共享某網(wǎng)友CH375做HOST的程序，暫時(shí)可以和slaver通訊
/***************************************
** USB 1.1 Host for CH375 **
** 單片機(jī)用89C51 **
****************************************/
/* 如果設(shè)備端不是CH37X,那么分析描述符 */
/* CH375中斷為查詢方式 */
#include <string.h>
#include <stdio.h>
#include <intrins.h>
#include <reg51.h>
#include "CH375INC.H"
#define DELAY_START_value 1 /* 根據(jù)單片機(jī)的時(shí)鐘選擇延時(shí)初值 */
#define UNKNOWN_USB_DEVICE 0xF1
#define USB_INT_RET_NAK 0x2A /* 00101010B,返回NAK */
typedef struct _USB_DEVICE_DESCRIPTOR {
unsigned char bLength;
unsigned char bDescriptorType;
unsigned short bcdUSB;
unsigned char bDeviceClass;
unsigned char bDeviceSubClass;
unsigned char bDeviceProtocol;
unsigned char bMaxPacketSize0;
unsigned short idVendor;
unsigned short idProduct;
unsigned short bcdDevice;
unsigned char iManufacturer;
unsigned char iProduct;
unsigned char iSerialNumber;
unsigned char bNumConfigurations;
} USB_DEV_DESCR, *PUSB_DEV_DESCR;
typedef struct _USB_CONFIG_DESCRIPTOR {
unsigned char bLength;
unsigned char bDescriptorType;
unsigned short wTotalLength;
unsigned char bNumInterfaces;
unsigned char bConfigurationvalue;
unsigned char iConfiguration;
unsigned char bmAttributes;
unsigned char MaxPower;
} USB_CFG_DESCR, *PUSB_CFG_DESCR;
typedef struct _USB_INTERF_DESCRIPTOR {
unsigned char bLength;
unsigned char bDescriptorType;
unsigned char bInterfaceNumber;
unsigned char bAlternateSetting;
unsigned char bNumEndpoints;
unsigned char bInterfaceClass;
unsigned char bInterfaceSubClass;
unsigned char bInterfaceProtocol;
unsigned char iInterface;
} USB_ITF_DESCR, *PUSB_ITF_DESCR;
typedef struct _USB_ENDPOINT_DESCRIPTOR {
unsigned char bLength;
unsigned char bDescriptorType;
unsigned char bEndpointAddress;
unsigned char bmAttributes;
unsigned short wMaxPacketSize;
unsigned char bInterval;
} USB_ENDP_DESCR, *PUSB_ENDP_DESCR;
typedef struct _USB_CONFIG_DESCRIPTOR_LONG {
USB_CFG_DESCR cfg_descr;
USB_ITF_DESCR itf_descr;
USB_ENDP_DESCR endp_descr[4];
} USB_CFG_DESCR_LONG, *PUSB_CFG_DESCR_LONG;
unsigned char RECV_LEN; /* 剛接收到的數(shù)據(jù)的長度 */
unsigned char idata RECV_BUFFER[ CH375_MAX_DATA_LEN ]; /* 數(shù)據(jù)緩沖區(qū),用于保存接收到的下傳數(shù)據(jù),長度為0到64字節(jié) */
unsigned char idata *cmd_buf;
unsigned char idata *ret_buf;
#define p_dev_descr ((PUSB_DEV_DESCR)RECV_BUFFER)
#define p_cfg_descr ((PUSB_CFG_DESCR_LONG)RECV_BUFFER)
unsigned char endp_out_addr; /* USB數(shù)據(jù)接收端點(diǎn)的端點(diǎn)地址 */
unsigned char endp_out_size; /* USB數(shù)據(jù)接收端點(diǎn)的端點(diǎn)尺寸 */
unsigned char endp_in_addr; /* USB狀態(tài)發(fā)送端點(diǎn)的端點(diǎn)地址,為0則只支持單向接口 */
unsigned char endp6_mode, endp7_mode;
/*
Ch375與51等的連接
CH375 51
D0 P1.0
. .
. .
. .
D7 P1.7
A0 P3.7
RD P3.5
WR P3.4
CS 接地
INT P3.2(int0)
*/
#define CH375_DATA_PORT P1 /* CH375端口的I/O地址 */
sbit CH375_CMD_DAT = P3^7; /* CH375地址線輸入A0，A0=1時(shí)寫命令，A0=0時(shí)讀寫數(shù)據(jù) */
sbit CH375_RD = P3^5; /* CH375讀選通輸入，低電平有效 */
sbit CH375_WR = P3^4; /* CH375寫選通輸入，低電平有效 */
sbit led = P3^3; /* 指示燈 */
sbit CH375_INT_WIRE = P3^2; /* CH375中斷請(qǐng)求輸出，低電平有效 */
void delay50ms(void);
void delay1s(void);
void flash_led(void);
void CH375_WR_CMD_PORT( unsigned char cmd );
void CH375_WR_DAT_PORT( unsigned char dat );
unsigned char CH375_RD_DAT_PORT(void);
unsigned char wait_interrupt(void);
void set_usb_mode( unsigned char mode );
void toggle_recv(void);
void toggle_send(void);
unsigned char clr_stall6( void);
unsigned char clr_stall7( void);
unsigned char rd_usb_data( unsigned char *buf );
void wr_usb_data( unsigned char len, unsigned char *buf );
unsigned char issue_token( unsigned char endp_and_pid );
void host_send( unsigned char len, unsigned char *buf );
unsigned char host_recv( unsigned char *buf );
unsigned char get_descr( unsigned char type );
unsigned char set_addr( unsigned char addr );
unsigned char set_config( unsigned char cfg );
void CH375_Init( void );
unsigned char init_USB_device(void);
void ComInit(void);
void SendChar(unsigned char buff);
//void SendChars( unsigned char *buff );
void delay2us(void)
{
unsigned char i;
for ( i=DELAY_START_value*2+1; i!=0; i-- );
}
void delay50ms(void)
{
unsigned char i, j;
for( i=100; i!=0; i-- )
for( j=250; j!=0; j-- );
}
void delay1s(void)
{
unsigned char i,j,k;
for( i=10; i!=0; i-- )
for( j=200; j!=0; j-- )
for( k=250; k!=0; k-- );
}
void flash_led(void)
{
unsigned char i;
for( i=10;i>0;i-- )
{
led=!led;
delay1s();
}
}
/* 與CH372/CH375有關(guān)的基本I/O操作 */
/* 向CH375的命令端口寫入命令,周期不小于4uS,如果單片機(jī)較快則延時(shí) */
void CH375_WR_CMD_PORT( unsigned char cmd )
{
_nop_();
_nop_();
CH375_CMD_DAT = 1; /* 命令 */
CH375_DATA_PORT = cmd;
CH375_RD = 1;
CH375_WR = 0;
_nop_();
_nop_();
CH375_WR = 1;
CH375_CMD_DAT = 0;
CH375_DATA_PORT = 0xFF;
}
/* 向CH375的數(shù)據(jù)端口寫入數(shù)據(jù),周期不小于1.5uS,如果單片機(jī)較快則延時(shí) */
void CH375_WR_DAT_PORT( unsigned char dat )
{
_nop_();
CH375_CMD_DAT = 0; /* 數(shù)據(jù) */
CH375_DATA_PORT = dat;
CH375_RD = 1;
CH375_WR = 0;
_nop_();
CH375_WR = 1;
CH375_DATA_PORT = 0xFF;
}
/* 從CH375的數(shù)據(jù)端口讀出數(shù)據(jù),周期不小于1.5uS,如果單片機(jī)較快則延時(shí) */
unsigned char CH375_RD_DAT_PORT(void)
{
unsigned char rev_data;
CH375_DATA_PORT = 0xFF;
CH375_CMD_DAT = 0; /* 數(shù)據(jù) */
CH375_WR = 1;
CH375_RD = 0;
_nop_();
rev_data = CH375_DATA_PORT;
CH375_RD = 1;
return( rev_data );
}
/* 主機(jī)端等待操作完成, 返回操作狀態(tài) */
unsigned char wait_interrupt(void)
{
CH375_INT_WIRE = 1;
while( CH375_INT_WIRE ) /* 查詢等待CH375操作完成中斷(INT#低電平) */
{
if( RI==1 ) /* 串口接收到數(shù)據(jù) */
{
CH375_WR_CMD_PORT( CMD_ABORT_NAK ); /* 放棄當(dāng)前操作 */
return( 0xEF );
}
}
CH375_WR_CMD_PORT( CMD_GET_STATUS ); /* 產(chǎn)生操作完成中斷, 獲取中斷狀態(tài) */
return( CH375_RD_DAT_PORT() );
}
/* 設(shè)置CH37X的工作模式 */
void set_usb_mode( unsigned char mode )
{
unsigned char i;
CH375_WR_CMD_PORT( CMD_SET_USB_MODE );
CH375_WR_DAT_PORT( mode );
endp6_mode=endp7_mode=0x80; /* 主機(jī)端復(fù)位USB數(shù)據(jù)同步標(biāo)志 */
for( i=100; i!=0; i-- ) /* 等待設(shè)置模式操作完成,不超過30uS */
{
if( CH375_RD_DAT_PORT() == CMD_RET_SUCCESS )
return; /* 成功 */
}
while(1)
{
flash_led(); /* CH375出錯(cuò) */
}
}
/************************************************************************************
數(shù)據(jù)同步
USB的數(shù)據(jù)同步通過切換DATA0和DATA1實(shí)現(xiàn): 在設(shè)備端, USB設(shè)備可以自動(dòng)切換;
在主機(jī)端, 必須由SET_ENDP6和SET_ENDP7命令控制CH375切換DATA0與DATA1.
主機(jī)端的程序處理方法是為設(shè)備端的各個(gè)端點(diǎn)分別提供一個(gè)全局變量,
初始值均為DATA0, 每執(zhí)行一次成功事務(wù)后取反, 每執(zhí)行一次失敗事務(wù)后將其復(fù)位為DATA1
*************************************************************************************/
void toggle_recv(void) /* 主機(jī)接收成功后,切換DATA0和DATA1實(shí)現(xiàn)數(shù)據(jù)同步 */
{
CH375_WR_CMD_PORT( CMD_SET_ENDP6 );
CH375_WR_DAT_PORT( endp6_mode );
endp6_mode^=0x40;
delay2us();
}
void toggle_send(void) /* 主機(jī)發(fā)送成功后,切換DATA0和DATA1實(shí)現(xiàn)數(shù)據(jù)同步 */
{
CH375_WR_CMD_PORT( CMD_SET_ENDP7 );
CH375_WR_DAT_PORT( endp7_mode );
endp7_mode^=0x40;
delay2us();
}
unsigned char clr_stall6(void) /* 主機(jī)接收失敗后,復(fù)位設(shè)備端的數(shù)據(jù)同步到DATA0 */
{
CH375_WR_CMD_PORT( CMD_CLR_STALL );
CH375_WR_DAT_PORT( 2 0x80 ); /* 如果設(shè)備端不是CH37X芯片,那么需要修改端點(diǎn)號(hào) */
// CH375_WR_DAT_PORT( endp_out_addr 0x80 ); /* 如果設(shè)備端不是CH37X芯片,那么需要修改端點(diǎn)號(hào) */
endp6_mode=0x80;
return( wait_interrupt() );
}
unsigned char clr_stall7(void) /* 主機(jī)發(fā)送失敗后,復(fù)位設(shè)備端的數(shù)據(jù)同步到DATA0 */
{
CH375_WR_CMD_PORT( CMD_CLR_STALL );
// CH375_WR_DAT_PORT( 2 ); /* 如果設(shè)備端不是CH37X芯片,那么需要修改端點(diǎn)號(hào) */
CH375_WR_DAT_PORT( endp_out_addr ); /* 如果設(shè)備端不是CH37X芯片,那么需要修改端點(diǎn)號(hào) */
endp7_mode=0x80;
return( wait_interrupt() );
}
/* 數(shù)據(jù)讀寫, 單片機(jī)讀寫CH372或者CH375芯片中的數(shù)據(jù)緩沖區(qū) */
unsigned char rd_usb_data( unsigned char *buf ) /* 從CH37X讀出數(shù)據(jù)塊 */
{
unsigned char len, length;
CH375_WR_CMD_PORT( CMD_RD_USB_DATA ); /* 從CH375的端點(diǎn)緩沖區(qū)讀取接收到的數(shù)據(jù) */
len=CH375_RD_DAT_PORT(); /* 后續(xù)數(shù)據(jù)長度 */
length=len;
while( len-- )
{
*buf = CH375_RD_DAT_PORT();
buf++;
}
return( length );
}
/* 向CH37X寫入數(shù)據(jù)塊 */
void wr_usb_data( unsigned char len, unsigned char *buf )
{
CH375_WR_CMD_PORT( CMD_WR_USB_DATA7 ); /* 向CH375的端點(diǎn)緩沖區(qū)寫入準(zhǔn)備發(fā)送的數(shù)據(jù) */
CH375_WR_DAT_PORT( len ); /* 后續(xù)數(shù)據(jù)長度, len不能大于64 */
while( len-- )
{
CH375_WR_DAT_PORT( *buf );
buf++;
}
}
/* 主機(jī)操作 */
unsigned char issue_token( unsigned char endp_and_pid ) /* 執(zhí)行USB事務(wù) */
{
unsigned char status;
/* 執(zhí)行完成后, 將產(chǎn)生中斷通知單片機(jī), 如果是USB_INT_SUCCESS就說明操作成功 */
CH375_WR_CMD_PORT( CMD_ISSUE_TOKEN );
CH375_WR_DAT_PORT( endp_and_pid ); /* 高4位目的端點(diǎn)號(hào), 低4位令牌PID */
status = wait_interrupt(); /* 等待CH375操作完成 */
return( status );
}
void host_send( unsigned char len, unsigned char *buf ) /* 主機(jī)發(fā)送 */
{
unsigned char status;
unsigned char length;
led=1;
while( len ) /* 連續(xù)輸出數(shù)據(jù)塊給USB設(shè)備 */
{
// length = len>endp_out_size?endp_out_size:len; /* 單次發(fā)送不能超過端點(diǎn)尺寸 */
if( len>endp_out_size )
length=endp_out_size;
else
length=len;
wr_usb_data( length, buf ); /* 將數(shù)據(jù)先復(fù)制到CH375芯片中 */
toggle_send(); /* 數(shù)據(jù)同步 */
status = issue_token( ( endp_out_addr << 4 ) DEF_USB_PID_OUT ); /* 請(qǐng)求CH375輸出數(shù)據(jù) */
// status = issue_token( ( 2 << 4 ) DEF_USB_PID_OUT ); /* 請(qǐng)求CH375輸出數(shù)據(jù) */
if( status==USB_INT_SUCCESS ) /* CH375成功發(fā)出數(shù)據(jù) */
{
len -= length; /* 計(jì)數(shù) */
buf += length; /* 操作成功 */
}
else
if( status==0xEF )
{
led=0;
return;
}
else /* 操作失敗,正常情況下不會(huì)失敗 */
if( status != 0xEF )
{
clr_stall7(); /* 清除設(shè)備的數(shù)據(jù)接收端點(diǎn) */
}
}
led=0;
}
unsigned char host_recv( unsigned char *buf ) /* 主機(jī)接收, 返回長度 */
{
unsigned char status;
if( endp_in_addr ) /* 支持雙向接口 */
{
toggle_recv(); /* 設(shè)置主機(jī)接收的同步標(biāo)志 */
status = issue_token( ( endp_in_addr << 4 ) DEF_USB_PID_IN );
// status = issue_token( ( 2 << 4 ) DEF_USB_PID_IN );
if( status==USB_INT_SUCCESS ) /* 接收成功 */
{
status = rd_usb_data( buf );
return( status ); /* 讀取接收到的數(shù)據(jù) */
}
else
if( status==USB_INT_DISCONNECT )
{
return( 0xFE ); /* USB設(shè)備斷開事件 */
}
else
if( status==0xEF ) /* 串口接收到數(shù)據(jù) */
{
return( status );
}
else /* 接收失敗 */
{
clr_stall6(); /* 接收設(shè)備端的端點(diǎn)錯(cuò)誤 */
return( 0xFF ); /* 返回操作失敗 */
}
}
return( 0xFF ); /* 返回操作失敗 */
}
unsigned char get_descr( unsigned char type ) /* 從設(shè)備端獲取描述符 */
{
CH375_WR_CMD_PORT( CMD_GET_DESCR );
CH375_WR_DAT_PORT( type ); /* 描述符類型, 只支持1(設(shè)備)或者2(配置) */
return( wait_interrupt() ); /* 等待CH375操作完成 */
}
unsigned char set_addr( unsigned char addr ) /* 設(shè)置設(shè)備端的USB地址 */
{
unsigned char status;
CH375_WR_CMD_PORT( CMD_SET_ADDRESS ); /* 設(shè)置USB設(shè)備端的USB地址 */
CH375_WR_DAT_PORT( addr ); /* 地址, 從1到127之間的任意值, 常用2到20 */
status=wait_interrupt(); /* 等待CH375操作完成 */
if( status==USB_INT_SUCCESS ) /* 操作成功 */
{
CH375_WR_CMD_PORT( CMD_SET_USB_ADDR ); /* 設(shè)置USB主機(jī)端的USB地址 */
CH375_WR_DAT_PORT( addr ); /* 當(dāng)目標(biāo)USB設(shè)備的地址成功修改后,應(yīng)該同步修改主機(jī)端的USB地址 */
}
return( status );
}
unsigned char set_config( unsigned char cfg ) /* 設(shè)置設(shè)備端的USB配置 */
{
endp6_mode=endp7_mode=0x80; /* 復(fù)位USB數(shù)據(jù)同步標(biāo)志 */
CH375_WR_CMD_PORT( CMD_SET_CONFIG ); /* 設(shè)置USB設(shè)備端的配置值 */
CH375_WR_DAT_PORT( cfg ); /* 此值取自USB設(shè)備的配置描述符中 */
return( wait_interrupt() ); /* 等待CH375操作完成 */
}
/* CH375初始化子程序 */
void CH375_Init( void )
{
unsigned char i, k;
unsigned char RD_Data;
CH375_DATA_PORT = 0xFF;
CH375_INT_WIRE = 1;
CH375_WR = 1;
CH375_RD = 1;
CH375_CMD_DAT = 0;
/* 測(cè)試CH375是否正常工作 */
for( k=100; k!=0; k-- )
{
CH375_WR_CMD_PORT( CMD_CHECK_EXIST ); /* 測(cè)試CH375是否正常工作 */
i = 0x5A;
CH375_WR_DAT_PORT( i ); /* 寫入測(cè)試數(shù)據(jù) */
i = ~i; /* 返回?cái)?shù)據(jù)應(yīng)該是測(cè)試數(shù)據(jù)取反 */
RD_Data = CH375_RD_DAT_PORT();
if ( RD_Data != i ) /* CH375不正常 */
{
for ( i=5; i!=0; i-- )
{
CH375_WR_CMD_PORT( CMD_RESET_ALL ); /* 多次重復(fù)發(fā)命令,執(zhí)行硬件復(fù)位 */
}
delay50ms(); /* 延時(shí)50ms */
}
else
break;
}
if( k==0 )
{
while(1)
{
flash_led(); /* CH375出錯(cuò) */
}
}
/* 設(shè)置USB主機(jī)模式, 如果設(shè)備端是CH37X, 那么5和6均可 */
set_usb_mode( 6 );
}
/* 初始化USB設(shè)備,完成設(shè)備枚舉 */
unsigned char init_USB_device(void)
{
unsigned char address;
unsigned char status;
unsigned char length;
status = get_descr(1); /* 獲取設(shè)備描述符 */
if( status == USB_INT_SUCCESS )
{
length = rd_usb_data( RECV_BUFFER ); /* 將獲取的描述符數(shù)據(jù)從CH375中讀出到單片機(jī)的RAM緩沖區(qū)中,返回描述符長度 */
if( length<18 p_dev_descr->bDescriptorType!=1 )
return( UNKNOWN_USB_DEVICE ); /* 意外錯(cuò)誤:描述符長度錯(cuò)誤或者類型錯(cuò)誤 */
// if( p_dev_descr->bDeviceClass!=0 )
// return( UNKNOWN_USB_DEVICE ); /* 連接的USB設(shè)備不符合USB規(guī)范 */
status = set_addr(2); /* 設(shè)置USB設(shè)備的USB地址 */
if( status == USB_INT_SUCCESS )
{
status = get_descr(2); /* 獲取配置描述符 */
if( status == USB_INT_SUCCESS ) /* 操作成功則讀出描述符并分析 */
{
length = rd_usb_data( RECV_BUFFER ); /* 將獲取的描述符數(shù)據(jù)從CH375中讀出到單片機(jī)的RAM緩沖區(qū)中,返回描述符長度 */
// if( p_cfg_descr->itf_descr.bInterfaceClass!=7 p_cfg_descr->itf_descr.bInterfaceSubClass!=1 )
// return( UNKNOWN_USB_DEVICE ); /* 不符合USB規(guī)范 */
endp_out_addr=endp_in_addr=0;
address = p_cfg_descr->endp_descr[0].bEndpointAddress; /* 第一個(gè)端點(diǎn)的地址 */
if( address&0x80 )
endp_in_addr = address&0x0f; /* IN端點(diǎn)的地址 */
else
{ /* OUT端點(diǎn) */
endp_out_addr = address&0x0f;
endp_out_size = p_cfg_descr->endp_descr[0].wMaxPacketSize; /* 數(shù)據(jù)接收端點(diǎn)的最大包長度 */
if( endp_out_size == 0 endp_out_size > 64 )
endp_out_size = 64;
}
if( p_cfg_descr->itf_descr.bNumEndpoints>=2 ) /* 接口有兩個(gè)以上的端點(diǎn) */
{
if( p_cfg_descr->endp_descr[1].bDescriptorType==5 ) /* 端點(diǎn)描述符 */
{
address = p_cfg_descr->endp_descr[1].bEndpointAddress; /* 第二個(gè)端點(diǎn)的地址 */
if( address&0x80 )
endp_in_addr = address&0x0f; /* IN端點(diǎn) */
else
{ /* OUT端點(diǎn) */
endp_out_addr = address&0x0f;
endp_out_size = p_cfg_descr->endp_descr[1].wMaxPacketSize;
if( endp_out_size == 0 endp_out_size > 64 )
endp_out_size = 64;
}
}
}
if( p_cfg_descr->itf_descr.bInterfaceProtocol==1 )
endp_in_addr=0; /* 單向接口不需要IN端點(diǎn) */
if( endp_out_addr==0 )
return( UNKNOWN_USB_DEVICE ); /* 不符合USB規(guī)范 */
status = set_config( p_cfg_descr->cfg_descr.bConfigurationvalue ); /* 加載USB配置值 */
if( status == USB_INT_SUCCESS )
{
/* 如果單片機(jī)在USB設(shè)備忙時(shí)并無事可做,建議設(shè)置位7為1,使CH375在收到NAK時(shí)自動(dòng)重試直到操作成功或者失敗 */
/* 如果希望單片機(jī)在USB設(shè)備忙時(shí)能夠做其它事,那么應(yīng)該設(shè)置位7為0,使CH375在收到NAK時(shí)不重試,
所以在下面的USB通訊過程中,如果USB設(shè)備正忙,issue_token等子程序?qū)⒌玫綘顟B(tài)碼USB_INT_RET_NAK */
CH375_WR_CMD_PORT( CMD_SET_RETRY ); // 設(shè)置USB事務(wù)操作的重試次數(shù)
CH375_WR_DAT_PORT( 0x25 );
CH375_WR_DAT_PORT( 0x85 ); // 位7為1則收到NAK時(shí)無限重試, 位3~位0為超時(shí)后的重試次數(shù)
}
}
}
}
return(status);
}
/* 串行口通訊子程序 */
/* 串行口初始化 */
void ComInit(void)
{
TMOD = 0x20; /*T1為方式2 */
TH1 = 0xFE; /*計(jì)數(shù)常數(shù)0xFE,波特率：14400 晶振:11.0592MHz */
TL1 = 0xFE;
PCON = PCON & 0x7f; /* SMOD=0 */
SCON = 0x50; /* 串行口工作在方式3 */
TR1 = 1;
}
/* 發(fā)送數(shù)據(jù) */
void SendChar(unsigned char buff)
{
SBUF = buff;
while( !TI );
TI=0;
}
/* 發(fā)送數(shù)據(jù)串
void SendChars( unsigned char *buff )
{
unsigned char buf;
while(1)
{
buf = *buff;
if( buf == 0x00 )
break;
SBUF = buf;
buff++;
while( !TI );
TI=0;
}
}
*/
/*串行數(shù)據(jù)接收程序*/
void receive(void)
{
unsigned int count;
unsigned char buf;
RECV_LEN=0;
cmd_buf = RECV_BUFFER; /* 接收緩沖區(qū) */
while( 1 )
{
RI=0;
*cmd_buf = SBUF;
cmd_buf++;
RECV_LEN++;
if( RECV_LEN == 64 )
{
while( 1 )
{
count=10000;
while( RI==0 )
{
count--;
if( count==0 )
return;
}
RI=0;
buf=SBUF;
}
}
count=10000;
while( RI==0 )
{
count--;
if( count==0 )
return;
}
}
}
/* 主機(jī)端的主程序 */
void main(void)
{
unsigned char i;
unsigned char length;
delay1s();
CH375_Init();
ComInit();
led=0;
while(1)
{
led=0;
while (1)
{
if( wait_interrupt() == USB_INT_CONNECT ) /* 等待設(shè)備端連接上來 */
{
// SendChars( "USB設(shè)備連接\n" );
break;
}
}
/* 如果設(shè)備端是CH37X,那么以下步驟是可選的,
如果是其它USB芯片,那么需要執(zhí)行以下步驟,并且要分析配置描述符的數(shù)據(jù)獲得配置值以及端點(diǎn)號(hào),并修改本程序中的端點(diǎn)號(hào),USB規(guī)范中未要求在USB設(shè)備插入后必須復(fù)位該設(shè)備,但是計(jì)算機(jī)的WINDOWS總是這樣做,所以有些USB設(shè)備也要求在插入后必須先復(fù)位才能工作 */
set_usb_mode( 7 ); /* 復(fù)位USB設(shè)備,CH375向USB信號(hào)線的D+和D-輸出低電平 */
/* 如果單片機(jī)對(duì)CH375的INT#引腳采用中斷方式而不是查詢方式,那么應(yīng)該在復(fù)制USB設(shè)備期間禁止CH375中斷,在USB設(shè)備復(fù)位完成后清除CH375中斷標(biāo)志再允許中斷 */
delay50ms();
set_usb_mode( 6 ); /* 結(jié)束復(fù)位 */
while (1)
{
if( wait_interrupt() == USB_INT_CONNECT ) /* 等待復(fù)位之后的設(shè)備端再次連接上來 */
break;
}
delay1s(); /* 有些USB設(shè)備要求延時(shí)數(shù)百毫秒后才能工作 */
for( i=5;i!=0;i-- )
{
if( init_USB_device() != USB_INT_SUCCESS ) /* 初始化USB設(shè)備 */
flash_led(); //錯(cuò)誤
else
break;
}
if( i==0 )
{
flash_led(); //錯(cuò)誤
flash_led(); //錯(cuò)誤
flash_led(); //錯(cuò)誤
continue;
}
while(1)
{
ret_buf = RECV_BUFFER; /* 接收緩沖區(qū) */
length = host_recv( ret_buf ); /* 從設(shè)備端接收數(shù)據(jù) */
if( length == 0xEF ) /* 串口接收到數(shù)據(jù) */
{
led=1;
receive();
led=0;
ret_buf = RECV_BUFFER; /* 接收緩沖區(qū) */
length = RECV_LEN; /* 剛接收到的數(shù)據(jù)長度 */
if( length!=0 )
host_send( length, ret_buf ); /* 將從串口接收到的數(shù)據(jù)發(fā)送到USB設(shè)備 */
}
else
if( length == 0xFE ) /* USB設(shè)備斷開事件 */
{
// SendChars( "USB設(shè)備斷開\n" );
break;
}
else
if( length != 0xFF )
{
ret_buf = RECV_BUFFER; /* 接收緩沖區(qū) */
while( length-- )
{
SendChar( *ret_buf ); /* 將從USB設(shè)備接收到的數(shù)據(jù)發(fā)送到串口 */
ret_buf++;
}
}
}
}
}
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66821730(技術(shù)支持)
