【AT-START-F407测评】3.运行SPIM示例代码
AT32F407可以通过SPIM外扩SPI接口的flash芯片，AT32F407预留了bank3作为外扩FLASH，闪存模块组织如下：bank1和bank2给内部flash使用，bank3留给外部flash使用，最大容量16M字节。
对bank3的操作与bank1和bank2相同。
硬件接口
接口初始化
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;
}
读page
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);
}
}
测试步骤：
1.擦除
2.写入指定内容
3.读出内容，与写入的比对是否一致。
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%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!=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!=WriteBuffer)
{
/* Print the ext.flash testing result */
printf("test SPIM fail.\r\n");
return;
}
printf("ReadBuffer[%d] = %d\t", i,ReadBuffer);
}
/* Print the ext.flash testing result */
printf("test SPIM success!\r\n");
}
串口打印：
读出的内容与写入的一致。
谢谢分享，很详细
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