下面是初始化程序，请大家帮我看看 为什么进不了中断？？
void InitUSART0(void)
{
AT91C_BASE_PIOA->PIO_PDR = DMX_RXD | DMX_TXD ; //Disables the PIO from controlling the corresponding pin (enables peripheral control of the pin).
AT91C_BASE_PIOA->PIO_ASR = DMX_RXD | DMX_TXD; //Assigns the I/O line to the Peripheral A function.
AT91C_BASE_PIOA->PIO_BSR = 0; //Assigns the I/O line to the Peripheral B function.
//enable the clock of USART
AT91C_BASE_PMC->PMC_PCER = 1<<AT91C_ID_US0;
//Set the USART mode
AT91C_BASE_US0->US_MR = AT91C_US_USMODE_NORMAL | //普通模式
AT91C_US_CLKS_CLOCK & //时钟为MCK
~AT91C_US_SYNC | //异步模式
AT91C_US_PAR_NONE | //无校验
AT91C_US_NBSTOP_1_BIT | //一位停止位
AT91C_US_MODE9 & //9位数据位
~AT91C_US_OVER //16 倍重采样。OVER=0
;
//write the Timeguard Register
AT91C_BASE_US0->US_TTGR = 0;
//set baud rate divisor register
AT91C_BASE_US0->US_BRGR = BAUD_CD; //((47923200)/(250000x16))
//Enable the RX and TX PDC transfer requests
//AT91C_BASE_PDC_US0->PDC_PTCR = AT91C_PDC_TXTEN | AT91C_PDC_RXTEN;
//Enable usart
AT91C_BASE_US0->US_CR = AT91C_US_RXEN | AT91C_US_TXEN; // 0x50;
//使能接收结束中断＆发送结束中断
AT91C_BASE_US0->US_IMR = AT91C_US_ENDRX | AT91C_US_ENDTX ;
//在AIC中设置US0中断优先级、中断入口、中断方式
AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC,
AT91C_ID_US0,
US0_INTERRUPT_LEVEL,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL,
US0_irq_handler
);
//在AIC中使能US0中断
AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_TC0);
} |
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