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/************************************************************************/
/* */
/* 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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