Nano 130 dataflash 遇到的问题

只看该作者 · 2013-6-1 09:23

M0的菜鸟，在研究FMC  dataflash,目的想把0x55放到0x1f000的位置，把0xaa放到0x1f100的位置。问题是执行
FMC_Write(0x1f000, 0x55);再执行FMC_Write(0x1f100, 0xAA);然后FMC_Read(0x1f000, &u32Data);此时是u32Data=0xAA.
按道理说0x55才对。不知道问题到底出现在哪里请大师指点迷冿。

到代码如下：
******************************************************************************/
#include <stdio.h>
#include "nano1xx.h"
#include "nano1xx_fmc.h"
void delay_ms(uint32_t count);
/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                       */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main (void)
{
int32_t i32Err=0;
uint32_t u32Data;
uint32_t u32Data0;
// uint32_t  apBase, apLimit;
/// uint32_t  config0Bak, config1Bak;

printf("+------------------------------------------------------+\n");
printf("|    NANO1xx FMC Driver Sample Code for LDROM    |\n");
printf("+------------------------------------------------------+\n");
UNLOCKREG();
/* Enable FMC ISP function */
FMC_Init();
/* Read BS */
printf("  Boot Mode .......................... ");
if (FMC_GetBootSelect() == E_FMC_APROM)
{
      printf("[APROM]\n");
      printf("  WARNING: This code should be in LD mode but it is in AP mode now.\n");
      while(1);
}
else
      printf("[LDROM]\n");

/* Read Data Flash base address */
u32Data = FMC_ReadDataFlashBaseAddr();
printf("  Data Flash Base Address ............ [0x%08x]\n", u32Data);

   FMC_Erase(0x1f000);
   delay_ms(10);
   FMC_Read(0x1f000, &u32Data);
      FMC_Write(0x1f000, 0x55);
   delay_ms(10);
   FMC_Read(0x1f100, &u32Data0);
   FMC_Write(0x1f100, 0xAA);
   delay_ms(10);
   FMC_Read(0x1f000, &u32Data);
if(u32Data == 0x55)
{
   printf("  Data Flash Base Address ............ [0x%08x]\n", u32Data);
   i32Err=FMC_Read(0x1f100, &u32Data0);
   if(i32Err==0)
   printf("  Data Flash Base Address ............ [0x%08x]\n", u32Data0);
   while(1);
}

}

/*************************************************************************************
** Function name:    delay_ms
** Descriptions:       1ms(晶振为12MHZ)延时子程序
** input parameters: count
** output parameters: 无
** Returned value:    无
*************************************************************************************/
void delay_ms(uint32_t count)
{
uint32_t i,j;
for(i=count;i>0;i--)
for(j=2395;j>0;j--);
}