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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 944 | - | 1 | // ******************************************************** |
| 2 | // ** Spektrum DX8 Expander for 12 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 | #include <util/delay.h> |
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| 18 | |||
| 19 | #define TX_High PORTA |= 1 << PORTA0 // Set TX-Pin High |
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| 20 | #define TX_Low PORTA &= ~(1 << PORTA0) // Set TX-Pin Low |
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| 21 | #define SYNC_High PORTA |= 1 << PORTA1 // Set Sync-Pin High |
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| 22 | #define SYNC_Low PORTA &= ~(1 << PORTA1) // Set Sync-Pin Low |
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| 23 | |||
| 24 | |||
| 25 | |||
| 26 | void Send(char sync, char data) |
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| 27 | { |
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| 28 | unsigned char synced; |
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| 29 | |||
| 30 | if (sync == 0) SYNC_High; else SYNC_Low; // Send Sync |
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| 31 | if (data == 0) TX_High; else TX_Low; // Send Data |
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| 32 | |||
| 33 | synced = 0; |
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| 34 | while (synced == 0) |
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| 35 | { |
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| 36 | while ( PIND & (1<<PD5) ); // Wait for DX8-Sync goes low |
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| 37 | while ( !(PIND & (1<<PD5)) ); // Wait for DX8-Sync goes high |
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| 38 | _delay_us(4500); |
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| 39 | if ((PIND & (1<<PD5))) synced = 1; // When its high (again) after 4,5ms, we are synced |
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| 40 | } |
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| 41 | |||
| 42 | |||
| 43 | } |
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| 44 | |||
| 45 | |||
| 46 | |||
| 47 | int main(void) |
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| 48 | { |
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| 49 | char i,Parity; // Bit-Counter and Parity Bit |
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| 50 | DDRA = 0b011; // PORT A INPUT: RESET; OUTPUT: Sync+Data |
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| 51 | DDRB = 0b00000000; // PORT B INPUT: Jumper for Bypass |
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| 52 | DDRD = 0b0000000; // PORT D INPUT: Switches + DX7-Sync |
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| 53 | PORTA = 0b111; // Pull-Up for /RESET, High for Sync+Data |
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| 54 | PORTB = 0b01000000; // Pull-Up for Jumper |
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| 55 | PORTD = 0b1011111; // Pull-Up for Switches |
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| 56 | |||
| 57 | while(1) // Main-Loop (Sending data all the time) |
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| 58 | { |
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| 59 | if (!(PINB & (1<<PINB6))) // By-Pass Mode |
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| 60 | { |
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| 61 | if (PIND & (1<<PIND0)) PORTA |= 1 << PORTA1; // A1=D0 |
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| 62 | else PORTA &= ~(1 << PORTA1); |
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| 63 | |||
| 64 | if (PIND & (1<<PIND1)) PORTA |= 1 << PORTA0; // A0=D1 |
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| 65 | else PORTA &= ~(1 << PORTA0); |
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| 66 | } |
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| 67 | else // Normal Mode |
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| 68 | { |
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| 69 | Parity = 0; // Reset Parity Bit |
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| 70 | Send(1,0); // Send SYNC Pulse |
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| 71 | |||
| 72 | i=0; |
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| 73 | while (i<7) // Encode PD0-PD4 + PD6 (F-MODE(2), ELEV(1), MIX, GEAR, ELEV(2)) |
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| 74 | { |
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| 75 | if (PIND & (1<<i)) // Check Pin #i |
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| 76 | { |
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| 77 | Send(0,0); // When High, Send Low (Switched to "0") |
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| 78 | Parity = ~Parity; // and invert Parity Bit |
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| 79 | } |
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| 80 | else Send(0,1); // When Low, Send High (Switched to "1") |
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| 81 | i++; |
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| 82 | if (i == 5) i = 6; // Skip PD5 |
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| 83 | } |
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| 84 | |||
| 85 | for (i=0;i<2;i++) // Encode PB0+PB1 (AIL D/R (2)) |
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| 86 | { |
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| 87 | if ((PINB & (1<<i))) // Check Pin #i |
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| 88 | { |
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| 89 | Send(0,0); // When High, Send Low (Switched to "0") |
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| 90 | Parity = ~Parity; // and invert Parity Bit |
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| 91 | } |
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| 92 | else Send(0,1); // When Low, Send High (Switched to "1") |
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| 93 | } |
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| 94 | |||
| 95 | Send(0,Parity); // Send Parity Bit |
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| 96 | } |
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| 97 | } |
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| 98 | } |