init.c

基于 at91sam7s256 的i2c驱动源码

// ----------------------------------------------------------------------------
//         ATMEL Microcontroller Software Support  -  ROUSSET  -
// ----------------------------------------------------------------------------
// DISCLAIMER:  THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
// DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//*----------------------------------------------------------------------------
//* File Name           : init.c
//* Object              : DBUG utility
//* Creation            : JPP   02/Jul/2004
//* V 1.00  28-Jun-2006 JPP change for EK
//*----------------------------------------------------------------------------

// Include Standard LIB  files
#include "project.h"
#include "main.h"
//*----------------------------------------------------------------------------
//* Function Name       : Trace_Toggel_LED
//* Object              : Toggel a PIO
//*----------------------------------------------------------------------------
void Trace_Toggel_LED (unsigned int Led)
{
    if ( (AT91F_PIO_GetInput(AT91D_BASE_PIO_LED) & Led ) == Led )
    {
        AT91F_PIO_ClearOutput( AT91D_BASE_PIO_LED, Led );
    }
    else
    {
        AT91F_PIO_SetOutput( AT91D_BASE_PIO_LED, Led );
    }
}

//*--------------------------1--------------------------------------------------
//* \fn    AT91F_DBGU_Init
//* \brief This function is used to send a string through the DBGU channel (Very low level debugging)
//*----------------------------------------------------------------------------
void AT91F_DBGU_Init(void)
{
    //* Open PIO for DBGU
        AT91F_DBGU_CfgPIO();

    //* Configure DBGU
	AT91F_US_Configure (
		(AT91PS_USART) AT91C_BASE_DBGU,       // DBGU base address
		AT91B_MCK,
		AT91C_US_ASYNC_MODE ,                 // Mode Register to be programmed
		AT91B_DBGU_BAUD ,                     // Baudrate to be programmed
		0);                                   // Timeguard to be programmed

    //* Enable Transmitter & receivier
       ((AT91PS_USART)AT91C_BASE_DBGU)->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
}

//*----------------------------------------------------------------------------
//* Function Name       : AT91F_DBGU_Get
//* Object              : Get a string to USART manage Blackspace and echo
//* Input Parameters    : com descriptor, type string & val return value
//* Output Parameters   : none
//*----------------------------------------------------------------------------
unsigned int AT91F_DBGU_Get( char *val)
{//* Begin
    if ((AT91F_US_RxReady((AT91PS_USART)AT91C_BASE_DBGU)) == 0)
        return (1);
    else
    {
        *val= AT91F_US_GetChar((AT91PS_USART)AT91C_BASE_DBGU);
        return (0);
    }
}//* End

//*----------------------------------------------------------------------------
//* Function Name       : AT91F_DBGU_scanf
//* Object              : Get a string to USART manage Blackspace and echo
//* Input Parameters    : com descriptor, type string & val return value
//* Output Parameters   : none
//*----------------------------------------------------------------------------
void AT91F_DBGU_scanf(char * type,unsigned int * val)
{//* Begin
    unsigned int read = 0;
    char buff[10];
    unsigned int nb_read =0;

    while( (read != 0x0D) & (nb_read != sizeof(buff)) ) {
        //* wait the USART Ready for reception
	 while((AT91C_BASE_DBGU->DBGU_CSR  & AT91C_US_RXRDY) == 0 ) ;
        //* Get a char
	read = AT91C_BASE_DBGU->DBGU_RHR ;
        buff[nb_read]= (char)read;
        //* Manage Blackspace
        while((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXRDY) ==0)  {}
        if ((char)read == 0x08) {
            if ( nb_read != 0 ) {
              nb_read--;
              AT91C_BASE_DBGU->DBGU_THR = read;
            }
        }
        else {
          //* echo
          AT91C_BASE_DBGU->DBGU_THR = read;
          nb_read++;
        }
    }
    //* scan the value
    sscanf(buff,type,val);
}//* End

//*----------------------------------------------------------------------------
//* \fn    AT91F_DBGU_Printk
//* \brief This function is used to send a string through the DBGU channel (Very low level debugging)
//*----------------------------------------------------------------------------
void AT91F_DBGU_Printk( char *buffer) // \arg pointer to a string ending by \0
{//* Begin
	while(*buffer != '\0') {
		while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_DBGU));
		AT91F_US_PutChar((AT91PS_USART)AT91C_BASE_DBGU, *buffer++);
	}
}//* End