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dreamcast_usb/main.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 <avr/pgmspace.h>
#include <avr/wdt.h>
#include <avr/sleep.h>
#include <util/delay.h>
#include <string.h>
#include "usbdrv.h"
#include "oddebug.h"
#include "gamepad.h"
#include "dc_pad.h"
static usbMsgPtr_t rt_usbHidReportDescriptor = USB_NO_MSG;
static usbMsgLen_t rt_usbHidReportDescriptorSize = 0;
static usbMsgPtr_t rt_usbDeviceDescriptor = USB_NO_MSG;
static usbMsgLen_t rt_usbDeviceDescriptorSize = 0;
#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168A__) || \
defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328__) || \
defined(__AVR_ATmega328P__) || defined(__AVR_ATmega88__) || \
defined(__AVR_ATmega88A__) || defined(__AVR_ATmega88P__) || \
defined(__AVR_ATmega88PA__)
#define AT168_COMPATIBLE
#endif
const PROGMEM int usbDescriptorStringSerialNumber[] = {
USB_STRING_DESCRIPTOR_HEADER(4),
'1','0','0','0'
};
char usbDescriptorConfiguration[] = { 0 }; // dummy
uchar my_usbDescriptorConfiguration[] = { /* USB configuration descriptor */
9, /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */
USBDESCR_CONFIG, /* descriptor type */
18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + 9, 0,
/* total length of data returned (including inlined descriptors) */
1, /* number of interfaces in this configuration */
1, /* index of this configuration */
0, /* configuration name string index */
#if USB_CFG_IS_SELF_POWERED
USBATTR_SELFPOWER, /* attributes */
#else
USBATTR_BUSPOWER, /* attributes */
#endif
USB_CFG_MAX_BUS_POWER/2, /* max USB current in 2mA units */
/* interface descriptor follows inline: */
9, /* sizeof(usbDescrInterface): length of descriptor in bytes */
USBDESCR_INTERFACE, /* descriptor type */
0, /* index of this interface */
0, /* alternate setting for this interface */
USB_CFG_HAVE_INTRIN_ENDPOINT, /* endpoints excl 0: number of endpoint descriptors to follow */
USB_CFG_INTERFACE_CLASS,
USB_CFG_INTERFACE_SUBCLASS,
USB_CFG_INTERFACE_PROTOCOL,
0, /* string index for interface */
//#if (USB_CFG_DESCR_PROPS_HID & 0xff) /* HID descriptor */
9, /* sizeof(usbDescrHID): length of descriptor in bytes */
USBDESCR_HID, /* descriptor type: HID */
0x01, 0x01, /* BCD representation of HID version */
0x00, /* target country code */
0x01, /* number of HID Report (or other HID class) Descriptor infos to follow */
0x22, /* descriptor type: report */
USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0, /* total length of report descriptor */
//#endif
#if USB_CFG_HAVE_INTRIN_ENDPOINT /* endpoint descriptor for endpoint 1 */
7, /* sizeof(usbDescrEndpoint) */
USBDESCR_ENDPOINT, /* descriptor type = endpoint */
0x81, /* IN endpoint number 1 */
0x03, /* attrib: Interrupt endpoint */
8, 0, /* maximum packet size */
USB_CFG_INTR_POLL_INTERVAL, /* in ms */
#endif
};
static Gamepad *curGamepad;
/* ----------------------- hardware I/O abstraction ------------------------ */
static void hardwareInit(void)
{
/* PORTB
*
* Bit Description Direction Level/pu
* 0 Jumpers common Out 0
* 1 JP1 In 1
* 2 JP2 In 1
* 3 MOSI In 1
* 4 MISO In 1
* 5 SCK In 1
* 6 -
* 7 -
*/
DDRB = 0x01;
PORTB = 0xFE;
// temporaty debug pin PB4
DDRB |= 0x10;
/*
* PORTC
*
* Bit
* 0 Pin 1
* 1 Pin 5
*/
DDRC = 0x00;
PORTC = 0xff;
/*
* For port D, activate pull-ups on all lines except the D+, D- and bit 1.
*
* For historical reasons (a mistake on an old PCB), bit 1
* is now always connected with bit 0. So bit 1 configured
* as an input without pullup.
*
* Usb pin are init as output, low. (device reset). They are released
* later when usbReset() is called.
*/
PORTD = 0xf8;
DDRD = 0x01 | 0x04;
/* Configure timers */
#if defined(AT168_COMPATIBLE)
TCCR2A= (1<<WGM21);
TCCR2B=(1<<CS22)|(1<<CS21)|(1<<CS20);
// OCR2A=196; // for 60 hz
OCR2A=50; // for 60 hz
#else
TCCR2 = (1<<WGM21)|(1<<CS22)|(1<<CS21)|(1<<CS20);
//OCR2 = 196; // for 60 hz
OCR2 = 50; // for 60 hz
#endif
}
#if defined(AT168_COMPATIBLE)
#define mustPollControllers() (TIFR2 & (1<<OCF2A))
#define clrPollControllers() do { TIFR2 = 1<<OCF2A; } while(0)
#else
#define mustPollControllers() (TIFR & (1<<OCF2))
#define clrPollControllers() do { TIFR = 1<<OCF2; } while(0)
#endif
static void usbReset(void)
{
/* [...] a single ended zero or SE0 can be used to signify a device
reset if held for more than 10mS. A SE0 is generated by holding
both th D- and D+ low (< 0.3V).
*/
PORTD &= ~(0x01 | 0x04); // Set D+ and D- to 0
DDRD |= 0x01 | 0x04;
_delay_ms(15);
DDRD &= ~(0x01 | 0x04);
}
static uchar reportBuffer[16]; /* buffer for HID reports */
/* ------------------------------------------------------------------------- */
/* ----------------------------- USB interface ----------------------------- */
/* ------------------------------------------------------------------------- */
usbMsgLen_t usbFunctionDescriptor(struct usbRequest *rq)
{
if ((rq->bmRequestType & USBRQ_TYPE_MASK) != USBRQ_TYPE_STANDARD)
return 0;
if (rq->bRequest == USBRQ_GET_DESCRIPTOR)
{
// USB spec 9.4.3, high byte is descriptor type
switch (rq->wValue.bytes[1])
{
case USBDESCR_DEVICE:
usbMsgPtr = rt_usbDeviceDescriptor;
return rt_usbDeviceDescriptorSize;
case USBDESCR_HID_REPORT:
usbMsgPtr = rt_usbHidReportDescriptor;
return rt_usbHidReportDescriptorSize;
case USBDESCR_CONFIG:
usbMsgPtr = (usbMsgPtr_t)my_usbDescriptorConfiguration;
return sizeof(my_usbDescriptorConfiguration);
}
}
return 0;
}
usbMsgLen_t usbFunctionSetup(uchar data[8])
{
usbRequest_t *rq = (void *)data;
usbMsgPtr = (usbMsgPtr_t)reportBuffer;
if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){ /* class request type */
if(rq->bRequest == USBRQ_HID_GET_REPORT){ /* wValue: ReportType (highbyte), ReportID (lowbyte) */
return curGamepad->buildReport(reportBuffer, rq->wValue.bytes[0]);
}
}else{
/* no vendor specific requests implemented */
}
return 0;
}
/* ------------------------------------------------------------------------- */
int main(void)
{
char must_report = 0;
int i;
hardwareInit();
curGamepad = dcGetGamepad();
curGamepad->init();
reconnect:
// configure report descriptor according to
// the current gamepad
rt_usbHidReportDescriptor = (usbMsgPtr_t)curGamepad->reportDescriptor;
rt_usbHidReportDescriptorSize = curGamepad->reportDescriptorSize;
rt_usbDeviceDescriptor = (usbMsgPtr_t)curGamepad->deviceDescriptor;
rt_usbDeviceDescriptorSize = curGamepad->deviceDescriptorSize;
// patch the config descriptor with the HID report descriptor size
my_usbDescriptorConfiguration[25] = rt_usbHidReportDescriptorSize;
usbReset();
usbInit();
set_sleep_mode(SLEEP_MODE_IDLE);
sei();
for(;;){ /* main event loop */
wdt_reset();
if (curGamepad->descriptorsChanged && curGamepad->descriptorsChanged()) {
goto reconnect;
}
// this must be called at each 50 ms or less
usbPoll();
if (mustPollControllers())
{
clrPollControllers();
sleep_enable();
sleep_cpu();
sleep_disable();
_delay_us(100);
curGamepad->update();
for (i=0; i<curGamepad->num_reports; i++) {
if (curGamepad->changed(i+1)) {
must_report |= (1<<i);
}
}
}
if(must_report)
{
for (i=0; i<curGamepad->num_reports; i++) {
int len;
if (!(must_report & (1<<i)))
continue;
len = curGamepad->buildReport(reportBuffer, i+1);
while(!usbInterruptIsReady()) {
usbPoll();
}
usbSetInterrupt(reportBuffer, len);
must_report &= ~(1<<i);
}
}
}
return 0;
}
/* ------------------------------------------------------------------------- */
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