[活动专区] 【AT-START-F407测评】3.运行SPIM示例代码

void FLASH_InitExtFlash(void)

{

  GPIO_InitType GPIO_InitStructure;

  

  /* Enable ext.flash GPIO clock */

  RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_AFIO|RCC_APB2PERIPH_GPIOA|RCC_APB2PERIPH_GPIOB, ENABLE);

  

  /* Configure ext.flash pin */

  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pins = GPIO_Pins_8;

  GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pins = GPIO_Pins_1|GPIO_Pins_6|GPIO_Pins_7|GPIO_Pins_10|GPIO_Pins_11;

  GPIO_Init(GPIOB, &GPIO_InitStructure);

  

  /* Select PB10, PB11 as SPIF_TX and SPIF_RX */

  GPIO_PinsRemapConfig(GPIO_Remap_EXT_FLASH, ENABLE);

  GPIO_PinsRemapConfig(AFIO_MAP7_SPIF_1001, ENABLE);

  

  /* In this example, use on-board EN25QH128A as ext.flash */

  FLASH->B3SEL = FLASH_SPIM_TYPE2;

  

  /* Unlock the ext.flash program erase controller */  

  while (BIT_READ(FLASH->STS3, FLASH_STS_BSY));

  FLASH->FCKEY3 = FLASH_KEY1;

  FLASH->FCKEY3 = FLASH_KEY2;

  while (BIT_READ(FLASH->CTRL3, FLASH_CTRL_LCK));

  

  /* If the data written to ext.flash need to be scrambled, please specify the scrambled range */

  FLASH->DA = 0;

  

  return;

}

void ReadPage (unsigned long adr, unsigned long sz, unsigned char *buf)

{

  while (sz)

  {

    *(UINT32 *)buf = *(UINT32 *)adr;    

    sz -= sizeof(UINT32);

    adr += sizeof(UINT32);

    buf += sizeof(UINT32);

  }   

}

void SPIM_test(void)

{

  u16 i=0;

  

  /* Configures the ext.flash */

  printf("init SPIM.\r\n");   

  FLASH_InitExtFlash();

  

  /* Fill the content to be writed to ext.flash */

  for(i=0;i<SPIM_PAGE_SIZE;i++)

  {

    WriteBuffer[i]=i%256;

  }

  

  /* Erases an ext.flash page */

  printf("erase one page.\r\n");

  FLASH_ErasePage(SPIM_TEST_ADDR);

  

  /* Read an ext.flash page */

  memset(ReadBuffer,0,SPIM_PAGE_SIZE);

  ReadPage(SPIM_TEST_ADDR, SPIM_PAGE_SIZE, ReadBuffer);

  

  /* Check if the desired page are erased */

  for(i=0;i<SPIM_PAGE_SIZE;i++)

  {

    if(ReadBuffer[i]!=0xff)

    {

      printf("operate SPIM fail.\r\n");

      return;

    }    

  }

  

  /* Program an ext.flash page */

  printf("write one page.\r\n");

  i=0;

  while(i<SPIM_PAGE_SIZE)

  {

    FLASH_ProgramWord (SPIM_TEST_ADDR+i,*(u32 *)(WriteBuffer+i)); 

    i=i+4;  

  }

  

  /* Read an ext.flash page */

  printf("read one page.\r\n");

  memset(ReadBuffer,0,SPIM_PAGE_SIZE);

  ReadPage(SPIM_TEST_ADDR, SPIM_PAGE_SIZE, ReadBuffer);

  

  /* Check if reading result and writing content are the same */

  printf("compare the WriteBuffer/ReadBuffer.\r\n");

  for(i=0;i<SPIM_PAGE_SIZE;i++)

  {

    if(ReadBuffer[i]!=WriteBuffer[i])

    {

      /* Print the ext.flash testing result */

      printf("test SPIM fail.\r\n");

      return;

    }  

    printf("ReadBuffer[%d] = %d\t", i,ReadBuffer[i]);

  }



  /* Print the ext.flash testing result */

  printf("test SPIM success!\r\n");

}