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Simple demo showing use of DS3231 Alarms
Revision 0:0cbd468ebbc1, committed 2017-02-28
- Comitter:
- j3
- Date:
- Tue Feb 28 20:53:56 2017 +0000
- Commit message:
- Init commit
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ds3231.lib Tue Feb 28 20:53:56 2017 +0000 @@ -0,0 +1,1 @@ +https://developer.mbed.org/users/j3/code/ds3231/#e1c0f63595d9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Tue Feb 28 20:53:56 2017 +0000 @@ -0,0 +1,178 @@ +/****************************************************************************** +* MIT License +* +* Copyright (c) 2017 Justin J. Jordan +* +* Permission is hereby granted, free of charge, to any person obtaining a copy +* of this software and associated documentation files (the "Software"), to deal +* in the Software without restriction, including without limitation the rights +* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +* copies of the Software, and to permit persons to whom the Software is +* furnished to do so, subject to the following conditions: + +* The above copyright notice and this permission notice shall be included in all +* copies or substantial portions of the Software. + +* 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. +******************************************************************************/ + + +#include "mbed.h" +#include "ds3231.h" + +#define TERM_HOME ("\033[H") +#define TERM_CLEAR_FROM_CURSOR ("\033[0J") +#define TERM_CLEAR_EOL ("\033[K") + +#define DS3231_WRITE_ADRS (0x68 << 1) +#define DS3231_READ_ADRS ((0x68 << 1) | 1) +#define ALARM_1_BIT (1) +#define ALARM_2_BIT (2) +#define STATUS_REG_ADRS (0x0F) + +//I2C Bus +I2C i2c(D14, D15); + +//DS3231 INT pin connected to D2 with pull-up +InterruptIn rtc_int(D2); + +//Flags for loop +volatile bool alarm1_flag = false; +volatile bool alarm2_flag = false; + +void rtc_isr() +{ + char data[2]; + uint8_t status; + data[0] = STATUS_REG_ADRS; + + //Set pointer in DS3231 + i2c.write(DS3231_WRITE_ADRS, data, 1); + //Read status register + i2c.read(DS3231_READ_ADRS, (data + 1), 1); + //Save status register in status var + status = data[1]; + //Clear data[1] for clearing flags in DS3231 + data[1] = 0; + i2c.write(DS3231_WRITE_ADRS, data, 2); + + if(status & ALARM_1_BIT) + { + alarm1_flag = true; + } + + if(status & ALARM_2_BIT) + { + alarm2_flag = true; + } +} + +int main() +{ + //DS3231 rtc + Ds3231 rtc(i2c); + + // !!!**** Read DS3231 datasheet, page 12. ****!!! + ds3231_cntl_stat_t rtc_control_status; + //Bit2 - !INT/SQW pin used for Interrupts + //Bit1 - A2IE set to allow for Alarm2 interrupt + //Bit0 - A1IE set to allow for Alarm1 interrupt + rtc_control_status.control = 0x07; + rtc_control_status.status = 0; + + //write control, control/status registers + rtc.set_cntl_stat_reg(rtc_control_status); + + //Set time + ds3231_time_t rtc_time; + rtc_time.seconds = 0; + rtc_time.minutes = 0; + rtc_time.hours = 0; + rtc_time.mode = false; //24Hr mode + + //write timming registers + rtc.set_time(rtc_time); + + //Set date + ds3231_calendar_t rtc_calendar; + rtc_calendar.day = 3; + rtc_calendar.date = 28; + rtc_calendar.month = 2; + rtc_calendar.year = 17; + + //write calendar registers + rtc.set_calendar(rtc_calendar); + + // !!!**** Read DS3231 datasheet, page 12****!!! + // !!!**** Table 2 describes am A#M# bits****!!! + //Alarm configuration vars + ds3231_alrm_t alarm1_config, alarm2_config; + + //Configure Alarm1 to cause interrupt every minute at 30 second mark + alarm1_config.seconds = 30; + alarm1_config.minutes = 0; + alarm1_config.hours = 0; + alarm1_config.day = 1; + alarm1_config.date = 1; + alarm1_config.am4 = true; + alarm1_config.am3 = true; + alarm1_config.am2 = true; + alarm1_config.am1 = false; + alarm1_config.am_pm = false; + alarm1_config.mode = false; + alarm1_config.dy_dt = true; + + //write alarm1 registers + rtc.set_alarm(alarm1_config, true); + + //Configure Alarm2 to cause interrupt every minute + //Seconds and am1 not used for alarm2, + //can only trigger on minutes and longer + alarm2_config = alarm1_config; + + //write alarm2 registers + rtc.set_alarm(alarm2_config, false); + + //Tie D2 falling edge to rtc_isr + rtc_int.fall(&rtc_isr); + + char buffer[32]; + time_t epoch_time; + + while(1) + { + printf(TERM_HOME); + + //new epoch time fx + epoch_time = rtc.get_epoch(); + + printf("\nTime as seconds since January 1, 1970 = %d\n", epoch_time); + + printf("\nTime as a basic string = %s", ctime(&epoch_time)); + + strftime(buffer, 32, "%I:%M %p\n", localtime(&epoch_time)); + printf("\nTime as a custom formatted string = %s\n\n", buffer); + + printf(TERM_CLEAR_FROM_CURSOR); + + if(alarm1_flag) + { + alarm1_flag = false; + printf("\n!!! ALARM 1 Triggered !!!\n"); + wait(5.0); + } + + if(alarm2_flag) + { + alarm2_flag = false; + printf("\n*** ALARM 2 Triggered ***\n"); + wait(5.0); + } + } +} \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Feb 28 20:53:56 2017 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/ef9c61f8c49f \ No newline at end of file