/*******************************************************************************
MicroSD initialization return: 0x00=success
*******************************************************************************/
u8 MSD_Init(void)
{ u32 i=0;
SPI_Config();
MSD_CS_HIGH();
for(i=0; i <10; i++) MSD_WriteByte(DUMMY); //Send dummy byte: 8 Clock pulses of delay
return MSD_GoIdleState();
}
u8 MSD_Init(void)
{
u32 i = 0;
/* Initialize SPI1 */
spi_init();
/* MSD chip select high */
spi_ss(_FLASH_NUM0,1);
/* Send dummy byte 0xFF, 10 times with CS high*/
/* rise CS and MOSI for 80 clocks cycles */
for (i = 0; i <= 9; i++)
{
/* Send dummy byte 0xFF */
spi_send(DUMMY);
}
/*------------Put MSD in SPI mode--------------*/
/* MSD initialized and set to SPI mode properly */
return (MSD_GoIdleState());
}
/*******************************************************************************
* Function Name : MSD_Init
* Description : Initializes the MSD/SD communication.
* Input : None
* Output : None
* Return : The MSD Response: - MSD_RESPONSE_FAILURE: Sequence failed
* - MSD_RESPONSE_NO_ERROR: Sequence succeed
*******************************************************************************/
u8 MSD_Init(void)
{
u32 i = 0;
RCC->APB2ENR|=1<<2; //PORTA时钟使能
GPIOA->CRL&=0XFFF000FF;
GPIOA->CRL|=0X00033300;//PA2.3.4 推挽
GPIOA->ODR|=0X7<<2; //PA2.3.4上拉
SPIx_Init();
SPIx_SetSpeed(SPI_SPEED_256);//设置到低速模式
/* MSD chip select high */
Set_SD_CS;
/* Send dummy byte 0xFF, 10 times with CS high*/
/* rise CS and MOSI for 80 clocks cycles */
for (i = 0; i <= 9; i++)
{
/* Send dummy byte 0xFF */
MSD_WriteByte(DUMMY);
}
/*------------Put MSD in SPI mode--------------*/
/* MSD initialized and set to SPI mode properly */
return (MSD_GoIdleState());
}
