polling.c

ATEML公司EB40/40a/42/63/55开发板部分测试程序。

//*-----------------------------------------------------------------------------
//*      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           : polling.c
//* Object              : AT91 - USART Controller - Transfert by Polling
//*
//* Imported resources  : None
//* Exported resources  : MainApplication
//*
//* 1.0 01/10/98 JLV    : Creation
//* 2.0 21/10/98 JCZ    : Clean up
//* 2.1 10/04/00 JPP    : Channel on PIOTXD0
//* 2.2 14/01/02 PFi	: Port to EB40
//*----------------------------------------------------------------------------
#ifndef AT91_DEBUG_NONE
#include <stdio.h>
#endif

#include    "periph/stdc/std_c.h"
#include    "eb40.h"
#include    "parts/r40807/reg_r40807.h"


//*----------------------------------------------------------------------------
//* Function Name       : main
//* Object              : AT91 - USART Controller - transfert by polling
//* Input Parameters    : None
//* Output Parameters   : None
//* Functions called    : None
//*----------------------------------------------------------------------------
int main ( void )
//* Begin
{
    unsigned int    loop_count;
    unsigned int    value;

//* Stop channel
    US0_CR = ( US_TXDIS | US_RXDIS | US_RSTTX | US_RSTRX ) ;
    for (loop_count = 1000 ; loop_count > 0 ; loop_count--) ;

//* Clear PDC counts (Rx and Tx)
    US0_RCR  = 0x00000000 ;
    US0_TCR  = 0x00000000 ;

//*Disable ITs
    US0_IDR = 0xFFFFFFFF ;

//* Initialize the channel
    PIO_PDR = ( PIOTXD0 | PIORXD0 ) ;
    US0_MR = ( US_ASYNC_MODE | US_CHMODE_LOCAL_LOOPBACK ) ;
    US0_BRGR = 53 ;

//* Start channel
    US0_CR = ( US_RXEN | US_TXEN ) ;
    for (loop_count = 1000 ; loop_count > 0 ; loop_count--);

    for (value = 0 ; ; value++)
    {
        value &= 0x00FF;
#ifndef AT91_DEBUG_NONE
        if (value == 0)
        {
            loop_count ++ ;
            printf ( "Loop %d\n", loop_count ) ;
        }
#endif
        //* Wait Tx ready
            for ( ; (US0_CSR & (1 << 1)) == 0 ; );

        //* Send byte
            US0_THR = value;

        //* Wait Rx ready
            for ( ; (US0_CSR & (1 << 0)) == 0 ; );

        //* Receive and check byte
            if (US0_RHR != value)
	
	{
#ifndef AT91_DEBUG_NONE
            printf ( "**** 0x'%x' / 0x'%x'\n", US0_RHR, value);
#endif
        }
     }

//* End
    return(0);
}