From 75a61c57fb0402f777bfa828dd71818a97ed54a4 Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Sun, 1 Apr 2012 00:20:25 +0200
Subject: original dcf77 C code

---
 max7219.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 max7219.c

(limited to 'max7219.c')

diff --git a/max7219.c b/max7219.c
new file mode 100644
index 0000000..a1e0da3
--- /dev/null
+++ b/max7219.c
@@ -0,0 +1,133 @@
+/************************************************************************/
+/*                                                                      */
+/*			7 Segment Driver MAX7219			*/
+/*			Common Anode Display				*/
+/*                                                                      */
+/*              Author: Peter Dannegger                                 */
+/*                      danni@specs.de                                  */
+/*                                                                      */
+/************************************************************************/
+
+#include "main.h"
+#include "max7219.h"
+
+u8 brightness = 5;
+
+u8 code digits[] = { DIGITS };
+
+u8 displaymem[8] = { CHAR_SPACE,	// 8 digits, msb first
+		     CHAR_SPACE,
+		     CHAR_SPACE,
+		     CHAR_SPACE,
+		     CHAR_SPACE,
+		     CHAR_SPACE,
+		     CHAR_SPACE,
+		     CHAR_SPACE };
+
+u8 code charset[] = {		// Definition Character Set
+	_A+_B+_C+_D+_E+_F   ,		// CHAR_0
+	   _B+_C	    ,		// CHAR_1
+	_A+_B+   _D+_E+   _G,		// CHAR_2
+	_A+_B+_C+_D+      _G,		// CHAR_3
+	   _B+_C+      _F+_G,		// CHAR_4
+	_A+   _C+_D+   _F+_G,		// CHAR_5
+	_A+   _C+_D+_E+_F+_G,		// CHAR_6
+	_A+_B+_C            ,		// CHAR_7
+	_A+_B+_C+_D+_E+_F+_G,		// CHAR_8
+	_A+_B+_C+_D   +_F+_G,		// CHAR_9
+	_A+_B+_C+   _E+_F+_G,		// CHAR_A
+	      _C+_D+_E+_F+_G,		// CHAR_b
+		 _D+_E+   _G,		// CHAR_c	;'c'
+	   _B+_C+_D+_E+   _G,		// CHAR_d
+	_A+      _D+_E+_F+_G,		// CHAR_E
+	_A+         _E+_F+_G,		// CHAR_F
+	0                   ,		// 16 = SPACE
+			  _G,		// 17 = MINUS
+	_A+_B+         _F+_G,		// 18 = GRAD
+	_A+      _D+_E+_F   ,		// 19 = CHAR_C2	;'C'
+		    _E+   _G,		// 20 = CHAR_r
+	      _C+_D+_E+   _G,		// 21 = CHAR_o
+	   _B+_C+   _E+_F+_G,		// 22 = H
+		 _D+_E+_F   ,		// 23 = L
+		 _D	    ,		// 24 = _
+	_A		    ,		// 25 = upper "-"
+	_A+_B+      _E+_F+_G,		// CHAR_P
+	   _B+_C+_D+_E+_F   ,		// CHAR_U
+	_A+_B+_C+   _E+_F   		// CHAR_M
+	};
+
+
+void display_write( u16 dc )
+{
+  u8 i;
+
+  MAX7219_DDR |= 1<<MAX7219_DO;
+  MAX7219_DDR |= 1<<MAX7219_SCK;
+  MAX7219_DDR |= 1<<MAX7219_STB;
+  MAX7219_PORT &= ~(1<<MAX7219_STB);
+
+  for( i = 12; i; i-- ){
+    MAX7219_PORT &= ~(1<<MAX7219_SCK);
+    MAX7219_PORT |= 1<<MAX7219_DO;
+    if( (dc & 0x0800) == 0 )
+      MAX7219_PORT &= ~(1<<MAX7219_DO);
+    dc <<= 1;
+    MAX7219_PORT |= 1<<MAX7219_SCK;
+  }
+
+  MAX7219_PORT |= 1<<MAX7219_STB;
+}
+
+
+void display_out( void )
+{
+  u8 * dptr;
+  u8 i, j, byte;
+
+  display_write( 0xC01 );
+
+  dptr = displaymem;
+  for( i = 8; i; i-- ){
+    j = LPM(charset + (*dptr & 0x3F));		// convert to 7-segment
+    if( *dptr & 0x80 )
+      j |= _DP;					// set decimal point
+    *dptr++ = j;
+  }
+
+  for( i = 8; i; i-- ){				// for all segments
+    dptr = displaymem;
+    byte = 0;
+    for( j = 8; j; j-- ){			// collect all digits
+      if( *dptr & 1 )
+        byte |= LPM(digits+j-1);		// digit order mask
+      *dptr >>= 1;				// next segment
+      dptr++;
+    }
+    display_write( byte + i * 256);		// output same segments
+  }
+}
+
+
+void display_clear( void )
+{
+  u8 i;
+
+  for( i = 8; i; i--)
+    displaymem[i-1] = CHAR_SPACE;
+}
+
+
+void display_init( void )
+{
+  display_write( 0xF00 );		// Testmode off
+  display_write( 0x900 );		// Decode off
+  display_write( 0xB07 );		// 8 Digits
+  display_write( 0xC01 );		// Display on
+  display_write( 0xA00 | brightness );	// Brightness
+}
+
+
+void display_off( void )
+{
+  display_write( 0xC00 );
+}
-- 
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