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https://github.com/mcgurk/Arduino-USB-HID-RetroJoystickAdapter
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Create 4joy_adapter.ino
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Jarno Lehtinen
GitHub
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151
C64_4joy_adapter/4joy_adapter.ino
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151
C64_4joy_adapter/4joy_adapter.ino
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// Protovision 4 player interface / Classical Games adapter (1997)
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// Arduino Pro Micro
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// https://en.wikipedia.org/wiki/Commodore_64_joystick_adapters
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// https://www.protovision.games/hardw/build4player.php?language=en
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// http://cloud.cbm8bit.com/penfold42/joytester.zip
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// https://arduino.stackexchange.com/questions/8758/arduino-interruption-on-pin-change/8926
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// http://www.nongnu.org/avr-libc/user-manual/inline_asm.html
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// http://ww1.microchip.com/downloads/en/devicedoc/atmel-7766-8-bit-avr-atmega16u4-32u4_datasheet.pdf
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// http://ww1.microchip.com/downloads/en/devicedoc/atmel-0856-avr-instruction-set-manual.pdf
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// http://www.pighixxx.net/wp-content/uploads/2016/07/pro_micro_pinout_v1_0_red.png
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// https://opencircuit.shop/ProductInfo/1000378/ATmega32U4-Datasheet.pdf
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// https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Pro_Micro_v13b.pdf
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// TXD (INT3,PD3) and RXD (INT2,PD2) to userport L.
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// INT2(RXD) is used for rising edge and INT3(TXD) for falling edge.
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// Interrupts takes only less than 1us to change output port state after select-signal.
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// Joystick port 3
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// GND = GND (8)
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#define up1 (~PD & _BV(7)) // 6,PD7 = (1)
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#define down1 (~PC & _BV(6)) // 5,PC6 = (2)
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#define left1 (~PD & _BV(4)) // 4,PD4 = (3)
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#define right1 (~PD & _BV(0)) // 3,PD0 = (4)
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#define fire1 (~PD & _BV(1)) // 2,PD1 = (6)
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// Joystick port 4
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// GND = GND (8)
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#define up2 (~PF & _BV(7)) // A0,PF7 = (1)
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#define down2 (~PF & _BV(6)) // A1,PF6 = (2)
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#define left2 (~PF & _BV(5)) // A2,PF5 = (3)
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#define right2 (~PF & _BV(4)) // A3,PF4 = (4)
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#define fire2 (~PE & _BV(6)) // 7,PE6 = (6)
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// Arduino <-> Userport
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// VCC = +5V (2)
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// GND = GND (A)
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#define upC 1 // 15,PB1 = PB0 (C)
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#define downC 3 // 14,PB3 = PB1 (D)
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#define leftC 2 // 16,PB2 = PB2 (E)
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#define rightC 6 // 10,PB6 = PB3 (F)
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#define fire1C 4 // 8,PB4 = PB4 (H)
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#define fire2C 5 // 9,PB5 = PB5 (J)
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#define selectC (PIND & _BV(2)) // RXD,PD2(INT2)+TXD,PD3(INT3) = PB7 (L)
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// LEDS (inverted):
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// RX = D17,PB0
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// TX = -,PD5
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//volatile uint16_t last_interrupt;
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//volatile uint8_t *ptr;
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ISR(INT2_vect, ISR_NAKED) { // rising edge, output joystick 3
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asm volatile(
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" push r0 \n"
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" in r0, %[gpio] \n"
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" out %[pin], r0 \n"
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" pop r0 \n"
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" rjmp INT2_vect_part_2 \n" // go to part 2 for required prologue and epilogue
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:: [pin] "I" (_SFR_IO_ADDR(PORTB)), [gpio] "I" (_SFR_IO_ADDR(GPIOR0)));
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}
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ISR(INT2_vect_part_2) { GPIOR2 = &GPIOR0; }
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ISR(INT3_vect, ISR_NAKED) { // falling edge, output joystick 4
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asm volatile(
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" push r0 \n"
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// " lds r0, %[gpio] \n" // GPIOR1 address is 42
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" in r0, %[gpio] \n"
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" out %[pin], r0 \n"
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" pop r0 \n"
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" rjmp INT3_vect_part_2 \n" // go to part 2 for required prologue and epilogue
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:: [pin] "I" (_SFR_IO_ADDR(PORTB)), [gpio] "I" (_SFR_IO_ADDR(GPIOR1)));
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//:: [pin] "I" (_SFR_IO_ADDR(PORTB)), [gpio] "M" (_SFR_MEM_ADDR(GPIOR1)));
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}
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ISR(INT3_vect_part_2) { GPIOR2 = &GPIOR1; }
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void setup() {
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DDRB = 0xff; PORTB = 0xff; //all PB-ports are outputs and high (0xff = zero state, because signals are inverted)
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DDRF = 0; PORTF = 0xff; // all PF-ports are inputs with pullups
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DDRD = B00100000; PORTD = B11110011; // all PD-ports are inputs (except PD5) with pullups (PD2,PD3 without pullup)
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pinMode(5, INPUT_PULLUP); // pin5 (PC6) is input
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pinMode(7, INPUT_PULLUP); // pin7 (PE6) is input
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if (selectC) GPIOR2 = &GPIOR0; else GPIOR2 = &GPIOR1;
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GPIOR0 = 0xff; GPIOR1 = 0xff; // start from zero state (signals are inverted)
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TIMSK0 = 0; // disable timer0 interrupts (Arduino Uno/Pro Micro millis()/micros() update ISR)
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EICRA = B10110000; // INT2 – rising edge on RXD (Bxx11xxxx), INT3 - falling edge on TXD (B10xxxxxx)
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EIMSK = B1100; // enable INT2 (Bx1xx) and INT3 (B1xxx)
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//Serial.begin(115200);
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//PORTD &= ~_BV(5); // TX-LED on
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// We can't use millis() or micros() because Timer0 interrupts are disabled. We use 16-bit Timer1 with 1024 prescaler as "clock".
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/*TIMSK1 = 0; // disable timer1 interrupts
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TCCR1A = 0;
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TCCR1B = B00000101; // Timer1, normal mode, prescaler 1024. One tick is 64us.
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TCNT1 = 0; // reset Timer1 counter*/
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}
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void loop() {
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uint8_t PF, PD, PC, PE;
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PF = PINF; PD = PIND; PC = PINC; PE = PINE;
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uint8_t joy1 = 0xff; uint8_t joy2 = 0xff; // all signals are inverted
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if (up1) bitClear(joy1,upC);
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if (down1) bitClear(joy1,downC);
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if (left1) bitClear(joy1,leftC);
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if (right1) bitClear(joy1,rightC);
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if (up2) bitClear(joy2,upC);
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if (down2) bitClear(joy2,downC);
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if (left2) bitClear(joy2,leftC);
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if (right2) bitClear(joy2,rightC);
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if (fire1) { bitClear(joy1,fire1C); bitClear(joy2,fire1C); }
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if (fire2) { bitClear(joy1,fire2C); bitClear(joy2,fire2C); }
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if (GPIOR2 == &GPIOR0) { PORTD &= ~_BV(5); } else { PORTD |= _BV(5); } //TX-LED on, if joystick 3 is activated
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if (GPIOR2 == &GPIOR1) { bitClear(joy2,0); } //RX-LED on, if joystick 4 is activated
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GPIOR0 = joy1; GPIOR1 = joy2;
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//PORTB = *ptr; // is this atomic? probably, because ptr is 6-bit pointer. nope...
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noInterrupts();
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PORTB = *((unsigned int *)GPIOR2);
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//ec8: eb b5 in r30, 0x2b ; 43
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//eca: f0 e0 ldi r31, 0x00 ; 0
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//ecc: 80 81 ld r24, Z
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//ece: 85 b9 out 0x05, r24 ; 5
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interrupts();
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/*asm volatile(
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" clr r31 \n" //Z is r31:r30. Z is pointer.
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" cli \n"
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" lds r30, %[gpio] \n"
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" ld __tmp_reg__, Z \n"
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" sts %[pin], __tmp_reg__ \n"
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" sei \n"
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:: [pin] "M" (_SFR_MEM_ADDR(PORTB)), [gpio] "M" (_SFR_MEM_ADDR(GPIOR2)) : "r30", "r31");*/
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//ed2: ff 27 eor r31, r31
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//ed4: f8 94 cli
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//ed6: e0 91 4b 00 lds r30, 0x004B ; 0x80004b <__TEXT_REGION_LENGTH__+0x7e004b>
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//eda: 00 80 ld r0, Z
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//edc: 00 92 25 00 sts 0x0025, r0 ; 0x800025 <__TEXT_REGION_LENGTH__+0x7e0025>
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//ee0: 78 94 sei
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//delayMicroseconds(10);
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//uint16_t koe = ptr;
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//Serial.println(koe, HEX);
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//delayMicroseconds(10000);
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}
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