ARM单片机UART的问题

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ARM单片机UART的问题 [复制链接]

#include<stdio.h>
#include<lpc23xx.h>   
#define baudrate 115200
#define Fpclk  60000000/4
void Init_uart()
{
unsigned long Fdiv;
    PINSEL0 &= ~((1<<5)|(1<<7));       /* RxD0 and TxD0 */
PINSEL0 |= (1<<6)|(1<<4);       /* RxD0 and TxD0 */  
U0LCR = 0x83;  /* 8 bits, no Parity, 1 Stop bit */
    Fdiv = ( Fpclk / 16 ) / baudrate ; /*baud rate */
    U0DLM = Fdiv / 256;      
    U0DLL = Fdiv % 256;
U0LCR = 0x03;  /* DLAB = 0 */
    U0FCR = 0x07;  /* Enable and reset TX and RX FIFO. */
}
      
void UARTSend_String( unsigned long portNum, unsigned char *BufferPtr)
{
while ( *BufferPtr!='\0')
    {
   U0THR = *BufferPtr;   
   while((U0LSR&0x40)==0);   
   BufferPtr++;  
}
}
int main()
{
Init_uart();
while(1)
{
  UARTSend_String(0,"hello");
}
}
上面是我的程序，编译是对的，就是发不了，请问是什么问题。本人菜鸟，请详细解答，谢谢！！