| /* |
| * 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)); |
| } |