sram_test.c

SEED-DaVinci_EVM sram 开发源代码

#include "davincievm_emif.h"

/* ------------------------------------------------------------------------ *
 *                                                                          *
 *  sram_init( )                                                            *
 *      Configure pinmux and wait states                                    *
 *                                                                          *
 * ------------------------------------------------------------------------ */
Int16 sram_init( )
{
    /*------------------------------------------------------------------*
     *  SRAM CHIP TIMEOUT @ 594 MHz                                     *
     *                                                                  *
     *  AEMIF.CLK freq   = PLL1/6 = 594/6 = 99 MHz                      *
     *  AEMIF.CLK period = 1/99 MHz = 10.1 ns                           *
     *                                                                  *
     *------------------------------------------------------------------*/
    Uint32 acfg2 = 0
        | ( 0 << 31 )           // selectStrobe
        | ( 0 << 30 )           // extWait
        | ( 0 << 26 )           // writeSetup      //   0 ns
        | ( 9 << 20 )           // writeStrobe     //  85 ns
        | ( 0 << 17 )           // writeHold       //   0 ns
        | ( 0 << 13 )           // readSetup       //   0 ns
        | ( 6 << 7 )            // readStrobe      //  60 ns
        | ( 0 << 4 )            // readHold        //   0 ns
        | ( 1 << 2 )            // turnAround      //  10 ns
        | ( 1 << 0 )            // asyncSize       // 16-bit bus
        ;

    DAVINCIEVM_EMIF_config( acfg2, 
                            AEMIF_MAX_TIMEOUT_16BIT, 
                            AEMIF_MAX_TIMEOUT_16BIT, 
                            AEMIF_MAX_TIMEOUT_16BIT );

    AEMIF_NANDFCR = 0x00000000;
	DAVINCIEVM_PMX_clear( 0x00030000, 0);
    return 0;
}

extern memfill32( Uint32 start, Uint32 len, Uint32 val );
extern memaddr32( Uint32 start, Uint32 len );
extern meminvaddr32( Uint32 start, Uint32 len );

/* ------------------------------------------------------------------------ *
 *                                                                          *
 *  sram_test( )                                                            *
 *                                                                          *
 * ------------------------------------------------------------------------ */
Uint32 sram_test( void )
{
    Uint32 retcode = 0;
    Uint32 SRAM_BASE = 0x02000000;
    Uint32 SRAM_SIZE = 0x00200000;

    /* Initialize SRAM */
    sram_init( );

    retcode |= memfill32( SRAM_BASE, SRAM_SIZE, 0xFFFFFFFF );
    retcode |= memfill32( SRAM_BASE, SRAM_SIZE, 0xAAAAAAAA );
    retcode |= memfill32( SRAM_BASE, SRAM_SIZE, 0x55555555 );
    retcode |= memfill32( SRAM_BASE, SRAM_SIZE, 0x00000000 );

    retcode |= memaddr32( SRAM_BASE, SRAM_SIZE );
    retcode |= meminvaddr32( SRAM_BASE, SRAM_SIZE );
    return retcode;
}