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max31723: made it work with SPI but the data looks like incorrect

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Signed-off-by: Kiveisha Yevgeniy <yevgeniy.kiveisha@intel.com>
This commit is contained in:
Kiveisha Yevgeniy 2014-08-06 16:41:40 +00:00
parent 1747fbbe19
commit d0e83d7076
3 changed files with 52 additions and 23 deletions
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7
examples/max31723.cxx
View File

@ -45,11 +45,12 @@ main(int argc, char **argv)
{
//! [Interesting]
sensor = new upm::MAX31723(7);
usleep (1000000);
// while (!doWork) {
while (!doWork) {
std::cout << "Temperature " << sensor->getTemperature() << std::endl;
// usleep (3000000);
// }
usleep (1000000);
}
//! [Interesting]
std::cout << "exiting application" << std::endl;

61
src/max31723/max31723.cxx
View File

@ -51,12 +51,17 @@ MAX31723::MAX31723 (int csn) {
throw MAX31723Exception ("GPIO failed to initilize");
}
CSOff ();
m_spi = mraa_spi_init (0);
if (m_spi == NULL) {
throw MAX31723Exception ("SPI failed to initilize");
}
CSOff ();
// set spi mode to mode2 (CPOL = 1, CPHA = 0)
mraa_spi_mode (m_spi, MODE2);
// set ontinuously perform temperature conversions
writeRegister (R_STS_WRITE_CMD, B_CONT_READING);
}
MAX31723::~MAX31723() {
@ -72,31 +77,24 @@ MAX31723::~MAX31723() {
}
}
uint16_t
short
MAX31723::getTemperature () {
uint8_t lsb = 0;
uint8_t msb = 0;
uint8_t buf[2] = { 0x01, 0x00};
short temperature = 0;
CSOn ();
lsb = readRegister (R_TEMPERATURE_LSB);
msb = readRegister (R_TEMPERATURE_MSB);
uint8_t* x = mraa_spi_write_buf(m_spi, buf, 2);
if ((msb & 0x80) != 0) {
msb &= 0x7F;
temperature = 0 - msb;
printf ("%d\n", (uint16_t)*x);
} else {
temperature = msb;
}
/*mraa_spi_write (m_spi, R_TEMPERATURE_LSB);
lsb = mraa_spi_write (m_spi, lsb);
lsb >>= 4;*/
/*mraa_spi_write (m_spi, R_TEMPERATURE_MSB);
msb = mraa_spi_write (m_spi, msb);
if ((msb & 0x80) != 0)
msb |= ~((1 << 8) - 1);*/
CSOff ();
return msb;
return temperature;
}
/*
@ -105,6 +103,31 @@ MAX31723::getTemperature () {
* **************
*/
uint8_t
MAX31723::readRegister (uint8_t reg) {
uint8_t data[2] = { 0x00, 0x00 };
uint8_t* sensorData = NULL;
CSOn ();
data[0] = reg;
sensorData = mraa_spi_write_buf(m_spi, data, 2);
CSOff ();
return sensorData[1];
}
void
MAX31723::writeRegister (uint8_t reg, uint8_t data) {
uint8_t buffer[2] = { 0x00, 0x00 };
uint8_t* sensorData = NULL;
CSOn ();
buffer[0] = reg;
buffer[1] = data;
sensorData = mraa_spi_write_buf(m_spi, buffer, 2);
CSOff ();
}
mraa_result_t
MAX31723::CSOn () {
return mraa_gpio_write (m_csnPinCtx, HIGH);

7
src/max31723/max31723.h
View File

@ -46,6 +46,8 @@ class MAX31723 {
static const uint8_t R_TEMPERATURE_LSB = 0x01;
static const uint8_t R_TEMPERATURE_MSB = 0x02;
static const uint8_t B_CONT_READING = 0x00;
/**
* Instanciates a MAX31723 object
*
@ -62,7 +64,7 @@ class MAX31723 {
/**
* Get on board temperature.
*/
uint16_t getTemperature ();
short getTemperature ();
/**
* Return name of the component
@ -76,6 +78,9 @@ class MAX31723 {
mraa_spi_context m_spi;
mraa_gpio_context m_csnPinCtx;
uint8_t readRegister (uint8_t reg);
void writeRegister (uint8_t reg, uint8_t data);
/**
* Set chip select pin LOW
*/