1 /* 2 * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha (at) intel.com> 3 * Copyright (c) 2014 Intel Corporation. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining 6 * a copy of this software and associated documentation files (the 7 * "Software"), to deal in the Software without restriction, including 8 * without limitation the rights to use, copy, modify, merge, publish, 9 * distribute, sublicense, and/or sell copies of the Software, and to 10 * permit persons to whom the Software is furnished to do so, subject to 11 * the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be 14 * included in all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 */ 24 25 #include <iostream> 26 #include <unistd.h> 27 #include <stdlib.h> 28 #include <stdexcept> 29 30 #include "maxds3231m.h" 31 32 using namespace upm; 33 34 MAXDS3231M::MAXDS3231M (int bus, int devAddr) : m_i2Ctx(bus) { 35 m_name = "MAXDS3231M"; 36 37 m_i2cAddr = devAddr; 38 m_bus = bus; 39 40 mraa::Result ret = m_i2Ctx.address(m_i2cAddr); 41 if (ret != mraa::SUCCESS) { 42 throw std::invalid_argument(std::string(__FUNCTION__) + 43 ": m_i2Ctx.address() failed"); 44 } 45 } 46 47 void 48 MAXDS3231M::setDate (Time3231 &time) { 49 uint8_t *data = (uint8_t *)&time; 50 51 i2cWriteReg_N (TIME_CAL_ADDR, 7, data); 52 } 53 54 bool 55 MAXDS3231M::getDate (Time3231 &time) { 56 uint8_t buffer[7]; 57 58 // We need 7 bytes of data. 59 if (i2cReadReg_N (TIME_CAL_ADDR, 7, buffer) > 6) { 60 uint8_t century = (buffer[5] & 0x80) >> 7; 61 62 time.second = BCDtoDEC(buffer[0]); 63 time.minute = BCDtoDEC(buffer[1]); 64 time.hour = BCDtoDEC(buffer[2]); 65 time.day = BCDtoDEC(buffer[4]); 66 time.month = BCDtoDEC(buffer[5] & 0x1F); 67 time.year = (century == 1) ? 2000 + BCDtoDEC(buffer[6]) : 1900 + BCDtoDEC(buffer[6]); 68 time.weekDay = BCDtoDEC(buffer[3]); 69 70 return true; 71 } 72 73 return false; 74 } 75 76 uint16_t 77 MAXDS3231M::getTemperature () { 78 uint8_t buffer[2]; 79 uint8_t msb = 0; 80 uint8_t lsb = 0; 81 82 i2cReadReg_N (TEMPERATURE_ADDR, 2, buffer); 83 msb = buffer[0]; 84 lsb = buffer[1] >> 6; 85 86 if ((msb & 0x80) != 0) 87 msb |= ~((1 << 8) - 1); // if negative get two's complement 88 89 return 0.25 * lsb + msb; 90 } 91 92 /* 93 * ************** 94 * private area 95 * ************** 96 */ 97 uint16_t 98 MAXDS3231M::i2cReadReg_N (int reg, unsigned int len, uint8_t * buffer) { 99 int readByte = 0; 100 101 m_i2Ctx.address(m_i2cAddr); 102 m_i2Ctx.writeByte(reg); 103 104 m_i2Ctx.address(m_i2cAddr); 105 readByte = m_i2Ctx.read(buffer, len); 106 return readByte; 107 } 108 109 mraa::Result 110 MAXDS3231M::i2cWriteReg_N (uint8_t reg, unsigned int len, uint8_t * buffer) { 111 mraa::Result error = mraa::SUCCESS; 112 113 error = m_i2Ctx.address (m_i2cAddr); 114 error = m_i2Ctx.write (buffer, len); 115 116 return error; 117 } 118 119 uint8_t 120 MAXDS3231M::DECtoBSD(uint8_t data) { 121 return ((data / 10 * 16) + (data % 10)); 122 } 123 124 uint8_t 125 MAXDS3231M::BCDtoDEC(uint8_t data) { 126 return ((data / 16 * 10) + (data % 16)); 127 } 128
