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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 535 | form | 1 | // ******************************************************** |
| 2 | // ** Spektrum DX7(se) Expander for 10 Channels at large ** |
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| 3 | // ******************************************************** |
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| 4 | // ** Target: Atmel ATtiny2313 with delivered standard ** |
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| 5 | // ** Fuses (internal RC-Oscillator @ 1 MHz) ** |
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| 6 | // ******************************************************** |
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| 7 | // ** It sends data from 4 additionally switches over ** |
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| 8 | // ** the tripole "FLAP" channel which the FlightControl ** |
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| 9 | // ** can decode "on the fly" :) ** |
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| 10 | // ******************************************************** |
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| 11 | // ** (c) 2009-0xFFFF Stefan Pendsa ** |
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| 12 | // ** License: don't know - use it and have fun ** |
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| 13 | // ******************************************************** |
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| 14 | |||
| 15 | |||
| 16 | #include <avr/io.h> |
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| 17 | |||
| 18 | #define TX_High PORTA |= 1 << PORTA0 // Set TX-Pin High |
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| 19 | #define TX_Low PORTA &= ~(1 << PORTA0) // Set TX-Pin Low |
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| 20 | #define SYNC_High PORTA |= 1 << PORTA1 // Set Sync-Pin High |
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| 21 | #define SYNC_Low PORTA &= ~(1 << PORTA1) // Set Sync-Pin Low |
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| 22 | |||
| 23 | |||
| 24 | |||
| 25 | void Send(char sync, char data) |
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| 26 | { |
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| 27 | if (sync == 0) SYNC_High; else SYNC_Low; // Send Sync |
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| 28 | if (data == 0) TX_High; else TX_Low; // Send Data |
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| 541 | form | 29 | while ( PIND & (1<<PD5) ); // Wait for DX7-Sync goes low |
| 30 | while ( !(PIND & (1 << PD5)) ); // Wait for DX7-Sync goes high |
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| 31 | } |
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| 535 | form | 32 | |
| 33 | |||
| 34 | |||
| 35 | int main(void) |
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| 36 | { |
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| 37 | char i,Parity; // Bit-Counter and Parity Bit |
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| 743 | form | 38 | unsigned int timer=0; // Timer for Battery-Remember-Beeping |
| 723 | form | 39 | DDRA = 0b011; // PORT A INPUT: RESET; OUTPUT: Sync+Data |
| 40 | DDRB = 0b00000000; // PORT B INPUT: Jumper for Bypass |
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| 541 | form | 41 | DDRD = 0b0000000; // PORT D INPUT: Switches + DX7-Sync |
| 723 | form | 42 | PORTA = 0b111; // Pull-Up for /RESET, High for Sync+Data |
| 43 | PORTB = 0b01000000; // Pull-Up for Jumper |
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| 541 | form | 44 | PORTD = 0b0011111; // Pull-Up for Switches |
| 535 | form | 45 | |
| 46 | while(1) // Main-Loop (Sending data all the time) |
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| 47 | { |
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| 723 | form | 48 | if (!(PINB & (1<<PINB6))) // By-Pass Mode |
| 49 | { |
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| 50 | if (PIND & (1<<PIND0)) PORTA |= 1 << PORTA1; // A1=D0 |
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| 51 | else PORTA &= ~(1 << PORTA1); |
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| 535 | form | 52 | |
| 723 | form | 53 | if (PIND & (1<<PIND1)) PORTA |= 1 << PORTA0; // A0=D1 |
| 54 | else PORTA &= ~(1 << PORTA0); |
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| 55 | } |
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| 56 | else // Normal Mode |
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| 535 | form | 57 | { |
| 723 | form | 58 | Parity = 0; // Reset Parity Bit |
| 59 | Send(1,0); // Send SYNC Pulse |
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| 60 | |||
| 61 | for (i=0;i<5;i++) // Encode the first five Port Pins |
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| 535 | form | 62 | { |
| 723 | form | 63 | if (PIND & (1<<i)) // Check Pin #i |
| 64 | { |
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| 65 | Send(0,0); // When High, Send Low (Switched to "0") |
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| 66 | Parity = ~Parity; // and invert Parity Bit |
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| 67 | } |
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| 68 | else |
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| 69 | { |
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| 70 | Send(0,1); // When Low, Send High (Switched to "1") |
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| 71 | } |
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| 535 | form | 72 | } |
| 723 | form | 73 | |
| 74 | Send(0,Parity); // Send Parity Bit |
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| 743 | form | 75 | |
| 76 | timer++; // Timer increase for Battery-Remember-Beeping |
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| 77 | if (timer == 6000) DDRB = 0b00000001; // 15 min 0.00 sec -> PB0 to GND |
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| 78 | if (timer == 6001) DDRB = 0b00000000; // 15 min 0.15 sec -> PB0 input again |
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| 79 | if (timer == 6002) DDRB = 0b00000010; // 15 min 0.30 sec -> PB1 to GND |
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| 80 | if (timer == 6003) DDRB = 0b00000000; // 15 min 0.45 sec -> PB1 input again |
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| 81 | if (timer == 6004) timer = 0; // 15 min 0.60 sec -> Timer reset (half delays on DX7se) |
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| 535 | form | 82 | } |
| 83 | } |
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| 84 | } |