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4nes4snes/usbdrv/usbdrv.c

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/* Name: usbdrv.c
* Project: AVR USB driver
* Author: Christian Starkjohann
* Creation Date: 2004-12-29
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: Proprietary, free under certain conditions. See Documentation.
* This Revision: $Id: usbdrv.c,v 1.1 2007-03-25 02:59:32 raph Exp $
*/
#include "iarcompat.h"
#ifndef __IAR_SYSTEMS_ICC__
# include <avr/io.h>
# include <avr/pgmspace.h>
#endif
#include "usbdrv.h"
#include "oddebug.h"
#include "../leds.h"
/*
General Description:
This module implements the C-part of the USB driver. See usbdrv.h for a
documentation of the entire driver.
*/
#ifndef IAR_SECTION
#define IAR_SECTION(arg)
#define __no_init
#endif
/* The macro IAR_SECTION is a hack to allow IAR-cc compatibility. On gcc, it
* is defined to nothing. __no_init is required on IAR.
*/
/* ------------------------------------------------------------------------- */
/* raw USB registers / interface to assembler code: */
/* usbRxBuf MUST be in 1 byte addressable range (because usbInputBuf is only 1 byte) */
__no_init uchar usbRxBuf[2][USB_BUFSIZE] __attribute__ ((section (USB_BUFFER_SECTION))) IAR_SECTION(USB_BUFFER_SECTION);/* raw RX buffer: PID, 8 bytes data, 2 bytes CRC */
uchar usbDeviceAddr; /* assigned during enumeration, defaults to 0 */
uchar usbNewDeviceAddr; /* device ID which should be set after status phase */
uchar usbConfiguration; /* currently selected configuration. Administered by driver, but not used */
uchar usbInputBuf; /* ptr to raw buffer used for receiving */
uchar usbAppBuf; /* ptr to raw buffer passed to app for processing */
volatile schar usbRxLen; /* = 0; number of bytes in usbAppBuf; 0 means free */
uchar usbCurrentTok; /* last token received */
uchar usbRxToken; /* token for data we received */
uchar usbMsgLen = 0xff; /* remaining number of bytes, no msg to send if -1 (see usbMsgPtr) */
volatile schar usbTxLen = -1; /* number of bytes to transmit with next IN token */
uchar usbTxBuf[USB_BUFSIZE];/* data to transmit with next IN, free if usbTxLen == -1 */
#if USB_CFG_HAVE_INTRIN_ENDPOINT
/* uchar usbRxEndp; endpoint which was addressed (1 bit in MSB) [not impl] */
volatile schar usbTxLen1 = -1; /* TX count for endpoint 1 */
uchar usbTxBuf1[USB_BUFSIZE];/* TX data for endpoint 1 */
#endif
uchar usbAckBuf[1] = {USBPID_ACK}; /* transmit buffer for ack tokens */
uchar usbNakBuf[1] = {USBPID_NAK}; /* transmit buffer for nak tokens */
/* USB status registers / not shared with asm code */
uchar *usbMsgPtr; /* data to transmit next -- ROM or RAM address */
static uchar usbMsgFlags; /* flag values see below */
static uchar usbIsReset; /* = 0; USB bus is in reset phase */
#define USB_FLG_TX_PACKET (1<<0)
/* Leave free 6 bits after TX_PACKET. This way we can increment usbMsgFlags to toggle TX_PACKET */
#define USB_FLG_MSGPTR_IS_ROM (1<<6)
#define USB_FLG_USE_DEFAULT_RW (1<<7)
/* Parameters that are configurable at runtime */
#ifdef USB_CFG_HID_REPORT_DESCRIPTOR_RUNTIME
const char *rt_usbHidReportDescriptor;
uchar rt_usbHidReportDescriptorSize;
#endif
#ifdef USB_CFG_DEVICE_DESCRIPTOR_RUNTIME
const char *rt_usbDeviceDescriptor;
uchar rt_usbDeviceDescriptorSize;
#endif
/*
optimizing hints:
- do not post/pre inc/dec integer values in operations
- assign value of PRG_RDB() to register variables and don't use side effects in arg
- use narrow scope for variables which should be in X/Y/Z register
- assign char sized expressions to variables to force 8 bit arithmetics
*/
/* ------------------------------------------------------------------------- */
#ifndef USB_CFG_DEVICE_DESCRIPTOR_RUNTIME
static PROGMEM char usbDescrDevice[] = { /* 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 */
USB_CFG_VENDOR_ID, /* 2 bytes */
USB_CFG_DEVICE_ID, /* 2 bytes */
USB_CFG_DEVICE_VERSION, /* 2 bytes */
#if USB_CFG_VENDOR_NAME_LEN
1, /* manufacturer string index */
#else
0, /* manufacturer string index */
#endif
#if USB_CFG_DEVICE_NAME_LEN
2, /* product string index */
#else
0, /* product string index */
#endif
#if USB_CFG_SERIAL_NUMBER_LENGTH
3, /* serial number string index */
#else
0, /* serial number string index */
#endif
1, /* number of configurations */
};
#endif
static PROGMEM char usbDescrConfig[] = { /* USB configuration descriptor */
9, /* sizeof(usbDescrConfig): length of descriptor in bytes */
USBDESCR_CONFIG, /* descriptor type */
(18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT
#if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH || defined(USB_CFG_HID_REPORT_DESCRIPTOR_RUNTIME)
+ 9
#endif
), 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_HID_REPORT_DESCRIPTOR_LENGTH || defined(USB_CFG_HID_REPORT_DESCRIPTOR_RUNTIME) /* 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 */
#ifndef USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH
0, /* substituted with real value on the fly in usbRead */
#else
USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH,
#endif
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 PROGMEM char usbDescrString0[] = { /* language descriptor */
4, /* sizeof(usbDescrString0): length of descriptor in bytes */
3, /* descriptor type */
0x09, 0x04, /* language index (0x0409 = US-English) */
};
#if USB_CFG_VENDOR_NAME_LEN
static PROGMEM int usbDescrString1[] = {
USB_STRING_DESCRIPTOR_HEADER(USB_CFG_VENDOR_NAME_LEN),
USB_CFG_VENDOR_NAME
};
#endif
#if USB_CFG_DEVICE_NAME_LEN
static PROGMEM int usbDescrString2[] = {
USB_STRING_DESCRIPTOR_HEADER(USB_CFG_DEVICE_NAME_LEN),
USB_CFG_DEVICE_NAME
};
#endif
/* We don't use prog_int or prog_int16_t for compatibility with various libc
* versions. Here's an other compatibility hack:
*/
#ifndef PRG_RDB
#define PRG_RDB(addr) pgm_read_byte(addr)
#endif
typedef union{
unsigned word;
uchar *ptr;
uchar bytes[2];
}converter_t;
/* We use this union to do type conversions. This is better optimized than
* type casts in gcc 3.4.3 and much better than using bit shifts to build
* ints from chars. Byte ordering is not a problem on an 8 bit platform.
*/
/* ------------------------------------------------------------------------- */
#if USB_CFG_HAVE_INTRIN_ENDPOINT
static uchar usbTxPacketCnt1;
#if USB_CFG_IMPLEMENT_HALT
static uchar usbHalted1; /* not 0 if endpoint 1 is halted */
#endif
void usbSetInterrupt(uchar *data, uchar len)
{
uchar *p, i;
#if USB_CFG_IMPLEMENT_HALT
if(usbHalted1)
return;
#endif
if(len > 8) /* interrupt transfers are limited to 8 bytes */
len = 8;
i = USBPID_DATA1;
if(usbTxPacketCnt1 & 1)
i = USBPID_DATA0;
if(usbTxLen1 < 0){ /* packet buffer was empty */
usbTxPacketCnt1++;
}else{
usbTxLen1 = -1; /* avoid sending incomplete interrupt data */
}
p = usbTxBuf1;
*p++ = i;
for(i=len;i--;)
*p++ = *data++;
usbCrc16Append(&usbTxBuf1[1], len);
usbTxLen1 = len + 4; /* len must be given including sync byte */
#if DEBUG_LEVEL > 1
DBG2(0x21, usbTxBuf1, usbTxLen1-1);
#else
DBG1(0x21, usbTxBuf1 + 1, 2);
#endif
}
#endif
static uchar usbRead(uchar *data, uchar len)
{
#if USB_CFG_IMPLEMENT_FN_READ
if(usbMsgFlags & USB_FLG_USE_DEFAULT_RW){
#endif
uchar i = len, *r = usbMsgPtr;
if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){ /* ROM data */
while(i--){
uchar c = PRG_RDB(r); /* assign to char size variable to enforce byte ops */
#ifdef USB_CFG_HID_REPORT_DESCRIPTOR_RUNTIME
if ((usbDescrConfig + 18 + 7) == (void*)r) {
*data++ = rt_usbHidReportDescriptorSize;
}
else {
*data++ = c;
}
#else
*data++ = c;
#endif
r++;
}
}else{ /* RAM data */
while(i--)
*data++ = *r++;
}
usbMsgPtr = r;
return len;
#if USB_CFG_IMPLEMENT_FN_READ
}else{
if(len != 0) /* don't bother app with 0 sized reads */
return usbFunctionRead(data, len);
return 0;
}
#endif
}
/* Don't make this function static to avoid inlining.
* The entire function would become too large and exceed the range of
* relative jumps.
* 2006-02-25: Either gcc 3.4.3 is better than the gcc used when the comment
* above was written, or other parts of the code have changed. We now get
* better results with an inlined function. Test condition: PowerSwitch code.
*/
static void usbProcessRx(uchar *data, uchar len)
{
usbRequest_t *rq = (void *)data;
uchar replyLen = 0, flags = USB_FLG_USE_DEFAULT_RW;
/* We use if() cascades because the compare is done byte-wise while switch()
* is int-based. The if() cascades are therefore more efficient.
*/
#if DEBUG_LEVEL > 1
DBG2(0x10 + (usbRxToken == (uchar)USBPID_SETUP), data, len);
#else
DBG1(0x10 + (usbRxToken == (uchar)USBPID_SETUP), data, 2);
#endif
if(usbRxToken == (uchar)USBPID_SETUP){
if(len == 8){ /* Setup size must be always 8 bytes. Ignore otherwise. */
uchar type = rq->bmRequestType & USBRQ_TYPE_MASK;
if(type == USBRQ_TYPE_STANDARD){
uchar *replyData = usbTxBuf + 9; /* there is 3 bytes free space at the end of the buffer */
replyData[0] = 0; /* common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */
if(rq->bRequest == USBRQ_GET_STATUS){ /* 0 */
uchar __attribute__((__unused__)) recipient = rq->bmRequestType & USBRQ_RCPT_MASK; /* assign arith ops to variables to enforce byte size */
#if USB_CFG_IS_SELF_POWERED
if(recipient == USBRQ_RCPT_DEVICE)
replyData[0] = USB_CFG_IS_SELF_POWERED;
#endif
#if USB_CFG_HAVE_INTRIN_ENDPOINT && USB_CFG_IMPLEMENT_HALT
if(usbHalted1 && recipient == USBRQ_RCPT_ENDPOINT && rq->wIndex.bytes[0] == 0x81) /* request status for endpoint 1 */
replyData[0] = 1;
#endif
replyData[1] = 0;
replyLen = 2;
}else if(rq->bRequest == USBRQ_SET_ADDRESS){ /* 5 */
usbNewDeviceAddr = rq->wValue.bytes[0];
}else if(rq->bRequest == USBRQ_GET_DESCRIPTOR){ /* 6 */
flags = USB_FLG_MSGPTR_IS_ROM | USB_FLG_USE_DEFAULT_RW;
if(rq->wValue.bytes[1] == 1){ /* descriptor type requested */
#ifndef USB_CFG_DEVICE_DESCRIPTOR_RUNTIME
replyLen = sizeof(usbDescrDevice);
replyData = (uchar *)usbDescrDevice;
#else
replyLen = rt_usbDeviceDescriptorSize;
replyData = (uchar *)rt_usbDeviceDescriptor;
#endif
}else if(rq->wValue.bytes[1] == 2){
replyLen = sizeof(usbDescrConfig);
replyData = (uchar *)usbDescrConfig;
}else if(rq->wValue.bytes[1] == 3){ /* string descriptor */
if(rq->wValue.bytes[0] == 0){ /* descriptor index */
replyLen = sizeof(usbDescrString0);
replyData = (uchar *)usbDescrString0;
#if USB_CFG_VENDOR_NAME_LEN
}else if(rq->wValue.bytes[0] == 1){
replyLen = sizeof(usbDescrString1);
replyData = (uchar *)usbDescrString1;
#endif
#if USB_CFG_DEVICE_NAME_LEN
}else if(rq->wValue.bytes[0] == 2){
replyLen = sizeof(usbDescrString2);
replyData = (uchar *)usbDescrString2;
#endif
#if USB_CFG_SERIAL_NUMBER_LENGTH
}else if(rq->wValue.bytes[0] == 3){
replyLen = 2 * USB_CFG_SERIAL_NUMBER_LENGTH + 2;
replyData = (uchar *)usbCfgSerialNumberStringDescriptor;
#endif
}
}
#if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH || defined(USB_CFG_HID_REPORT_DESCRIPTOR_RUNTIME)
else if(rq->wValue.bytes[1] == USBDESCR_HID){ /* 0x21 */
replyLen = 9;
replyData = (uchar *)usbDescrConfig + 18;
}else if(rq->wValue.bytes[1] == USBDESCR_HID_REPORT){ /* 0x22 */
#ifdef USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH
replyLen = USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH;
replyData = (uchar *)usbHidReportDescriptor;
#endif
#ifdef USB_CFG_HID_REPORT_DESCRIPTOR_RUNTIME
replyLen = rt_usbHidReportDescriptorSize;
replyData = (uchar *)rt_usbHidReportDescriptor;
//replyData = snes_usbHidReportDescriptor;
// if (replyData != (void*)0x86) { LED_ON(); }
// if (replyLen != 42) { LED_ON(); }
#endif
}
#endif
}else if(rq->bRequest == USBRQ_GET_CONFIGURATION){ /* 8 */
replyLen = 1;
replyData = &usbConfiguration; /* send current configuration value */
}else if(rq->bRequest == USBRQ_SET_CONFIGURATION){ /* 9 */
usbConfiguration = rq->wValue.bytes[0];
#if USB_CFG_IMPLEMENT_HALT
usbHalted1 = 0;
#endif
}else if(rq->bRequest == USBRQ_GET_INTERFACE){ /* 10 */
replyLen = 1;
#if USB_CFG_HAVE_INTRIN_ENDPOINT
#if USB_CFG_IMPLEMENT_HALT
}else if(rq->bRequest == USBRQ_CLEAR_FEATURE || rq->bRequest == USBRQ_SET_FEATURE){ /* 1|3 */
if(rq->wValue.bytes[0] == 0 && rq->wIndex.bytes[0] == 0x81){ /* feature 0 == HALT for endpoint == 1 */
usbHalted1 = rq->bRequest - 1;
if(usbHalted1){
usbTxBuf1[0] = USBPID_STALL;
usbTxLen1 = 2; /* length including sync byte */
}
usbTxPacketCnt1 = 0; /* reset data toggling for interrupt endpoint */
}
#endif
}else if(rq->bRequest == USBRQ_SET_INTERFACE){ /* 11 */
usbTxPacketCnt1 = 0; /* reset data toggling for interrupt endpoint */
#if USB_CFG_IMPLEMENT_HALT
usbHalted1 = 0;
#endif
#endif
}else{
/* the following requests can be ignored, send default reply */
/* 1: CLEAR_FEATURE, 3: SET_FEATURE, 7: SET_DESCRIPTOR */
/* 12: SYNCH_FRAME */
}
usbMsgPtr = replyData;
if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0]) /* max length is in */
replyLen = rq->wLength.bytes[0];
}else{ /* not a standard request -- must be vendor or class request */
replyLen = usbFunctionSetup(data);
#if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE
if(replyLen == 0xff){ /* use user-supplied read/write function */
if((rq->bmRequestType & USBRQ_DIR_MASK) == USBRQ_DIR_DEVICE_TO_HOST){
replyLen = rq->wLength.bytes[0]; /* IN transfers only */
}
flags = 0; /* we have no valid msg, use user supplied read/write functions */
}
#endif
}
}
/* make sure that data packets which are sent as ACK to an OUT transfer are always zero sized */
}else{ /* DATA packet from out request */
#if USB_CFG_IMPLEMENT_FN_WRITE
if(!(usbMsgFlags & USB_FLG_USE_DEFAULT_RW)){
uchar rval = usbFunctionWrite(data, len);
replyLen = 0xff;
if(rval == 0xff){ /* an error occurred */
/* usbMsgLen = 0xff; cancel potentially pending ACK [has been done by ASM module when OUT token arrived] */
usbTxBuf[0] = USBPID_STALL;
usbTxLen = 2; /* length including sync byte */
}else if(rval != 0){ /* This was the final package */
replyLen = 0; /* answer with a zero-sized data packet */
}
flags = 0; /* start with a DATA1 package, stay with user supplied write() function */
}
#else
replyLen = 0; /* send zero-sized block as ACK */
#endif
}
usbMsgFlags = flags;
usbMsgLen = replyLen;
}
/* ------------------------------------------------------------------------- */
static void usbBuildTxBlock(void)
{
uchar wantLen, len, txLen, token;
wantLen = usbMsgLen;
if(wantLen > 8)
wantLen = 8;
usbMsgLen -= wantLen;
token = USBPID_DATA1;
if(usbMsgFlags & USB_FLG_TX_PACKET)
token = USBPID_DATA0;
usbMsgFlags++;
len = usbRead(usbTxBuf + 1, wantLen);
if(len <= 8){ /* valid data packet */
usbCrc16Append(usbTxBuf + 1, len);
txLen = len + 4; /* length including sync byte */
if(len < 8) /* a partial package identifies end of message */
usbMsgLen = 0xff;
}else{
token = USBPID_STALL;
txLen = 2; /* length including sync byte */
usbMsgLen = 0xff;
}
usbTxBuf[0] = token;
usbTxLen = txLen;
#if DEBUG_LEVEL > 1
DBG2(0x20, usbTxBuf, txLen-1);
#else
DBG1(0x20, usbTxBuf + 1, 2);
#endif
}
static inline uchar isNotSE0(void)
{
uchar rval;
/* We want to do
* return (USBIN & USBMASK);
* here, but the compiler does int-expansion acrobatics.
* We can avoid this by assigning to a char-sized variable.
*/
rval = USBIN & USBMASK;
return rval;
}
/* ------------------------------------------------------------------------- */
void usbPoll(void)
{
uchar len;
if((len = usbRxLen) > 0){
/* We could check CRC16 here -- but ACK has already been sent anyway. If you
* need data integrity checks with this driver, check the CRC in your app
* code and report errors back to the host. Since the ACK was already sent,
* retries must be handled on application level.
* unsigned crc = usbCrc16((uchar *)(unsigned)(usbAppBuf + 1), usbRxLen - 3);
*/
len -= 3; /* remove PID and CRC */
if(len < 128){ /* no overflow */
converter_t appBuf;
appBuf.ptr = (uchar *)usbRxBuf;
appBuf.bytes[0] = usbAppBuf;
appBuf.bytes[0]++;
usbProcessRx(appBuf.ptr, len);
}
usbRxLen = 0; /* mark rx buffer as available */
}
if(usbMsgLen != 0xff){ /* transmit data pending? */
if(usbTxLen < 0) /* transmit system idle */
usbBuildTxBlock();
}
if(isNotSE0()){ /* SE0 state */
usbIsReset = 0;
}else{
/* check whether SE0 lasts for more than 2.5us (3.75 bit times) */
if(!usbIsReset){
uchar i;
for(i=100;i;i--){
if(isNotSE0())
goto notUsbReset;
}
usbIsReset = 1;
usbNewDeviceAddr = 0;
usbDeviceAddr = 0;
#if USB_CFG_IMPLEMENT_HALT
usbHalted1 = 0;
#endif
DBG1(0xff, 0, 0);
notUsbReset:;
}
}
}
/* ------------------------------------------------------------------------- */
void usbInit(void)
{
usbInputBuf = (uchar)usbRxBuf[0];
usbAppBuf = (uchar)usbRxBuf[1];
#if USB_INTR_CFG_SET != 0
USB_INTR_CFG |= USB_INTR_CFG_SET;
#endif
#if USB_INTR_CFG_CLR != 0
USB_INTR_CFG &= ~(USB_INTR_CFG_CLR);
#endif
USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT);
}
/* ------------------------------------------------------------------------- */
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