/* * Copyright (C) 2017 Freie Universität Berlin * * This file is subject to the terms and conditions of the GNU Lesser * General Public License v2.1. See the file LICENSE in the top level * directory for more details. */ /** * @ingroup drivers_ds1307 * @{ * * @file * @author Martine Lenders */ #include #include "bcd.h" #include "ds1307.h" #include "ds1307_internal.h" #define ENABLE_DEBUG (0) #include "debug.h" static int _nvram_read(struct nvram *dev, uint8_t *dst, uint32_t src, size_t size); static int _nvram_write(struct nvram *dev, const uint8_t *src, uint32_t dst, size_t size); static uint8_t _convert_12_to_24(uint8_t hour) { if (hour & DS1307_REG_HOUR_12H) { uint8_t tmp = bcd_to_byte(hour & DS1307_REG_HOUR_12H_MASK); if (hour & DS1307_REG_HOUR_PM) { if (tmp < 12) { tmp += 12; } } else { if (tmp == 12) { tmp = 0; } } hour = (bcd_from_byte(tmp) & DS1307_REG_HOUR_24H_MASK); } return hour; } int ds1307_init(ds1307_t *dev, const ds1307_params_t *params) { int res; uint8_t hour; dev->i2c = params->i2c; i2c_acquire(dev->i2c); res = i2c_init_master(dev->i2c, params->clk); if (res < 0) { i2c_release(dev->i2c); DEBUG("ds1307: Error initializing I2C: %i\n", res); return -1; } /* normalize hour format */ res = i2c_read_reg(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_HOUR, &hour); if (res < 0) { i2c_release(dev->i2c); DEBUG("ds1307: Error reading HOUR register on init: %i\n", res); return -1; } res = i2c_write_reg(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_HOUR, _convert_12_to_24(hour)); i2c_release(dev->i2c); if (res < 0) { DEBUG("ds1307: Error writing HOUR register on init: %i\n", res); return -1; } dev->nvram.read = _nvram_read; dev->nvram.write = _nvram_write; dev->nvram.size = (DS1307_REG_RAM_LAST - DS1307_REG_RAM_FIRST) + 1; dev->nvram.extra = dev; return 0; } int ds1307_set_time(const ds1307_t *dev, const struct tm *time) { uint8_t regs[DS1307_REG_YEAR - DS1307_REG_SEC + 1]; int res; regs[DS1307_REG_SEC] = (bcd_from_byte(time->tm_sec) & DS1307_REG_SEC_MASK); regs[DS1307_REG_MIN] = (bcd_from_byte(time->tm_min) & DS1307_REG_MIN_MASK); regs[DS1307_REG_HOUR] = (bcd_from_byte(time->tm_hour) & DS1307_REG_HOUR_24H_MASK); regs[DS1307_REG_DOW] = (bcd_from_byte(time->tm_wday + DS1307_DOW_OFFSET) & DS1307_REG_DOW_MASK); regs[DS1307_REG_DOM] = (bcd_from_byte(time->tm_mday) & DS1307_REG_DOM_MASK); regs[DS1307_REG_MON] = (bcd_from_byte(time->tm_mon + DS1307_MON_OFFSET) & DS1307_REG_MON_MASK); regs[DS1307_REG_YEAR] = bcd_from_byte(time->tm_year + DS1307_YEAR_OFFSET); i2c_acquire(dev->i2c); res = i2c_write_regs(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_SEC, regs, sizeof(regs)); DEBUG("ds1307: wrote bytes %02x %02x %02x %02x %02x %02x %02x to device (result: %i)\n", regs[DS1307_REG_SEC], regs[DS1307_REG_MIN], regs[DS1307_REG_HOUR], regs[DS1307_REG_DOW], regs[DS1307_REG_DOM], regs[DS1307_REG_MON], regs[DS1307_REG_YEAR], res); i2c_release(dev->i2c); return (res < 0) ? -1 : 0; } int ds1307_get_time(const ds1307_t *dev, struct tm *time) { uint8_t regs[DS1307_REG_YEAR - DS1307_REG_SEC + 1]; int res; i2c_acquire(dev->i2c); res = i2c_read_regs(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_SEC, regs, sizeof(regs)); DEBUG("ds1307: read bytes %02x %02x %02x %02x %02x %02x %02x from device (result: %i)\n", regs[DS1307_REG_SEC], regs[DS1307_REG_MIN], regs[DS1307_REG_HOUR], regs[DS1307_REG_DOW], regs[DS1307_REG_DOM], regs[DS1307_REG_MON], regs[DS1307_REG_YEAR], res); i2c_release(dev->i2c); if (res < 0) { return -1; } time->tm_sec = bcd_to_byte(regs[DS1307_REG_SEC] & DS1307_REG_SEC_MASK); time->tm_min = bcd_to_byte(regs[DS1307_REG_MIN] & DS1307_REG_MIN_MASK); time->tm_hour = bcd_to_byte(regs[DS1307_REG_HOUR] & DS1307_REG_HOUR_24H_MASK); time->tm_wday = (bcd_to_byte(regs[DS1307_REG_DOW] & DS1307_REG_DOW_MASK) - DS1307_DOW_OFFSET); time->tm_mday = bcd_to_byte(regs[DS1307_REG_DOM] & DS1307_REG_DOM_MASK); time->tm_mon = bcd_to_byte(regs[DS1307_REG_MON] & DS1307_REG_MON_MASK) - DS1307_MON_OFFSET; time->tm_year = (bcd_to_byte(regs[DS1307_REG_YEAR]) - DS1307_YEAR_OFFSET); return 0; } int ds1307_halt(const ds1307_t *dev) { int res; uint8_t sec; i2c_acquire(dev->i2c); res = i2c_read_reg(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_SEC, &sec); if (res < 0) { i2c_release(dev->i2c); DEBUG("ds1307: Error reading SEC register on halt: %i\n", res); return -1; } sec |= DS1307_REG_SEC_CH; res = i2c_write_reg(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_SEC, sec); i2c_release(dev->i2c); return (res < 0) ? -1 : 0; } int ds1307_set_sqw_mode(const ds1307_t *dev, ds1307_sqw_mode_t mode) { int res; i2c_acquire(dev->i2c); res = i2c_write_reg(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_SQW_CTL, (uint8_t)mode); i2c_release(dev->i2c); return res; } int ds1307_get_sqw_mode(const ds1307_t *dev) { uint8_t mode; int res; i2c_acquire(dev->i2c); res = i2c_read_reg(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_SQW_CTL, &mode); i2c_release(dev->i2c); return (res < 0) ? res : (int)mode; } static int _nvram_read(struct nvram *nvram, uint8_t *dst, uint32_t src, size_t size) { const ds1307_t *dev = nvram->extra; int res; if ((src + size) > nvram->size) { return -3; } i2c_acquire(dev->i2c); res = i2c_read_regs(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_RAM_FIRST + src, dst, size); i2c_release(dev->i2c); return res; } static int _nvram_write(struct nvram *nvram, const uint8_t *src, uint32_t dst, size_t size) { const ds1307_t *dev = nvram->extra; int res; if ((dst + size) > nvram->size) { return -3; } i2c_acquire(dev->i2c); res = i2c_write_regs(dev->i2c, DS1307_I2C_ADDRESS, DS1307_REG_RAM_FIRST + dst, src, size); i2c_release(dev->i2c); return res; } /** @} */