pal_library.c

Pal Signal generation with 8-Bit microcontroller. PIC18F4620

/*
 * file         : PAL_library.c
 * project      : PIC PAL SOFTWARE VIDEO GENERATOR
 * author       : Bruno Gavand
 * compiler     : mikroC V6.2
 * date         : January 17, 2006
 * updated      : April 30, 2008
 *                      minor adjustment for mikroC V8.1
 *
 * description  :
 *      PAL library for PIC18 MCU
 *      This library turns your PIC18 into a B&W PAL software video generator
 *
 * schematic :
		 	     ___
	RB0 (LUM)	+---|___|---+
			    100     |
	  		     ____   |
	RE0 (SYNC)	+---|____|--+--------> VIDEO OUT (to TV video input)
			    1K
		
	GND 		+--------------------> GND
	
 *
 * target devices :
 *      Tested with PIC18F452 and PIC18F4620 @ 32 Mhz (8 Mhz crystal + HS PLL)
 *
 * Licence :
 *      Feel free to use this source code at your own risks.
 *
 * history :
 *
 * see more details on http://www.micro-examples.com/
 */

#include        "PAL_Library.h"

/*
 * I/O definition
 */
#define PAL_BSYNC   PORTE.F0    // bit for synchronization
#define PAL_BVID    PORTD.F0    // bit for luminance. Note : full PORT is reserved !

#define PAL_DELAY4  1           // real delay in microsecond for 4 祍 pulse
#define PAL_DELAY28 20          // real delay in microsecond for 28 祍 pulse

/********************
 * MACRO DEFINITIONS
 ********************/
 
/*
 * create picture border
 */
#define PAL_MAKE_BORDER asm MOVFF _PAL_border, PORTD

/*
 * header to load first group of 8 pixels
 */
#define PAL_BLOCK_HEAD\
                        asm { MOVFF	PAL_ISR_ptr_L2, FSR0L }\
                        asm { MOVFF	PAL_ISR_ptr_L2+1, FSR0H }\
                        asm { MOVFF	POSTINC0, PORTD }

/*
 * process 8 pixels
 * pre-fetch next 8 pixels
 */
#define PAL_BLOCK_SHIFT\
                        asm { INFSNZ	PAL_ISR_ptr_L2, 1, 1 }\
                        asm { INCF	PAL_ISR_ptr_L2+1, 1, 1 }\
                        asm { RRCF	PORTD, 1, 0 }\
                        asm { MOVFF	PAL_ISR_ptr_L2, FSR0L }\
                        asm { RRCF	PORTD, 1, 0 }\
                        asm { MOVFF	PAL_ISR_ptr_L2+1, FSR0H }\
                        asm { RRCF	PORTD, 1, 0 }\
                        asm { nop }\
                        asm { RRCF	PORTD, 1, 0 }\
                        asm { nop }\
                        asm { RRCF	PORTD, 1, 0 }\
                        asm { nop }\
                        asm { RRCF	PORTD, 1, 0 }\
                        asm { nop }\
                        asm { RRCF	PORTD, 1, 0 }\
                        asm { nop }

/*
 * load 8 pixel bloc
 */
#define PAL_BLOCK_LOAD\
                        asm { MOVFF	POSTINC0, PORTD }

/*
 * set video signal to SYNC or BLACK for d 祍
 */
#define PAL_HSYNC(d)        PAL_BVID = 0 ; PAL_BSYNC = 0 ; Delay_us(d)
#define PAL_BLACK(d)        PAL_BVID = 0 ; PAL_BSYNC = 1 ; Delay_us(d)

/*
 * vertical sync line is made of 4 levels of UP and LOW pulses of 28 and 4 祍
 */
#define PAL_LOW28   0b00
#define PAL_UP28    0b01
#define PAL_LOW4    0b10
#define PAL_UP4     0b11

/*
 * a vertical sync line is coded on one byte
 */
#define PAL_P1(x)   (x)
#define PAL_P2(x)   (x << 2)
#define PAL_P3(x)   (x << 4)
#define PAL_P4(x)   (x << 6)

/*
 * vertical sync lines codification
 */
#define PAL_L1      PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)
#define PAL_L2      PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)
#define PAL_L3      PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)
#define PAL_L4      PAL_P1(PAL_LOW28) | PAL_P2(PAL_UP4)  | PAL_P3(PAL_LOW28) | PAL_P4(PAL_UP4)
#define PAL_L5      PAL_P1(PAL_LOW28) | PAL_P2(PAL_UP4)  | PAL_P3(PAL_LOW28) | PAL_P4(PAL_UP4)
#define PAL_L6      PAL_P1(PAL_LOW28) | PAL_P2(PAL_UP4)  | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)
#define PAL_L7      PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)
#define PAL_L8      PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)

#define PAL_L311    PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)
#define PAL_L312    PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)
#define PAL_L313    PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW28) | PAL_P4(PAL_UP4)
#define PAL_L314    PAL_P1(PAL_LOW28) | PAL_P2(PAL_UP4)  | PAL_P3(PAL_LOW28) | PAL_P4(PAL_UP4)
#define PAL_L315    PAL_P1(PAL_LOW28) | PAL_P2(PAL_UP4)  | PAL_P3(PAL_LOW28) | PAL_P4(PAL_UP4)
#define PAL_L316    PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)
#define PAL_L317    PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP28) | PAL_P3(PAL_LOW4)  | PAL_P4(PAL_UP28)

/*
 * these info lines are not visible on screen
 */
#define PAL_LINFO   PAL_P1(PAL_LOW4)  | PAL_P2(PAL_UP4)  | PAL_P3(PAL_UP28)  | PAL_P4(PAL_UP28)

/*
 * this is the code of a visible video line
 */
#define PAL_LVIDEO  0

/*
 * now, the full table of a 625 lines frame
 * it does not start with first sync line for my own convenience (spares a test in ISR)
 */
const unsigned char   PAL_ltype[] =
        {
        PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO,
        PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO,

        PAL_LVIDEO, // 286 times

        // synchro 311 to 317
        PAL_L311, PAL_L312, PAL_L313, PAL_L314, PAL_L315, PAL_L316, PAL_L317,

        PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO,
        PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO, PAL_LINFO,

        PAL_LVIDEO, // 286 times

        // synchro 1 to 8
        PAL_L1, PAL_L2, PAL_L3, PAL_L4, PAL_L5, PAL_L6, PAL_L7, PAL_L8
        } ;

/***************
 * RAM variables
 ***************/
const   char    *PAL_linePtr = PAL_ltype ;      // pointer to the current line type
unsigned char   PAL_lineIdx = 0 ;               // index of the current line type
unsigned char   PAL_lineCode = 0 ;              // current line code
unsigned int    PAL_lineVideo = 0 ;             // current visible video line number
unsigned int    PAL_border = 0 ;                // border flag : 1=white border, 0=black border
unsigned char   PAL_y ;                         // number of vertical pixels
unsigned int    PAL_max_y ;                     // last video line number
unsigned char   PAL_shift_y ;                   // first video line number (vertical centering)
unsigned char   PAL_render ;                    // start rendering flag
unsigned long   PAL_frameCtr = 0 ;              // frame counter, 25 per second

/*****************
 * ROM tables
 *****************/
/*
 * TERMINAL fonts
 * 6x8 ASCII character table, starts from 0 (32 = space) up to 255
 *
 */
const unsigned char     PAL_charTable[] = {
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x3E, 0x5B, 0x4F, 0x5B, 0x3E, 0x00,
		0x3E, 0x6B, 0x4F, 0x6B, 0x3E, 0x00,
		0x1C, 0x3E, 0x7C, 0x3E, 0x1C, 0x00,
		0x18, 0x3C, 0x7E, 0x3C, 0x18, 0x00,
		0x1C, 0x57, 0x7D, 0x57, 0x1C, 0x00,
		0x1C, 0x5E, 0x7F, 0x5E, 0x1C, 0x00,
		0x00, 0x18, 0x3C, 0x18, 0x00, 0x00,
		0xFF, 0xE7, 0xC3, 0xE7, 0xFF, 0x00,
		0x00, 0x18, 0x24, 0x18, 0x00, 0x00,
		0xFF, 0xE7, 0xDB, 0xE7, 0xFF, 0x00,
		0x30, 0x48, 0x3A, 0x06, 0x0E, 0x00,
		0x26, 0x29, 0x79, 0x29, 0x26, 0x00,
		0x40, 0x7F, 0x05, 0x05, 0x07, 0x00,
		0x40, 0x7F, 0x05, 0x25, 0x3F, 0x00,
		0x5A, 0x3C, 0xE7, 0x3C, 0x5A, 0x00,
		0x7F, 0x3E, 0x1C, 0x1C, 0x08, 0x00,
		0x08, 0x1C, 0x1C, 0x3E, 0x7F, 0x00,
		0x14, 0x22, 0x7F, 0x22, 0x14, 0x00,
		0x5F, 0x5F, 0x00, 0x5F, 0x5F, 0x00,
		0x06, 0x09, 0x7F, 0x01, 0x7F, 0x00,
		0x00, 0x66, 0x89, 0x95, 0x6A, 0x00,
		0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
		0x94, 0xA2, 0xFF, 0xA2, 0x94, 0x00,
		0x08, 0x04, 0x7E, 0x04, 0x08, 0x00,
		0x10, 0x20, 0x7E, 0x20, 0x10, 0x00,
		0x08, 0x08, 0x2A, 0x1C, 0x08, 0x00,
		0x08, 0x1C, 0x2A, 0x08, 0x08, 0x00,
		0x1E, 0x10, 0x10, 0x10, 0x10, 0x00,
		0x0C, 0x1E, 0x0C, 0x1E, 0x0C, 0x00,
		0x30, 0x38, 0x3E, 0x38, 0x30, 0x00,
		0x06, 0x0E, 0x3E, 0x0E, 0x06, 0x00,
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x5F, 0x00, 0x00, 0x00,
		0x00, 0x07, 0x00, 0x07, 0x00, 0x00,
		0x14, 0x7F, 0x14, 0x7F, 0x14, 0x00,
		0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x00,
		0x23, 0x13, 0x08, 0x64, 0x62, 0x00,
		0x36, 0x49, 0x56, 0x20, 0x50, 0x00,
		0x00, 0x08, 0x07, 0x03, 0x00, 0x00,
		0x00, 0x1C, 0x22, 0x41, 0x00, 0x00,
		0x00, 0x41, 0x22, 0x1C, 0x00, 0x00,
		0x2A, 0x1C, 0x7F, 0x1C, 0x2A, 0x00,
		0x08, 0x08, 0x3E, 0x08, 0x08, 0x00,
		0x00, 0x80, 0x70, 0x30, 0x00, 0x00,
		0x08, 0x08, 0x08, 0x08, 0x08, 0x00,
		0x00, 0x00, 0x60, 0x60, 0x00, 0x00,
		0x20, 0x10, 0x08, 0x04, 0x02, 0x00,
		0x3E, 0x51, 0x49, 0x45, 0x3E, 0x00,
		0x00, 0x42, 0x7F, 0x40, 0x00, 0x00,
		0x72, 0x49, 0x49, 0x49, 0x46, 0x00,
		0x21, 0x41, 0x49, 0x4D, 0x33, 0x00,
		0x18, 0x14, 0x12, 0x7F, 0x10, 0x00,
		0x27, 0x45, 0x45, 0x45, 0x39, 0x00,
		0x3C, 0x4A, 0x49, 0x49, 0x31, 0x00,
		0x41, 0x21, 0x11, 0x09, 0x07, 0x00,
		0x36, 0x49, 0x49, 0x49, 0x36, 0x00,
		0x46, 0x49, 0x49, 0x29, 0x1E, 0x00,
		0x00, 0x00, 0x14, 0x00, 0x00, 0x00,
		0x00, 0x40, 0x34, 0x00, 0x00, 0x00,
		0x00, 0x08, 0x14, 0x22, 0x41, 0x00,
		0x14, 0x14, 0x14, 0x14, 0x14, 0x00,
		0x00, 0x41, 0x22, 0x14, 0x08, 0x00,
		0x02, 0x01, 0x59, 0x09, 0x06, 0x00,
		0x3E, 0x41, 0x5D, 0x59, 0x4E, 0x00,
		0x7C, 0x12, 0x11, 0x12, 0x7C, 0x00,
		0x7F, 0x49, 0x49, 0x49, 0x36, 0x00,
		0x3E, 0x41, 0x41, 0x41, 0x22, 0x00,
		0x7F, 0x41, 0x41, 0x41, 0x3E, 0x00,
		0x7F, 0x49, 0x49, 0x49, 0x41, 0x00,
		0x7F, 0x09, 0x09, 0x09, 0x01, 0x00,
		0x3E, 0x41, 0x41, 0x51, 0x73, 0x00,
		0x7F, 0x08, 0x08, 0x08, 0x7F, 0x00,
		0x00, 0x41, 0x7F, 0x41, 0x00, 0x00,
		0x20, 0x40, 0x41, 0x3F, 0x01, 0x00,
		0x7F, 0x08, 0x14, 0x22, 0x41, 0x00,
		0x7F, 0x40, 0x40, 0x40, 0x40, 0x00,
		0x7F, 0x02, 0x1C, 0x02, 0x7F, 0x00,
		0x7F, 0x04, 0x08, 0x10, 0x7F, 0x00,
		0x3E, 0x41, 0x41, 0x41, 0x3E, 0x00,
		0x7F, 0x09, 0x09, 0x09, 0x06, 0x00,
		0x3E, 0x41, 0x51, 0x21, 0x5E, 0x00,
		0x7F, 0x09, 0x19, 0x29, 0x46, 0x00,
		0x26, 0x49, 0x49, 0x49, 0x32, 0x00,
		0x03, 0x01, 0x7F, 0x01, 0x03, 0x00,
		0x3F, 0x40, 0x40, 0x40, 0x3F, 0x00,
		0x1F, 0x20, 0x40, 0x20, 0x1F, 0x00,
		0x3F, 0x40, 0x38, 0x40, 0x3F, 0x00,
		0x63, 0x14, 0x08, 0x14, 0x63, 0x00,
		0x03, 0x04, 0x78, 0x04, 0x03, 0x00,
		0x61, 0x59, 0x49, 0x4D, 0x43, 0x00,
		0x00, 0x7F, 0x41, 0x41, 0x41, 0x00,
		0x02, 0x04, 0x08, 0x10, 0x20, 0x00,
		0x00, 0x41, 0x41, 0x41, 0x7F, 0x00,
		0x04, 0x02, 0x01, 0x02, 0x04, 0x00,
		0x40, 0x40, 0x40, 0x40, 0x40, 0x00,
		0x00, 0x03, 0x07, 0x08, 0x00, 0x00,
		0x20, 0x54, 0x54, 0x78, 0x40, 0x00,
		0x7F, 0x28, 0x44, 0x44, 0x38, 0x00,
		0x38, 0x44, 0x44, 0x44, 0x28, 0x00,
		0x38, 0x44, 0x44, 0x28, 0x7F, 0x00,
		0x38, 0x54, 0x54, 0x54, 0x18, 0x00,
		0x00, 0x08, 0x7E, 0x09, 0x02, 0x00,
		0x18, 0xA4, 0xA4, 0x9C, 0x78, 0x00,
		0x7F, 0x08, 0x04, 0x04, 0x78, 0x00,
		0x00, 0x44, 0x7D, 0x40, 0x00, 0x00,
		0x20, 0x40, 0x40, 0x3D, 0x00, 0x00,
		0x7F, 0x10, 0x28, 0x44, 0x00, 0x00,
		0x00, 0x41, 0x7F, 0x40, 0x00, 0x00,
		0x7C, 0x04, 0x78, 0x04, 0x78, 0x00,
		0x7C, 0x08, 0x04, 0x04, 0x78, 0x00,
		0x38, 0x44, 0x44, 0x44, 0x38, 0x00,
		0xFC, 0x18, 0x24, 0x24, 0x18, 0x00,
		0x18, 0x24, 0x24, 0x18, 0xFC, 0x00,
		0x7C, 0x08, 0x04, 0x04, 0x08, 0x00,
		0x48, 0x54, 0x54, 0x54, 0x24, 0x00,
		0x04, 0x04, 0x3F, 0x44, 0x24, 0x00,
		0x3C, 0x40, 0x40, 0x20, 0x7C, 0x00,
		0x1C, 0x20, 0x40, 0x20, 0x1C, 0x00,
		0x3C, 0x40, 0x30, 0x40, 0x3C, 0x00,
		0x44, 0x28, 0x10, 0x28, 0x44, 0x00,
		0x4C, 0x90, 0x90, 0x90, 0x7C, 0x00,
		0x44, 0x64, 0x54, 0x4C, 0x44, 0x00,
		0x00, 0x08, 0x36, 0x41, 0x00, 0x00,
		0x00, 0x00, 0x77, 0x00, 0x00, 0x00,
		0x00, 0x41, 0x36, 0x08, 0x00, 0x00,
		0x02, 0x01, 0x02, 0x04, 0x02, 0x00,
		0x3C, 0x26, 0x23, 0x26, 0x3C, 0x00,
		0x1E, 0xA1, 0xA1, 0x61, 0x12, 0x00,
		0x3A, 0x40, 0x40, 0x20, 0x7A, 0x00,
		0x38, 0x54, 0x54, 0x55, 0x59, 0x00,
		0x21, 0x55, 0x55, 0x79, 0x41, 0x00,
		0x21, 0x54, 0x54, 0x78, 0x41, 0x00,
		0x21, 0x55, 0x54, 0x78, 0x40, 0x00,
		0x20, 0x54, 0x55, 0x79, 0x40, 0x00,
		0x0C, 0x1E, 0x52, 0x72, 0x12, 0x00,
		0x39, 0x55, 0x55, 0x55, 0x59, 0x00,
		0x39, 0x54, 0x54, 0x54, 0x59, 0x00,
		0x39, 0x55, 0x54, 0x54, 0x58, 0x00,
		0x00, 0x00, 0x45, 0x7C, 0x41, 0x00,
		0x00, 0x02, 0x45, 0x7D, 0x42, 0x00,
		0x00, 0x01, 0x45, 0x7C, 0x40, 0x00,
		0xF0, 0x29, 0x24, 0x29, 0xF0, 0x00,
		0xF0, 0x28, 0x25, 0x28, 0xF0, 0x00,
		0x7C, 0x54, 0x55, 0x45, 0x00, 0x00,
		0x20, 0x54, 0x54, 0x7C, 0x54, 0x44,
		0x7C, 0x0A, 0x09, 0x7F, 0x49, 0x41,
		0x32, 0x49, 0x49, 0x49, 0x32, 0x00,
		0x32, 0x48, 0x48, 0x48, 0x32, 0x00,
		0x32, 0x4A, 0x48, 0x48, 0x30, 0x00,
		0x3A, 0x41, 0x41, 0x21, 0x7A, 0x00,
		0x3A, 0x42, 0x40, 0x20, 0x78, 0x00,
		0x00, 0x9D, 0xA0, 0xA0, 0x7D, 0x00,
		0x39, 0x44, 0x44, 0x44, 0x39, 0x00,
		0x3D, 0x40, 0x40, 0x40, 0x3D, 0x00,
		0x3C, 0x24, 0xFF, 0x24, 0x24, 0x00,
		0x48, 0x7E, 0x49, 0x43, 0x66, 0x00,
		0x2B, 0x2F, 0xFC, 0x2F, 0x2B, 0x00,
		0xFF, 0x09, 0x29, 0xF6, 0x20, 0x00,
		0xC0, 0x88, 0x7E, 0x09, 0x03, 0x00,
		0x20, 0x54, 0x54, 0x79, 0x41, 0x00,