Revision 0:dc2c526097d2, committed 2012-10-06

Comitter:

ykuroda

Date:

Sat Oct 06 16:38:23 2012 +0000

Commit message:

BCD and RTC utility

Changed in this revision

diff -r 000000000000 -r dc2c526097d2 bcdutil.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bcdutil.cpp	Sat Oct 06 16:38:23 2012 +0000
@@ -0,0 +1,61 @@
+//
+///
+//
+//
+//
+//
+//
+//
+#include "mbed.h"
+#include "bcdutil.h"
+
+
+static struct tm __t;
+static char __rtc_data[20];
+
+unsigned int bin2bcd(unsigned int n)
+{
+    unsigned int bcd=0;
+    unsigned int base=0;
+
+    while (n>0) {
+        bcd |= (n%10)<<base;
+        base += 4;
+        n /= 10;
+    }
+    return bcd;
+}
+
+unsigned char bcd2bin(unsigned char bcd)
+{
+//    return 10*((bcd>>4)&0xF) + bcd&0xF;   // not good. don't know why.
+    unsigned char temp = bcd & 0x0F;
+    while (bcd>=0x10) {
+        temp += 10;
+        bcd -= 0x10;
+    }
+    return temp;
+}
+
+char*
+tm2rtc(struct tm* _t)          // tm -> rtc(BCD)
+{
+    __rtc_data[2] = bin2bcd(_t->tm_sec);
+    __rtc_data[3] = bin2bcd(_t->tm_min);
+    __rtc_data[4] = bin2bcd(_t->tm_hour);
+    __rtc_data[5] = bin2bcd(_t->tm_mday);
+    __rtc_data[7] = bin2bcd(_t->tm_mon);
+    __rtc_data[8] = bin2bcd(_t->tm_year-100);
+    return __rtc_data;
+}
+
+struct tm*
+rtc2tm(char* _bcd) {  // rtc(BCD) -> tm
+    __t.tm_sec = bcd2bin(_bcd[2]&0x7F);      // 0-59
+    __t.tm_min = bcd2bin(_bcd[3]&0x7F);      // 0-59
+    __t.tm_hour= bcd2bin(_bcd[4]&0x3F);      // 0-23
+    __t.tm_mday= bcd2bin(_bcd[5]&0x3F);      // 1-31
+    __t.tm_mon = bcd2bin(_bcd[7]&0x1F);      // 0-11
+    __t.tm_year= bcd2bin(_bcd[8])+100;  // year since 1900
+    return &__t;
+}

diff -r 000000000000 -r dc2c526097d2 bcdutil.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bcdutil.h	Sat Oct 06 16:38:23 2012 +0000
@@ -0,0 +1,20 @@
+//
+///
+//
+//
+//
+//
+//
+//
+#ifndef _BCDUTIL_H
+#define _BCDUTIL_H
+
+
+
+unsigned int bin2bcd(unsigned int n);
+unsigned char bcd2bin(unsigned char bcd);
+char* tm2rtc(struct tm* _t);        // tm -> rtc(BCD)
+struct tm* rtc2tm(char* _bcd);      // rtc(BCD) -> tm
+
+
+#endif