c878283c44
Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
/*
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* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <iostream>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdexcept>
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#include "max31723.h"
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using namespace upm;
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MAX31723::MAX31723 (int csn) {
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mraa_result_t error = MRAA_SUCCESS;
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m_name = "MAX31723";
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m_csnPinCtx = mraa_gpio_init (csn);
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if (m_csnPinCtx == NULL) {
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": mraa_gpio_init() failed");
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}
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error = mraa_gpio_dir (m_csnPinCtx, MRAA_GPIO_OUT);
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if (error != MRAA_SUCCESS) {
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": mraa_gpio_dir() failed");
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}
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CSOff ();
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m_spi = mraa_spi_init (0);
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if (m_spi == NULL) {
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": mraa_spi_init() failed");
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}
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// set spi mode to mode2 (CPOL = 1, CPHA = 0)
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mraa_spi_mode (m_spi, MRAA_SPI_MODE2);
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// set ontinuously perform temperature conversions
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writeRegister (R_STS_WRITE_CMD, B_CONT_READING);
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}
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MAX31723::~MAX31723() {
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mraa_result_t error = MRAA_SUCCESS;
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error = mraa_spi_stop(m_spi);
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if (error != MRAA_SUCCESS) {
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mraa_result_print(error);
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}
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error = mraa_gpio_close (m_csnPinCtx);
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if (error != MRAA_SUCCESS) {
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mraa_result_print(error);
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}
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}
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short
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MAX31723::getTemperature () {
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uint8_t lsb = 0;
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uint8_t msb = 0;
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short temperature = 0;
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lsb = readRegister (R_TEMPERATURE_LSB);
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msb = readRegister (R_TEMPERATURE_MSB);
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if ((msb & 0x80) != 0) {
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msb &= 0x7F;
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temperature = 0 - msb;
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} else {
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temperature = msb;
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}
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return temperature;
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}
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/*
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* **************
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* private area
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* **************
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*/
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uint8_t
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MAX31723::readRegister (uint8_t reg) {
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uint8_t data[2] = { 0x00, 0x00 };
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uint8_t* sensorData = NULL;
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CSOn ();
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data[0] = reg;
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sensorData = mraa_spi_write_buf(m_spi, data, 2);
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CSOff ();
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return sensorData[1];
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}
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void
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MAX31723::writeRegister (uint8_t reg, uint8_t data) {
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uint8_t buffer[2] = { 0x00, 0x00 };
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uint8_t* sensorData = NULL;
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CSOn ();
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buffer[0] = reg;
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buffer[1] = data;
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sensorData = mraa_spi_write_buf(m_spi, buffer, 2);
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CSOff ();
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}
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mraa_result_t
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MAX31723::CSOn () {
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return mraa_gpio_write (m_csnPinCtx, HIGH);
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}
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mraa_result_t
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MAX31723::CSOff () {
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return mraa_gpio_write (m_csnPinCtx, LOW);
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}
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