From 561887acffccb8d4757d931eedfa2e494946efd1 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Thu, 21 Sep 2017 21:58:08 -0400
Subject: basic functionality now works

---
 src/ds3231.rs | 49 +++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 39 insertions(+), 10 deletions(-)

(limited to 'src/ds3231.rs')

diff --git a/src/ds3231.rs b/src/ds3231.rs
index 6ad75d8..6b20958 100644
--- a/src/ds3231.rs
+++ b/src/ds3231.rs
@@ -3,19 +3,22 @@ use ::i2c::{I2C, TransDir};
 
 const DS3231_ADDR: u8 = 0b1101000;
 const DS3231_REG_SEC: u8 = 0x00;
+const DS3231_REG_CTL: u8 = 0x0e;
 
 pub struct DS3231<'a> {
     i2c: I2C<'a>
 }
 
 pub struct Date {
-    second: u8,
-    minute: u8,
-    hour: u8,
-    day: u8,
-    date: u8,
-    month: u8,
-    year: u8
+    pub second: u8,
+    pub minute: u8,
+    pub hour: u8,
+    pub day: u8,
+    pub date: u8,
+    pub month: u8,
+    pub year: u8,
+    pub am: bool,
+    pub am_enable: bool
 }
 
 impl<'a> DS3231<'a> {
@@ -31,6 +34,17 @@ impl<'a> DS3231<'a> {
         ((dec / 10) << 4) | (dec % 10)
     }
 
+    pub fn init(&self) {
+        let i2c = &self.i2c;
+        i2c.init();
+        i2c.start(true, true);
+        i2c.send_addr(DS3231_ADDR, TransDir::TRANSMITTER, true);
+        i2c.send(DS3231_REG_CTL, true);
+        i2c.send(0x00, true);
+        i2c.send(0x00, true);
+        i2c.stop(true);
+    }
+
     pub fn read_fulldate(&self) -> Date {
         let mut buf: [u8; 7] = [0; 7];
         let i2c = &self.i2c;
@@ -47,20 +61,35 @@ impl<'a> DS3231<'a> {
         i2c.conf_ack(false); /* disable ack (send nack) */
         buf[6] = i2c.recv(true);
         i2c.stop(true);
+        let am_enable = (buf[2] >> 6) & 1 == 1;
+        let hour = if am_enable {
+            (buf[2] & 0x0f) + ((buf[2] >> 4) & 1) * 10
+        } else {
+            DS3231::bcd2dec(buf[2])
+        };
+        let am = if am_enable {(buf[2] >> 5) & 1 == 0} else {hour < 12};
         Date{second: DS3231::bcd2dec(buf[0]),
              minute: DS3231::bcd2dec(buf[1]),
-             hour: DS3231::bcd2dec(buf[2]),
+             hour: hour,
              day: DS3231::bcd2dec(buf[3]),
              date: DS3231::bcd2dec(buf[4]),
              month: DS3231::bcd2dec(buf[5]),
-             year: DS3231::bcd2dec(buf[6])}
+             year: DS3231::bcd2dec(buf[6]),
+             am: am,
+             am_enable: am_enable}
     }
 
     pub fn write_fulldate(&self, date: &Date) {
         let i2c = &self.i2c;
+        let hour = if date.am_enable {
+            (1 << 6) | ((if date.am {0} else {1}) << 5) |
+            ((date.hour % 10) << 4) | (date.hour & 0x0f)
+        } else {
+            DS3231::dec2bcd(date.hour)
+        };
         let buf: [u8; 7] = [DS3231::dec2bcd(date.second),
                             DS3231::dec2bcd(date.minute),
-                            DS3231::dec2bcd(date.hour),
+                            hour,
                             DS3231::dec2bcd(date.day),
                             DS3231::dec2bcd(date.date),
                             DS3231::dec2bcd(date.month),
-- 
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