spi.c.bak

motorola jw32 usb 源码

//#include <MC68HC908JB16.h> /* include peripheral declarations */

//#define GDO0_PIN    		PTA_PTA4 //input
#define GDO2_PIN    		PTA_PTA4  //input

#define  CC2500_MISO 	 	PTA_PTA6  // Master In / Slave Out (input)
#define  CC2500_MOSI      		PTA_PTA5
#define  CC2500_SCK 	 	   		PTA_PTA7  // Serial Clock (output)
#define  CC2500_NCS 		PTE_PTE1 // Slave Select (output to chip select)


#define  delayus() asm("nop;nop;nop;nop")
/**************************************************
      Name:    IO_RP_Init
      Descrip: 系统IO初始化
      Input:   无
      Output:  无
***************************************************/
unsigned char const rr[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};

/*void SPI_Reset()
{
	CC2500_MOSI = 0;
	CC2500_MISO = 0;
	CC2500_SCK  = 0;
	CC2500_NCS  = 0;
	delayus();
}	 */
//write one byte to spi
void SPIPut (char SPI_byte)
{
unsigned char SPI_count; // counter for SPI transaction
//DisableInterrupts;
for (SPI_count = 0; SPI_count < 8; SPI_count++) // single byte SPI loop
{
    if((SPI_byte &rr[SPI_count] /*0x80*/)>0) // put current outgoing bit on MOSI
    CC2500_MOSI=1;
    else
    CC2500_MOSI=0;

    CC2500_SCK = 0x01; // set SCK high
//    SPI_byte = SPI_byte << 1; // shift next bit into MSB

//SPI_byte |= MISO; // capture current bit on MISO
   // delayus();

    CC2500_SCK = 0x00; // set SCK low
}
 // EnableInterrupts;
}

//read one byte from spi
unsigned char SPIGet ()
{
	unsigned char SPI_count,SPI_data; // counter for SPI transaction
	 //DisableInterrupts;
	SPI_data =0;
	for (SPI_count = 0; SPI_count < 8; SPI_count++) // single byte SPI loop
	{
	//    SPI_data = SPI_data << 1; // shift next bit into MSB
		CC2500_SCK = 0x01; // set SCK high
		//delayus();
	//	SPI_data |= CC2500_MISO; // put current outgoing bit on MOSI
        if(CC2500_MISO)
        SPI_data|=rr[SPI_count];

		CC2500_SCK = 0x00; // set SCK low
		//delayus();
	}
	//EnableInterrupts;
	return SPI_data;
}