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器件用的是AT91M40800

写了一段用于与PC串口通信的程序,但开发板上串口没有信号输出

请问问题出在哪儿啊?

PS_PCER=ox00000004;//

PIO_PDR=0x0000C000;//DISABLE (TX0/RX0) PIO

US0_MR=0x000008C0 ;//SET MODE 8BIT 1BIT STOP MCK

US0_IDR=0XFFFFFFFF;//DISABLE INTERRUPT OF US0

US0_BRGR=65; //SET BAUD RATE (MCK 10M 9600BIT)

US0_CR=0X10C;//RESET TX0/RX0

US0_CR=0X50;//ENABLE TX0/RX0

while(1)

{

if(US0_CSR&&0x00000200) //judge buffer empty

US0_THR=0X5;

}

居然无信号输出,郁闷!!