M41T62 is a serial real-time clock (RTC) made by STMicroelectronics.
Dependents: LPC1114_data_logger Check_external_RTC LPC1114_barometer_with_data_logging
m41t62_rtc.cpp
- Committer:
- kenjiArai
- Date:
- 2014-06-21
- Revision:
- 0:2919f8bd90f3
- Child:
- 1:9d7702a887d3
File content as of revision 0:2919f8bd90f3:
/* * mbed library program * Control M41T62 RTC Module * * Copyright (c) 2014 Kenji Arai / JH1PJL * http://www.page.sannet.ne.jp/kenjia/index.html * http://mbed.org/users/kenjiArai/ * Created: June 21st, 2014 * Revised: June 21st, 2014 * * 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. */ /* *---------------- REFERENCE ---------------------------------------------------------------------- * http://www.st-japan.co.jp/web/jp/catalog/sense_power/FM151/CL1410/SC403/PF82507 */ #include "mbed.h" #include "m41t62_rtc.h" // Register definition #define M41T62_REG_SSEC 0 #define M41T62_REG_SEC 1 #define M41T62_REG_MIN 2 #define M41T62_REG_HOUR 3 #define M41T62_REG_WDAY 4 #define M41T62_REG_DAY 5 #define M41T62_REG_MON 6 #define M41T62_REG_YEAR 7 #define M41T62_REG_ALARM_MON 0xa #define M41T62_REG_ALARM_DAY 0xb #define M41T62_REG_ALARM_HOUR 0xc #define M41T62_REG_ALARM_MIN 0xd #define M41T62_REG_ALARM_SEC 0xe #define M41T62_REG_FLAGS 0xf M41T62::M41T62 (PinName p_sda, PinName p_scl) : i2c(p_sda, p_scl) { M41T62_addr = M41T62ADDR; } M41T62::M41T62 (I2C& p_i2c) : i2c(p_i2c) { M41T62_addr = M41T62ADDR; } void M41T62::read_rtc (rtc_time *tm) { uint8_t eep_dt; eep_dt = M41T62_REG_SSEC; i2c_write_n_bytes((int)M41T62_addr, (char *)eep_dt, 1); i2c_read_n_bytes((int)M41T62_addr, (char *)rtc_buf, 8); tm->rtc_seconds = bcd2bin(rtc_buf[M41T62_REG_SEC] & 0x7f); tm->rtc_minutes = bcd2bin(rtc_buf[M41T62_REG_MIN] & 0x7f); tm->rtc_hours = bcd2bin(rtc_buf[M41T62_REG_HOUR] & 0x3f); tm->rtc_date = bcd2bin(rtc_buf[M41T62_REG_DAY] & 0x3f); tm->rtc_weekday = rtc_buf[M41T62_REG_WDAY] & 0x07; tm->rtc_month = bcd2bin(rtc_buf[M41T62_REG_MON] & 0x1f); tm->rtc_year = bcd2bin(rtc_buf[M41T62_REG_YEAR]) + 100 + 1900; } void M41T62::write_rtc (rtc_time *tm) { uint8_t eep_dt; eep_dt = M41T62_REG_SSEC; i2c_write_n_bytes((int)M41T62_addr, (char *)eep_dt, 1); i2c_read_n_bytes((int)M41T62_addr, (char *)rtc_buf, 8); rtc_buf[0] = M41T62_REG_SSEC; rtc_buf[M41T62_REG_SSEC + 1] = 0; rtc_buf[M41T62_REG_YEAR + 1] = bin2bcd((uint8_t)(tm->rtc_year % 100)); rtc_buf[M41T62_REG_MON + 1] = bin2bcd(tm->rtc_month) | (rtc_buf[M41T62_REG_MON] & ~0x1f); rtc_buf[M41T62_REG_DAY + 1] = bin2bcd(tm->rtc_date) | (rtc_buf[M41T62_REG_DAY] & ~0x3f); rtc_buf[M41T62_REG_WDAY + 1] = (tm->rtc_weekday & 0x07) | (rtc_buf[M41T62_REG_WDAY] & ~0x07); rtc_buf[M41T62_REG_HOUR + 1] = bin2bcd(tm->rtc_hours) | (rtc_buf[M41T62_REG_HOUR] & ~0x3f); rtc_buf[M41T62_REG_MIN + 1] = bin2bcd(tm->rtc_minutes) | (rtc_buf[M41T62_REG_MIN] & ~0x7f); rtc_buf[M41T62_REG_SEC + 1] = bin2bcd(tm->rtc_seconds) | (rtc_buf[M41T62_REG_SEC] & ~0x7f); i2c_write_n_bytes((int)M41T62_addr, (char *)rtc_buf, 9); } void M41T62::set_sq_wave (uint8_t sqw_dt) { uint8_t eep_dt[2]; eep_dt[0] = M41T62_REG_WDAY; i2c_write_n_bytes((int)M41T62_addr, (char *)eep_dt, 1); i2c_read_n_bytes((int)M41T62_addr, (char *)eep_dt, 1); eep_dt[1] = (eep_dt[0] & 0x07) | (sqw_dt << 4); eep_dt[0] = M41T62_REG_WDAY; i2c_write_n_bytes((int)M41T62_addr, (char *)rtc_buf, 2); } void M41T62::i2c_read_n_bytes (int addr, char *dt, int n) { i2c.read(addr, dt, n); } void M41T62::i2c_write_n_bytes (int addr, char *dt, int n) { i2c.write(addr, dt, n); } uint8_t M41T62::bin2bcd (uint8_t dt){ uint8_t bcdhigh = 0; while (dt >= 10) { bcdhigh++; dt -= 10; } return ((uint8_t)(bcdhigh << 4) | dt); } uint8_t M41T62::bcd2bin (uint8_t dt){ uint8_t tmp = 0; tmp = ((uint8_t)(dt & (uint8_t)0xf0) >> (uint8_t)0x4) * 10; return (tmp + (dt & (uint8_t)0x0f)); }