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