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Merging PS2USB with C64 Code

https://forums.obdev.at/viewtopic.php?f=8&t=3944

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Merging PS2USB with C64 Code

Posted: Mon Mar 01, 2010 5:59 am
by supersonik
My project requires reading a Playstation Controller and translating that into Keyboard inputs (ie pressing up on the controller makes the AVR send a U keystroke, pressing the circle makes the avr type o etc). I've successfully loaded the PS2USB code and the C64 code and tested them individually, but I cannot seem to merge them correctly. I use the C64 code, usb descriptor, and everything else USB related, and my avr shows up fine as the C64 keyboard. I set up the hardware as the schematics for the PS2USB show. No matter how many times I've tried, I cannot get the code I've tried to merge together to work. The most confusion I have is in translating the PSX controller codes to USB keycodes. Can anyone help?

Here is my pathetic attempt at the code, after hours of getting nowhere.

Code: Select all

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/wdt.h>

#include "usbdrv.h"
#include "oddebug.h"
#include <util/delay.h>

static uchar ps2buffer[9]={0,0,0,0,0,0,0,0,0};
static uchar type=0;
static uchar type1=0; // 0=Normal digital, >200 = DDR Pad
static uchar type2=0;
static uchar outBuffer1[8];
static uchar outBuffer2[8];

/* ----------------------- hardware I/O abstraction ------------------------ */


/* ------------------------------------------------------------------------- */

static void hardwareInit(void)
{
uchar   i, j;

   DDRB = 0x2F;   // PORTB; everythin output, except MISO
   PORTB = 0x04;   // ATT lines, uses CS and another pin

    PORTC = 0;      // Don't need these atm.
    DDRC = 0;      // Don't need these atm.

    PORTD = 0xfa;   /* 1111 1010 bin: activate pull-ups except on USB lines */
    DDRD = 0x07;    /* 0000 0111 bin: all pins input except USB (-> USB reset) */
   j = 0;
   while(--j){     /* USB Reset by device only required on Watchdog Reset */
      i = 0;
      while(--i); /* delay >10ms for USB reset */
   }
    DDRD = 0x02;    /* 0000 0010 bin: remove USB reset condition */
}

/* ------------------------------------------------------------------------- */

/* ------------------------------------------------------------------------- */
/* ----------------------Atmega8 SPI, master, 93.75khz---------------------- */
/* ------------------------------------------------------------------------- */

void spi_mInit()
{
   // SPI, master, clock/128 = 93.75khz (187.5 didn't work...)
   SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR1)|(1<<SPR0)|(1<<DORD)|(1<<CPHA)|(1<<CPOL);
}

unsigned char spi_mSend(unsigned char podatek)   //straight from documentation
{

   // Gets information, sends it, waits untill it's sent, then reads the same register (used for both Input and Output) and returns it

   /* Start transmission */
   SPDR = podatek;
   while(!(SPSR & (1<<SPIF)));

   return SPDR;
}

/* ------------------------------------------------------------------------- */

/* ------------------------------------------------------------------------- */
/* ----------------------------- USB interface ----------------------------- */
/* ------------------------------------------------------------------------- */

static uchar    reportBuffer[8];    /* buffer for HID reports */
static uchar    idleRate; // Unused

PROGMEM char usbHidReportDescriptor[USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH] = { /* USB report descriptor */

    0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
    0x09, 0x04,                    // USAGE (Joystick)
    0xa1, 0x01,                    // COLLECTION (Application)
    0x09, 0x01,                    //   USAGE (Pointer)
    0xa1, 0x00,                    //   COLLECTION (Physical)
    0x85, 0x01,                    //     REPORT_ID (1)
    0x09, 0x30,                    //     USAGE (X)
    0x09, 0x31,                    //     USAGE (Y)
    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
    0x25, 0x0f,                    //     LOGICAL_MAXIMUM (15)
    0x75, 0x04,                    //     REPORT_SIZE (4)
    0x95, 0x02,                    //     REPORT_COUNT (2)
    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
    0x09, 0x32,                    //     USAGE (Z)
    0x09, 0x33,                    //     USAGE (Rx)
    0x09, 0x34,                    //     USAGE (Ry)
    0x09, 0x35,                    //     USAGE (Rz)
    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
    0x26, 0xff, 0x00,              //     LOGICAL_MAXIMUM (255)
    0x75, 0x08,                    //     REPORT_SIZE (8)
    0x95, 0x04,                    //     REPORT_COUNT (4)
    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
    0x05, 0x09,                    //     USAGE_PAGE (Button)
    0x19, 0x01,                    //     USAGE_MINIMUM (Button 1)
    0x29, 0x10,                    //     USAGE_MAXIMUM (Button 16)
    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
    0x25, 0x01,                    //     LOGICAL_MAXIMUM (1)
    0x75, 0x01,                    //     REPORT_SIZE (1)
    0x95, 0x10,                    //     REPORT_COUNT (16)
    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
    0xc0,                          //     END_COLLECTION
    0xc0,                          // END_COLLECTION

    0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
    0x09, 0x04,                    // USAGE (Joystick)
    0xa1, 0x01,                    // COLLECTION (Application)
    0x09, 0x01,                    //   USAGE (Pointer)
    0xa1, 0x00,                    //   COLLECTION (Physical)
    0x85, 0x02,                    //     REPORT_ID (1)
    0x09, 0x30,                    //     USAGE (X)
    0x09, 0x31,                    //     USAGE (Y)
    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
    0x25, 0x0f,                    //     LOGICAL_MAXIMUM (15)
    0x75, 0x04,                    //     REPORT_SIZE (4)
    0x95, 0x02,                    //     REPORT_COUNT (2)
    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
    0x09, 0x32,                    //     USAGE (Z)
    0x09, 0x33,                    //     USAGE (Rx)
    0x09, 0x34,                    //     USAGE (Ry)
    0x09, 0x35,                    //     USAGE (Rz)
    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
    0x26, 0xff, 0x00,              //     LOGICAL_MAXIMUM (255)
    0x75, 0x08,                    //     REPORT_SIZE (8)
    0x95, 0x04,                    //     REPORT_COUNT (4)
    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
    0x05, 0x09,                    //     USAGE_PAGE (Button)
    0x19, 0x01,                    //     USAGE_MINIMUM (Button 1)
    0x29, 0x10,                    //     USAGE_MAXIMUM (Button 16)
    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
    0x25, 0x01,                    //     LOGICAL_MAXIMUM (1)
    0x75, 0x01,                    //     REPORT_SIZE (1)
    0x95, 0x10,                    //     REPORT_COUNT (16)
    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
    0xc0,                          //     END_COLLECTION
    0xc0,                           // END_COLLECTION

};

/* ------------------------------------------------------------------------- */

// Delays


void wait100us(){
   _delay_us(100);
}


/* ------------------------------------------------------------------------- */
/* ------------------------------- Get data! ------------------------------- */
/* ------------------------------------------------------------------------- */

void get_data(int c) {

      if (c==0){
         PORTB=0x02;
      }
      else if(c==1){
         PORTB=0x04;
      }

      _delay_ms(1);
      ps2buffer[0]=spi_mSend(0x01);   // We want data!
      wait100us();      
      ps2buffer[1]=spi_mSend(0x42);   // What's your model? (use later)
      wait100us();   

      if (ps2buffer[1]==0x41){      // Digital pad, possibly DDR Pad

      ps2buffer[2]=spi_mSend(0x00);
      wait100us();   
      ps2buffer[3]=spi_mSend(0x00);
      wait100us();         
      ps2buffer[4]=spi_mSend(0x00);
      wait100us();
      ps2buffer[5]=spi_mSend(0x00);
      wait100us();
      ps2buffer[6]=spi_mSend(0x00);
      wait100us();
      ps2buffer[7]=spi_mSend(0x00);
      wait100us();
      ps2buffer[8]=spi_mSend(0x00);
      

      } else if (ps2buffer[1]==0x73){// Standard Analog pad in RED mode   

      ps2buffer[2]=spi_mSend(0x00);
      wait100us();   
      ps2buffer[3]=spi_mSend(0x00);
      wait100us();         
      ps2buffer[4]=spi_mSend(0x00);
      wait100us();   
      ps2buffer[5]=spi_mSend(0x00);
      wait100us();   
      ps2buffer[6]=spi_mSend(0x00);
      wait100us();         
      ps2buffer[7]=spi_mSend(0x00);
      wait100us();         
      ps2buffer[8]=spi_mSend(0x00);

      } else {

      ps2buffer[2]=0;
      ps2buffer[3]=0;      
      ps2buffer[4]=0;   
      ps2buffer[5]=0;
      ps2buffer[6]=0;
      ps2buffer[7]=0;         
      ps2buffer[8]=0;

      }
   
      PORTB = 0x06;
      _delay_ms(1);

}

/* ------------------------------------------------------------------------- */

/* ------------------------------------------------------------------------- */
/* ----------------------- Make sense from the data! ----------------------- */
/* ------------------------------------------------------------------------- */

// Is the controller digital, analog, dance pad,...

void make_sense(int t) {

   if (t==0){
      type=type1;
   }
   else if (t==1){
      type=type2;
   }

   int temp1=255-ps2buffer[3];
   int temp2=255-ps2buffer[4];

   if (ps2buffer[1]==0x41){      // Digital pad
      
      // Zero the unused axes
      reportBuffer[2]=0x80;
      reportBuffer[3]=0x80;
      reportBuffer[4]=0x80;
      reportBuffer[5]=0x80;

      // Buttons!
      reportBuffer[6]=((temp1 & 0x01) << 0) | ((temp1 & 0x08) >> 2) | ((temp2 & 0x01) << 2) | ((temp2 & 0x02) << 2) | ((temp2 & 0x04) << 2) | ((temp2 & 0x08) << 2) | ((temp2 & 0x10) << 2) | ((temp2 & 0x20) << 2);
      
      reportBuffer[7]=((temp2 & 0x40) >> 6) | ((temp2 & 0x80) >> 6) | ((temp1 & 0x02) << 1)  | ((temp1 & 0x04) << 1);

      

      if (type < 200){      
   
      // Up, Down - Y! Axis
         if (temp1 & 0x10){
            reportBuffer[1]=0x00;
         }
         else if (temp1 & 0x40){
            reportBuffer[1]=0xF0;
         }
         else {
            reportBuffer[1]=0x80;
         }   
   
         // Right, Left - X! Axis

         if (temp1 & 0x20){
            reportBuffer[1]=reportBuffer[1]+0x0F;
         }
         else if (temp1 & 0x80){
            reportBuffer[1]=reportBuffer[1]+0x00;
         }
         else {
            reportBuffer[1]=reportBuffer[1]+0x08;
         }
         
         reportBuffer[7] &= ~0x10 | ~0x20 | ~0x40 | ~0x80;

      } else {   

         reportBuffer[7] = ((temp2 & 0x40) >> 6) | ((temp2 & 0x80) >> 6) | ((temp1 & 0x02) << 1)  | ((temp1 & 0x04) << 1) | (temp1 & 0x10) | (temp1 & 0x20) |(temp1 & 0x40) | (temp1 & 0x80);
         reportBuffer[1]=0x88;
      
         type = 222;

      }

      if ((temp1 & 0x01) && (temp1 & 0x08) &&  (temp1 & 0x10) ){
         type++;
         if (t==0){
            type1=type;
         }   
         else if (t==1){
            type2=type;
         }
      }

   }

   else if (ps2buffer[1]==0x73){      // Decode analog pad
      
      // Right stick, X axis
      reportBuffer[2]=ps2buffer[5];
      // Right stick, Y axis
      reportBuffer[3]=ps2buffer[6];
      // Left stick,  X axis
      reportBuffer[4]=ps2buffer[7];
      // Left stick,  Y axis
      reportBuffer[5]=ps2buffer[8];

      //Buttons, buttons, so many buttons!

      // Up, Down - Y! Axis
      if (temp1 & 0x10){
         reportBuffer[1]=0x00;
      }
      else if (temp1 & 0x40){
         reportBuffer[1]=0xF0;
      }
      else {
         reportBuffer[1]=0x80;
      }

      // Right, Left - X! Axis

      if (temp1 & 0x20){
         reportBuffer[1]=reportBuffer[1]+0x0F;
      }
      else if (temp1 & 0x80){
         reportBuffer[1]=reportBuffer[1]+0x00;
      }
      else {
         reportBuffer[1]=reportBuffer[1]+0x08;
      }
      
      reportBuffer[6]=((temp1 & 0x01) << 0) | ((temp1 & 0x08) >> 2) | ((temp2 & 0x01) << 2) | ((temp2 & 0x02) << 2) | ((temp2 & 0x04) << 2) | ((temp2 & 0x08) << 2) | ((temp2 & 0x10) << 2) | ((temp2 & 0x20) << 2);
      
      reportBuffer[7]=((temp2 & 0x40) >> 6) | ((temp2 & 0x80) >> 6) | ((temp1 & 0x02) << 1)  | ((temp1 & 0x04) << 1);

      reportBuffer[7] &= ~0x10 | ~0x20 | ~0x40 | ~0x80;


   } else { // If there isn't a pad connected, or if it is an unsupported one, zero the axes and the buttons

      reportBuffer[1]= 0x88;
      reportBuffer[2]= 0x80;
      reportBuffer[3]= 0x80;
      reportBuffer[4]= 0x80;
      reportBuffer[5]= 0x80;
      reportBuffer[6]= 0;
      reportBuffer[7]= 0;
   }

}

/* ------------------------------------------------------------------------- */

uchar   usbFunctionSetup(uchar data[8])
{
usbRequest_t    *rq = (void *)data;

          
    if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){    /* class request type */
        if(rq->bRequest == USBRQ_HID_GET_REPORT){  /* wValue: ReportType (highbyte), ReportID (lowbyte) */


      reportBuffer[0]= 0;
      reportBuffer[1]= 0;
      reportBuffer[2]= 0;
      reportBuffer[3]= 0;
      reportBuffer[4]= 0;
      reportBuffer[5]= 0;
      reportBuffer[6]= 0;
      reportBuffer[7]= 0;

      usbMsgPtr = reportBuffer;

       return sizeof (reportBuffer);

        }else if(rq->bRequest == USBRQ_HID_GET_IDLE){
            usbMsgPtr = &idleRate;
            return 1;
        }else if(rq->bRequest == USBRQ_HID_SET_IDLE){
            idleRate = rq->wValue.bytes[1];
        }
    }else{
        /* no vendor specific requests implemented */
    }
   return 0;
}

/* ------------------------------------------------------------------------- */

int   main(void)
{
uchar   idleCounter = 0;

   wdt_enable(WDTO_2S);
    hardwareInit();
   odDebugInit();
   usbInit();
   sei();
   
   spi_mInit();   // SPI

   int x=0;
   int changed=0;

      // Tell the computer we're here, make prerequisites for later
      
      // 1st gamepad
      wdt_reset();
      usbPoll();
      get_data(0);
      make_sense(0);
      reportBuffer[0]= 0x01;

      for (x=0; x<8; x++) {
          outBuffer1[x]=reportBuffer[x];
      }

      while (!usbInterruptIsReady()) { wdt_reset(); usbPoll(); }   

      usbSetInterrupt(reportBuffer, sizeof(reportBuffer));


      // 2nd gamepad
      get_data(1);
      make_sense(1);
      reportBuffer[0]= 0x02;
      for (x=0; x<8; x++) {
          outBuffer2[x]=reportBuffer[x];
      }
      while (!usbInterruptIsReady()) { wdt_reset(); usbPoll(); }   

      usbSetInterrupt(reportBuffer, sizeof(reportBuffer));


      changed=0;

   // Main loop
   // This loop checks one gamepad, if the state of buttons changed, it waits untill it can send the data and then send it,
   // otherwise it checks the other gamepad and does the same thing (this approach saves time)  
   for(;;){   
   
      // 1st gamepad
      wdt_reset();
      usbPoll();

      get_data(0);
      make_sense(0);
      reportBuffer[0]= 0x01;
   
      for (x=0; x<8; x++) {
           if (outBuffer1[x]!=reportBuffer[x]){
            changed=1;
         }
      }

      if (changed==1){
      while (!usbInterruptIsReady()) { wdt_reset(); usbPoll(); }
      usbSetInterrupt(reportBuffer, sizeof(reportBuffer));

      for (x=0; x<8; x++) {
          outBuffer1[x]=reportBuffer[x];
      }
      
      changed=0;

      }


      // 2nd gamepad
      wdt_reset();
      usbPoll();
      get_data(1);
      make_sense(1);
      reportBuffer[0]= 0x02;

      for (x=0; x<8; x++) {
           if (outBuffer2[x]!=reportBuffer[x]){
            changed=1;
         }
      }

      if (changed==1){
      while (!usbInterruptIsReady()) { wdt_reset(); usbPoll(); }
      usbSetInterrupt(reportBuffer, sizeof(reportBuffer));

      for (x=0; x<8; x++) {
          outBuffer2[x]=reportBuffer[x];
      }

      changed=0;
      }
      wdt_reset();
      usbPoll();      
      
      
   }
   return 0;
}

/* ------------------------------------------------------------------------- */

Re: Merging PS2USB with C64 Code

Posted: Wed Mar 03, 2010 11:10 am
by Alan Chatham
A couple things:

1., I'm confused about your report descriptor - it seems like the report descriptor is trying to say "I'm a joystick!", and if you're trying to emulate a keyboard, that's not going to work.. Although quickly glancing down at your code, I didn't see anything obviously keyboard related? It seems like it's just trying to read the data from two PS2 controllers then convert that to USB. So one possible problem you might be getting is if you haven't changed your VID/PID pair from when you compiled it as a C64 Keyboard, since now when you plug it in, windows will expect a keyboard, and if the HID descriptor tells it that it's something else, Windows says "You're malfunctioning" and ignores the device (that's how I understand it, anyhow)

2., Can you get the PS2USB code working on it's own? I.E., without any changes made by you? Or set up some LEDs to see if you're successfully communicating with the PS2 controller. That will help you figure out if the trouble is in your SPI stuff or if it's in your other code.

In general, to merge the two projects, you'll need all the report descriptor stuff from the keyboard project, then figure out how the keyboard is sending it's data to the PC. What I'm assuming is relatively untouched code that you shared, is not ideal since in the "make_sense" function, it sets the actual bits in the report_buffer array. Personally, I'd make a new data member that holds the abstract information about a controller's state, i.e. what buttons are being pressed. Then in the make_sense function, that data structure gets filled with , then in your main function, you can set the bits of the report_buffer based on that controller state structure, abstracting your functions into more independent entities. This way, it'll be a lot easier to rip out the code from the C64 Keyboard project and set up keys to get pressed.

Sorry I don't know much about actually emulating a keyboard, though, but there are a fair number of projects here and elsewhere that do implement keyboards, so you might look at some of them. For example, the Ghost Cable project sends random keystrokes to the computer, which might have a better explanation of what stuff you need to send to the PC.
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