uart.h

ARM9的串口开发实例

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#define  WrUTXH0(ch) (*(volatile unsigned char *)0x50000020)=(unsigned char)(ch)
#define  WrUTXH1     (*(volatile unsigned char *)0x50004020)
#define  WrUTXH2(ch) (*(volatile unsigned char *)0x50008020)=(unsigned char)(ch)

// UART
#define rULCON0     (*(volatile unsigned *)0x50000000) //UART 0 Line control
#define rUCON0      (*(volatile unsigned *)0x50000004) //UART 0 Control
#define rUFCON0     (*(volatile unsigned *)0x50000008) //UART 0 FIFO control
#define rUMCON0     (*(volatile unsigned *)0x5000000c) //UART 0 Modem control
#define rUTRSTAT0   (*(volatile unsigned *)0x50000010) //UART 0 Tx/Rx status
#define rUERSTAT0   (*(volatile unsigned *)0x50000014) //UART 0 Rx error status
#define rUFSTAT0    (*(volatile unsigned *)0x50000018) //UART 0 FIFO status
#define rUMSTAT0    (*(volatile unsigned *)0x5000001c) //UART 0 Modem status
#define rUBRDIV0    (*(volatile unsigned *)0x50000028) //UART 0 Baud rate divisor



#define rULCON1     (*(volatile unsigned *)0x50004000) //UART 1 Line control
#define rUCON1      (*(volatile unsigned *)0x50004004) //UART 1 Control
#define rUFCON1     (*(volatile unsigned *)0x50004008) //UART 1 FIFO control
#define rUMCON1     (*(volatile unsigned *)0x5000400c) //UART 1 Modem control
#define rUTRSTAT1   (*(volatile unsigned *)0x50004010) //UART 1 Tx/Rx status
#define rUERSTAT1   (*(volatile unsigned *)0x50004014) //UART 1 Rx error status
#define rUFSTAT1    (*(volatile unsigned *)0x50004018) //UART 1 FIFO status
#define rUMSTAT1    (*(volatile unsigned *)0x5000401c) //UART 1 Modem status
#define rUBRDIV1    (*(volatile unsigned *)0x50004028) //UART 1 Baud rate divisor

#define rULCON2     (*(volatile unsigned *)0x50008000) //UART 2 Line control
#define rUCON2      (*(volatile unsigned *)0x50008004) //UART 2 Control
#define rUFCON2     (*(volatile unsigned *)0x50008008) //UART 2 FIFO control
#define rUMCON2     (*(volatile unsigned *)0x5000800c) //UART 2 Modem control
#define rUTRSTAT2   (*(volatile unsigned *)0x50008010) //UART 2 Tx/Rx status
#define rUERSTAT2   (*(volatile unsigned *)0x50008014) //UART 2 Rx error status
#define rUFSTAT2    (*(volatile unsigned *)0x50008018) //UART 2 FIFO status
#define rUMSTAT2    (*(volatile unsigned *)0x5000801c) //UART 2 Modem status
#define rUBRDIV2    (*(volatile unsigned *)0x50008028) //UART 2 Baud rate divisor


#define RdURXH0()   (*(volatile unsigned char *)0x50000024)
#define RdURXH1()   (*(volatile unsigned char *)0x50004024)
#define RdURXH2()   (*(volatile unsigned char *)0x50004024)

#define rMPLLCON    (*(volatile unsigned *)0x4c000004) //MPLL Control
#define rCLKDIVN    (*(volatile unsigned *)0x4c000014) //Clock divider control



#define		Baud		9600//串口波特率
#define	DFT_FCLK_VAL	 ((192<<12)|(4<<4)|1)
#define	EXT_XTAL_FREQ	12000000
static unsigned char sCLKDIVN;