max31723 :: added new temperature sensor (HAVE ISSUES WITH SPI)

Signed-off-by: Kiveisha Yevgeniy <yevgeniy.kiveisha@intel.com>

src/max31723/max31723.cxx

@@ -0,0 +1,116 @@
+/*
+ * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
+ * Copyright (c) 2014 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <iostream>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "max31723.h"
+
+using namespace upm;
+
+struct MAX31723Exception : public std::exception {
+    std::string message;
+    MAX31723Exception (std::string msg) : message (msg) { }
+    ~MAX31723Exception () throw () { }
+    const char* what() const throw () { return message.c_str(); }
+};
+
+MAX31723::MAX31723 (int csn) {
+    mraa_result_t error = MRAA_SUCCESS;
+    m_name = "MAX31723";
+
+    m_csnPinCtx = mraa_gpio_init (csn);
+    if (m_csnPinCtx == NULL) {
+        throw MAX31723Exception ("GPIO failed to initilize");
+    }
+
+    error = mraa_gpio_dir (m_csnPinCtx, MRAA_GPIO_OUT);
+    if (error != MRAA_SUCCESS) {
+        throw MAX31723Exception ("GPIO failed to initilize");
+    }
+
+    m_spi = mraa_spi_init (0);
+    if (m_spi == NULL) {
+        throw MAX31723Exception ("SPI failed to initilize");
+    }
+
+    CSOff ();
+}
+
+MAX31723::~MAX31723() {
+    mraa_result_t error = MRAA_SUCCESS;
+
+    error = mraa_spi_stop(m_spi);
+    if (error != MRAA_SUCCESS) {
+        mraa_result_print(error);
+    }
+    error = mraa_gpio_close (m_csnPinCtx);
+    if (error != MRAA_SUCCESS) {
+        mraa_result_print(error);
+    }
+}
+
+uint16_t
+MAX31723::getTemperature () {
+    uint8_t lsb = 0;
+    uint8_t msb = 0;
+    uint8_t buf[2] = { 0x01, 0x00};
+
+    CSOn ();
+
+    uint8_t* x = mraa_spi_write_buf(m_spi, buf, 2);
+
+    printf ("%d\n", (uint16_t)*x);
+
+    /*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;
+}
+
+/*
+ * **************
+ *  private area
+ * **************
+ */
+
+mraa_result_t
+MAX31723::CSOn () {
+    return mraa_gpio_write (m_csnPinCtx, HIGH);
+}
+
+mraa_result_t
+MAX31723::CSOff () {
+    return mraa_gpio_write (m_csnPinCtx, LOW);
+}