原创 CY7C68013A开发板编程之七（Bulkext）

 2010-12-26 14:11  1212 7 7 分类: 通信

这是用CYPRESS提供的框架程序实现的一个例子，功能是实现块传输（Bulk），上位机程序用的是Cybulk.exe，运行后如下所示，

　　第一，先看一下固件程序。函数TD_Init()先是对端点进行初始化，4个大端点，2和4为OUT端点，6和8为IN端点，具体配置如下，

EP2CFG = 0xA2;
SYNCDELAY;
EP4CFG = 0xA0;
SYNCDELAY;
EP6CFG = 0xE2;
SYNCDELAY;
EP8CFG = 0xE0;

　　接下来对两个OUT端点进行Arm，随时可以接受上位机发过来的数据，程序如下，

EP2BCL = 0x80;                // arm EP2OUT by writing byte count w/skip.
SYNCDELAY;
EP2BCL = 0x80;
SYNCDELAY;
EP4BCL = 0x80;                // arm EP4OUT by writing byte count w/skip.
SYNCDELAY;
EP4BCL = 0x80;

　　第二，函数TD_Poll()实现块传输。具体实现可以看程序，注释很详细，

void TD_Poll(void) // Called repeatedly while the device is idle
{
WORD i;
WORD count;

if(!(EP2468STAT & bmEP2EMPTY))
{ // check EP2 EMPTY(busy) bit in EP2468STAT (SFR), core set's this bit when FIFO is empty
     if(!(EP2468STAT & bmEP6FULL))
     { // check EP6 FULL(busy) bit in EP2468STAT (SFR), core set's this bit when FIFO is full
        // Source is EP2OUT
        APTR1H = MSB( &EP2FIFOBUF );
        APTR1L = LSB( &EP2FIFOBUF );

        // Destination is external RAM (at 0x2800)
        AUTOPTRH2 = 0x28;
        AUTOPTRL2 = 0x00;

count = (EP2BCH << 8) + EP2BCL;

        for( i = 0x0000; i < count; i++ )
        {
           EXTAUTODAT2 = EXTAUTODAT1;
        }

        // Source is external RAM
        APTR1H = 0x28;
        APTR1L = 0x00;

        // Destination is EP6IN
        AUTOPTRH2 = MSB( &EP6FIFOBUF );
        AUTOPTRL2 = LSB( &EP6FIFOBUF );

count = (EP2BCH << 8) + EP2BCL;

        for( i = 0x0000; i < count; i++ )
        {
           EXTAUTODAT2 = EXTAUTODAT1;
        }

        EP6BCH = EP2BCH;
        SYNCDELAY;
        EP6BCL = EP2BCL;        // arm EP6IN
        SYNCDELAY;
        EP2BCL = 0x80;          // re(arm) EP2OUT
     }
}

if(!(EP2468STAT & bmEP4EMPTY))
{ // check EP4 EMPTY(busy) bit in EP2468STAT (SFR), core set's this bit when FIFO is empty
     if(!(EP2468STAT & bmEP8FULL))
     { // check EP8 FULL(busy) bit in EP2468STAT (SFR), core set's this bit when FIFO is full
        // setup AUTOPOINTER(s) in SFR space
        // source is EP4OUT
        APTR1H = MSB( &EP4FIFOBUF );
        APTR1L = LSB( &EP4FIFOBUF );

        // Destination is external RAM (at 0x2A00)
        AUTOPTRH2 = 0x2A;
        AUTOPTRL2 = 0x00;

count = (EP4BCH << 8) + EP4BCL;

        for( i = 0x0000; i < count; i++ )
        {
           EXTAUTODAT2 = EXTAUTODAT1;
        }

        // Source is external RAM
        APTR1H = 0x2A;
        APTR1L = 0x00;

        // Destination is EP8IN
        AUTOPTRH2 = MSB( &EP8FIFOBUF );;
        AUTOPTRL2 = LSB( &EP8FIFOBUF );;

count = (EP4BCH << 8) + EP4BCL;

        // loop EP2OUT buffer data to EP6IN
        for( i = 0x0000; i < count; i++ )
        {
           // setup to transfer EP2OUT buffer to EP6IN buffer using AUTOPOINTER(s)
           EXTAUTODAT2 = EXTAUTODAT1;
        }

        EP8BCH = EP4BCH;
        SYNCDELAY;
        EP8BCL = EP4BCL;        // arm EP8IN
        SYNCDELAY;
        EP4BCL = 0x80;          // re(arm) EP4OUT
     }
}
}

　　第三，装载固件程序，打开上位机软件，启动块传输，如下，