121 lines
2.9 KiB
Plaintext
121 lines
2.9 KiB
Plaintext
//TLC5940NT pin definitions
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#define VPRG 2
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#define SIN 11
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#define SCLK 13
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#define XLAT 4
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#define BLANK 5
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#define DCPRG 6
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#define GSCLK 7
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#define MISO 12
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#define SS 10
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int level[32] = {
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4095, 4095, 4095, 4095, 4095, 4095, 4095, 4095,4095, 4095, 4095, 4095,4095, 4095, 4095, 4095,
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4095, 4095, 4095, 4095, 4095, 4095, 4095, 4095,4095, 4095, 4095, 4095,4095, 4095, 4095, 4095};
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byte rele[6] = {14, 15, 16, 17, 18, 19};
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char spi_transfer(volatile byte data)
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{
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SPDR = data; // Start the transmission
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while (!(SPSR & (1<<SPIF))) // Wait the end of the transmission
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{
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};
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return SPDR; // return the received byte
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}
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void makemagic(){
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setGreys();
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feedPorts();
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}
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void feedPorts() {
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// Clock for TLC5940's PWM
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digitalWrite(BLANK, HIGH);
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digitalWrite(BLANK, LOW); //=all outputs ON, start PWM cycle
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for (int i=0; i<4096; i++) {
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pulseGSCLK();
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}
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}
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void pulseGSCLK() {
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//ultra fast pulse trick, using digitalWrite caused flickering
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PORTD |= 0x80 ; // bring pin 7 high, but don't touch any of the other pins in PORTB
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//16 nanosecs is the min pulse width for the 5940, but no pause seems needed here
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PORTD &= 0x7F; // bring pin 7 low without touching the other pins in PORTB
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}
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void setGreys() {
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digitalWrite(BLANK, HIGH);
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digitalWrite(XLAT,LOW);
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for(int i = 15; i>=0; i--){
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spi_transfer( (level[2*i+1] & 0x0FF0) >> 4 );
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spi_transfer( ((level[2*i+1] & 0xF) << 4) | ((level[2*i] & 0x0F00) >> 8) );
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spi_transfer( level[2*i] & 0xFF);
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}
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digitalWrite(XLAT,HIGH);
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digitalWrite(XLAT,LOW);
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digitalWrite(BLANK, LOW);
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}
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void startup(){
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for(byte x = 0; x < 31; ++x){
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level[x] = 0;
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makemagic();
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}
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}
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void setup() {
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pinMode(VPRG, OUTPUT);
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pinMode(SIN, OUTPUT);
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pinMode(SCLK, OUTPUT);
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pinMode(XLAT, OUTPUT);
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pinMode(BLANK, OUTPUT);
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pinMode(DCPRG, OUTPUT);
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pinMode(GSCLK, OUTPUT);
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pinMode(MISO, INPUT);
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pinMode(SS,OUTPUT);
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digitalWrite(SS,HIGH); //disable device
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digitalWrite(SIN, LOW);
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digitalWrite(SCLK, LOW);
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digitalWrite(XLAT, LOW);
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digitalWrite(VPRG, LOW);
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digitalWrite(BLANK, HIGH);
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digitalWrite(GSCLK, HIGH);
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digitalWrite(DCPRG, LOW); // USE EEPROM DC register if LOW
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//Setup the Hardware SPI registers
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// SPCR = 01010000
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//interrupt disabled,spi enabled,msb 1st,master,clk low when idle,
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//sample on leading edge of clk,system clock/4 (fastest)
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byte clr;
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SPCR = (1<<SPE)|(1<<MSTR);
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clr=SPSR;
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clr=SPDR;
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delay(10);
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for(byte i = 0; i < 6; ++i) pinMode(rele[i], OUTPUT);
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for(byte i = 0; i < 6; ++i) digitalWrite(rele[i], LOW);
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startup();
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}
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void loop() {
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for(byte i = 0; i < 32; ++i) level[i] = 4095;
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for(byte i = 0; i < 6; ++i) digitalWrite(rele[i], HIGH);
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makemagic();
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delay(1000);
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for(byte i = 0; i < 32; ++i) level[i] = 0;
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for(byte i = 0; i < 6; ++i) digitalWrite(rele[i], LOW);
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makemagic();
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delay(1000);
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}
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