Question

我正在尝试为C8051F340编写设备代码，以便通过USB从主机（PC）获取数据。我有一些来自硅实验室的例子，代码如下所示：

void  Receive_File(void)
{
   ReadStageLength = ((BytesToRead - BytesRead) > MAX_BLOCK_SIZE_READ)? MAX_BLOCK_SIZE_READ:(BytesToRead - BytesRead);

   BytesRead   += Block_Read((U8*)(&TempStorage[BlockIndex]), ReadStageLength);   // Read Block

   BlockIndex++;
  // If device has received as many bytes as fit on one FLASH page, disable interrupts,
  // write page to flash, reset packet index, enable interrupts
  // Send handshake packet 0xFF to host after FLASH write
   if ((BlockIndex   == (BLOCKS_PR_PAGE)) || (BytesRead  == BytesToRead))
 {
  Page_Erase((U8*)(PageIndices[PageIndex]));
  Page_Write((U8*)(PageIndices[PageIndex]));
  PageIndex++;
  Led1 = !Led1;
  BlockIndex  =  0;
  Buffer[0]   =  0xFF;
  Block_Write(Buffer,  1);         // Send handshake Acknowledge to host
 }

// Go to Idle state if last packet has been received
if (BytesRead  == BytesToRead)   {M_State =  ST_IDLE_DEV;   Led1  =  0;}
}

// Startup code for SDCC to disablt WDT before initializing variables so  that
// a reset does not occur
 #if defined SDCC
void _sdcc_external_startup (void)
{
 PCA0MD &= ~0x40;                    // Disable Watchdog timer
}
#endif

我有一些问题想问： 1.数据在哪里？缓冲区[0]？ 2.如果我从主机获得Hex值传输，我可以只读取Buffer [0]来获取它吗？对不起，我是新手。谢谢。

Answer 1

您收到的数据存储在数组TempStorage中您使用Buufer [0]（值0xFF）将数据发送到主机

C8051F340 USB器件数据传输硅实验室IDE

1 个答案: