main.c

USB虚拟串口的实现方法,AT91SAM7S development tool kit

//*--------------------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*--------------------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*--------------------------------------------------------------------------------------
//* File Name           : main file
//* Object              :
//* Translator          :
//* 1.0 02/Mar/05 JPP	: Creation
//*--------------------------------------------------------------------------------------

#include "board.h"
#include "cdc_enumerate.h"

#define MSG_SIZE 				1000


//* external function

extern void Usart_init ( void );
extern void AT91F_US_Put( char *buffer); // \arg pointer to a string ending by \0
extern void Trace_Toggel_LED( unsigned int led) ;

struct _AT91S_CDC 	pCDC;

//*----------------------------------------------------------------------------
//* \fn    AT91F_USB_Open
//* \brief This function Open the USB device
//*----------------------------------------------------------------------------
void AT91F_USB_Open(void)
{
    // Set the PLL USB Divider
    AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;

    // Specific Chip USB Initialisation
    // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock
    AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;
    AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);
    // CDC Open by structure initialization
    AT91F_CDC_Open(&pCDC, AT91C_BASE_UDP);
}

//*--------------------------------------------------------------------------------------
//* Function Name       : main
//* Object              :
//*--------------------------------------------------------------------------------------
int main ( void )
{
	unsigned int fir =0;
	char data[MSG_SIZE];
	unsigned int length;
     // Enable User Reset and set its minimal assertion to 960 us
     AT91C_BASE_RSTC->RSTC_RMR = AT91C_RSTC_URSTEN | (0x4<<8) | (unsigned int)(0xA5<<24);

     AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1 << AT91C_ID_PIOA ) ;

   AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, 1<<23);
   AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, 1<<23);

    AT91F_USB_Open();

    while (!pCDC.IsConfigured(&pCDC));

while (1)
  {       // Loop
	  
	length = pCDC.Read(&pCDC, data, MSG_SIZE);
	data[length]=0;
	  	// 测试用的标志	
		//AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, 1);
		if (fir==0)
		{
 	    pCDC.Write(&pCDC, data,length);
 	    fir=1;
	  }
		else
		{
	    pCDC.Write(&pCDC, data,length);
 	    fir=0;
	  }
	 	//AT91F_PIO_SetOutput(AT91C_BASE_PIOA, 1);

		
	}
}