spi.c

ADI系列DSP blackfin BF533 触摸屏 基于亿旗的开发板

//************************************************//
//** file: spi.c
//** target: ADSP-BF533
//** creat time: 2008-8-19
#include <ccblkfn.h>
#include <cdefBF533.h>
#include "sys_func.h"

//SPI interface funtion
void SPI_Init(void)
{
	*pSPI_BAUD = (unsigned short)(GetSCLK() / (2 * 5000000)); // 5MHz
	//SPI enable,master mode,CPHA=1(control by software),
	//16 bit,Start transfer with write of SPI_TDBR
	*pSPI_CTL = 0x5501; 
	*pSPI_FLG = 0xFF20; // SPISEL5 enabled
}

//SPI send a word function
void SPI_send_data(unsigned short data)
{
 *pSPI_TDBR = data;
 while ((*pSPI_STAT & 0x0001) == 0) ;
 Delay(1000);
}

//SPI receive a word function
unsigned short SPI_receive_data(void)
{
	SPI_send_data(0xFFFF);
	return (*pSPI_RDBR);
}

//SPI RDBR clear
void SPI_RDBR_Clr(void)
{ 
	unsigned char buf; 

	while (*pSPI_STAT & 0x0020) 
		buf = *pSPI_RDBR; 
}