你好，我想s12通过SPI通信，但似乎有点问题，程序如下~
void SPIInit(void){
SPI0BR =0b00000001;//clock divisor is 2
SPI0CR2=0b00000010; // SS is not used
SPI0CR1=0b01010000; //as master
}
char getchar_spi0(void)
{
unsigned char te;
while(!(SPI0SR_SPTEF)); /* wait until write is permissible */
SPI0DR = 0x00; /* trigger 8 SCK pulses to shift in data */
while(!(SPI0SR_SPIF)); /* wait until a byte has been shifted in */
te=SPI0DR; // clear the spif flag.
return te; /* return the character */
}
void putchar_spi0 (char cx)
{ char temp;
while(!(SPI0SR_SPTEF)); /* wait until write is permissible */
SPI0DR = cx; /* output the byte to the SPI */
while(!(SPI0SR_SPIF)); /* wait until write operation is complete */
temp=SPI0DR; // clear the spif flag.
}
在Main中是:
while(1){
putchar_spi0(0x0f);
temp=getchar_spi0();
}
在线调试的时候是可以执行的,但用示波器在SCK口没有信号输出,MOSI口也没有信号输出,而且SPI0DR一直都是0,不知道是为什么呢?
假如我在输出0x0f,是不是应该可以在M0SI口看到一定的波形呢?
[此贴子已经被作者于2007-4-24 16:26:31编辑过] | 
