M41T62 is a serial real-time clock (RTC) made by STMicroelectronics.
Dependents: LPC1114_data_logger Check_external_RTC LPC1114_barometer_with_data_logging
Diff: m41t62_rtc.cpp
- Revision:
- 1:9d7702a887d3
- Parent:
- 0:2919f8bd90f3
- Child:
- 3:41c351da2fdf
diff -r 2919f8bd90f3 -r 9d7702a887d3 m41t62_rtc.cpp --- a/m41t62_rtc.cpp Sat Jun 21 04:37:56 2014 +0000 +++ b/m41t62_rtc.cpp Sun Jun 22 01:45:49 2014 +0000 @@ -6,7 +6,7 @@ * http://www.page.sannet.ne.jp/kenjia/index.html * http://mbed.org/users/kenjiArai/ * Created: June 21st, 2014 - * Revised: June 21st, 2014 + * Revised: June 22nd, 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 @@ -17,12 +17,12 @@ /* *---------------- REFERENCE ---------------------------------------------------------------------- * http://www.st-japan.co.jp/web/jp/catalog/sense_power/FM151/CL1410/SC403/PF82507 + * http://strawberry-linux.com/catalog/items?code=12062 */ #include "mbed.h" #include "m41t62_rtc.h" - // Register definition #define M41T62_REG_SSEC 0 #define M41T62_REG_SEC 1 @@ -37,17 +37,52 @@ #define M41T62_REG_ALARM_HOUR 0xc #define M41T62_REG_ALARM_MIN 0xd #define M41T62_REG_ALARM_SEC 0xe -#define M41T62_REG_FLAGS 0xf +#define M41T62_REG_FLAGS 0xf -M41T62::M41T62 (PinName p_sda, PinName p_scl) : i2c(p_sda, p_scl) { +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; } -M41T62::M41T62 (I2C& p_i2c) : i2c(p_i2c) { - M41T62_addr = M41T62ADDR; +void M41T62::read_rtc_std (tm *t){ +rtc_time time; + + read_rtc_direct(&time); + t->tm_sec = time.rtc_seconds; + t->tm_min = time.rtc_minutes; + t->tm_hour = time.rtc_hours; + t->tm_mday = time.rtc_date; + if ( time.rtc_weekday == RTC_Wk_Sunday){ + t->tm_wday = 0; // Sun is not 7 but 0 + } else { + t->tm_wday = time.rtc_weekday; + } + t->tm_mon = time.rtc_month - 1; + t->tm_year = time.rtc_year_raw + 100; + t->tm_isdst= 0; } -void M41T62::read_rtc (rtc_time *tm) { +void M41T62::write_rtc_std (tm *t){ +rtc_time time; + + time.rtc_seconds = t->tm_sec; + time.rtc_minutes = t->tm_min; + time.rtc_hours = t->tm_hour; + time.rtc_date = t->tm_mday; + if ( t->tm_wday == 0){ + time.rtc_weekday = RTC_Wk_Sunday; + } else { + time.rtc_weekday = t->tm_wday; + } + time.rtc_month = t->tm_mon + 1; + time.rtc_year_raw = t->tm_year - 100; + write_rtc_direct(&time); +} + +void M41T62::read_rtc_direct (rtc_time *tm){ uint8_t eep_dt; eep_dt = M41T62_REG_SSEC; @@ -59,10 +94,11 @@ 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; + tm->rtc_year_raw= bcd2bin(rtc_buf[M41T62_REG_YEAR]); + tm->rtc_year = tm->rtc_year_raw + 100 + 1900; } -void M41T62::write_rtc (rtc_time *tm) { +void M41T62::write_rtc_direct (rtc_time *tm){ uint8_t eep_dt; eep_dt = M41T62_REG_SSEC; @@ -70,7 +106,7 @@ 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_YEAR + 1] = bin2bcd(tm->rtc_year_raw); 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); @@ -80,29 +116,44 @@ i2c_write_n_bytes((int)M41T62_addr, (char *)rtc_buf, 9); } -void M41T62::set_sq_wave (uint8_t sqw_dt) { +void M41T62::set_sq_wave (uint8_t sqw_dt){ uint8_t eep_dt[2]; + // set SQW frequency 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); + // set or clear SQWE + eep_dt[0] = M41T62_REG_ALARM_MON; + 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); + if (sqw_dt == RTC_SQW_NONE){ // Clear SQWE + eep_dt[1] = eep_dt[0] & 0xbf; + } else { // Set SQWE + eep_dt[1] = eep_dt[0] | 0x40; + } + eep_dt[0] = M41T62_REG_ALARM_MON; + i2c_write_n_bytes((int)M41T62_addr, (char *)rtc_buf, 2); } -void M41T62::i2c_read_n_bytes (int addr, char *dt, int n) { +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) { +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) { + while (dt >= 10){ bcdhigh++; dt -= 10; }