我简单的把timer0 pwm 代码和 cmos 代码结合在一起，不成功：PPI中断没有运行:

void Init_Interrupts(void)
{
    *pSIC_IAR0 = 0xffffffff;
    //*pSIC_IAR1 = 0xffffffff;   //这句代码一打开，PPI中断就不运行了，不能显示640*480那句提示了
    *pSIC_IAR2 = 0xfffffff4;                    
    register_handler(ik_ivg11, TIMER0_ISR);        
    *pSIC_IMASK = 0x00010000;
    
    *pSIC_IAR0 = *pSIC_IAR0 & 0xffffffff | 0x00000000;    
    *pSIC_IAR1 = *pSIC_IAR1 & 0xffffffff | 0x00000001;    
    *pSIC_IAR2 = *pSIC_IAR2 & 0xffffffff | 0x00000000;                                                        
    register_handler(ik_ivg8, DMA0_PPI_ISR);        

    *pSIC_IMASK= *pSIC_IMASK & 0xffffffff | 0x00000100; //原来这里直接是 =0x100；    
}

EX_INTERRUPT_HANDLER(TIMER0_ISR)
{
    *pTIMER_STATUS = 0x0001;
    //printf("timer0 interrupt !\n");
}

EX_INTERRUPT_HANDLER(DMA0_PPI_ISR)
{    
        *pDMA0_IRQ_STATUS = 0x1;  
        *pPPI_CONTROL &= 0xfffe;
        printf( "\nSuccess Capture One Frame:  640 * 480\n");
        printf( "                 YUYV422(YUV422) Format\n" );
        printf( "                 The data address is 0 \n" );
}

代码逻辑上没有什么问题。但建议你将void Init_Interrupts(void)函数中的两次初始化中断寄存器整合为一次初始化，相同的寄存器没有必要写两便。

PPI中断消失可能是timer0中断过快影响了ＰＰＩＤＭＡ中断。你把ＴＩＭＥＲ０的周期改的足够大，看是否有ＰＰＩ中断。