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@3:41c351da2fdf, 2015-02-22 (annotated)
- Committer:
- kenjiArai
- Date:
- Sun Feb 22 01:08:24 2015 +0000
- Revision:
- 3:41c351da2fdf
- Parent:
- 1:9d7702a887d3
- Child:
- 4:0c07690cb24f
added change function for I2C frequency
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kenjiArai | 0:2919f8bd90f3 | 1 | /* |
kenjiArai | 3:41c351da2fdf | 2 | * mbed library program |
kenjiArai | 0:2919f8bd90f3 | 3 | * Control M41T62 RTC Module |
kenjiArai | 0:2919f8bd90f3 | 4 | * |
kenjiArai | 3:41c351da2fdf | 5 | * Copyright (c) 2014,'15 Kenji Arai / JH1PJL |
kenjiArai | 0:2919f8bd90f3 | 6 | * http://www.page.sannet.ne.jp/kenjia/index.html |
kenjiArai | 0:2919f8bd90f3 | 7 | * http://mbed.org/users/kenjiArai/ |
kenjiArai | 0:2919f8bd90f3 | 8 | * Created: June 21st, 2014 |
kenjiArai | 3:41c351da2fdf | 9 | * Revised: Feburary 22nd, 2015 |
kenjiArai | 0:2919f8bd90f3 | 10 | * |
kenjiArai | 0:2919f8bd90f3 | 11 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
kenjiArai | 0:2919f8bd90f3 | 12 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE |
kenjiArai | 0:2919f8bd90f3 | 13 | * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
kenjiArai | 0:2919f8bd90f3 | 14 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
kenjiArai | 0:2919f8bd90f3 | 15 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
kenjiArai | 0:2919f8bd90f3 | 16 | */ |
kenjiArai | 0:2919f8bd90f3 | 17 | /* |
kenjiArai | 0:2919f8bd90f3 | 18 | *---------------- REFERENCE ---------------------------------------------------------------------- |
kenjiArai | 0:2919f8bd90f3 | 19 | * http://www.st-japan.co.jp/web/jp/catalog/sense_power/FM151/CL1410/SC403/PF82507 |
kenjiArai | 1:9d7702a887d3 | 20 | * http://strawberry-linux.com/catalog/items?code=12062 |
kenjiArai | 0:2919f8bd90f3 | 21 | */ |
kenjiArai | 0:2919f8bd90f3 | 22 | |
kenjiArai | 0:2919f8bd90f3 | 23 | #include "mbed.h" |
kenjiArai | 0:2919f8bd90f3 | 24 | #include "m41t62_rtc.h" |
kenjiArai | 0:2919f8bd90f3 | 25 | |
kenjiArai | 3:41c351da2fdf | 26 | M41T62::M41T62 (PinName p_sda, PinName p_scl) : _i2c(p_sda, p_scl) |
kenjiArai | 3:41c351da2fdf | 27 | { |
kenjiArai | 1:9d7702a887d3 | 28 | M41T62_addr = M41T62ADDR; |
kenjiArai | 3:41c351da2fdf | 29 | _i2c.frequency(100000); |
kenjiArai | 1:9d7702a887d3 | 30 | } |
kenjiArai | 1:9d7702a887d3 | 31 | |
kenjiArai | 3:41c351da2fdf | 32 | M41T62::M41T62 (I2C& p_i2c) : _i2c(p_i2c) |
kenjiArai | 3:41c351da2fdf | 33 | { |
kenjiArai | 0:2919f8bd90f3 | 34 | M41T62_addr = M41T62ADDR; |
kenjiArai | 3:41c351da2fdf | 35 | _i2c.frequency(100000); |
kenjiArai | 0:2919f8bd90f3 | 36 | } |
kenjiArai | 0:2919f8bd90f3 | 37 | |
kenjiArai | 3:41c351da2fdf | 38 | void M41T62::read_rtc_std (tm *t) |
kenjiArai | 3:41c351da2fdf | 39 | { |
kenjiArai | 3:41c351da2fdf | 40 | rtc_time time; |
kenjiArai | 1:9d7702a887d3 | 41 | |
kenjiArai | 1:9d7702a887d3 | 42 | read_rtc_direct(&time); |
kenjiArai | 1:9d7702a887d3 | 43 | t->tm_sec = time.rtc_seconds; |
kenjiArai | 1:9d7702a887d3 | 44 | t->tm_min = time.rtc_minutes; |
kenjiArai | 1:9d7702a887d3 | 45 | t->tm_hour = time.rtc_hours; |
kenjiArai | 1:9d7702a887d3 | 46 | t->tm_mday = time.rtc_date; |
kenjiArai | 3:41c351da2fdf | 47 | if ( time.rtc_weekday == RTC_Wk_Sunday) { |
kenjiArai | 1:9d7702a887d3 | 48 | t->tm_wday = 0; // Sun is not 7 but 0 |
kenjiArai | 1:9d7702a887d3 | 49 | } else { |
kenjiArai | 1:9d7702a887d3 | 50 | t->tm_wday = time.rtc_weekday; |
kenjiArai | 1:9d7702a887d3 | 51 | } |
kenjiArai | 1:9d7702a887d3 | 52 | t->tm_mon = time.rtc_month - 1; |
kenjiArai | 1:9d7702a887d3 | 53 | t->tm_year = time.rtc_year_raw + 100; |
kenjiArai | 1:9d7702a887d3 | 54 | t->tm_isdst= 0; |
kenjiArai | 0:2919f8bd90f3 | 55 | } |
kenjiArai | 0:2919f8bd90f3 | 56 | |
kenjiArai | 3:41c351da2fdf | 57 | void M41T62::write_rtc_std (tm *t) |
kenjiArai | 3:41c351da2fdf | 58 | { |
kenjiArai | 3:41c351da2fdf | 59 | rtc_time time; |
kenjiArai | 3:41c351da2fdf | 60 | |
kenjiArai | 1:9d7702a887d3 | 61 | time.rtc_seconds = t->tm_sec; |
kenjiArai | 1:9d7702a887d3 | 62 | time.rtc_minutes = t->tm_min; |
kenjiArai | 1:9d7702a887d3 | 63 | time.rtc_hours = t->tm_hour; |
kenjiArai | 1:9d7702a887d3 | 64 | time.rtc_date = t->tm_mday; |
kenjiArai | 3:41c351da2fdf | 65 | if ( t->tm_wday == 0) { |
kenjiArai | 1:9d7702a887d3 | 66 | time.rtc_weekday = RTC_Wk_Sunday; |
kenjiArai | 1:9d7702a887d3 | 67 | } else { |
kenjiArai | 1:9d7702a887d3 | 68 | time.rtc_weekday = t->tm_wday; |
kenjiArai | 1:9d7702a887d3 | 69 | } |
kenjiArai | 1:9d7702a887d3 | 70 | time.rtc_month = t->tm_mon + 1; |
kenjiArai | 1:9d7702a887d3 | 71 | time.rtc_year_raw = t->tm_year - 100; |
kenjiArai | 1:9d7702a887d3 | 72 | write_rtc_direct(&time); |
kenjiArai | 1:9d7702a887d3 | 73 | } |
kenjiArai | 1:9d7702a887d3 | 74 | |
kenjiArai | 3:41c351da2fdf | 75 | void M41T62::read_rtc_direct (rtc_time *tm) |
kenjiArai | 3:41c351da2fdf | 76 | { |
kenjiArai | 3:41c351da2fdf | 77 | uint8_t eep_dt; |
kenjiArai | 0:2919f8bd90f3 | 78 | |
kenjiArai | 0:2919f8bd90f3 | 79 | eep_dt = M41T62_REG_SSEC; |
kenjiArai | 3:41c351da2fdf | 80 | _i2c.write((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 3:41c351da2fdf | 81 | _i2c.read((int)M41T62_addr, (char *)rtc_buf, 8); |
kenjiArai | 0:2919f8bd90f3 | 82 | tm->rtc_seconds = bcd2bin(rtc_buf[M41T62_REG_SEC] & 0x7f); |
kenjiArai | 0:2919f8bd90f3 | 83 | tm->rtc_minutes = bcd2bin(rtc_buf[M41T62_REG_MIN] & 0x7f); |
kenjiArai | 0:2919f8bd90f3 | 84 | tm->rtc_hours = bcd2bin(rtc_buf[M41T62_REG_HOUR] & 0x3f); |
kenjiArai | 0:2919f8bd90f3 | 85 | tm->rtc_date = bcd2bin(rtc_buf[M41T62_REG_DAY] & 0x3f); |
kenjiArai | 0:2919f8bd90f3 | 86 | tm->rtc_weekday = rtc_buf[M41T62_REG_WDAY] & 0x07; |
kenjiArai | 0:2919f8bd90f3 | 87 | tm->rtc_month = bcd2bin(rtc_buf[M41T62_REG_MON] & 0x1f); |
kenjiArai | 1:9d7702a887d3 | 88 | tm->rtc_year_raw= bcd2bin(rtc_buf[M41T62_REG_YEAR]); |
kenjiArai | 1:9d7702a887d3 | 89 | tm->rtc_year = tm->rtc_year_raw + 100 + 1900; |
kenjiArai | 0:2919f8bd90f3 | 90 | } |
kenjiArai | 0:2919f8bd90f3 | 91 | |
kenjiArai | 3:41c351da2fdf | 92 | void M41T62::write_rtc_direct (rtc_time *tm) |
kenjiArai | 3:41c351da2fdf | 93 | { |
kenjiArai | 3:41c351da2fdf | 94 | uint8_t eep_dt; |
kenjiArai | 0:2919f8bd90f3 | 95 | |
kenjiArai | 0:2919f8bd90f3 | 96 | eep_dt = M41T62_REG_SSEC; |
kenjiArai | 3:41c351da2fdf | 97 | _i2c.write((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 3:41c351da2fdf | 98 | _i2c.read((int)M41T62_addr, (char *)rtc_buf, 8); |
kenjiArai | 0:2919f8bd90f3 | 99 | rtc_buf[0] = M41T62_REG_SSEC; |
kenjiArai | 0:2919f8bd90f3 | 100 | rtc_buf[M41T62_REG_SSEC + 1] = 0; |
kenjiArai | 3:41c351da2fdf | 101 | rtc_buf[M41T62_REG_YEAR + 1] = bin2bcd(tm->rtc_year_raw); |
kenjiArai | 0:2919f8bd90f3 | 102 | rtc_buf[M41T62_REG_MON + 1] = bin2bcd(tm->rtc_month) | (rtc_buf[M41T62_REG_MON] & ~0x1f); |
kenjiArai | 0:2919f8bd90f3 | 103 | rtc_buf[M41T62_REG_DAY + 1] = bin2bcd(tm->rtc_date) | (rtc_buf[M41T62_REG_DAY] & ~0x3f); |
kenjiArai | 0:2919f8bd90f3 | 104 | rtc_buf[M41T62_REG_WDAY + 1] = (tm->rtc_weekday & 0x07) | (rtc_buf[M41T62_REG_WDAY] & ~0x07); |
kenjiArai | 0:2919f8bd90f3 | 105 | rtc_buf[M41T62_REG_HOUR + 1] = bin2bcd(tm->rtc_hours) | (rtc_buf[M41T62_REG_HOUR] & ~0x3f); |
kenjiArai | 0:2919f8bd90f3 | 106 | rtc_buf[M41T62_REG_MIN + 1] = bin2bcd(tm->rtc_minutes) | (rtc_buf[M41T62_REG_MIN] & ~0x7f); |
kenjiArai | 3:41c351da2fdf | 107 | rtc_buf[M41T62_REG_SEC + 1] = bin2bcd(tm->rtc_seconds) | (rtc_buf[M41T62_REG_SEC] & ~0x7f); |
kenjiArai | 3:41c351da2fdf | 108 | _i2c.write((int)M41T62_addr, (char *)rtc_buf, 9); |
kenjiArai | 0:2919f8bd90f3 | 109 | } |
kenjiArai | 0:2919f8bd90f3 | 110 | |
kenjiArai | 3:41c351da2fdf | 111 | void M41T62::frequency(int hz) |
kenjiArai | 3:41c351da2fdf | 112 | { |
kenjiArai | 3:41c351da2fdf | 113 | _i2c.frequency(hz); |
kenjiArai | 3:41c351da2fdf | 114 | } |
kenjiArai | 3:41c351da2fdf | 115 | |
kenjiArai | 3:41c351da2fdf | 116 | void M41T62::set_sq_wave (uint8_t sqw_dt) |
kenjiArai | 3:41c351da2fdf | 117 | { |
kenjiArai | 3:41c351da2fdf | 118 | uint8_t eep_dt[2]; |
kenjiArai | 0:2919f8bd90f3 | 119 | |
kenjiArai | 1:9d7702a887d3 | 120 | // set SQW frequency |
kenjiArai | 0:2919f8bd90f3 | 121 | eep_dt[0] = M41T62_REG_WDAY; |
kenjiArai | 3:41c351da2fdf | 122 | _i2c.write((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 3:41c351da2fdf | 123 | _i2c.read((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 0:2919f8bd90f3 | 124 | eep_dt[1] = (eep_dt[0] & 0x07) | (sqw_dt << 4); |
kenjiArai | 0:2919f8bd90f3 | 125 | eep_dt[0] = M41T62_REG_WDAY; |
kenjiArai | 3:41c351da2fdf | 126 | _i2c.write((int)M41T62_addr, (char *)rtc_buf, 2); |
kenjiArai | 1:9d7702a887d3 | 127 | // set or clear SQWE |
kenjiArai | 1:9d7702a887d3 | 128 | eep_dt[0] = M41T62_REG_ALARM_MON; |
kenjiArai | 3:41c351da2fdf | 129 | _i2c.write((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 3:41c351da2fdf | 130 | _i2c.read((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 1:9d7702a887d3 | 131 | eep_dt[1] = (eep_dt[0] & 0x07) | (sqw_dt << 4); |
kenjiArai | 1:9d7702a887d3 | 132 | eep_dt[0] = M41T62_REG_WDAY; |
kenjiArai | 3:41c351da2fdf | 133 | _i2c.write((int)M41T62_addr, (char *)rtc_buf, 2); |
kenjiArai | 3:41c351da2fdf | 134 | if (sqw_dt == RTC_SQW_NONE) { // Clear SQWE |
kenjiArai | 1:9d7702a887d3 | 135 | eep_dt[1] = eep_dt[0] & 0xbf; |
kenjiArai | 1:9d7702a887d3 | 136 | } else { // Set SQWE |
kenjiArai | 1:9d7702a887d3 | 137 | eep_dt[1] = eep_dt[0] | 0x40; |
kenjiArai | 1:9d7702a887d3 | 138 | } |
kenjiArai | 1:9d7702a887d3 | 139 | eep_dt[0] = M41T62_REG_ALARM_MON; |
kenjiArai | 3:41c351da2fdf | 140 | _i2c.write((int)M41T62_addr, (char *)rtc_buf, 2); |
kenjiArai | 0:2919f8bd90f3 | 141 | } |
kenjiArai | 0:2919f8bd90f3 | 142 | |
kenjiArai | 3:41c351da2fdf | 143 | uint8_t M41T62::bin2bcd (uint8_t dt) |
kenjiArai | 3:41c351da2fdf | 144 | { |
kenjiArai | 3:41c351da2fdf | 145 | uint8_t bcdhigh = 0; |
kenjiArai | 0:2919f8bd90f3 | 146 | |
kenjiArai | 3:41c351da2fdf | 147 | while (dt >= 10) { |
kenjiArai | 0:2919f8bd90f3 | 148 | bcdhigh++; |
kenjiArai | 0:2919f8bd90f3 | 149 | dt -= 10; |
kenjiArai | 0:2919f8bd90f3 | 150 | } |
kenjiArai | 0:2919f8bd90f3 | 151 | return ((uint8_t)(bcdhigh << 4) | dt); |
kenjiArai | 0:2919f8bd90f3 | 152 | } |
kenjiArai | 0:2919f8bd90f3 | 153 | |
kenjiArai | 3:41c351da2fdf | 154 | uint8_t M41T62::bcd2bin (uint8_t dt) |
kenjiArai | 3:41c351da2fdf | 155 | { |
kenjiArai | 3:41c351da2fdf | 156 | uint8_t tmp = 0; |
kenjiArai | 0:2919f8bd90f3 | 157 | |
kenjiArai | 0:2919f8bd90f3 | 158 | tmp = ((uint8_t)(dt & (uint8_t)0xf0) >> (uint8_t)0x4) * 10; |
kenjiArai | 0:2919f8bd90f3 | 159 | return (tmp + (dt & (uint8_t)0x0f)); |
kenjiArai | 0:2919f8bd90f3 | 160 | } |