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/* DaemonBite NES Controllers to USB Adapter
* Author: Mikael Norrgård <mick@daemonbite.com>
*
* Copyright (c) 2020 Mikael Norrgård <http://daemonbite.com>
*
* GNU GENERAL PUBLIC LICENSE
* Version 3, 29 June 2007
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#include "Gamepad.h"
// ATT: 20 chars max (including NULL at the end) according to Arduino source code.
// Additionally serial number is used to differentiate arduino projects to have different button maps!
const char *gp_serial = "NES to USB";
//#define DEBUG
#define GAMEPAD_COUNT 2 // NOTE: No more than TWO gamepads are possible at the moment due to a USB HID issue.
#define GAMEPAD_COUNT_MAX 4 // NOTE: For some reason, can't have more than two gamepads without serial breaking. Can someone figure out why?
// (It has something to do with how Arduino handles HID devices)
#define BUTTON_COUNT 8 // Standard NES controller has four buttons and four axes, totalling 8
#define BUTTON_READ_DELAY 20 // Delay between button reads in µs
#define MICROS_LATCH 8 // 12µs according to specs (8 seems to work fine)
#define MICROS_CLOCK 4 // 6µs according to specs (4 seems to work fine)
#define MICROS_PAUSE 4 // 6µs according to specs (4 seems to work fine)
#define UP 0x01
#define DOWN 0x02
#define LEFT 0x04
#define RIGHT 0x08
// Wire it all up according to the following table:
//
// NES SNES Arduino Pro Micro
// --------------------------------------
// VCC VCC (All gamepads)
// GND GND (All gamepads)
// OUT0 (LATCH) 2 (PD1, All gamepads)
// CUP (CLOCK) 3 (PD0, All gamepads)
// D1 (GP1: DATA) A0 (PF7, Gamepad 1)
// D1 (GP2: DATA) A1 (PF6, Gamepad 2)
// D1 (GP3: DATA) A2 (PF5, Gamepad 3, not currently used)
// D1 (GP4: DATA) A3 (PF4, Gamepad 4, not currently used)
// Set up USB HID gamepads
Gamepad_ Gamepad[GAMEPAD_COUNT];
// Controllers
uint8_t buttons[GAMEPAD_COUNT_MAX] = {0,0,0,0};
uint8_t buttonsPrev[GAMEPAD_COUNT_MAX] = {0,0,0,0};
uint8_t gpBit[GAMEPAD_COUNT_MAX] = {B10000000,B01000000,B00100000,B00010000};
uint8_t btnBits[BUTTON_COUNT] = {0x20,0x10,0x40,0x80,UP,DOWN,LEFT,RIGHT};
uint8_t gp = 0;
// Timing
uint32_t microsButtons = 0;
#ifdef DEBUG
uint32_t microsStart = 0;
uint32_t microsEnd = 0;
uint8_t counter = 0;
#endif
void setup()
{
// Setup latch and clock pins (2,3 or PD1, PD0)
DDRD |= B00000011; // output
PORTD &= ~B00000011; // low
// Setup data pins (A0-A3 or PF7-PF4)
DDRF &= ~B11110000; // inputs
PORTF |= B11110000; // enable internal pull-ups
#ifdef DEBUG
Serial.begin(115200);
delay(2000);
#endif
// Short delay to let controllers stabilize
delay(50);
}
void loop() { while(1)
{
// See if enough time has passed since last button read
if((micros() - microsButtons) > BUTTON_READ_DELAY)
{
#ifdef DEBUG
microsStart = micros();
#endif
// Pulse latch
sendLatch();
for(uint8_t btn=0; btn<BUTTON_COUNT; btn++)
{
for(gp=0; gp<GAMEPAD_COUNT; gp++)
(PINF & gpBit[gp]) ? buttons[gp] &= ~btnBits[btn] : buttons[gp] |= btnBits[btn];
sendClock();
}
for(gp=0; gp<GAMEPAD_COUNT; gp++)
{
// Has any buttons changed state?
if (buttons[gp] != buttonsPrev[gp])
{
Gamepad[gp]._GamepadReport.buttons = (buttons[gp] >> 4); // First 4 bits are the axes
Gamepad[gp]._GamepadReport.Y = ((buttons[gp] & DOWN) >> 1) - (buttons[gp] & UP);
Gamepad[gp]._GamepadReport.X = ((buttons[gp] & RIGHT) >> 3) - ((buttons[gp] & LEFT) >> 2);
buttonsPrev[gp] = buttons[gp];
Gamepad[gp].send();
}
}
microsButtons = micros();
#ifdef DEBUG
microsEnd = micros();
if(counter < 20) {
Serial.println(microsEnd-microsStart);
counter++;
}
#endif
}
}}
void sendLatch()
{
// Send a latch pulse to the NES controller(s)
PORTD |= B00000010; // Set HIGH
delayMicroseconds(MICROS_LATCH);
PORTD &= ~B00000010; // Set LOW
delayMicroseconds(MICROS_PAUSE);
}
void sendClock()
{
// Send a clock pulse to the NES controller(s)
PORTD |= B10000001; // Set HIGH
delayMicroseconds(MICROS_CLOCK);
PORTD &= ~B10000001; // Set LOW
delayMicroseconds(MICROS_PAUSE);
}