42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
/**
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* Composite pal adapter test.
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* This sketch makes an Arduino send test data to tha Pat80 composite video pal adapter.
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* Connect the video adapter directly to Arduino
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*/
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const byte CLK = 11; // output active low
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const byte RS = 12; // output low = DATA register, high = COMMAND register
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const byte BUSY = 13; // Input, Active low
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// DATA BUS (Output, active high): 3, 4, 5, 6, 7, 8, 9, 10;
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void setup() {
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DDRD = DDRD | B11111000; // Port D (arduino pins 3 to 7) is output. In or to preserve serial pins and interrupt pin
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DDRB = B00000111; // Port B (0,1,2) = pins 8,9,10 output
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pinMode(CLK, OUTPUT);
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pinMode(RS, OUTPUT);
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pinMode(BUSY, INPUT);
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digitalWrite(CLK, HIGH); // Inactive clock
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}
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void loop() {
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delay(1000);
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send();
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}
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void send() {
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// Random char
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char c = random(32, 126);
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// Wait for BUSY to become inactive (HIGH)
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//while(digitalRead(BUSY) == LOW) {}
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// Split byte to two parts and write to ports
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PORTD = c << 3;
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PORTB = c >> 5;
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// Clock pulse
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digitalWrite(CLK, LOW);
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delay(100);
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digitalWrite(CLK, HIGH);
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}
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