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PCF85063A.cpp
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PCF85063A.cpp
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/*
* The MIT License (MIT)
*
* Copyright (c) 2018 Jaakko Salo ([email protected] / jaakkos on Freenode)
*
* 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 "PCF85063A.h"
#define REG_CTRL1_ADDR 0x00
#define REG_CTRL2_ADDR 0x01
#define REG_TIME_DATE_ADDR 0x04
#define REG_ALARM_ADDR 0x0B
#define REG_OFFSET_ADDR 0x02
#define REG_COUNTDOWN_TIMER_VALUE_ADDR 0x10
#define REG_COUNTDOWN_TIMER_MODE_ADDR 0x11
#define I2C_ADDR 0x51
static bool i2c_read(uint8_t reg, uint8_t bytes, uint8_t *in)
{
uint8_t nread = 0;
int ibyte;
Wire.beginTransmission(I2C_ADDR);
size_t wret = Wire.write(reg);
if (Wire.endTransmission() != 0 ||
wret != 1)
{
return false;
}
Wire.requestFrom((uint8_t)I2C_ADDR, bytes);
while (Wire.available() &&
((ibyte = Wire.read()) != -1) &&
nread < bytes)
{
in[nread] = ibyte;
nread++;
}
return nread == bytes;
}
static bool i2c_write(uint8_t reg, uint8_t bytes, uint8_t *out)
{
Wire.beginTransmission(I2C_ADDR);
size_t wret = Wire.write(reg);
wret += Wire.write(out, bytes);
if (Wire.endTransmission() != 0 ||
wret != (bytes+1))
{
return false;
}
return true;
}
uint8_t
PCF85063A::bcd_decode(uint8_t bcd)
{
return (bcd >> 4) * 10 + (bcd & 0x0F);
}
uint8_t
PCF85063A::bcd_encode(uint8_t dec)
{
return ((dec / 10) << 4) | (dec % 10);
}
PCF85063A::PCF85063A()
{
Wire.begin();
}
bool
PCF85063A::time_get(tmElements_t *now)
{
uint8_t buf[7];
if (!i2c_read(REG_TIME_DATE_ADDR, sizeof(buf), buf))
return false;
now->Second = bcd_decode(buf[0] & ~0x80);
now->Minute = bcd_decode(buf[1] & ~0x80);
now->Hour = bcd_decode(buf[2] & ~0xC0); /* 24h clock */
now->Day = bcd_decode(buf[3] & ~0xC0);
now->Wday = bcd_decode(buf[4] & ~0xF8);
now->Month = bcd_decode(buf[5] & ~0xE0);
now->Year = bcd_decode(buf[6]);
return !(buf[0] & 0x80);
}
bool
PCF85063A::time_set(tmElements_t *new_time)
{
uint8_t buf[7];
buf[0] = bcd_encode(new_time->Second);
buf[1] = bcd_encode(new_time->Minute);
buf[2] = bcd_encode(new_time->Hour);
buf[3] = bcd_encode(new_time->Day);
buf[4] = bcd_encode(new_time->Wday);
buf[5] = bcd_encode(new_time->Month);
buf[6] = bcd_encode(new_time->Year);
return i2c_write(REG_TIME_DATE_ADDR, sizeof(buf), buf);
}
bool
PCF85063A::reset()
{
uint8_t buf = 0x58;
return i2c_write(REG_CTRL1_ADDR, 1, &buf);
}
bool
PCF85063A::stop(bool stopped)
{
PCF85063A_Regs regs;
if (!this->ctrl_get(®s))
return false;
if (stopped) PCF85063A_REG_SET(regs, PCF85063A_REG_STOP);
else PCF85063A_REG_CLEAR(regs, PCF85063A_REG_STOP);
return this->ctrl_set(regs, true);
}
bool
PCF85063A::clkout_freq_set(uint16_t freq)
{
uint8_t COF;
PCF85063A_Regs regs;
switch (freq)
{
case 0: COF = 7; break;
case 1: COF = 6; break;
case 1024: COF = 5; break;
case 2048: COF = 4; break;
case 4096: COF = 3; break;
case 8192: COF = 2; break;
case 16384: COF = 1; break;
case 32768: COF = 0; break;
default: return false;
}
if (!this->ctrl_get(®s))
return false;
PCF85063A_REG_CLEAR(regs, PCF85063A_REG_COF);
regs |= ((uint16_t)COF) << 8;
return this->ctrl_set(regs, true);
}
bool
PCF85063A::countdown_set(bool enable,
CountdownSrcClock source_clock,
uint8_t value,
bool int_enable,
bool int_pulse)
{
uint8_t timer_reg[2] = {0};
if (source_clock < 0 || source_clock > 3)
return false;
/* First disable the countdown timer */
if (!i2c_write(REG_COUNTDOWN_TIMER_MODE_ADDR, 1, timer_reg+1))
return false;
/* Reconfigure timer */
if (enable) timer_reg[1] |= PCF85063A_REG_TE;
if (int_enable) timer_reg[1] |= PCF85063A_REG_TIE;
if (int_pulse) timer_reg[1] |= PCF85063A_REG_TI_TP;
timer_reg[1] |= source_clock << 3;
timer_reg[0] = value;
return i2c_write(REG_COUNTDOWN_TIMER_VALUE_ADDR, 2, timer_reg);
}
bool
PCF85063A::countdown_get(uint8_t *value)
{
return i2c_read(REG_COUNTDOWN_TIMER_VALUE_ADDR, 1, value);
}
bool
PCF85063A::alarm_set(int second, int minute, int hour, int day,
int weekday)
{
uint8_t buf[5];
if ((second < 0 || second > 59) && second != -1) return false;
if ((minute < 0 || minute > 59) && minute != -1) return false;
if ((hour < 0 || hour > 23) && hour != -1) return false;
if ((day < 0 || day > 31) && day != -1) return false;
if ((weekday < 0 || weekday > 6) && weekday != -1) return false;
buf[0] = second < 0 ? 0x80 : bcd_encode(second);
buf[1] = minute < 0 ? 0x80 : bcd_encode(minute);
buf[2] = hour < 0 ? 0x80 : bcd_encode(hour);
buf[3] = day < 0 ? 0x80 : bcd_encode(day);
buf[4] = weekday < 0 ? 0x80 : bcd_encode(weekday);
return i2c_write(REG_ALARM_ADDR, sizeof(buf), buf);
}
bool
PCF85063A::ctrl_get(PCF85063A_Regs *regs)
{
uint8_t buf[2];
if (!i2c_read(REG_CTRL1_ADDR, sizeof(buf), buf))
return false;
*regs = buf[0];
*regs |= ((uint16_t)buf[1]) << 8;
return true;
}
bool
PCF85063A::ctrl_set(PCF85063A_Regs regs, bool mask_alarms)
{
uint8_t buf[2];
int wrsz;
if (mask_alarms)
regs &= ~(PCF85063A_REG_AF | PCF85063A_REG_TF);
buf[0] = regs & 0xFF;
buf[1] = regs >> 8;
return i2c_write(REG_CTRL1_ADDR, sizeof(buf), buf);
}