Diff: ds1302.cpp

Revision:

0:be8d71b29b37

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ds1302.cpp	Fri Dec 03 18:01:36 2010 +0000
@@ -0,0 +1,128 @@
+/*
+  Copyright (c) 2010 Cibeira Gerardo
+*/
+
+#include "ds1302.h"
+#include "mbed.h"
+
+//constructor
+ds1302::ds1302(PinName pinSCLK,PinName pinIO,PinName pinRST) : SCLK(pinSCLK),IO(pinIO),RST(pinRST) {}
+
+//methods
+void ds1302::write_byte(BYTE cmd)
+{
+    BYTE i;
+    IO.output();
+    for(i=0;i<=7;i++)
+    {
+        IO = (cmd >> i) & 0x01;
+        wait_us(1);
+        SCLK=1;
+        wait_us(1);
+        SCLK=0;
+    }
+    IO.input();
+}
+
+void ds1302::write(BYTE cmd, BYTE data)
+{
+    RST=1;
+    wait_us(1);
+    write_byte(cmd);
+    write_byte(data);
+    RST=0;
+}
+
+BYTE ds1302::read(BYTE cmd)
+{
+    BYTE i,data=0;
+    
+    RST=1;
+    write_byte(cmd);
+    
+    IO.input();
+    wait_us(1);
+    
+    for(i=0;i<=7;i++)
+    {
+       data += IO<<i;
+       SCLK=1;
+       wait_us(1);
+       SCLK=0;
+       wait_us(1);
+    }
+    RST=0;
+    
+    return(data);
+}
+
+void ds1302::init()
+{
+    BYTE x;
+    RST=0;
+    wait_us(2);
+    SCLK=0;
+    write(0x8e,0);
+    write(0x90,0xa4);
+    x=read(0x81);
+    if((x & 0x80)!=0)
+        write(0x80,0);
+}
+
+BYTE ds1302::get_bcd(BYTE data)
+{
+    BYTE nibh=0;
+    BYTE nibl=0;
+    
+    nibh = data/10;
+    nibl = data-(nibh*10);
+    
+    return( (nibh<<4) | nibl);
+}
+
+BYTE ds1302::rm_bcd(BYTE data)
+{
+    BYTE i,aux=0;
+    
+    i = data;
+    aux = (i>>4)*10;
+    aux += (i & 0x0F);
+    
+    return aux;
+}
+
+void ds1302::set_datetime(BYTE day, BYTE mth, BYTE year, BYTE dow, BYTE hr, BYTE min)
+{
+    write(0x86,get_bcd(day));
+    write(0x88,get_bcd(mth));
+    write(0x8c,get_bcd(year));
+    write(0x8a,get_bcd(dow));
+    write(0x84,get_bcd(hr));
+    write(0x82,get_bcd(min));
+    write(0x80,get_bcd(0));
+}
+
+void ds1302::get_date(BYTE &day, BYTE &mth, BYTE &year, BYTE &dow)
+{
+    day = rm_bcd(read(0x87));
+    mth = rm_bcd(read(0x89));
+    year = rm_bcd(read(0x8d));
+    dow = rm_bcd(read(0x8b));
+}
+
+void ds1302::get_time(BYTE &hr, BYTE &min, BYTE &sec)
+{
+    hr = rm_bcd(read(0x85));
+    min = rm_bcd(read(0x83));
+    sec = rm_bcd(read(0x81));
+}
+
+void ds1302::write_nvr(BYTE address, BYTE data)
+{
+    write(address|0xc0,data);
+}
+
+BYTE ds1302::read_nvr(BYTE address)
+{
+     return(read(address|0xc1));
+}
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