test_uart2_485.c

arm9.rar

#include "def.h"
#include "2410addr.h"
#include "config.h"
#include "board.h"
#include "utils.h"

#define	En485Tx()	(rGPEDAT |= 1<<13)
#define	En485Rx()	(rGPEDAT &= ~(1<<13))

static __inline void set_io(void)
{
    rGPHCON &= ~(0xf<<12);
    rGPHCON |= 0xa<<12;		//TXD2,RXD2
    rGPHUP  |= 3<<6;		//Uart port pull-up disable

	rGPGCON &= ~((3<<4)|(3<<12));
	rGPGCON |= (1<<4)|(1<<12);
	rGPGDAT &= ~(1<<2);
	rGPGDAT |= 1<<6;
	
	rGPECON &= ~(3<<26);
	rGPECON |= 1<<26;
	En485Rx();
}

static __inline void reset_io(void)
{
    rGPHCON |= 0xf<<12;		//RTS1, CTS1
}

void Test_Uart2_485(void)
{
	U16 m ;
	U32 baud;
	
	printf("485 通讯实验, please select baud rate\n1: 9600\n2: 19200\n3: 57600\n4: 115200\n");
	
	while(1) {
		m = getch();
		if(m>='1'&&m<='4')
			break;
		if(m==ESC_KEY)
			return;
	}
	
	set_io();
	
	switch(m) {

	case '1':
		baud = 9600;
		break;
	
	case '2':
		baud = 19200;
		break;

	case '3':
		baud = 57600;
		break;

	default:
		baud = 115200;
	}
	
	printf("set UART2 baud rate to %d\n", baud);

	rUFCON2 = 0x0;
    rULCON2 = 0x3;
    rUCON2  = 0x245;
	rUBRDIV2 = ((int)(GetMasterClock()/16./baud + 0.5) -1);
   
    while(1)
    {
   		m = getkey();
		if(m==ESC_KEY)
			break;
		//while(1) {
		//m = 'a';
		if(m) {
			En485Tx();
			while(!(rUTRSTAT2 & 0x4)); //Wait until THR is empty.
			WrUTXH2(m);
			while(!(rUTRSTAT2 & 0x4)); //Wait until THR is empty.
			En485Rx();
		}
		//}
		if((rUTRSTAT2 & 0x1)) //Receive data ready
			putch(RdURXH2());
		//while(!(rUTRSTAT2 & 0x4)); //Wait until THR is empty.
		//WrUTXH2(0xaa);
		//Delay(2);
    }
    
    reset_io();

}

static char title[] = "485串口通讯实验";
static char tip[]   = "实验串口3(UART2)的485通讯功能,按ESC键返回";

//Test_Uart2_485_Item在prog_entry.c里被引用
TEST_PROGRAM_ITEM Test_Uart2_485_Item = {
				(TEST_PROGRAM)Test_Uart2_485, 	//入口地址
				title, 					//显示名称
				tip, 					//帮助或提示信息,可为NULL
				1};						//使用printf,puts,putch等函数时在LCD上也显示输出字符(串)