spidev.c

来自「北京革新公司提供的2410的DA测试程序」· C语言 代码 · 共 55 行

#include "includes.h"
#include "spidev.h"


void spi_init(void)
{
	//SPI0 LED8
	rGPECON &= ~(0x3<<24 | 0x3<<26);
	rGPECON |= (0x2<<24 | 0x2<<26);

	//SPI1 DAC
	//rGPGCON &= ~(0x3<<12 | 0x3<<14);
	rGPGCON |= (0x3<<12 | 0x3<<14);
	rGPBCON &= ~(0x3<<18);
	rGPBCON |=  (0x1<<18);
	rGPBUP |= 0x1<<9;
	//rGPBUP &= ~(0x1<<9);
	rGPBDAT |= 0x1<<9;
}

void spiled_write(U8 *buf, int len)
{
	rSPPRE0=0x0;	//if PCLK=50Mhz,SPICLK=25Mhz
	rSPCON0=(0<<5)|(1<<4)|(1<<3)|(1<<2)|(0<<1)|(0<<0);//Polling,en-SCK,master,low,A,normal
	rSPPIN0=(0<<2)|(1<<1)|(0<<0);//dis-ENMUL,SBO,release

	while(len > 0)
	{
		if(rSPSTA0&0x1)
		{
			rSPTDAT0 = (len--, *buf++);
			while(!(rSPSTA0&0x1));
		}
	}

	rSPCON0=(0<<5)|(0<<4)|(1<<3)|(1<<2)|(0<<1)|(0<<0);
}

void spidac_write(U8 data)
{
	rSPPRE1=0x0;	//if PCLK=50Mhz,SPICLK=25Mhz
	rSPCON1=(0<<5)|(1<<4)|(1<<3)|(1<<2)|(0<<1)|(0<<0);//Polling,en-SCK,master,low,A,normal
	rSPPIN1=(0<<2)|(1<<1)|(0<<0);//dis-ENMUL,SBO,release

	while(!(rSPSTA1&0x1));
	rSPTDAT1 = data;
	while(!(rSPSTA1&0x1));
	rSPCON1=(0<<5)|(0<<4)|(1<<3)|(1<<2)|(0<<1)|(0<<0);

	rGPBDAT &= ~(0x1<<9);
	for(data=0; data<250; data++);
	//OSTimeDly(1);
	rGPBDAT |= (0x1<<9);
}