TMP42x.c

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#include "TMP42x.h"
 
// Privates

TMP42x_Status __TMP42x_readByte(TMP42x* self, uint8_t MemAddress){
    uint8_t data;
    if(HAL_I2C_Mem_Read(self->hi2c, self->I2C_ADDR << 1, MemAddress, I2C_MEMADD_SIZE_8BIT, &data, 1, 1000)) return TMP42x_TimeOut;
    self->reg8.raw_data = data;
    return TMP42x_OK;
}

TMP42x_Status __TMP42x_writeByte(TMP42x* self, uint8_t MemAddress){
    uint8_t data[1];
    data[0] = self->reg8.raw_data;
    if(HAL_I2C_Mem_Write(self->hi2c, self->I2C_ADDR << 1, MemAddress, I2C_MEMADD_SIZE_8BIT, data, 1, 1000)) return TMP42x_TimeOut;
    return TMP42x_OK;
}

TMP42x_Status __TMP42x_readTwoBytes(TMP42x* self, uint8_t MemAddress){
    if(HAL_OK == HAL_I2C_Mem_Read(self->hi2c, self->I2C_ADDR << 1, MemAddress, I2C_MEMADD_SIZE_8BIT, self->reg16.raw_data, 2, 100)){
        
        self->reg16.raw_data[0] ^= self->reg16.raw_data[1];
        self->reg16.raw_data[1] ^= self->reg16.raw_data[0];
        self->reg16.raw_data[0] ^= self->reg16.raw_data[1];
        
        return TMP42x_OK;
    }
    else{
        return TMP42x_TimeOut;
    }
}
 
//Public
TMP42x_Status TMP42x_init(TMP42x* self, TMP42x_Type type, I2C_HandleTypeDef* hi2c, uint8_t I2C_ADDR, TMP42x_Shutdown shutdown, TMP42x_Range range, TMP42x_ConversionRate conversion_rate, float n_eff1, float n_eff2, float n_eff3){
    
    self->hi2c = hi2c;
    self->I2C_ADDR = I2C_ADDR;
    self->type = type;
    self->shutdown = shutdown;
    self->range = range;
    self->conversion_rate = conversion_rate;
    self->n_eff1 = n_eff1;
    self->n_eff2 = n_eff2;
    self->n_eff3 = n_eff3;
    
    // Config 1
    if(__TMP42x_readByte(self, CONFIG1_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    self->reg8.config1_register.SD = self->shutdown;
    self->reg8.config1_register.TEMP_RANGE = self->range;
    if(__TMP42x_writeByte(self, CONFIG1_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    
    // Config 2
    if(__TMP42x_readByte(self, CONFIG2_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    self->reg8._config2_register.LEN  = 1;
    self->reg8._config2_register.RC   = 1;
    self->reg8._config2_register.REN  = 1;
    if(self->type != TMP421) self->reg8._config2_register.REN2 = 1;
    if(self->type == TMP423) self->reg8._config2_register.REN3 = 1;
    if(__TMP42x_writeByte(self, CONFIG2_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    
    // Conversion Rate
    if(__TMP42x_readByte(self, CONVERSION_RATE_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    self->reg8.conversion_rate_register.RATE = conversion_rate;
    if(__TMP42x_writeByte(self, CONVERSION_RATE_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    
    // eta 1
    if(__TMP42x_readByte(self, nCORRECTION1_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    int8_t n_adjust = (int8_t)(300 - (302.4/self->n_eff1));
    self->reg8.n_correction_register.N = n_adjust;
    if(__TMP42x_writeByte(self, nCORRECTION1_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    
    
    // eta 2
    if(self->type != TMP421){
        if(__TMP42x_readByte(self, nCORRECTION2_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
        n_adjust = (int8_t)(300 - (302.4/self->n_eff2));
        self->reg8.n_correction_register.N = n_adjust;
        if(__TMP42x_writeByte(self, nCORRECTION2_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    }
 
    // eta 3
    if(self->type == TMP423){
        if(__TMP42x_readByte(self, nCORRECTION3_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
        n_adjust = (int8_t)(300 - (302.4/self->n_eff3));
        self->reg8.n_correction_register.N = n_adjust;
        if(__TMP42x_writeByte(self, nCORRECTION3_REGISTER)!=TMP42x_OK) return TMP42x_TimeOut;
    }
        
    return TMP42x_OK;
}

double TMP42x_getRemoteTemp(TMP42x* self, uint8_t channel_number){
    if(channel_number > (self->type + 1)) return -999;
    __TMP42x_readTwoBytes(self, REMOTE1_TEMP_MSB + channel_number - 1);
    return self->reg16.temp_register.TEMP * 0.0625 - self->range * 0x40;
}

int8_t TMP42x_getRemoteTemp_Int(TMP42x* self, uint8_t channel_number){
    if(channel_number > (self->type + 1)) return -128;
    __TMP42x_readByte(self, REMOTE1_TEMP_MSB + channel_number - 1);
    return self->reg8.raw_data - self->range * 0x40;
}

double TMP42x_getLocalTemp(TMP42x* self){
    __TMP42x_readTwoBytes(self, LOCAL_TEMP_MSB);
    return self->reg16.temp_register.TEMP * 0.0625 - self->range * 0x40;
}

int8_t TMP42x_getLocalTemp_Int(TMP42x* self){
    __TMP42x_readByte(self, LOCAL_TEMP_MSB);
    return self->reg8.raw_data - self->range * 0x40;
}

TMP42x_Status TMP42x_oneShotStart(TMP42x* self){
    self->reg8.raw_data = 0x69;
    return __TMP42x_writeByte(self, ONE_SHOT_START_REGISTER);
}

TMP42x_Status TMP42x_softwareReset(TMP42x* self){
    self->reg8.raw_data = 0x85;
    return __TMP42x_writeByte(self, SOFTWARE_RESET_REGISTER);
}

uint8_t TMP42x_getManID(TMP42x* self){
    __TMP42x_readByte(self, MAN_ID_REGISTER);
    return self->reg8.man_id_register.MANUFACTURE_ID;  
}

uint8_t TMP42x_getDevID(TMP42x* self){
    __TMP42x_readByte(self, DEVICE_ID_REGISTER);
    return self->reg8.dev_id_register.DEVID;    
}