STM32-FSMC-NOR FLASH （8） address, memory, FLASH, write

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/******************************************************************************
* Function Name : FSMC_NOR_WriteHalfWord
* Description : Writes a half-word to the NOR memory.
* Input : - WriteAddr : NOR memory internal address to write to.
* - Data : Data to write.
* Output : None
* Return : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
* or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_WriteHalfWord(u32 WriteAddr, u16 Data)
{
NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
NOR_WRITE(ADDR_SHIFT(0x05555), 0x00A0);
NOR_WRITE((Bank1_NOR2_ADDR + WriteAddr), Data);
return (FSMC_NOR_GetStatus(Program_Timeout));
}
/*******************************************************************************
* Function Name : FSMC_NOR_WriteBuffer
* Description : Writes a half-word buffer to the FSMC NOR memory.
* Input : - pBuffer : pointer to buffer.
* - WriteAddr : NOR memory internal address from which the data
* will be written.
* - NumHalfwordToWrite : number of Half words to write.
* Output : None
* Return : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
* or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_WriteBuffer(u16* pBuffer, u32 WriteAddr, u32 NumHalfwordToWrite)
{
NOR_Status status = NOR_ONGOING;
do
{
/* Transfer data to the memory */
status = FSMC_NOR_WriteHalfWord(WriteAddr, *pBuffer++);
WriteAddr = WriteAddr + 2;
NumHalfwordToWrite--;
}
while((status == NOR_SUCCESS) && (NumHalfwordToWrite != 0));

return (status);
}
/*******************************************************************************
* Function Name : FSMC_NOR_ProgramBuffer
* Description : Writes a half-word buffer to the FSMC NOR memory. This function
* must be used only with S29GL128P NOR memory.
* Input : - pBuffer : pointer to buffer.
* - WriteAddr: NOR memory internal address from which the data
* will be written.
* - NumHalfwordToWrite: number of Half words to write.
* The maximum allowed value is 32 Half words (64 bytes).
* Output : None
* Return : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
* or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_ProgramBuffer(u16* pBuffer, u32 WriteAddr, u32 NumHalfwordToWrite)
{
u32 lastloadedaddress = 0x00;
u32 currentaddress = 0x00;
u32 endaddress = 0x00;
/* Initialize variables */
currentaddress = WriteAddr;
endaddress = WriteAddr + NumHalfwordToWrite - 1;
lastloadedaddress = WriteAddr;
/* Issue unlock command sequence */
NOR_WRITE(ADDR_SHIFT(0x005555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
/* Write Write Buffer Load Command */
NOR_WRITE(ADDR_SHIFT(WriteAddr), 0x0025);
NOR_WRITE(ADDR_SHIFT(WriteAddr), (NumHalfwordToWrite - 1));
/* Load Data into NOR Buffer */
while(currentaddress <= endaddress)
{
/* Store last loaded address & data value (for polling) */
lastloadedaddress = currentaddress;

NOR_WRITE(ADDR_SHIFT(currentaddress), *pBuffer++);
currentaddress += 1;
}
NOR_WRITE(ADDR_SHIFT(lastloadedaddress), 0x29);

return(FSMC_NOR_GetStatus(Program_Timeout));
}
/******************************************************************************
* Function Name : FSMC_NOR_ReadHalfWord
* Description : Reads a half-word from the NOR memory.
* Input : - ReadAddr : NOR memory internal address to read from.
* Output : None
* Return : Half-word read from the NOR memory
*******************************************************************************/