大家好:
我的程序在读写sst25vf512只能读,不能写,读取ID都是正确的,擦除也可以,就是不能写。我觉得可能是初始化时某个寄存器没有配置正确,但是不知道怎么弄,特请教大家。下面是程序
#define SPI_FLASH_PageSize 256
#define WRITE 0x02 /* Write to Memory instruction */
#define WRSR 0x01 /* Write Status Register instruction */
#define WREN 0x06 /* Write enable instruction */
#define READ 0x03 /* Read from Memory instruction */
#define RDSR 0x05 /* Read Status Register instruction */
#define RDID 0x90 /* Read identification */
#define SE 0x20 /* Sector Erase instruction */
#define BE 0x52 /* Bulk Erase instruction */
#define WIP_Flag 0x01 /* Write In Progress (WIP) flag */
#define Dummy_Byte 0xff
/* Select SPI FLASH: ChipSelect pin low */
#define SPI_FLASH_CS_LOW() GPIO_ResetBits(GPIOC, GPIO_Pin_5)
/* Deselect SPI FLASH: ChipSelect pin high */
#define SPI_FLASH_CS_HIGH() GPIO_SetBits(GPIOC, GPIO_Pin_5)
void SPI_FLASH_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable SPI1 GPIOA and GPIOB clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA |RCC_APB2Periph_GPIOB, ENABLE);
/* Configure SPI1 pins: NSS, SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure PC.05 as Output push-pull, used as Flash Chip select */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Deselect the FLASH: Chip Select high */
SPI_FLASH_CS_HIGH();
/* SPI1 configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);
}
void SPI_FLASH_BufferWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{
u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0, temp = 0;
Addr = WriteAddr % SPI_FLASH_PageSize;
count = SPI_FLASH_PageSize - Addr;
NumOfPage = NumByteToWrite / SPI_FLASH_PageSize;
NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;
if(Addr == 0) /* WriteAddr is SPI_FLASH_PageSize aligned */
{
if(NumOfPage == 0) /* NumByteToWrite < SPI_FLASH_PageSize */
{
SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
}
else /* NumByteToWrite > SPI_FLASH_PageSize */
{
while(NumOfPage--)
{
SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
WriteAddr += SPI_FLASH_PageSize;
pBuffer += SPI_FLASH_PageSize;
}
SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);
}
}
else /* WriteAddr is not SPI_FLASH_PageSize aligned */
{
if(NumOfPage== 0) /* NumByteToWrite < SPI_FLASH_PageSize */
{
if(NumOfSingle > count) /* (NumByteToWrite + WriteAddr) > SPI_FLASH_PageSize */
{
temp = NumOfSingle - count;
SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);
WriteAddr += count;
pBuffer += count;
SPI_FLASH_PageWrite(pBuffer, WriteAddr, temp);
}
else
{
SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
}
}
else /* NumByteToWrite > SPI_FLASH_PageSize */
{
NumByteToWrite -= count;
NumOfPage = NumByteToWrite / SPI_FLASH_PageSize;
NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;
SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);
WriteAddr += count;
pBuffer += count;
while(NumOfPage--)
{
SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
WriteAddr += SPI_FLASH_PageSize;
pBuffer += SPI_FLASH_PageSize;
}
if(NumOfSingle != 0)
{
SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);
}
}
}
}
void SPI_FLASH_PageWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{
/* Enable the write access to the FLASH */
SPI_FLASH_WriteEnable();
/* Select the FLASH: Chip Select low */
SPI_FLASH_CS_LOW();
/* Send "Write to Memory " instruction */
SPI_FLASH_SendByte(WRITE);
/* Send WriteAddr high nibble address byte to write to */
SPI_FLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
/* Send WriteAddr medium nibble address byte to write to */
SPI_FLASH_SendByte((WriteAddr & 0xFF00) >> 8);
/* Send WriteAddr low nibble address byte to write to */
SPI_FLASH_SendByte(WriteAddr & 0xFF);
/* while there is data to be written on the FLASH */
while(NumByteToWrite--)
{
/* Send the current byte */
SPI_FLASH_SendByte(*pBuffer);
/* Point on the next byte to be written */
pBuffer++;
}
/* Deselect the FLASH: Chip Select high */
SPI_FLASH_CS_HIGH();
/* Wait the end of Flash writing */
SPI_FLASH_WaitForWriteEnd();
}
void SPI_FLASH_WriteEnable(void)
{
vu8 sta;
/* Select the FLASH: Chip Select low */
SPI_FLASH_CS_LOW();
/* Send "Write Enable" instruction */
SPI_FLASH_SendByte(WREN);
/* Deselect the FLASH: Chip Select high */
SPI_FLASH_CS_HIGH();
}
/*******************************************************************************
* Function Name : SPI_FLASH_WaitForWriteEnd
* Description : Polls the status of the Write In Progress (WIP) flag in the
* FLASH's status register and loop until write opertaion
* has completed.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SPI_FLASH_WaitForWriteEnd(void)
{
u8 FLASH_Status = 0;
/* Select the FLASH: Chip Select low */
SPI_FLASH_CS_LOW();
/* Send "Read Status Register" instruction */
SPI_FLASH_SendByte(RDSR);
/* Loop as long as the memory is busy with a write cycle */
do
{
/* Send a dummy byte to generate the clock needed by the FLASH
and put the value of the status register in FLASH_Status variable */
FLASH_Status = SPI_FLASH_SendByte(Dummy_Byte);
} while((FLASH_Status & WIP_Flag) == SET); /* Write in progress */
/* Deselect the FLASH: Chip Select high */
SPI_FLASH_CS_HIGH();
}
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