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dreamcast_usb/dc_pad.c

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/* Dreamcast to USB : Sega dc controllers to USB adapter
* Copyright (C) 2013 Raphaël Assénat
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* The author may be contacted at raph@raphnet.net
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <avr/pgmspace.h>
#include <string.h>
#include "usbdrv.h"
#include "gamepad.h"
#include "dc_pad.h"
#include "maplebus.h"
#define MOUSE_REPORT_SIZE 5
#define CONTROLLER_REPORT_SIZE 6
#define MAX_REPORT_SIZE 6
#define NUM_REPORTS 1
// report matching the most recent bytes from the controller
static unsigned char last_built_report[NUM_REPORTS][MAX_REPORT_SIZE];
// the most recently reported bytes
static unsigned char last_sent_report[NUM_REPORTS][MAX_REPORT_SIZE];
static unsigned char cur_report_size = CONTROLLER_REPORT_SIZE;
static Gamepad dcGamepad;
static void dcUpdate(void);
/*
* [0] X
* [1] Y
* [2] Ltrig
* [3] Rtrig
* [4] Btn 0-7
* [5] Btn 8-15
*/
static const unsigned char dcPadReport[] PROGMEM = {
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x05, // USAGE (Game pad)
0xa1, 0x01, // COLLECTION (Application)
0x09, 0x01, // USAGE (Pointer)
0xa1, 0x00, // COLLECTION (Physical)
0x09, 0x30, // USAGE (X)
0x09, 0x31, // USAGE (Y)
0x09, 0x36, // USAGE (Slider)
0x09, 0x36,
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
};
/*
* [0] Mouse buttons
* [1] Mouse X
* [2] Mouse X
* [3] Mouse Y
* [4] Mouse Y
*/
static const unsigned char dcMouseReport[] PROGMEM = {
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x02, // USAGE (Mouse)
0xa1, 0x01, // COLLECTION (Application)
0x09, 0x01, // USAGE (Pointer)
0xa1, 0x00, // COLLECTION (Physical)
0x05, 0x09, // USAGE_PAGE (Button)
0x19, 0x01, // USAGE_MINIMUM (Button 1)
0x29, 0x04, // USAGE_MAXIMUM (Button 4)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x95, 0x04, // REPORT_COUNT (4)
0x75, 0x01, // REPORT_SIZE (1)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x95, 0x01, // REPORT_COUNT (1)
0x75, 0x04, // REPORT_SIZE (4)
0x81, 0x03, // INPUT (Cnst,Var,Abs)
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x30, // USAGE (X)
0x09, 0x31, // USAGE (Y)
0x16, 0x01, 0xFE, // LOGICAL_MINIMUM (-511)
0x26, 0xFF, 0x01, // LOGICAL_MAXIMUM (511)
0x75, 0x10, // REPORT_SIZE (16)
0x95, 0x02, // REPORT_COUNT (2)
0x81, 0x06, // INPUT (Data,Var,Rel)
0xc0, // END_COLLECTION
0xc0, // END_COLLECTION
};
const unsigned char dcPadDevDesc[] PROGMEM = { /* USB device descriptor */
18, /* sizeof(usbDescrDevice): length of descriptor in bytes */
USBDESCR_DEVICE, /* descriptor type */
0x01, 0x01, /* USB version supported */
USB_CFG_DEVICE_CLASS,
USB_CFG_DEVICE_SUBCLASS,
0, /* protocol */
8, /* max packet size */
0x9B, 0x28, // Vendor ID
0x08, 0x00, // Product ID
0x00, 0x01, // Version: Minor, Major
1, // Manufacturer String
2, // Product string
3, // Serial number string
1, /* number of configurations */
};
const unsigned char dcMouseDevDesc[] PROGMEM = { /* USB device descriptor */
18, /* sizeof(usbDescrDevice): length of descriptor in bytes */
USBDESCR_DEVICE, /* descriptor type */
0x01, 0x01, /* USB version supported */
USB_CFG_DEVICE_CLASS,
USB_CFG_DEVICE_SUBCLASS,
0, /* protocol */
8, /* max packet size */
0x9B, 0x28, // Vendor ID
0x09, 0x00, // Product ID
0x00, 0x01, // Version: Minor, Major
1, // Manufacturer String
2, // Product string
3, // Serial number string
1, /* number of configurations */
};
#define DEFAULT_FUNCTION MAPLE_FUNC_CONTROLLER
static uint16_t cur_connected_device = DEFAULT_FUNCTION;
/* Used to report the change of function to the main loop
* which will then re-init. */
static char dcDescriptorsChanged(void)
{
static uint16_t previous_function = DEFAULT_FUNCTION;
if (cur_connected_device != previous_function) {
previous_function = cur_connected_device;
return 1;
}
return 0;
}
static void setConnectedDevice(uint16_t func)
{
cur_connected_device = func;
switch (func)
{
case MAPLE_FUNC_CONTROLLER:
dcGamepad.reportDescriptor = (void*)dcPadReport;
dcGamepad.reportDescriptorSize = sizeof(dcPadReport);
dcGamepad.deviceDescriptor = (void*)dcPadDevDesc;
dcGamepad.deviceDescriptorSize = sizeof(dcPadDevDesc);
cur_report_size = CONTROLLER_REPORT_SIZE;
break;
case MAPLE_FUNC_MOUSE:
dcGamepad.reportDescriptor = (void*)dcMouseReport;
dcGamepad.reportDescriptorSize = sizeof(dcMouseReport);
dcGamepad.deviceDescriptor = (void*)dcMouseDevDesc;
dcGamepad.deviceDescriptorSize = sizeof(dcMouseDevDesc);
cur_report_size = MOUSE_REPORT_SIZE;
break;
}
}
static void dcInit(void)
{
dcUpdate();
setConnectedDevice(DEFAULT_FUNCTION);
}
#define MAX_ERRORS 100
#define STATE_RESET_DEVICE 0
#define STATE_GET_INFO 1
#define STATE_READ_PAD 2
#define STATE_READ_MOUSE 3
#define STATE_GET_EXT_INFO 4
static void dcReadPad(void)
{
static unsigned char state = STATE_RESET_DEVICE;
static unsigned char err_count = 0;
unsigned char tmp[30];
static unsigned char func_data[4];
int v;
switch (state)
{
case STATE_RESET_DEVICE:
{
maple_sendFrame(MAPLE_CMD_RESET_DEVICE,
MAPLE_ADDR_MAIN | MAPLE_ADDR_PORTA,
MAPLE_DC_ADDR, 0, NULL);
state = STATE_GET_INFO;
}
break;
case STATE_GET_INFO:
{
maple_sendFrame(MAPLE_CMD_RQ_DEV_INFO,
MAPLE_ADDR_MAIN | MAPLE_ADDR_PORTB,
MAPLE_DC_ADDR | MAPLE_ADDR_PORTB, 0, NULL);
v = maple_receiveFrame(tmp, 30);
// Too many data arrives and we stop listening before the controller stop transmitting. The delay
// here is to wait until the bus is idle again before continuing.
_delay_ms(2);
if (v==-2) {
uint16_t func;
// 0-3 Header
// 4-7 Func
// ...
func = tmp[4] | tmp[5]<<8;
if (func & MAPLE_FUNC_CONTROLLER) {
state = STATE_READ_PAD;
setConnectedDevice(MAPLE_FUNC_CONTROLLER);
} else if (func & MAPLE_FUNC_MOUSE) {
state = STATE_READ_MOUSE;
memcpy(func_data, tmp + 5, 4);
setConnectedDevice(MAPLE_FUNC_MOUSE);
}
}
err_count = 0;
}
break;
case STATE_READ_MOUSE:
{
int16_t rel_x, rel_y;
uint8_t btns;
maple_sendFrame1W(MAPLE_CMD_GET_CONDITION,
MAPLE_ADDR_PORTB | MAPLE_ADDR_MAIN,
MAPLE_ADDR_PORTB | MAPLE_DC_ADDR,
MAPLE_FUNC_MOUSE);
v = maple_receiveFrame(tmp, 30);
// The mouse sends too much data, it fills the receive buffer. Also,
// there is a pause in the transmission that does not help.
// The wheel drata and the the LRC are missed.
//
// As such, mouse support is incomplete and a hack.
//
/* if (v==-2) {
err_count++;
if (err_count > MAX_ERRORS) {
state = STATE_RESET_DEVICE;
}
return;
}
err_count = 0;
*/
// 8 : Buttons
// 9 : Buttons
// 10 : Buttons
// 11 : Buttons
// 12 : Y axis MSB
// 13 : Y axis LSB
// 14 : X axis MSB
// 15 : X axis LSB
//
// 16 : Wheel MSB
// 17 : Wheel LSB
// bit 0 : Middle button
// bit 1 : Right button
// bit 2 : Left button
// bit 3 : Thumb button
tmp[11] ^= 0xf;
btns = 0;
if (tmp[11] & 2) btns = 0x02; // DC Right -> USB btn 1
if (tmp[11] & 4) btns = 0x01; // DC Left -> USB btn 0
// If the mouse has a physical middle button, let it work
// normally. Otherwise, use the thumb button.
if (func_data[2] & 0x01) {
if (tmp[11] & 1) btns = 0x04; // DC Middle -> USB btn 2
if (tmp[11] & 8) btns = 0x08; // DC Thumb -> USB btn 3
} else {
if (tmp[11] & 8) btns = 0x04; // DC Thumb -> btn 2
}
rel_x = (tmp[15] | tmp[14]<<8) - 0x200;
rel_y = (tmp[13] | tmp[12]<<8) - 0x200;
last_built_report[0][0] = btns;
last_built_report[0][1] = rel_x & 0xff;
last_built_report[0][2] = rel_x >> 8;
last_built_report[0][3] = rel_y & 0xff;
last_built_report[0][4] = rel_y >> 8;
}
break;
case STATE_READ_PAD:
{
maple_sendFrame1W(MAPLE_CMD_GET_CONDITION,
MAPLE_ADDR_PORTB | MAPLE_ADDR_MAIN,
MAPLE_DC_ADDR | MAPLE_ADDR_PORTB,
MAPLE_FUNC_CONTROLLER);
v = maple_receiveFrame(tmp, 30);
if (v<=0) {
err_count++;
if (err_count > MAX_ERRORS) {
state = STATE_GET_INFO;
}
return;
}
err_count = 0;
if (v < 16)
return;
// 8 : Buttons
// 9 : Buttons
// 10 : R trig
// 11 : L trig
// 12 : Joy X axis
// 13 : Joy Y axis
// 14 : Joy X2 axis
// 15 : Joy Y2 axis
last_built_report[0][0] = tmp[12];
last_built_report[0][1] = tmp[13];
last_built_report[0][2] = tmp[10] / 2 + 0x80;
last_built_report[0][3] = tmp[11] / 2 + 0x80;
last_built_report[0][4] = tmp[8] ^ 0xff;
last_built_report[0][5] = tmp[9] ^ 0xff;
}
break;
}
}
static void dcUpdate(void)
{
dcReadPad();
}
static char dcBuildReport(unsigned char *reportBuffer, unsigned char report_id)
{
report_id = 0;
if (reportBuffer != NULL)
{
memcpy(reportBuffer, last_built_report[report_id], cur_report_size);
}
memcpy(last_sent_report[report_id], last_built_report[report_id], cur_report_size);
return cur_report_size;
}
static char dcChanged(unsigned char report_id)
{
report_id = 0;
return memcmp(last_built_report[report_id], last_sent_report[report_id], cur_report_size);
}
static Gamepad dcGamepad = {
num_reports: 1,
init: dcInit,
update: dcUpdate,
changed: dcChanged,
buildReport: dcBuildReport,
descriptorsChanged: dcDescriptorsChanged,
};
Gamepad *dcGetGamepad(void)
{
return &dcGamepad;
}
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