标题:
STM32-FSMC-NOR FLASH(7)
[打印本页]
作者:
yuyang911220
时间:
2015-5-29 18:23
标题:
STM32-FSMC-NOR FLASH(7)
/******************************************************************************
* Function Name : FSMC_NOR_ReturnToReadMode
* Description : Returns the NOR memory to Read mode.
* Input : None
* Output : None
* Return : NOR_SUCCESS
*******************************************************************************/
NOR_Status FSMC_NOR_ReturnToReadMode(void)
{
NOR_WRITE(Bank1_NOR2_ADDR, 0x00F0);
return (NOR_SUCCESS);
}
/******************************************************************************
* Function Name : FSMC_NOR_Reset
* Description : Returns the NOR memory to Read mode and resets the errors in
* the NOR memory Status Register.
* Input : None
* Output : None
* Return : NOR_SUCCESS
*******************************************************************************/
NOR_Status FSMC_NOR_Reset(void)
{
NOR_WRITE(ADDR_SHIFT(0x005555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x002AAA), 0x0055);
NOR_WRITE(Bank1_NOR2_ADDR, 0x00F0);
return (NOR_SUCCESS);
}
/******************************************************************************
* Function Name : FSMC_NOR_GetStatus
* Description : Returns the NOR operation status.
* Input : - Timeout: NOR progamming Timeout
* Output : None
* Return : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
* or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_GetStatus(u32 Timeout)
{
u16 val1 = 0x00, val2 = 0x00;
NOR_Status status = NOR_ONGOING;
u32 timeout = Timeout;
/* Poll on NOR memory Ready/Busy signal ------------------------------------*/
while((GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6) != RESET) && (timeout > 0))
{
timeout--;
}
timeout = Timeout;
while((GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6) == RESET) && (timeout > 0))
{
timeout--;
}
/* Get the NOR memory operation status -------------------------------------*/
while((Timeout != 0x00) && (status != NOR_SUCCESS))
{
Timeout--;
/* Read DQ6 and DQ5 */
val1 = *(vu16 *)(Bank1_NOR2_ADDR);
val2 = *(vu16 *)(Bank1_NOR2_ADDR);
/* If DQ6 did not toggle between the two reads then return NOR_Success */
if((val1 & 0x0040) == (val2 & 0x0040))
{
return NOR_SUCCESS;
}
if((val1 & 0x0020) != 0x0020)
{
status = NOR_ONGOING;
}
欢迎光临 电子技术论坛_中国专业的电子工程师学习交流社区-中电网技术论坛 (http://bbs.eccn.com/)
Powered by Discuz! 7.0.0