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Arduino-USB-HID-RetroJoystickAdapter
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Update 4joy_adapter.ino

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Jarno Lehtinen 2018-12-07 11:52:43 +02:00 committed by GitHub
parent 760d2678b8
commit 1b4a1d08ce
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1 changed files with 35 additions and 20 deletions
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55
C64_4joy_adapter/4joy_adapter.ino
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@ -5,10 +5,12 @@
// http://cloud.cbm8bit.com/penfold42/joytester.zip
// https://arduino.stackexchange.com/questions/8758/arduino-interruption-on-pin-change/8926
// http://www.pighixxx.net/wp-content/uploads/2016/07/pro_micro_pinout_v1_0_red.png
// https://opencircuit.shop/ProductInfo/1000378/ATmega32U4-Datasheet.pdf
// https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Pro_Micro_v13b.pdf
// TXD (INT3,PD3) and RXD (INT2,PD2) to userport L
// INT2(RXD) is used for rising edge and INT3(TXD) for falling edge
// TXD (INT3,PD3) and RXD (INT2,PD2) to userport L.
// INT2(RXD) is used for rising edge and INT3(TXD) for falling edge.
// Interrupts takes only less than 1us to change output port state after select-signal.
// Joystick port 3
// GND = GND (8)
@ -31,18 +33,23 @@
// GND = GND (A)
// TXD+RXD = Select = PB7 (L)
#define upC 1 // 15,PB1 = PB0 (C)
#define downC 3 // 14,PB3 = PB1(D)
#define downC 3 // 14,PB3 = PB1 (D)
#define leftC 2 // 16,PB2 = PB2 (E)
#define rightC 6 // 10,PB6 = PB3 (F)
#define fire1C 4 // 8,PB4 = PB4 (H)
#define fire2C 5 // 9,PB5 = PB5 (J)
// LEDS:
// RX = D17,PB0
// TX = -,PD5
volatile uint8_t output1;
volatile uint8_t output2;
volatile uint16_t last_interrupt;
volatile uint8_t mode = 0; // 0 = 3-joystick mode, 1 = 4-joystick mode
volatile uint8_t last_joystick = 1;
ISR(INT2_vect, ISR_NAKED) {
ISR(INT2_vect, ISR_NAKED) { // rising edge, output joystick 3
asm volatile(
" push r0 \n" // save register r0
" lds r0, output1 \n"
@ -52,9 +59,9 @@ ISR(INT2_vect, ISR_NAKED) {
:: [pin] "I" (_SFR_IO_ADDR(PORTB)));
}
ISR(INT2_vect_part_2) { mode = 1; last_interrupt = TCNT1; }
ISR(INT2_vect_part_2) { mode = 1; last_joystick = 1; last_interrupt = TCNT1; }
ISR(INT3_vect, ISR_NAKED) {
ISR(INT3_vect, ISR_NAKED) { // falling edge, output joystick 4
asm volatile(
" push r0 \n" // save register r0
" lds r0, output2 \n"
@ -64,32 +71,36 @@ ISR(INT3_vect, ISR_NAKED) {
:: [pin] "I" (_SFR_IO_ADDR(PORTB)));
}
ISR(INT3_vect_part_2) { mode = 1; last_interrupt = TCNT1; }
ISR(INT3_vect_part_2) { mode = 1; last_joystick = 2; last_interrupt = TCNT1; }
void setup() {
pinMode(5, INPUT_PULLUP); // pin5 (PC6) is input
pinMode(7, INPUT_PULLUP); // pin7 (PE6) is input
DDRB = 0xff; //all PB-ports are outputs
DDRF = 0; PORTF = 0xff; // all PF-ports are inputs with pullups
DDRD = 0; PORTD = B11010011; // all PD-ports are inputs with pullups (PD2,PD3,PD5 without pullup)
DDRD = B00100000; PORTD = B11110011; // all PD-ports are inputs (except PD5) with pullups (PD2,PD3 without pullup)
TIMSK0 = 0; // disable timer0 interrupts (Arduino Uno/Pro Micro millis()/micros() update ISR)
TIMSK0 = 0; // disable timer0 interrupts (Arduino Uno/Pro Micro millis() update ISR)
EICRA = B10110000; // INT2 – rising edge on RXD (Bxx11xxxx), INT3 - falling edge on TXD (B10xxxxxx)
EIMSK = B1100; // enable int2 (Bx1xx) and int3 (B1xxx)
EIMSK = B1100; // enable INT2 (Bx1xx) and INT3 (B1xxx)
//Serial.begin(115200);
//PORTD &= ~_BV(5);
// We can't use millis() or micros() because Timer0 interrupts are disabled. We use 16-bit Timer1 with 1024 prescaler as "clock".
TIMSK1 = 0; // disable timer1 interrupts
TCCR1A = 0;
TCCR1B = B00000101; // Timer1, normal mode, prescaler 1024. One tick is 64us.
TCNT1 = 0;
TCNT1 = 0; // reset Timer1 counter
}
uint8_t joy1, joy2, PF, PD, PC, PE;
volatile uint8_t joy1, joy2;
void loop() {
uint8_t PF, PD, PC, PE;
PF = PINF; PD = PIND; PC = PINC; PE = PINE;
joy1 = 0xff; joy2 = 0xff;
joy1 = 0xff; joy2 = 0xff; // all signals are inverted (also LED)
if (up1) bitClear(joy1,upC);
if (down1) bitClear(joy1,downC);
if (left1) bitClear(joy1,leftC);
@ -100,20 +111,24 @@ void loop() {
if (right2) bitClear(joy2,rightC);
if (fire1) { bitClear(joy1,fire1C); bitClear(joy2,fire1C); }
if (fire2) { bitClear(joy1,fire2C); bitClear(joy2,fire2C); }
if (mode) { bitClear(joy1,0); bitClear(joy2,0); }
/*if (now > 50000) {
bitSet(joy1,0); bitSet(joy2,0);
}*/
//mode = 1;
//if (mode) { bitClear(joy1,0); bitClear(joy2,0); } // RX LED is in PB0
if (mode) { PORTD &= ~_BV(5); } else { PORTD |= _BV(5); } // TX LED is in PD5
//bitClear(joy1,0); bitClear(joy2,0);
//joy1 = 0; joy2 = 0;
//PORTD |= _BV(5);
output1 = joy1; output2 = joy2;
uint16_t now = TCNT1;
if (mode == 1) {
uint16_t now = TCNT1; // TCNT1 is special 16-bit register, so it must be copied to variable before it can be used
if ((now - last_interrupt) > 15625) mode = 0; // if there is no select-signal in 1s, fallback to 3-joystick mode
} else {
PORTB = output1; // 3-joystick mode, update repeatedly and only joystick 3
if (last_joystick == 1) PORTB = output1; // 3-joystick mode, update repeatedly and only joystick 3
if (last_joystick == 2) PORTB = output2; // 3-joystick mode, update repeatedly and only joystick 4
}
//PORTB = output1; // 3-joystick mode, update repeatedly and only joystick 3
//Serial.print(joy1, BIN); Serial.print(" "); Serial.println(joy2, BIN); delay(100);
//Serial.print(mode, BIN); Serial.print(" "); Serial.println(last_interrupt);
//delayMicroseconds(50);
delayMicroseconds(10);
}