maxds3231m: Added new sensor support get/set data&time and get temperature (NOT TESTED YET)

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

src/maxds3231m/maxds3231m.cxx

@@ -0,0 +1,141 @@
+/*
+ * 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 "maxds3231m.h"
+
+using namespace upm;
+
+struct DS3231Exception : public std::exception {
+    std::string message;
+    DS3231Exception (std::string msg) : message (msg) { }
+    ~DS3231Exception () throw () { }
+    const char* what() const throw () { return message.c_str(); }
+};
+
+MAXDS3231M::MAXDS3231M (int bus, int devAddr) {
+    m_name = "MAXDS3231M";
+
+    m_i2cAddr = devAddr;
+    m_bus = bus;
+
+    m_i2Ctx = mraa_i2c_init(m_bus);
+
+    mraa_result_t ret = mraa_i2c_address(m_i2Ctx, m_i2cAddr);
+    if (ret != MRAA_SUCCESS) {
+        throw DS3231Exception ("Couldn't initilize I2C.");
+    }
+}
+
+MAXDS3231M::~MAXDS3231M() {
+    mraa_i2c_stop(m_i2Ctx);
+}
+
+void
+MAXDS3231M::setDate (Time3231 &time) {
+    uint8_t *data = (uint8_t *)&time;
+
+    i2cWriteReg_N (TIME_CAL_ADDR, 7, data);
+}
+
+bool
+MAXDS3231M::getDate (Time3231 &time) {
+    uint8_t buffer[7];
+
+    // We need 7 bytes of data.
+    if (i2cReadReg_N (TIME_CAL_ADDR, 7, buffer) > 6) {
+        uint8_t century = (buffer[5] & 0x80) >> 7;
+
+        time.second     = BCDtoDEC(buffer[0]);
+        time.minute     = BCDtoDEC(buffer[1]);
+        time.hour       = BCDtoDEC(buffer[2]);
+        time.day        = BCDtoDEC(buffer[4]);
+        time.month      = BCDtoDEC(buffer[5] & 0x1F);
+        time.year       = (century == 1) ? 2000 + BCDtoDEC(buffer[6]) : 1900 + BCDtoDEC(buffer[6]);
+        time.weekDay    = BCDtoDEC(buffer[3]);
+
+        return true;
+    }
+
+    return false;
+}
+
+uint16_t
+MAXDS3231M::getTemperature () {
+    uint8_t buffer[2];
+    uint16_t tempRaw = 0;
+
+    i2cReadReg_N (TEMPERATURE_ADDR, 2, buffer);
+    tempRaw = (((int16_t)buffer[0]) << 8) | buffer[1];
+
+    return tempRaw;
+}
+
+/*
+ * **************
+ *  private area
+ * **************
+ */
+uint16_t
+MAXDS3231M::i2cReadReg_N (int reg, unsigned int len, uint8_t * buffer) {
+    int readByte = 0;
+
+    if (m_i2Ctx == NULL) {
+        throw DS3231Exception ("Couldn't find initilized I2C.");
+    }
+
+    mraa_i2c_address(m_i2Ctx, m_i2cAddr);
+    mraa_i2c_write_byte(m_i2Ctx, reg);
+
+    mraa_i2c_address(m_i2Ctx, m_i2cAddr);
+    readByte = mraa_i2c_read(m_i2Ctx, buffer, len);
+    return readByte;
+}
+
+mraa_result_t
+MAXDS3231M::i2cWriteReg_N (uint8_t reg, unsigned int len, uint8_t * buffer) {
+    mraa_result_t error = MRAA_SUCCESS;
+
+    if (m_i2Ctx == NULL) {
+        throw DS3231Exception ("Couldn't find initilized I2C.");
+    }
+
+    error = mraa_i2c_address (m_i2Ctx, m_i2cAddr);
+    error = mraa_i2c_write (m_i2Ctx, buffer, len);
+
+    return error;
+}
+
+uint8_t
+MAXDS3231M::DECtoBSD(uint8_t data) {
+    return ((data / 10 * 16) + (data % 10));
+}
+
+uint8_t
+MAXDS3231M::BCDtoDEC(uint8_t data) {
+    return ((data / 16 * 10) + (data % 16));
+}