Question

stm32怎样将数组存到flash？存到flash中的数组怎样读取出来？

Answer 1

先初始化FSMC
void FSMC_NAND_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
FSMC_NANDInitTypeDef FSMC_NANDInitStructure;
FSMC_NAND_PCCARDTimingInitTypeDef p;

/* Enable FSMC, GPIOD, GPIOE and AFIO clocks */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE |
RCC_APB2Periph_GPIOG | RCC_APB2Periph_AFIO , ENABLE);

/*-- GPIO Configuration ------------------------------------------------------*/
/* CLE, ALE, D0->D3, NOE, NWE and NCE2 NAND pin configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_14 | GPIO_Pin_15 |
GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);

/* D4->D7 NAND pin configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10;
GPIO_Init(GPIOE, &GPIO_InitStructure);

/* CS NAND pin configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIOG, &GPIO_InitStructure);

/* NWAIT NAND pin configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOD, &GPIO_InitStructure);

/*-- FSMC Configuration ------------------------------------------------------*/
p.FSMC_SetupTime = 0x1;
p.FSMC_WaitSetupTime = 0x3;
p.FSMC_HoldSetupTime = 0x2;
p.FSMC_HiZSetupTime = 0x1;

FSMC_NANDInitStructure.FSMC_Bank = FSMC_Bank3_NAND;
FSMC_NANDInitStructure.FSMC_Waitfeature = FSMC_Waitfeature_Enable;
FSMC_NANDInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_8b;
FSMC_NANDInitStructure.FSMC_ECC = FSMC_ECC_Enable;
FSMC_NANDInitStructure.FSMC_ECCPageSize = FSMC_ECCPageSize_512Bytes;
FSMC_NANDInitStructure.FSMC_TCLRSetupTime = 0x00;
FSMC_NANDInitStructure.FSMC_TARSetupTime = 0x00;
FSMC_NANDInitStructure.FSMC_CommonSpaceTimingStruct = &p;
FSMC_NANDInitStructure.FSMC_AttributeSpaceTimingStruct = &p;

FSMC_NANDInit(&FSMC_NANDInitStructure);

/* FSMC NAND Bank Cmd Test */
FSMC_NANDCmd(FSMC_Bank3_NAND, ENABLE);
}
定义一个写函数
uint32_t FSMC_NAND_WriteSmallPage(uint8_t *pBuffer, NAND_ADDRESS Address, uint32_t NumPageToWrite)
{
uint32_t index = 0x00, numpagewritten = 0x00, addressstatus = NAND_VALID_ADDRESS;
uint32_t status = NAND_READY, size = 0x00;
uint8_t Page = 0x37;
while((NumPageToWrite != 0x00) && (addressstatus == NAND_VALID_ADDRESS) && (status == NAND_READY))
{
/* Page write command and address */
*(vu8 *)(NAND_FLASH_START_ADDR | CMD_AREA) = NAND_CMD_PAGEPROGRAM;

*(vu8 *)(NAND_FLASH_START_ADDR | ADDR_AREA) = 0x00;
*(vu8 *)(NAND_FLASH_START_ADDR | ADDR_AREA) = 0X00;
*(vu8 *)(NAND_FLASH_START_ADDR | ADDR_AREA) = ADDR_1st_CYCLE(ROW_ADDRESS);
*(vu8 *)(NAND_FLASH_START_ADDR | ADDR_AREA) = ADDR_2nd_CYCLE(ROW_ADDRESS);

/* Calculate the size */
size = Page + (Page * numpagewritten);

/* Write data */
for(; index < size; index++)
{
*(vu8 *)(NAND_FLASH_START_ADDR | DATA_AREA) = pBuffer[index];
}

*(vu8 *)(NAND_FLASH_START_ADDR | CMD_AREA) = NAND_CMD_PAGEPROGRAM_TRUE;

/* 读忙脚 */
// while( GPIO_ReadInputDataBit(GPIOG, GPIO_Pin_6) == 0 );
// while( GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6) == 0 );

/* Check status for successful operation */
status = FSMC_NAND_GetStatus();

if(status == NAND_READY)
{
numpagewritten++;

NumPageToWrite--;

/* Calculate Next small page Address */
addressstatus = FSMC_NAND_AddressIncrement(&Address);
}
}

return (status | addressstatus);
}
定义一个数组TxBuffer，然后将数组写入flash
FSMC_NAND_WriteSmallPage(TxBuffer, WriteAddr, 1);
读的过程相反，定义读取函数
uint32_t FSMC_NAND_ReadSmallPage(uint8_t *pBuffer, NAND_ADDRESS Address, uint32_t NumPageToRead)
{
uint32_t index = 0x00, numpageread = 0x00, addressstatus = NAND_VALID_ADDRESS;
uint32_t status = NAND_READY, size = 0x00;
uint8_t Page = 0x37;
while((NumPageToRead != 0x0) && (addressstatus == NAND_VALID_ADDRESS))
{
/* Page Read command and page address */
*(vu8 *)(NAND_FLASH_START_ADDR | CMD_AREA) = NAND_CMD_READ_1;

*(vu8 *)(NAND_FLASH_START_ADDR | ADDR_AREA) = 0x00;
*(vu8 *)(NAND_FLASH_START_ADDR | ADDR_AREA) = 0X00;
*(vu8 *)(NAND_FLASH_START_ADDR | ADDR_AREA) = ADDR_1st_CYCLE(ROW_ADDRESS);
*(vu8 *)(NAND_FLASH_START_ADDR | ADDR_AREA) = ADDR_2nd_CYCLE(ROW_ADDRESS);

*(vu8 *)(NAND_FLASH_START_ADDR | CMD_AREA) = NAND_CMD_READ_TRUE;

/* 读忙脚 */
// while( GPIO_ReadInputDataBit(GPIOG, GPIO_Pin_6) == 0 );
// while( GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6) == 0 );

/* Calculate the size */
size = Page + (Page * numpageread);

/* Get Data into Buffer */
for(; index < size; index++)
{
pBuffer[index]= *(vu8 *)(NAND_FLASH_START_ADDR | DATA_AREA);
}

numpageread++;

NumPageToRead--;

/* Calculate page address */
addressstatus = FSMC_NAND_AddressIncrement(&Address);
}

status = FSMC_NAND_GetStatus();

return (status | addressstatus);
}