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/*
* 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 <stdexcept>
#include "maxds3231m.h"
using namespace upm;
MAXDS3231M::MAXDS3231M (int bus, int devAddr) : m_i2Ctx(bus) {
m_name = "MAXDS3231M";
m_i2cAddr = devAddr;
m_bus = bus;
mraa::Result ret = m_i2Ctx.address(m_i2cAddr);
if (ret != mraa::SUCCESS) {
throw std::invalid_argument(std::string(__FUNCTION__) +
": m_i2Ctx.address() failed");
}
}
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];
uint8_t msb = 0;
uint8_t lsb = 0;
i2cReadReg_N (TEMPERATURE_ADDR, 2, buffer);
msb = buffer[0];
lsb = buffer[1] >> 6;
if ((msb & 0x80) != 0)
msb |= ~((1 << 8) - 1); // if negative get two's complement
return 0.25 * lsb + msb;
}
/*
* **************
* private area
* **************
*/
uint16_t
MAXDS3231M::i2cReadReg_N (int reg, unsigned int len, uint8_t * buffer) {
int readByte = 0;
m_i2Ctx.address(m_i2cAddr);
m_i2Ctx.writeByte(reg);
m_i2Ctx.address(m_i2cAddr);
readByte = m_i2Ctx.read(buffer, len);
return readByte;
}
mraa::Result
MAXDS3231M::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;
}
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));
}
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