#define CFG_DRIVE 4
//------------- <<< end of configuration section >>> -----------------------
#if CFG_DRIVE == 2
#define SPI_CS 0
#define SPI_SS AT91C_PA21_SPI1_NPCS0 /* SPI DATA Flash */
#else
#define SPI_CS 1
#define SPI_SS AT91C_PA25_SPI1_NPCS1 /* SPI SD Card */
#endif
#define SPI_PCS (~(1<<SPI_CS) & 0x0F) /* set PCS according CS */
#define RDRF 0x00000001
#define TDRE 0x00000002
/*----------------------------------------------------------------------------
* SPI Driver Functions
*----------------------------------------------------------------------------
* Required functions for SPI driver module:
* - void spi_init ()
* - void spi_ss (U32 ss)
* - U8 spi_send (U8 outb)
* - void spi_hi_speed (BOOL on)
*---------------------------------------------------------------------------*/
/*--------------------------- spi_init --------------------------------------*/
void spi_init (void) {
/* Initialize and enable the SSP Interface module. */
/* Enable Clocks */
AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_PIOA) |
(1 << AT91C_ID_SPI1) ;
/* SPI1_MISO, SPI1_MOSI, SPI1_SPCK are SPI1 pins */
AT91C_BASE_PIOA->PIO_ASR = AT91C_PA24_SPI1_MISO |
AT91C_PA23_SPI1_MOSI |
AT91C_PA22_SPI1_SPCK ;//16 17 18
AT91C_BASE_PIOA->PIO_PDR = AT91C_PA24_SPI1_MISO |
AT91C_PA23_SPI1_MOSI |
AT91C_PA22_SPI1_SPCK ;
/* SPIO_NPCS1 is GPIO, output set to high. */
AT91C_BASE_PIOA->PIO_PER = SPI_SS;
AT91C_BASE_PIOA->PIO_OER = SPI_SS;
AT91C_BASE_PIOA->PIO_SODR = SPI_SS;
/* Initialize SPI1 Controller */
AT91C_BASE_SPI1->SPI_CR = AT91C_SPI_SWRST;
AT91C_BASE_SPI1->SPI_MR = AT91C_SPI_MSTR | AT91C_SPI_MODFDIS;
/* Set DLYBCT = 0(10ns), DLYBS = 15(300ns), SBCR = 3(16MHz SPI clock) */
AT91C_BASE_SPI1->SPI_CSR[SPI_CS] = AT91C_SPI_CPOL | AT91C_SPI_BITS_8 |
(0 << 24) | (15 << 16) | (3 << 8) ;
/* Use NPCSx as chip select. */
AT91C_BASE_SPI1->SPI_MR &= 0xFF0FFFFF;
AT91C_BASE_SPI1->SPI_MR |= ((SPI_PCS<<16) & AT91C_SPI_PCS);
AT91C_BASE_SPI1->SPI_CR = AT91C_SPI_SPIEN;
}
/*--------------------------- spi_hi_speed ----------------------------------*/
void spi_hi_speed (BOOL on) {
/* Set a SPI clock to low/high speed for SD/MMC. */
U32 csr;
csr = AT91C_BASE_SPI1->SPI_CSR[SPI_CS] & 0xFFFF00FF;
if (on == __TRUE) {
/* Max. 16 MBit used for Data Transfer. */
AT91C_BASE_SPI1->SPI_CSR[SPI_CS] = csr | (3 << 8);
}
else {
/* Max. 400 kBit used in Card Initialization. */
/* here we use 600 kBit */
AT91C_BASE_SPI1->SPI_CSR[SPI_CS] = csr | (80 << 8);
}
}
#define SPI_CS 1 #define SPI_SS AT91C_PA13_SPI0_NPCS1 /* SPI SD Card */
#define SPI_CS 3 #define SPI_SS AT91C_PA15_SPI0_NPCS3
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