(PWM_T_MIN, temp[0], temp[1]);
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device_addr = temp[0];
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}
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/* getPWM_T_range()
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获得测温范围，只适用PWM方式
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输入参数：
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返回值：测温范围值 单位：度
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*/
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float MLX90615::getPWM_T_range(void)
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{
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uint8_t temp[2];
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uint16_t tmp;
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float tmp1;
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read(PWM_T_RANGE, temp);
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//Serial.write(temp[0]);
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//Serial.write(temp[1]);
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tmp = temp[1];
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tmp = (tmp << 8) + temp[0];
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tmp1 = ((float)tmp)*0.02;
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return tmp1;
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}
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/* setPWM_T_range()
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设置测温范围，只适用PWM方式
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输入参数：测温范围值 单位：度
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返回值：
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*/
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void MLX90615::setPWM_T_range(float dat)
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{
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uint8_t temp[2];
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uint16_t tmp;
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float tmp1 = dat;
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tmp = tmp1 * 50;
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temp[0] = (uint8_t)(tmp & 0xFF);
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temp[1] = (uint8_t)((tmp & 0xFF00) >> 8);
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//Serial.write(temp[0]);
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//Serial.write(temp[1]);
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write(PWM_T_RANGE, temp[0], temp[1]);
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}
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/* setConfig()
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设置config寄存器
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配置前，应把原来的值读出，3-11位的工厂设置是不能修改的。
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可选配置参数如下，各参数可或组合：
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1、通信方式 可选值： PWM（PWM 通信方式） IIC（SMBus 通信方式）
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2、PWM高低频选择 可选值： PWM_L 低频 PWM_H 高频
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3、PWM通信方式下测温目标选择 可选值： PWM_TEMP_TA 芯片 PWM_TEMP_TO 被测物体
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4、数字滤波参数选择 可选值： IIR_1 IIR_10 IIR_18 IIR_24 IIR_31 IIR_38 IIR_45
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输入参数：寄存器值
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返回值：
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*/
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void MLX90615::setConfig(uint16_t dat)
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{
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uint16_t configVal, tempVal;
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uint8_t temp[2];
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uint8_t i;
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configVal = getConfig();
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tempVal = configVal; //保存好工厂设置
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tempVal &= 0x0FF8;
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for (i = 0; i < 16; i++)
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{
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if (dat & (1 << i)) //对dat按位测试，判断其为0还是1
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{
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configVal |= (1 << i); //为1，把相应位置1
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}
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else
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{
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configVal &= ~((uint16_t)(1 << i));
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}
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}
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configVal &= 0xF007; //恢复工厂设置位，确保中厂设置不被修改
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configVal |= tempVal;
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// configVal |= 0x04E0;
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temp[0] = (uint8_t)(configVal & 0xFF);
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temp[1] = (uint8_t)((configVal & 0xFF00) >> 8);
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Serial.write(temp[0]);
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Serial.write(temp[1]);
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write(CONFIG, temp[0], temp[1]);
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}
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/* getConfig()
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设置config寄存器的值
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输入参数：
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返回值：寄存器值
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*/
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uint16_t MLX90615::getConfig(void)
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{
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uint8_t temp[2];
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uint16_t tmp;
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read(CONFIG, temp);
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//Serial.write(temp[0]);
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//Serial.write(temp[1]);
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tmp = temp[1];
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tmp = (tmp << 8) + temp[0];
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return tmp;
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}
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/* getIIR()
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获取数字滤波值
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输入参数：
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返回值：数字滤波值
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*/
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uint8_t MLX90615::getIIR(void)
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{
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}
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/* setIIR()
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设置数字滤波值
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输入参数：
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uint16_
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返回值：
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*/
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uint8_t MLX90615::setIIR(uint16_t )
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{
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}
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/* getID()
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获取产品ID号，共4字节
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返回值：ID号
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*/
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uint32_t MLX90615::getID(void)
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{
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uint32_t id;
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return id;
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}
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/* getTemp()
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获得温度值，单位：度
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两种通信方式从设备读取温度值：IIC和PWM
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输入参数：
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uint8_t cmd：命令
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uint8_t dat_L：数据低字节
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uint8_t dat_H：数据高字节
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*/
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float MLX90615::getTemp(TEMP temp)
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{
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uint16_t a;
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float tmp;
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uint8_t tmp1[2];
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if (rwMode == IIC_MODE) //IIC通信方式
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{
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if (temp == OBJ_TEMP)
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read(TEMP_TO, tmp1);
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else if (temp == CHIP_TEMP)
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read(TEMP_TA, tmp1);
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//Serial.write(tmp1[0]);
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//Serial.write(tmp1[1]);
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a = tmp1[1];
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a = (a << 8) + tmp1[0];
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tmp = (float)a*0.02 - 273.15;
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}
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else if (rwMode == PWM_MODE) //PWM通雠方式
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{
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}
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return tmp;
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}
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/* sleep()
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进入/退出睡眠模式
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输入参数：
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boolean sleepFlag：模式选择
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*/
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void MLX90615::sleep(boolean sleepFlag)
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{
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boolean flag = sleepFlag;
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if (flag == SLEEP_ON) //进入睡眠
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{
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}
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else //退出睡眠
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{
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}
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}
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/* PWM2IIC()
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PWM模式切换到IIC模式
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输入参数：
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*/
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void MLX90615::PWM2IIC(void)
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{
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pinMode(A5, OUTPUT);
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digitalWrite(A5, HIGH);
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delay(1000);
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digitalWrite(A5, LOW);
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delay(30);
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digitalWrite(A5, HIGH);
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delay(200);
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}
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/* erase()
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擦除,EEPROM数据更新时，通常先要执行擦除操作,即先把要修改的字清0
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输入参数：
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uint8_t cmd：擦除地址，对就相应命令
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*/
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void MLX90615::erase(uint8_t cmd)
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{
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write(cmd, 0, 0); //通过写0擦除
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delay(200);
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}
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/* write()
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把数据写入EEPROM，RAM通常只读，所以不会用到本函数
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数据的写入格式参照datasheet的Bus Protocol一章
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输入参数：
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uint8_t cmd：命令
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uint8_t dat_L：数据低字节
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uint8_t dat_H：数据高字节
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*/
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void MLX90615::write(uint8_t cmd, uint8_t dat_L, uint8_t dat_H)
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{
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uint8_t i;
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uint8_t buff[5];
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uint8_t tmp;
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tmp = device_addr;
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device_addr = 0; //擦、写操作只能通过地址0
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//Serial.println(device_addr);
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/*写之前先擦除*/
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buff[0] = device_addr;
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buff[1] = cmd;
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buff[2] = 0;
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buff[3] = 0;
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buff[4] = crc8(buff, 4);
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Wire.beginTransmission(device_addr);
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Wire.write(cmd);
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Wire.write(0); //擦除就是写0
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Wire.write(0);
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Wire.write(buff[4]);
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Wire.endTransmission();
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delay(1000); //注意加点延时，等待擦除完成
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/*擦除后写入数据*/
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buff[0] = device_addr;
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buff[1] = cmd;
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buff[2] = dat_L;
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buff[3] = dat_H;
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buff[4] = crc8(buff, 4);
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//for (i = 0; i < 5; i++) //测试
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//{
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// Serial.write(buff[i]);
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//}
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Wire.beginTransmission(device_addr);
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Wire.write(cmd);
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Wire.write(dat_L);
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Wire.write(dat_H);
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Wire.write(buff[4]);
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Wire.endTransmission();
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delay(1000); //注意加点延时，等待写完成
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device_addr = tmp;
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}
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/* read()
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把数据从EEPRO或RAM中读出来，数据是16位的。
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输入参数：
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uint8_t cmd：命令地址
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uint8_t *buffer：读出数据缓存
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*/
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uint8_t MLX90615::read(uint8_t cmd, uint8_t *buffer)
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{
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uint8_t buff[6];
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uint8_t i = 0;
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buff[0] = device_addr << 1;
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buff[1] = cmd;
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buff[2] = (device_addr << 1) + 1;
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Wire.beginTransmission(device_addr);
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Wire.write(cmd);
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Wire.endTransmission(0); // stop transmitting
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Wire.requestFrom(device_addr, 3); //从设备读3个字节，第1个字节为设备地址，第三个字节为CRC8校验。
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while (Wire.available()) {
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buff[i + 3] = Wire.read(); //设备地址码
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i++;
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}
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//for (i = 0; i < 6; i++) //测试
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//{
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// Serial.write(buff[i]);
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//}
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if (buff[5] == crc8(buff, 5)){
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*buffer = buff[3];
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*(buffer + 1) = buff[4];
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return 1;
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}
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else
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return 0;
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}
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/* crc8()
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CRC8校验
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输入参数：
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uint8_t *buf：待校验数据缓存
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uint8_t len：待校验字节数
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*/
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uint8_t MLX90615::crc8(uint8_t *buf, uint8_t len)
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{
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uint8_t i, l;
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uint16_t crc = 0;
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for (l = 0; l<len; l++)
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{
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crc ^= (buf[l] * 0x100);
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for (i = 0; i<8; i++)
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{
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if (crc & 0x8000)
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{
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crc ^= 0x8380;
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}
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crc *= 2;
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}
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}
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return(crc / 0x100);
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} |