用SPI对一器件做读写操作，过程如下：
#define SPI0_CS = (1<<24)
PINSEL0 = 0x00005500; // 设置SPI管脚连接
PINSEL1 = 0x00000000;
IO1DIR = SPI0_CS;
IO1SET = SPI0_CS;
S0PCCR = 0x52; // 设置SPI时钟分频, 初始化SPI接口
S0PCR=0x38;//下降沿发送，上升沿接收
void SPI0_WR8(uint8 Addr,uint8 Dta)
{
IO1CLR=SPI0_CS;
S0PDR = Addr|0x80;
while( 0==(S0PSR&0x80) );
S0PDR = Dta;
while( 0==(S0PSR&0x80) );
IO1SET|=SPI0_CS;
}
uint8 SPI0_RD8(uint8 Addr)
{
uint8 u8temp;
IO1CLR=SPI0_CS;
S0PDR = Addr;
while( 0==(S0PSR&0x80) );
DelayNS(1);
S0PDR = 0xff;
while( 0==(S0PSR&0x80) );
u8temp=S0PDR;
IO1SET|=SPI0_CS;
return (u8temp);
}
我先向器件的可读写寄存器中写入数据后再读怎么读不出来？
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