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| /** | |
| * Z1FFER v0.3.X Firmware. | |
| * | |
| * This code is designed to be as fast as possible. | |
| * It operates two inverted clock signals on pins 9 and 10 | |
| * while reading in random bytes on pins 6 and 7. | |
| * Pins are read and written to using the registers for speed. | |
| * The clock signal is irregular but this does not effect the | |
| * performance of the ZIFFER shield. | |
| */ | |
| bool flip = false; | |
| void setup() { | |
| //Set B pins to output | |
| DDRB = 0b11111111; | |
| //Set D pins to input | |
| DDRD = 0x00; | |
| //Baud rate of 2000000 is around the theoretical maximum of an Ardunio Uno r3 | |
| Serial.begin(2000000); | |
| } | |
| int currentByte = 0; | |
| int i=0; | |
| void loop() { | |
| currentByte = 0; | |
| for (i=0; i < 8; i += 2) { | |
| runClockSignals(); | |
| runClockSignals(); | |
| byte pinVal = (PIND >> 6) & B00000011; | |
| currentByte |= pinVal << i; | |
| } | |
| Serial.write(currentByte); | |
| } | |
| void runClockSignals(){ | |
| if (flip) { | |
| PORTB = 0b00000010; | |
| } | |
| else { | |
| PORTB = 0b00000100; | |
| } | |
| flip = !flip; | |
| } |
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