main.c

基于AT91SAM7SE512cpu使用SDRAM的例子

//*----------------------------------------------------------------------------
//*         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.c
//* Object              : main application written in C to SDRAM
//* 1.0 18/May/06 JPP	: Creation
//*----------------------------------------------------------------------------

// Include Standard files
#include "project.h"
#include "AT91SAM7SE-EK.h"
#include "SDRAM.h"
//*----------------------------------------------------------------------------
//* \fn    AT91F_TestSdram
//* \brief SDRAM test
//*----------------------------------------------------------------------------

int AT91F_TestSdram(void)
{
	unsigned int i;
    // Write
	for(i = 0; i < AT91C_SDRAM_SIZE; i++)
	{
		*(AT91C_SDRAM_BASE + i) = i;
	}
	// Read and check
	for(i = 0; i < AT91C_SDRAM_SIZE; i++)
	{
		if (*(AT91C_SDRAM_BASE + i) != i)
		return -1;
	}
	return 0;
}

//*--------------------------------------------------------------------------------------
//* Function Name       	: Main
//* Object              	: Software entry point
//* Input Parameters    : none.
//* Output Parameters  : none.
//*--------------------------------------------------------------------------------------
int main()
{
   int Test;

    // First, enable the clock of the PIO LEDs
       AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1 << AT91C_ID_PIOA ) ;

    // then, we configure the PIO Lines corresponding to LED1 to LED2 to be
    // outputs. No need to set these pins to be driven by the PIO because it is
    // GPIO pins only.
       AT91F_PIO_CfgOutput( AT91D_BASE_PIO_LED, AT91B_LED_MASK );

    // Clear the LED's. On the board we must apply a "1" to turn off LEDs
       AT91F_PIO_SetOutput( AT91D_BASE_PIO_LED, AT91B_LED_MASK );

    //* Initi SDRAM access
	   AT91F_InitSdram ();
    //* Test SDRAM
       Test = AT91F_TestSdram();
       if ( Test != -1) { //* SDRAM OK
              AT91F_PIO_ClearOutput( AT91D_BASE_PIO_LED, AT91B_LED2) ;
       } else {  //* SDRAM FAIL !!
              AT91F_PIO_ClearOutput( AT91D_BASE_PIO_LED, AT91B_POWERLED|AT91B_LED1) ;
       }
     //* while (1);
        for(;;){};
}