samspi.h

S64和VS1003的MP3播放实现的源代码/

#ifndef _SAMSPI_H_
#define _SAMSPI_H_

/*
	AT91SAM7S64 SPI Pins:   Function (A/B)
	PA12 - MISO - AT91C_PA12_MISO  (1/0)
	PA13 - MOSI - AT91C_PA13_MOSI  (1/0)
	PA14 - SCK  - AT91C_PA14_SPCK  (1/0)
	
	Chip-Selects (available on different pins)
	PA11 - NPCS0 - AT91C_PA11_NPCS0 (1/0)
	PA31 - NPCS1 - AT91C_PA31_NPCS1 (1/0)
	PA09 - NPCS1 - AT91C_PA9_NPCS1  (1/0)
	...AT91C_PA3_NPCS3	(0/1)
	...AT91C_PA5_NPCS3	(0/1)
	...AT91C_PA10_NPCS2	(0/1)
	...AT91C_PA22_NPCS3	(0/1)
	...AT91C_PA30_NPCS2 (0/1)
*/

/* here: use NCPS1 @ PA31: */
#define NPCS_PDR_BIT     (AT91C_PA31_NPCS1 | AT91C_PA22_NPCS3 | AT91C_PA11_NPCS0)
#define NPCS_ASR_BIT     (AT91C_PA31_NPCS1 | AT91C_PA11_NPCS0)
#define NPCS_BSR_BIT     AT91C_PA22_NPCS3

#define SPI_CSR_NUM      1          

#define SPI_SCBR_MIN     2

/* PCS_0 for NPCS0, PCS_1 for NPCS1 ... */
/*
#define PCS_0 ((0<<0)|(1<<1)|(1<<2)|(1<<3))
#define PCS_1 ((1<<1)|(0<<1)|(1<<2)|(1<<3))
#define PCS_2 ((1<<1)|(1<<1)|(0<<2)|(1<<3))
#define PCS_3 ((1<<1)|(1<<1)|(1<<2)|(0<<3))
*/
#define PCS_0 0x0E
#define PCS_1 0x0D
#define PCS_2 0x0B
#define PCS_3 0x07

#if (SPI_CSR_NUM == 0)
#define SPI_MR_PCS       PCS_0
#elif (SPI_CSR_NUM == 1)
#define SPI_MR_PCS       PCS_1
#elif (SPI_CSR_NUM == 2)
#define SPI_MR_PCS       PCS_2
#elif (SPI_CSR_NUM == 3)
#define SPI_MR_PCS       PCS_3
#else
#error "SPI_CSR_NUM invalid"
// not realy - when using an external address decoder...
// but this code takes over the complete SPI-interace anyway
#endif

void SAMspiSetSCBR(unsigned char ch, unsigned char baudrate);
void SAMspiCfgCH(unsigned char ch, unsigned int mode);
unsigned short SAMspiSend(unsigned char ch, unsigned short data);
void SAMspiInit(void);

#endif