📄 usb.c
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/****************************/
/* 处理 SET_DESCRIPTOR 请求 */
/****************************/
/*以下是Set Descriptor的叙述:
This request may be used to updata existing descriptors or new descriptors may be used.
------------------------------------------------------------------------
|bmRequestType| bRequest | wValue | wIndex | wLength | Data |
|=============+==============+==========+========+==========+==========|
| 00000000B |SET_DESCRIPTOR|Descriptor|Zero or |Descriptor|Descriptor|
| | |Type and |Language| Length | |
| | |Descriptor|ID | | |
| | |Index | | | |
------------------------------------------------------------------------
The wValue field specifies the descriptor type in the high byte and the descriptor index
in the low byte.The wIndex field specifies the Language ID for string descriptor or reset to
zero for other descriptor.The wLength field specifies the number of bytes to transfer from the
host to the device.
If this request is not supported then the device will respond with a Request Error.
*/
void setdescriptor(void)//OK
{}
/*******************************/
/* 处理 GET_CONFIGURATION 请求 */
/*******************************/
/*以下是Get Configuration的叙述:
This request returns the current device configuration value.
|--------------------------------------------------------------------
|bmRequestType| bRequest |wValue|wIndex|wLength| Data |
|=============+=================+======+======+=======+=============|
| 10000000B |GET_CONFIGURATION| Zero | Zero | One |Configuration|
| | | | | | Value |
---------------------------------------------------------------------
If the returned value is Zero,the device is not configured.
If wValue,wIndex,or wLength are not as specified above the the
device behavior is not specified.
*/
void getconfiguration(void)//OK
{
write_usb(TXD0,usb_cfg);/*load the config val */
}
/*******************************/
/* 处理 SET_CONFIGURATION 请求 */
/*******************************/
/*以下是Set Configuration的叙述:
This request sets the device configuration.
|------------------------------------------------------------------
|bmRequestType| bRequest | wValue |wIndex|wLength|Data|
|=============+=================+=============+======+=======+====|
| 00000000B |SET_CONFIGURATION|Configuration| Zero | Zero |None|
| | | Value | | | |
-------------------------------------------------------------------
The low byte of the wValue field specifies the desired configuration.
This configuration value must be zero or match a configuration value
from a configuration descriptor.If the configuration value is zero,the
deviced is placed in its Address state.The upper byte of the wValue field
is reserved.
If wIndex,wLength,or the upper byte of wValue is non-zero,the the
behavior of this request is not specified.
*/
void setconfiguration(void)//OK
{
usb_cfg = SetupData.wValue.ByteValue.Low; /*set the configuration # */
if (SetupData.wValue.ByteValue.Low!=0) /*set the configuration */
{
dtapid = 0; /*FIRST PID is DATA0 */
stalld = 0; /*nothing stalled */
/*此处各EP的number必须同CFG_DESC表中的描述一致*/
FLUSHTX1; /*flush TX1 and disable */
write_usb(EPC1,EP_EN+01); /*enable EP1 at adr 1 */
FLUSHRX1; /*flush RX1 and disable */
write_usb(EPC2,EP_EN+01); /*enable EP2 at adr 1 */
write_usb(RXC1,RX_EN); /*enable RX1 */
FLUSHTX2; /*flush TX2 and disable */
write_usb(EPC3,EP_EN+02); /*enable EP3 at adr 2 */
FLUSHRX2; /*flush RX2 and disable */
write_usb(EPC4,EP_EN+02); /*enable EP4 at adr 2 */
write_usb(RXC2,RX_EN); /*enable RX2 */
FLUSHTX3; /*flush TX1 and disable */
write_usb(EPC5,EP_EN+03); /*enable EP5 at adr 3 */
FLUSHRX3; /*flush RX3 and disable */
write_usb(EPC6,EP_EN+03); /*enable EP6 at adr 3 */
write_usb(RXC3,RX_EN); /*enable RX3 */
}
else /*unconfigure the device */
{
write_usb(EPC1,0); /*disable EP1 */
write_usb(EPC2,0); /*disable EP2 */
write_usb(EPC3,0); /*disable EP3 */
write_usb(EPC4,0); /*disable EP4 */
write_usb(EPC5,0); /*disable EP5 */
write_usb(EPC6,0); /*disable EP6 */
}
}
/************************************/
/* USB EndPoint0(FIFO0)接收处理程序 */
/************************************/
void rx_0(void)
{
rxstat=read_usb(RXS0); /*get Receive Status register for the bidirectional Control Endpoint 0*/
if(rxstat & SETUP_R) /*若为SETUP Token Packet*/
{
/*将数据读入缓冲区，然后清除并禁止RX*/
/*从FIFO读取数据至usb_buf*/
SetupData.bmRequestType =read_usb(RXD0);/*Offset 0*/
SetupData.bRequest =read_usb(RXD0);/*1*/
SetupData.wValue.ByteValue.Low =read_usb(RXD0);/*2*/
SetupData.wValue.ByteValue.High =read_usb(RXD0);/*3*/
SetupData.wIndex.ByteValue.Low =read_usb(RXD0);/*4*/
SetupData.wIndex.ByteValue.High =read_usb(RXD0);/*5*/
SetupData.wLength.ByteValue.Low =read_usb(RXD0);/*6*/
SetupData.wLength.ByteValue.High=read_usb(RXD0);/*7*/
FLUSHRX0; /*make sure the RX is off */
FLUSHTX0; /*make sure the TX is off */
bitclr(EPC0,STALL); /*turn off stall */
switch (SetupData.bmRequestType&0x60) /*屏蔽D7,D4~D0位,解读bmRequestType*/
{
case 0x00: /*bmRequestType=standard request*/
switch (SetupData.bRequest) /*解读bRequest类型*/
{
case GET_STATUS: /*bRequest=0*/
getstatus();
break;
case CLEAR_FEATURE: /*bRequest=1*/
clrfeature();
break;
case 0x02: /*bRequest=2->Reserved for future use*/
break;
case SET_FEATURE: /*bRequest=3*/
setfeature();
break;
case 0x04: /*bRequest=4->Reserved for future use*/
break;
case SET_ADDRESS: /*bRequest=5*/
setaddress();
break;
case GET_DESCRIPTOR: /*bRequest=6*/
getdescriptor();
break;
case SET_DESCRIPTOR: /*bRequest=7*/
setdescriptor();
break;
case GET_CONFIGURATION: /*bRequest=8*/
getconfiguration();
break;
case SET_CONFIGURATION: /*bRequest=9*/
setconfiguration();
break;
case GET_INTERFACE: /*bRequest=10*/
getinterface();
break;
case SET_INTERFACE: /*bRequest=11*/
setinterface();
break;
case SYNCH_FRAME: /*bRequest=12->unsupported standard req*/
synchframe();
break;
default: /*unsupported request type*/
bitset(EPC0,STALL); /*stall the endpoint */
break;
}
/*the following is done for all setup packets. Note that if*/
/*no data was stuffed into the FIFO, the result of the */
/*following will be a zero-length response. */
write_usb(TXC0,TX_TOGL+TX_EN); /*enable the TX (DATA1) */
CLRBIT(dtapid,TGL0PID); /*store NEXT PID state */
break;
case 0x40:
switch (SetupData.bRequest)
{
case SEND_COMMAND:
sendcommand();
write_usb(RXC0,RX_EN); /*enable the RX */
break;
case READ_STATUS:
readstatus();
write_usb(TXC0, TX_TOGL+TX_EN); /*enable the TX (DATA1) */
CLRBIT(dtapid,TGL0PID); /*store NEXT PID state */
break;
default: /*unsupported standard req*/
bitset(EPC0,STALL); /*stall the endpoint */
break;
}
break;
default: /*bmRequestType=Vendor,Reserved*/
/* or other unsupported request type*/
bitset(EPC0,STALL); /*stall the endpoint */
break;
}
/*the following is done for all setup packets. Note that if*/
/*no data was stuffed into the FIFO, the result of the */
/*following will be a zero-length response. */
// write_usb(TXC0,TX_TOGL+TX_EN); /*enable the TX (DATA1) */
// CLRBIT(dtapid,TGL0PID); /*store NEXT PID state */
}
/*若不是SETUP Token Packet，那么就必定是一个OUT packet*/
/*注意：由于在RXS0中没有RX_ERR 位，因此没有必要象对待其它的RX event*/
/*一样对待EndPoint0(FIFO0)接收事件*/
else
{
/*multi-pkt and getdesc or readsta status stage? */
if(TSTBIT(status,GETDESC)||TSTBIT(status,READSTA))
{
/*test for errors (zero length, correct PID) */
if ((rxstat& 0x5F)!=0x10) /*length error?? */
{}
if(TSTBIT(status,GETDESC)) /*exit multi-packet mode */
CLR_GETDESC;
if(TSTBIT(status,READSTA))
CLR_READSTA;
FLUSHTX0; /*flush TX0 and disable */
write_usb(RXC0,RX_EN); /*re-enable the receiver */
}
else
{
if(TSTBIT(status,SENDCMD))
{
int i;
for(i = 0; i < 8; i++)
cmd_buf[cmd_sze++] = read_usb(RXD0);
if(cmd_sze == 64)
{
//CLR_MLTIPKT; /*exit multi-packet mode */
CLR_SENDCMD;
switch(cmd_buf[0])
{
case FORMAT: //finish
format_disk();
usb_status = 0xFF;
break;
case ROOT:
root_information();
TXEN1_PID;
break;
case MEM:
memory_size();
TXEN1_PID;
break;
case DOWNLOAD_FILE:
download_file();
break;
case UPLOAD_FI:
upload_file();
TXEN1_PID;
break;
case RENAME:
file_rename((U8 *)&cmd_buf[10]);
usb_status = 0xFF;
break;
case DEL:
del_file((U8 *)&cmd_buf[10]);
usb_status = 0xFF;
break;
}
//CLR_MLTIPKT; /*exit multi-packet mode */
/* status stage */
FLUSHRX0;
write_usb(TXC0,TX_TOGL+TX_EN); /*enable the TX (DATA1) */
write_usb(RXC0,RX_EN);
}
else
{
FLUSHTX0;
FLUSHRX0;
write_usb(RXC0,RX_EN); /*enable RX */
}
}
}
}
/*we do this stuff for all rx_0 events **************************/
}
/**********************************************************************/
/* This subroutine handles RX events for FIFO1 (endpoint 2) */
/**********************************************************************/
void rx_1(void)
{
int i=0;
rxstat=read_usb(RXS1); /*get receiver status */
if(rxstat & SETUP_R)
{}
else if (rxstat & RX_ERR)
{}
else
{
if( TSTBIT(status, DOWNLOAD) ) //download state
{
if(File2Sdram==1)
{
for(i=0;i<64;i++)
{
*downPt++=read_usb(RXD1);
total++;
}
if(total%512==0)
{
n_size--;
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