我使用F28027。程序中使用SPI，只发送数据，用三条线：
SpiaRegs.***.all = 0x007; // 8-bit character, SPI reset
SpiaRegs.***.bit.OVERRUNINTENA = 1;
SpiaRegs.***.bit.CLK_PHASE = 1;
SpiaRegs.***.bit.MASTER_SLAVE = 1;
SpiaRegs.***.bit.TALK = 1;
SpiaRegs.***.bit.SPIINTENA = 0;
SpiaRegs.***.bit.CLKPOLARITY = 0;
SpiaRegs.***.bit.*** = 7; // 8-bit character, nomal mode
SpiaRegs.SPISTS.all = 0x00E0; // Clear flag
SpiaRegs.SPIBRR = 0x05; // Baud rate, = LSPCLK /( SPIBRR + 1 ), iboudrate is 15MHz as BRR= 3
SpiaRegs.***.bit.SPISWRESET=1;
SpiaRegs.SPIPRI.all = 0x0011;
使用了ADC，用PWM触发：
AdcRegs.INTSEL1N2.bit.INT1E = 1; // enable
AdcRegs.INTSEL1N2.bit.INT1SEL = 3; // EOC3 is trigger for ADCINT1
AdcRegs.INTSEL1N2.bit.INT1CONT = 1; // Enable ADCINT1 Continuous mode
ADC中断处理是使用汇编语言编写的。
当打开ADC中断后，就会一直停在这一句：
while (SpiaRegs.SPISTS.bit.INT_FLAG != 1){}
但把ADC中断关闭后，SPI发送正常。其发送程序是：
Uint16 WriteData(Uint16 Data)
{
Uint16 dummy;
A0SET_TO_DATA(); // GPIO17
dummy = SpiaRegs.SPIRXBUF;
SpiaRegs.SPITXBUF = Data << 8 ;
while (SpiaRegs.SPISTS.bit.INT_FLAG != 1){}
SpiaRegs.SPISTS.all = 0xFF;
dummy = SpiaRegs.SPITXBUF;
return dummy;
}
请大伙帮忙，看看问题到底出在哪里。谢谢大家
