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Max7456.ino
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Max7456.ino
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#define DATAOUT 11 // MOSI
#define DATAIN 12 // MISO
#define SPICLOCK 13 // sck
#define VSYNC 2 // INT0
#ifndef WHITEBRIGHTNESS
#define WHITEBRIGHTNESS 0x01
#endif
#ifndef BLACKBRIGHTNESS
#define BLACKBRIGHTNESS 0x00
#endif
#define BWBRIGHTNESS ((BLACKBRIGHTNESS << 2) | WHITEBRIGHTNESS)
//MAX7456 opcodes
#define DMM_reg 0x04
#define DMAH_reg 0x05
#define DMAL_reg 0x06
#define DMDI_reg 0x07
#define VM0_reg 0x00
#define VM1_reg 0x01
// video mode register 0 bits
#define VIDEO_BUFFER_DISABLE 0x01
//#define MAX7456_RESET 0x02
#define VERTICAL_SYNC_NEXT_VSYNC 0x04
#define OSD_ENABLE 0x08
#define SYNC_MODE_AUTO 0x00
#define SYNC_MODE_INTERNAL 0x30
#define SYNC_MODE_EXTERNAL 0x20
#define VIDEO_MODE_PAL 0x40
#define VIDEO_MODE_NTSC 0x00
// video mode register 1 bits
// duty cycle is on_off
#define BLINK_DUTY_CYCLE_50_50 0x00
#define BLINK_DUTY_CYCLE_33_66 0x01
#define BLINK_DUTY_CYCLE_25_75 0x02
#define BLINK_DUTY_CYCLE_75_25 0x03
// blinking time
#define BLINK_TIME_0 0x00
#define BLINK_TIME_1 0x04
#define BLINK_TIME_2 0x08
#define BLINK_TIME_3 0x0C
// background mode brightness (percent)
#define BACKGROUND_BRIGHTNESS_0 0x00
#define BACKGROUND_BRIGHTNESS_7 0x01
#define BACKGROUND_BRIGHTNESS_14 0x02
#define BACKGROUND_BRIGHTNESS_21 0x03
#define BACKGROUND_BRIGHTNESS_28 0x04
#define BACKGROUND_BRIGHTNESS_35 0x05
#define BACKGROUND_BRIGHTNESS_42 0x06
#define BACKGROUND_BRIGHTNESS_49 0x07
#define BACKGROUND_MODE_GRAY 0x40
//MAX7456 commands
#define CLEAR_display 0x04
#define CLEAR_display_vert 0x06
#define END_string 0xff
#define MAX7456ADD_VM0 0x00 //0b0011100// 00 // 00 ,0011100
#define MAX7456ADD_VM1 0x01
#define MAX7456ADD_HOS 0x02
#define MAX7456ADD_VOS 0x03
#define MAX7456ADD_DMM 0x04
#define MAX7456ADD_DMAH 0x05
#define MAX7456ADD_DMAL 0x06
#define MAX7456ADD_DMDI 0x07
#define MAX7456ADD_CMM 0x08
#define MAX7456ADD_CMAH 0x09
#define MAX7456ADD_CMAL 0x0a
#define MAX7456ADD_CMDI 0x0b
#define MAX7456ADD_OSDM 0x0c
#define MAX7456ADD_RB0 0x10
#define MAX7456ADD_RB1 0x11
#define MAX7456ADD_RB2 0x12
#define MAX7456ADD_RB3 0x13
#define MAX7456ADD_RB4 0x14
#define MAX7456ADD_RB5 0x15
#define MAX7456ADD_RB6 0x16
#define MAX7456ADD_RB7 0x17
#define MAX7456ADD_RB8 0x18
#define MAX7456ADD_RB9 0x19
#define MAX7456ADD_RB10 0x1a
#define MAX7456ADD_RB11 0x1b
#define MAX7456ADD_RB12 0x1c
#define MAX7456ADD_RB13 0x1d
#define MAX7456ADD_RB14 0x1e
#define MAX7456ADD_RB15 0x1f
#define MAX7456ADD_OSDBL 0x6c
#define MAX7456ADD_STAT 0xA0
// Selectable by video mode
//uint8_t ENABLE_display;
//uint8_t ENABLE_display_vert;
//uint8_t DISABLE_display;
uint16_t MAX_screen_size;
//////////////////////////////////////////////////////////////
uint8_t spi_transfer(uint8_t data)
{
SPDR = data; // Start the transmission
while (!(SPSR & (1<<SPIF))) // Wait the end of the transmission
;
return SPDR; // return the received byte
}
// ============================================================ WRITE TO SCREEN
void MAX7456Setup(void)
{
uint8_t MAX7456_reset=0x02;
uint8_t MAX_screen_rows;
pinMode(MAX7456RESET,OUTPUT);
digitalWrite(MAX7456RESET,LOW); //force reset
delay(100);
digitalWrite(MAX7456RESET,HIGH); //hard enable
delay(100);
pinMode(MAX7456SELECT,OUTPUT);
digitalWrite(MAX7456SELECT,HIGH); //disable device
pinMode(DATAOUT, OUTPUT);
pinMode(DATAIN, INPUT);
pinMode(SPICLOCK,OUTPUT);
pinMode(VSYNC, INPUT);
// SPCR = 01010000
//interrupt disabled,spi enabled,msb 1st,master,clk low when idle,
//sample on leading edge of clk,system clock/4 rate (4 meg)
SPCR = (1<<SPE)|(1<<MSTR);
SPSR = (1<<SPI2X);
uint8_t spi_junk;
spi_junk=SPSR;
spi_junk=SPDR;
delay(100);
// force soft reset on Max7456
digitalWrite(MAX7456SELECT,LOW);
MAX7456_Send(VM0_reg, MAX7456_reset);
delay(100);
#ifdef AUTOCAM
pinMode(MAX7456SELECT,OUTPUT);
digitalWrite(MAX7456SELECT,LOW);
uint8_t srdata = 0;
#if defined AUTOCAMWAIT
while ((B00000011 & srdata) == 0){
spi_transfer(0xa0);
srdata = spi_transfer(0xFF);
delay(100);
}
#else
spi_transfer(0xa0);
srdata = spi_transfer(0xFF);
#endif //AUTOCAMWAIT
if ((B00000001 & srdata) == B00000001){ //PAL
Settings[S_VIDEOSIGNALTYPE]=1;
}
else if((B00000010 & srdata) == B00000010){ //NTSC
Settings[S_VIDEOSIGNALTYPE]=0;
}
#endif //AUTOCAM
#ifdef FASTPIXEL
// force fast pixel timing
MAX7456_Send(MAX7456ADD_OSDM, 0x00);
// MAX7456_Send(MAX7456ADD_OSDM, 0xEC);
// uint8_t srdata = spi_transfer(0xFF); //get data byte
// srdata = srdata & 0xEF;
// MAX7456_Send(0x6c, srdata);
delay(100);
#endif
if(Settings[S_VIDEOSIGNALTYPE]) { // PAL
MAX7456_reset = 0x42;
MAX_screen_size = 480;
MAX_screen_rows = 16;
}
else { // NTSC
MAX7456_reset = 0x02;
MAX_screen_size = 390;
MAX_screen_rows = 13;
}
// set all rows to same charactor black/white level
uint8_t x;
for(x = 0; x < MAX_screen_rows; x++) {
MAX7456_Send(MAX7456ADD_RB0+x, BWBRIGHTNESS);
}
// make sure the Max7456 is enabled
spi_transfer(VM0_reg);
if (Settings[S_VIDEOSIGNALTYPE]){
spi_transfer(OSD_ENABLE|VIDEO_MODE_PAL);
}
else{
spi_transfer(OSD_ENABLE|VIDEO_MODE_NTSC);
}
digitalWrite(MAX7456SELECT,HIGH);
delay(100);
# ifdef USE_VSYNC
EIMSK |= (1 << INT0); // enable interuppt
EICRA |= (1 << ISC01); // interrupt at the falling edge
sei();
#endif
}
// Copy string from ram into screen buffer
void MAX7456_WriteString(const char *string, int Adresse)
{
uint8_t xx;
for(xx=0;string[xx]!=0;)
{
screen[Adresse++] = string[xx++];
}
}
// Copy string from progmem into the screen buffer
void MAX7456_WriteString_P(const char *string, int Adresse)
{
uint8_t xx = 0;
char c;
while((c = (char)pgm_read_byte(&string[xx++])) != 0)
{
screen[Adresse++] = c;
}
}
#ifdef USE_VSYNC
volatile unsigned char vsync_wait = 0;
ISR(INT0_vect) {
vsync_wait = 0;
}
#endif
void MAX7456_DrawScreen()
{
uint16_t xx;
#ifdef USE_VSYNC
digitalWrite(MAX7456SELECT,LOW);
spi_transfer(DMM_reg);
spi_transfer(1);
spi_transfer(DMAH_reg);
spi_transfer(0);
spi_transfer(DMAL_reg);
spi_transfer(0);
vsync_wait = 1;
uint32_t vsynctimer=40+millis();
#endif
digitalWrite(MAX7456SELECT,LOW);
for(xx=0;xx<MAX_screen_size;++xx){
#ifdef USE_VSYNC
SPDR = MAX7456ADD_DMDI;
if (xx==240) {
vsynctimer=40+millis();
vsync_wait = 1; // Not enough time to load all characters within VBI period. This splits and waits until next field
}
while (!(SPSR & (1<<SPIF))); // Wait the end of the last SPI transmission is clear
while (vsync_wait){
if (millis()>vsynctimer){
vsync_wait=0;
}
else{
serialMSPreceive(0); // Might as well do something whilst waiting :)
}
}
SPDR = screen[xx];
screen[xx] = ' ';
while (!(SPSR & (1<<SPIF))); // Wait the end of the last SPI transmission is clear
#else
MAX7456_Send(MAX7456ADD_DMAH, xx>>8);
MAX7456_Send(MAX7456ADD_DMAL, xx);
MAX7456_Send(MAX7456ADD_DMDI, screen[xx]);
screen[xx] = ' ';
#endif
}
#ifdef USE_VSYNC
spi_transfer(DMDI_reg);
spi_transfer(END_string);
spi_transfer(DMM_reg);
spi_transfer(B00000000);
#endif
digitalWrite(MAX7456SELECT,HIGH);
}
void MAX7456_Send(uint8_t add, uint8_t data)
{
spi_transfer(add);
spi_transfer(data);
}
//MAX7456 commands
#define WRITE_TO_MAX7456
#define NVM_ram_size 54
#define CLEAR_display 0x04
#define CLEAR_display_vert 0x06
#define END_string 0xff
#define WRITE_nvr 0xa0
// with NTSC
#define ENABLE_display 0x08
#define ENABLE_display_vert 0x0c
#define MAX7456_reset 0x02
#define DISABLE_display 0x00
#define STATUS_reg_nvr_busy 0x20
void write_NVM(uint8_t char_address)
{
#ifdef WRITE_TO_MAX7456
// disable display
digitalWrite(MAX7456SELECT,LOW);
spi_transfer(VM0_reg);
//spi_transfer(DISABLE_display);
//digitalWrite(MAX7456SELECT,LOW);
//spi_transfer(VM0_reg);
spi_transfer(Settings[S_VIDEOSIGNALTYPE]?0x40:0);
spi_transfer(MAX7456ADD_CMAH); // set start address high
spi_transfer(char_address);
for(uint8_t x = 0; x < NVM_ram_size; x++) // write out 54 bytes of character to shadow ram
{
spi_transfer(MAX7456ADD_CMAL); // set start address low
spi_transfer(x);
spi_transfer(MAX7456ADD_CMDI);
spi_transfer(fontData[x]);
}
// transfer 54 bytes from shadow ram to NVM
spi_transfer(MAX7456ADD_CMM);
spi_transfer(WRITE_nvr);
// wait until bit 5 in the status register returns to 0 (12ms)
while ((spi_transfer(MAX7456ADD_STAT) & STATUS_reg_nvr_busy) != 0x00);
spi_transfer(VM0_reg); // turn on screen next vertical
//spi_transfer(ENABLE_display_vert);
spi_transfer(Settings[S_VIDEOSIGNALTYPE]?0x4c:0x0c);
digitalWrite(MAX7456SELECT,HIGH);
#else
delay(12);
#endif
}
void MAX7456Stalldetect(void){
uint8_t srdata;
pinMode(MAX7456SELECT,OUTPUT);
digitalWrite(MAX7456SELECT,LOW);
spi_transfer(0x80);
srdata = spi_transfer(0xFF);
digitalWrite(MAX7456SELECT,HIGH);
if ((B00001000 & srdata) == 0)
MAX7456Setup();
}
#if defined LOADFONT_DEFAULT || defined LOADFONT_LARGE || defined LOADFONT_BOLD
void displayFont()
{
for(uint8_t x = 0; x < 255; x++) {
screen[90+x] = x;
}
}
void updateFont()
{
for(uint8_t x = 0; x < 255; x++){
for(uint8_t i = 0; i < 54; i++){
fontData[i] = (uint8_t)pgm_read_byte(fontdata+(64*x)+i);
}
write_NVM(x);
ledstatus=!ledstatus;
if (ledstatus==true){
digitalWrite(LEDPIN,HIGH);
}
else{
digitalWrite(LEDPIN,LOW);
}
delay(20); // Shouldn't be needed due to status reg wait.
}
}
#endif