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mlx90614: patched i2c reads from temperature registers

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Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Mihai Tudor Panu 2016-10-06 17:25:56 -07:00
parent 94de822499
commit 255d6139ee
2 changed files with 13 additions and 42 deletions
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45
src/mlx90614/mlx90614.cxx
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@ -51,8 +51,8 @@ MLX90614::MLX90614 (int bus, int devAddr) : m_i2Ctx(bus) {
} }
float float
MLX90614::readObjectTempF(void) { MLX90614::readObjectTempF(int objAddr) {
return (readTemperature(MLX90614_TOBJ1) * 9 / 5) + 32; return (readTemperature(objAddr) * 9 / 5) + 32;
} }
float float
@ -61,8 +61,8 @@ MLX90614::readAmbientTempF(void) {
} }
float float
MLX90614::readObjectTempC(void) { MLX90614::readObjectTempC(int objAddr) {
return readTemperature(MLX90614_TOBJ1); return readTemperature(objAddr);
} }
float float
@ -75,42 +75,7 @@ MLX90614::readAmbientTempC(void) {
* private area * private area
* ************** * **************
*/ */
uint16_t
MLX90614::i2cReadReg_N (int reg, unsigned int len, uint8_t * buffer) {
int readByte = 0;
m_i2Ctx.address(m_i2cAddr);
m_i2Ctx.writeByte(reg);
readByte = m_i2Ctx.read(buffer, len);
return readByte;
}
mraa::Result
MLX90614::i2cWriteReg_N (uint8_t reg, unsigned int len, uint8_t * buffer) {
mraa::Result error = mraa::SUCCESS;
error = m_i2Ctx.address(m_i2cAddr);
error = m_i2Ctx.write(buffer, len);
return error;
}
float float
MLX90614::readTemperature (uint8_t address) { MLX90614::readTemperature (uint8_t address) {
uint8_t buffer[3]; return m_i2Ctx.readWordReg(address) * 0.02 - 273.15;
float temperature = 0;
/* Reading temperature from sensor.
Answer contained of 3 bytes (TEMP_LSB | TEMP_MSB | PEC)
*/
if (i2cReadReg_N(address, 3, buffer) > 2) {
temperature = buffer[0];
temperature = buffer[1] << 8;
temperature *= .02;
temperature -= 273.15;
}
return temperature;
} }

10
src/mlx90614/mlx90614.hpp
View File

@ -85,8 +85,11 @@ class MLX90614 {
/** /**
* Reads the object temperature in Fahrenheit * Reads the object temperature in Fahrenheit
*
* @param objAddr Object register for models with dual sensors
* Can be MLX90614_TOBJ1 (default) or MLX90614_TOBJ2
*/ */
float readObjectTempF(void); float readObjectTempF(int objAddr=MLX90614_TOBJ1);
/** /**
* Reads the ambient temperature in Fahrenheit * Reads the ambient temperature in Fahrenheit
@ -94,8 +97,11 @@ class MLX90614 {
float readAmbientTempF(void); float readAmbientTempF(void);
/** /**
* Reads the object temperature in Celsius * Reads the object temperature in Celsius
*
* @param objAddr Object register for models with dual sensors
* Can be MLX90614_TOBJ1 (default) or MLX90614_TOBJ2
*/ */
float readObjectTempC(void); float readObjectTempC(int objAddr=MLX90614_TOBJ1);
/** /**
* Reads the ambient temperature in Celsius * Reads the ambient temperature in Celsius