init.c

AT91SAM7S_usart底层控制程序

/******************************************************************************
 *         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           : init.c
 * Object              : DBUG utility
 * Creation            : JPP 03/Jun/03
******************************************************************************/
// Include Standard LIB  files
#include "Board.h"
#include "main.h"
#include "AT91SAM7S64a.H"                       /* AT91SAMT7S64 definitions  */
#include "lib_AT91SAM7S64a.h"

/******************************************************************************
 * \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
		MCK,
		AT91C_US_ASYNC_MODE ,                 // Mode Register to be programmed
		AT91C_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