mirror of
https://github.com/raphnet/4nes4snes
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340 lines
8.7 KiB
C
340 lines
8.7 KiB
C
/* Name: main.c
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* Project: Multiple NES/SNES to USB converter
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* Author: Raphael Assenat <raph@raphnet.net>
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* Copyright: (C) 2007-2009 Raphael Assenat <raph@raphnet.net>
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* License: GPLv2
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* Tabsize: 4
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* Comments: Based on HID-Test by Christian Starkjohann
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include <avr/wdt.h>
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#include <util/delay.h>
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#include <string.h>
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#include "usbdrv.h"
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#include "gamepad.h"
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#include "fournsnes.h"
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#include "devdesc.h"
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static uchar *rt_usbHidReportDescriptor=NULL;
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static uchar rt_usbHidReportDescriptorSize=0;
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static uchar *rt_usbDeviceDescriptor=NULL;
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static uchar rt_usbDeviceDescriptorSize=0;
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#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168A__) || \
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defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328__) || \
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defined(__AVR_ATmega328P__) || defined(__AVR_ATmega88__) || \
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defined(__AVR_ATmega88A__) || defined(__AVR_ATmega88P__) || \
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defined(__AVR_ATmega88PA__)
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#define AT168_COMPATIBLE
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#endif
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/* The maximum number of independent reports that are supported. */
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#define MAX_REPORTS 8
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const PROGMEM int usbDescriptorStringSerialNumber[] = {
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USB_STRING_DESCRIPTOR_HEADER(4),
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'1','0','0','0'
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};
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int usbDescriptorStringDevice[] = {
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USB_STRING_DESCRIPTOR_HEADER(DEVICE_STRING_LENGTH),
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DEFAULT_PROD_STRING
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};
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char usbDescriptorConfiguration[] = { 0 }; // dummy
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uchar my_usbDescriptorConfiguration[] = { /* USB configuration descriptor */
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9, /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */
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USBDESCR_CONFIG, /* descriptor type */
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18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + 9, 0,
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/* total length of data returned (including inlined descriptors) */
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1, /* number of interfaces in this configuration */
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1, /* index of this configuration */
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0, /* configuration name string index */
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#if USB_CFG_IS_SELF_POWERED
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USBATTR_SELFPOWER, /* attributes */
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#else
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USBATTR_BUSPOWER, /* attributes */
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#endif
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USB_CFG_MAX_BUS_POWER/2, /* max USB current in 2mA units */
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/* interface descriptor follows inline: */
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9, /* sizeof(usbDescrInterface): length of descriptor in bytes */
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USBDESCR_INTERFACE, /* descriptor type */
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0, /* index of this interface */
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0, /* alternate setting for this interface */
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USB_CFG_HAVE_INTRIN_ENDPOINT, /* endpoints excl 0: number of endpoint descriptors to follow */
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USB_CFG_INTERFACE_CLASS,
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USB_CFG_INTERFACE_SUBCLASS,
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USB_CFG_INTERFACE_PROTOCOL,
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0, /* string index for interface */
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//#if (USB_CFG_DESCR_PROPS_HID & 0xff) /* HID descriptor */
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9, /* sizeof(usbDescrHID): length of descriptor in bytes */
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USBDESCR_HID, /* descriptor type: HID */
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0x01, 0x01, /* BCD representation of HID version */
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0x00, /* target country code */
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0x01, /* number of HID Report (or other HID class) Descriptor infos to follow */
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0x22, /* descriptor type: report */
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USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0, /* total length of report descriptor */
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//#endif
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#if USB_CFG_HAVE_INTRIN_ENDPOINT /* endpoint descriptor for endpoint 1 */
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7, /* sizeof(usbDescrEndpoint) */
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USBDESCR_ENDPOINT, /* descriptor type = endpoint */
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0x81, /* IN endpoint number 1 */
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0x03, /* attrib: Interrupt endpoint */
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8, 0, /* maximum packet size */
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USB_CFG_INTR_POLL_INTERVAL, /* in ms */
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#endif
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};
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static Gamepad *curGamepad;
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/* ----------------------- hardware I/O abstraction ------------------------ */
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static void hardwareInit(void)
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{
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/* PORTB
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*
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* Bit Description Direction Level/pu
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* 0 Jumpers common Out 0
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* 1 JP1 In 1
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* 2 JP2 In 1
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* 3 MOSI In 1
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* 4 MISO In 1
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* 5 SCK In 1
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* 6 -
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* 7 -
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*/
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DDRB = 0x01;
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PORTB = 0xFE;
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// init port C as input with pullup
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DDRC = 0x00;
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PORTC = 0xff;
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/*
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* For port D, activate pull-ups on all lines except the D+, D- and bit 1.
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*
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* For historical reasons (a mistake on an old PCB), bit 1
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* is now always connected with bit 0. So bit 1 configured
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* as an input without pullup.
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*
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* Usb pin are init as output, low. (device reset). They are released
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* later when usbReset() is called.
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*/
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PORTD = 0xf8;
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DDRD = 0x01 | 0x04;
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/* Configure timers */
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#if defined(AT168_COMPATIBLE)
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TCCR2A= (1<<WGM21);
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TCCR2B=(1<<CS22)|(1<<CS21)|(1<<CS20);
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OCR2A=196; // for 60 hz
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#else
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TCCR2 = (1<<WGM21)|(1<<CS22)|(1<<CS21)|(1<<CS20);
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OCR2 = 196; // for 60 hz
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#endif
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}
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static void usbReset(void)
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{
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/* [...] a single ended zero or SE0 can be used to signify a device
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reset if held for more than 10mS. A SE0 is generated by holding
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both th D- and D+ low (< 0.3V).
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*/
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PORTD &= ~(0x01 | 0x04); // Set D+ and D- to 0
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DDRD |= 0x01 | 0x04;
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_delay_ms(15);
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DDRD &= ~(0x01 | 0x04);
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}
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#if defined(AT168_COMPATIBLE)
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#define mustPollControllers() (TIFR2 & (1<<OCF2A))
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#define clrPollControllers() do { TIFR2 = 1<<OCF2A; } while(0)
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#else
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#define mustPollControllers() (TIFR & (1<<OCF2))
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#define clrPollControllers() do { TIFR = 1<<OCF2; } while(0)
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#endif
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static uchar reportBuffer[12]; /* buffer for HID reports */
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/* ------------------------------------------------------------------------- */
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/* ----------------------------- USB interface ----------------------------- */
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/* ------------------------------------------------------------------------- */
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uchar usbFunctionDescriptor(struct usbRequest *rq)
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{
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if ((rq->bmRequestType & USBRQ_TYPE_MASK) != USBRQ_TYPE_STANDARD)
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return 0;
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if (rq->bRequest == USBRQ_GET_DESCRIPTOR)
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{
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// USB spec 9.4.3, high byte is descriptor type
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switch (rq->wValue.bytes[1])
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{
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case USBDESCR_DEVICE:
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usbMsgPtr = rt_usbDeviceDescriptor;
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return rt_usbDeviceDescriptorSize;
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case USBDESCR_HID_REPORT:
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usbMsgPtr = rt_usbHidReportDescriptor;
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return rt_usbHidReportDescriptorSize;
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case USBDESCR_CONFIG:
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usbMsgPtr = my_usbDescriptorConfiguration;
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return sizeof(my_usbDescriptorConfiguration);
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}
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}
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return 0;
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}
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static uchar reportPos=0;
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uchar usbFunctionSetup(uchar data[8])
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{
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usbRequest_t *rq = (void *)data;
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usbMsgPtr = reportBuffer;
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/* class request type */
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if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){
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switch (rq->bRequest)
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{
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case USBRQ_HID_GET_REPORT:
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/* wValue: ReportType (highbyte), ReportID (lowbyte) */
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reportPos=0;
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return curGamepad->buildReport(reportBuffer, rq->wValue.bytes[0]);
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}
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} else {
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/* no vendor specific requests implemented */
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}
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return 0;
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}
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/* ------------------------------------------------------------------------- */
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int main(void)
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{
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char must_report = 0; /* bitfield */
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int i;
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unsigned char run_mode;
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hardwareInit();
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_delay_ms(10); /* let pins settle */
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run_mode = (PINB & 0x06)>>1;
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switch(run_mode)
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{
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// Close JP1 to disable live auto-detect
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case 2:
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disableLiveAutodetect();
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break;
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case 1:
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case 3:
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case 4:
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break;
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}
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curGamepad = fournsnesGetGamepad();
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// configure report descriptor according to
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// the current gamepad
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rt_usbHidReportDescriptor = curGamepad->reportDescriptor;
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rt_usbHidReportDescriptorSize = curGamepad->reportDescriptorSize;
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if (curGamepad->deviceDescriptor != 0)
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{
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rt_usbDeviceDescriptor = (void*)curGamepad->deviceDescriptor;
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rt_usbDeviceDescriptorSize = curGamepad->deviceDescriptorSize;
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}
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else
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{
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// use descriptor from devdesc.c
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//
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rt_usbDeviceDescriptor = (void*)usbDescrDevice;
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rt_usbDeviceDescriptorSize = getUsbDescrDevice_size();
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}
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// patch the config descriptor with the HID report descriptor size
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my_usbDescriptorConfiguration[25] = rt_usbHidReportDescriptorSize;
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usbReset();
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curGamepad->init();
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usbInit();
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curGamepad->update();
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sei();
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for(;;){ /* main event loop */
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wdt_reset();
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// this must be called at each 50 ms or less
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usbPoll();
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/* Read the controllers at 60hz */
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if (mustPollControllers())
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{
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clrPollControllers();
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curGamepad->update();
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/* Check what will have to be reported */
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for (i=0; i<curGamepad->num_reports; i++) {
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if (curGamepad->changed(i+1)) {
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must_report |= (1<<i);
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}
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}
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}
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if(must_report)
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{
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for (i = 0; i < curGamepad->num_reports; i++)
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{
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if ((must_report & (1<<i)) == 0)
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continue;
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if (usbInterruptIsReady())
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{
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char len;
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len = curGamepad->buildReport(reportBuffer, i+1);
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usbSetInterrupt(reportBuffer, len);
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while (!usbInterruptIsReady())
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{
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usbPoll();
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wdt_reset();
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}
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}
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}
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must_report = 0;
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}
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}
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return 0;
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}
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/* ------------------------------------------------------------------------- */
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