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@0:2919f8bd90f3, 2014-06-21 (annotated)
- Committer:
- kenjiArai
- Date:
- Sat Jun 21 04:37:56 2014 +0000
- Revision:
- 0:2919f8bd90f3
- Child:
- 1:9d7702a887d3
1st fixed version
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kenjiArai | 0:2919f8bd90f3 | 1 | /* |
kenjiArai | 0:2919f8bd90f3 | 2 | * mbed library program |
kenjiArai | 0:2919f8bd90f3 | 3 | * Control M41T62 RTC Module |
kenjiArai | 0:2919f8bd90f3 | 4 | * |
kenjiArai | 0:2919f8bd90f3 | 5 | * Copyright (c) 2014 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 | 0:2919f8bd90f3 | 9 | * Revised: June 21st, 2014 |
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 | 0:2919f8bd90f3 | 20 | */ |
kenjiArai | 0:2919f8bd90f3 | 21 | |
kenjiArai | 0:2919f8bd90f3 | 22 | #include "mbed.h" |
kenjiArai | 0:2919f8bd90f3 | 23 | #include "m41t62_rtc.h" |
kenjiArai | 0:2919f8bd90f3 | 24 | |
kenjiArai | 0:2919f8bd90f3 | 25 | |
kenjiArai | 0:2919f8bd90f3 | 26 | // Register definition |
kenjiArai | 0:2919f8bd90f3 | 27 | #define M41T62_REG_SSEC 0 |
kenjiArai | 0:2919f8bd90f3 | 28 | #define M41T62_REG_SEC 1 |
kenjiArai | 0:2919f8bd90f3 | 29 | #define M41T62_REG_MIN 2 |
kenjiArai | 0:2919f8bd90f3 | 30 | #define M41T62_REG_HOUR 3 |
kenjiArai | 0:2919f8bd90f3 | 31 | #define M41T62_REG_WDAY 4 |
kenjiArai | 0:2919f8bd90f3 | 32 | #define M41T62_REG_DAY 5 |
kenjiArai | 0:2919f8bd90f3 | 33 | #define M41T62_REG_MON 6 |
kenjiArai | 0:2919f8bd90f3 | 34 | #define M41T62_REG_YEAR 7 |
kenjiArai | 0:2919f8bd90f3 | 35 | #define M41T62_REG_ALARM_MON 0xa |
kenjiArai | 0:2919f8bd90f3 | 36 | #define M41T62_REG_ALARM_DAY 0xb |
kenjiArai | 0:2919f8bd90f3 | 37 | #define M41T62_REG_ALARM_HOUR 0xc |
kenjiArai | 0:2919f8bd90f3 | 38 | #define M41T62_REG_ALARM_MIN 0xd |
kenjiArai | 0:2919f8bd90f3 | 39 | #define M41T62_REG_ALARM_SEC 0xe |
kenjiArai | 0:2919f8bd90f3 | 40 | #define M41T62_REG_FLAGS 0xf |
kenjiArai | 0:2919f8bd90f3 | 41 | |
kenjiArai | 0:2919f8bd90f3 | 42 | M41T62::M41T62 (PinName p_sda, PinName p_scl) : i2c(p_sda, p_scl) { |
kenjiArai | 0:2919f8bd90f3 | 43 | M41T62_addr = M41T62ADDR; |
kenjiArai | 0:2919f8bd90f3 | 44 | } |
kenjiArai | 0:2919f8bd90f3 | 45 | |
kenjiArai | 0:2919f8bd90f3 | 46 | M41T62::M41T62 (I2C& p_i2c) : i2c(p_i2c) { |
kenjiArai | 0:2919f8bd90f3 | 47 | M41T62_addr = M41T62ADDR; |
kenjiArai | 0:2919f8bd90f3 | 48 | } |
kenjiArai | 0:2919f8bd90f3 | 49 | |
kenjiArai | 0:2919f8bd90f3 | 50 | void M41T62::read_rtc (rtc_time *tm) { |
kenjiArai | 0:2919f8bd90f3 | 51 | uint8_t eep_dt; |
kenjiArai | 0:2919f8bd90f3 | 52 | |
kenjiArai | 0:2919f8bd90f3 | 53 | eep_dt = M41T62_REG_SSEC; |
kenjiArai | 0:2919f8bd90f3 | 54 | i2c_write_n_bytes((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 0:2919f8bd90f3 | 55 | i2c_read_n_bytes((int)M41T62_addr, (char *)rtc_buf, 8); |
kenjiArai | 0:2919f8bd90f3 | 56 | tm->rtc_seconds = bcd2bin(rtc_buf[M41T62_REG_SEC] & 0x7f); |
kenjiArai | 0:2919f8bd90f3 | 57 | tm->rtc_minutes = bcd2bin(rtc_buf[M41T62_REG_MIN] & 0x7f); |
kenjiArai | 0:2919f8bd90f3 | 58 | tm->rtc_hours = bcd2bin(rtc_buf[M41T62_REG_HOUR] & 0x3f); |
kenjiArai | 0:2919f8bd90f3 | 59 | tm->rtc_date = bcd2bin(rtc_buf[M41T62_REG_DAY] & 0x3f); |
kenjiArai | 0:2919f8bd90f3 | 60 | tm->rtc_weekday = rtc_buf[M41T62_REG_WDAY] & 0x07; |
kenjiArai | 0:2919f8bd90f3 | 61 | tm->rtc_month = bcd2bin(rtc_buf[M41T62_REG_MON] & 0x1f); |
kenjiArai | 0:2919f8bd90f3 | 62 | tm->rtc_year = bcd2bin(rtc_buf[M41T62_REG_YEAR]) + 100 + 1900; |
kenjiArai | 0:2919f8bd90f3 | 63 | } |
kenjiArai | 0:2919f8bd90f3 | 64 | |
kenjiArai | 0:2919f8bd90f3 | 65 | void M41T62::write_rtc (rtc_time *tm) { |
kenjiArai | 0:2919f8bd90f3 | 66 | uint8_t eep_dt; |
kenjiArai | 0:2919f8bd90f3 | 67 | |
kenjiArai | 0:2919f8bd90f3 | 68 | eep_dt = M41T62_REG_SSEC; |
kenjiArai | 0:2919f8bd90f3 | 69 | i2c_write_n_bytes((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 0:2919f8bd90f3 | 70 | i2c_read_n_bytes((int)M41T62_addr, (char *)rtc_buf, 8); |
kenjiArai | 0:2919f8bd90f3 | 71 | rtc_buf[0] = M41T62_REG_SSEC; |
kenjiArai | 0:2919f8bd90f3 | 72 | rtc_buf[M41T62_REG_SSEC + 1] = 0; |
kenjiArai | 0:2919f8bd90f3 | 73 | rtc_buf[M41T62_REG_YEAR + 1] = bin2bcd((uint8_t)(tm->rtc_year % 100)); |
kenjiArai | 0:2919f8bd90f3 | 74 | rtc_buf[M41T62_REG_MON + 1] = bin2bcd(tm->rtc_month) | (rtc_buf[M41T62_REG_MON] & ~0x1f); |
kenjiArai | 0:2919f8bd90f3 | 75 | rtc_buf[M41T62_REG_DAY + 1] = bin2bcd(tm->rtc_date) | (rtc_buf[M41T62_REG_DAY] & ~0x3f); |
kenjiArai | 0:2919f8bd90f3 | 76 | rtc_buf[M41T62_REG_WDAY + 1] = (tm->rtc_weekday & 0x07) | (rtc_buf[M41T62_REG_WDAY] & ~0x07); |
kenjiArai | 0:2919f8bd90f3 | 77 | rtc_buf[M41T62_REG_HOUR + 1] = bin2bcd(tm->rtc_hours) | (rtc_buf[M41T62_REG_HOUR] & ~0x3f); |
kenjiArai | 0:2919f8bd90f3 | 78 | rtc_buf[M41T62_REG_MIN + 1] = bin2bcd(tm->rtc_minutes) | (rtc_buf[M41T62_REG_MIN] & ~0x7f); |
kenjiArai | 0:2919f8bd90f3 | 79 | rtc_buf[M41T62_REG_SEC + 1] = bin2bcd(tm->rtc_seconds) | (rtc_buf[M41T62_REG_SEC] & ~0x7f); |
kenjiArai | 0:2919f8bd90f3 | 80 | i2c_write_n_bytes((int)M41T62_addr, (char *)rtc_buf, 9); |
kenjiArai | 0:2919f8bd90f3 | 81 | } |
kenjiArai | 0:2919f8bd90f3 | 82 | |
kenjiArai | 0:2919f8bd90f3 | 83 | void M41T62::set_sq_wave (uint8_t sqw_dt) { |
kenjiArai | 0:2919f8bd90f3 | 84 | uint8_t eep_dt[2]; |
kenjiArai | 0:2919f8bd90f3 | 85 | |
kenjiArai | 0:2919f8bd90f3 | 86 | eep_dt[0] = M41T62_REG_WDAY; |
kenjiArai | 0:2919f8bd90f3 | 87 | i2c_write_n_bytes((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 0:2919f8bd90f3 | 88 | i2c_read_n_bytes((int)M41T62_addr, (char *)eep_dt, 1); |
kenjiArai | 0:2919f8bd90f3 | 89 | eep_dt[1] = (eep_dt[0] & 0x07) | (sqw_dt << 4); |
kenjiArai | 0:2919f8bd90f3 | 90 | eep_dt[0] = M41T62_REG_WDAY; |
kenjiArai | 0:2919f8bd90f3 | 91 | i2c_write_n_bytes((int)M41T62_addr, (char *)rtc_buf, 2); |
kenjiArai | 0:2919f8bd90f3 | 92 | } |
kenjiArai | 0:2919f8bd90f3 | 93 | |
kenjiArai | 0:2919f8bd90f3 | 94 | void M41T62::i2c_read_n_bytes (int addr, char *dt, int n) { |
kenjiArai | 0:2919f8bd90f3 | 95 | i2c.read(addr, dt, n); |
kenjiArai | 0:2919f8bd90f3 | 96 | } |
kenjiArai | 0:2919f8bd90f3 | 97 | |
kenjiArai | 0:2919f8bd90f3 | 98 | void M41T62::i2c_write_n_bytes (int addr, char *dt, int n) { |
kenjiArai | 0:2919f8bd90f3 | 99 | i2c.write(addr, dt, n); |
kenjiArai | 0:2919f8bd90f3 | 100 | } |
kenjiArai | 0:2919f8bd90f3 | 101 | |
kenjiArai | 0:2919f8bd90f3 | 102 | uint8_t M41T62::bin2bcd (uint8_t dt){ |
kenjiArai | 0:2919f8bd90f3 | 103 | uint8_t bcdhigh = 0; |
kenjiArai | 0:2919f8bd90f3 | 104 | |
kenjiArai | 0:2919f8bd90f3 | 105 | while (dt >= 10) { |
kenjiArai | 0:2919f8bd90f3 | 106 | bcdhigh++; |
kenjiArai | 0:2919f8bd90f3 | 107 | dt -= 10; |
kenjiArai | 0:2919f8bd90f3 | 108 | } |
kenjiArai | 0:2919f8bd90f3 | 109 | return ((uint8_t)(bcdhigh << 4) | dt); |
kenjiArai | 0:2919f8bd90f3 | 110 | } |
kenjiArai | 0:2919f8bd90f3 | 111 | |
kenjiArai | 0:2919f8bd90f3 | 112 | uint8_t M41T62::bcd2bin (uint8_t dt){ |
kenjiArai | 0:2919f8bd90f3 | 113 | uint8_t tmp = 0; |
kenjiArai | 0:2919f8bd90f3 | 114 | |
kenjiArai | 0:2919f8bd90f3 | 115 | tmp = ((uint8_t)(dt & (uint8_t)0xf0) >> (uint8_t)0x4) * 10; |
kenjiArai | 0:2919f8bd90f3 | 116 | return (tmp + (dt & (uint8_t)0x0f)); |
kenjiArai | 0:2919f8bd90f3 | 117 | } |
kenjiArai | 0:2919f8bd90f3 | 118 |