st16c55x.c

MSP430接ST16C55X的串口扩展卡程序

#include<msp430x13x.h>
#include"st16c55x.h"
extern void wait_ms(unsigned char i);

unsigned char com1_data[38];
unsigned char com1_i;
unsigned char com2_data[38];
unsigned char com2_i;
unsigned char com3_data[38];
unsigned char com3_i;
unsigned char com4_data[38];
unsigned char com4_i;


void st16c55x_res()
{
	DATA_DIR_OUT;
	RW_DIR_OUT; 
	A0_DIR_OUT;
	A1_DIR_OUT;
	A2_DIR_OUT;
	A3_DIR_OUT;
	A4_DIR_OUT;
	CS_DIR_OUT;
	IRQ_DIR_IN;
	//RXRDY_DIR_IN;
	//TXRDY_DIR_IN;
	CS_H;
}	

void write_byte(unsigned char dat)
{
	DATA_DIR_OUT;
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	DATA_OUT=dat;
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	RW_W;
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	CS_L;
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	CS_H;
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	RW_R;
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	_NOP();
}

unsigned char read_byte()
{
	unsigned char i;
	DATA_DIR_IN;
	_NOP();
	_NOP();
	_NOP();
	RW_R;
	_NOP();
	_NOP();
	_NOP();
	CS_L;
	_NOP();
	_NOP();
	_NOP();
	_NOP();
	i=DATA_IN;
	_NOP();
	_NOP();
	CS_H;
	_NOP();
	_NOP();
	_NOP();
	RW_R;
	_NOP();
	_NOP();
	_NOP();
	DATA_DIR_OUT;
	return(i);
}		

/*---------------------------------------------------        
                         串口选择
                  入口:串口编号,波特率     
         数据格式默认为 8位数据位，1位停止位，无校验
-----------------------------------------------------*/

void chioce_com(unsigned char port,unsigned long i)
{
	switch(port)
	{
		case 1:CH_COM1;
		       break;
		case 2:CH_COM2;
		       break;
		case 3:CH_COM3;
		       break;
		case 4:CH_COM4;
		       break;                     
	}
	
	LCR;
	write_byte(0x00);
	IER;
	write_byte(0x00); 
	
	LCR;
	write_byte(0x80);
	
	switch(i)
	{
		case    300: DLM;
		             write_byte(baud_rate[0][1]);
		             DLL;
		             write_byte(baud_rate[0][0]);
		             break;  
	       
	        case   1200: DLM;
		             write_byte(baud_rate[1][1]);
		             DLL;
		             write_byte(baud_rate[1][0]);
		             break;
		
		case   2400: DLM;
		             write_byte(baud_rate[2][1]);
		             DLL;
		             write_byte(baud_rate[2][0]);
		             break;            
		
		case   9600: DLM;
		             write_byte(baud_rate[3][1]);
		             DLL;
		             write_byte(baud_rate[3][0]);
		             break;
		
		case  19200: DLM;
		             write_byte(baud_rate[4][1]);
		             DLL;
		             write_byte(baud_rate[4][0]);
		             break;
		
		case  38400: DLM;
		             write_byte(baud_rate[5][1]);
		             DLL;
		             write_byte(baud_rate[5][0]);
		             break;
		
		case  56000: DLM;
		             write_byte(baud_rate[6][1]);
		             DLL;
		             write_byte(baud_rate[6][0]);
		             break;
		
		case 115000: DLM;
		             write_byte(baud_rate[7][1]);
		             DLL;
		             write_byte(baud_rate[7][0]);
		             break;
		                                                                
	}
	
	
	LCR; 
	write_byte(0x03); //8位数据位，1个停止位，无校验
	FCR;
	write_byte(0x07); //使能FIFO，复位发送和接收
	IER;
	write_byte(0x01); //使能接收，发送中断		
}	

/*------------------------------------------------
                 数据发送函数
            入口：数据首地址 数据长度
-------------------------------------------------*/                 
void st16c55x_send(unsigned char *p,unsigned char l,unsigned char port)
{
	unsigned char i;
	switch(port)
	{
		case 1:CH_COM1;
		       break;
		case 2:CH_COM2;
		       break;
		case 3:CH_COM3;
		       break;
		case 4:CH_COM4;
		       break;                     
	}
	THR;
	for(i=0;i<l;i++)
	{
		write_byte(*p++);  
		   
		while((P3IN&0x02)!=0);
	}	
}	





/*----------------------------------------------------------
              外部中断初始化函数                 
-----------------------------------------------------------*/

void P1_Init(void)
{
	P1DIR &= 0x7F;
        P1IES |= 0x80;
        P1IE  |= 0x80; 
        P1IFG=0;
}


/*--------------------------------------------------------------------------
                         st16c55x中断服务程序                                 
---------------------------------------------------------------------------*/
#pragma vector = PORT1_VECTOR
__interrupt void P1_Isr (void)
{
	unsigned char i;
	if((P1IFG & 0x80) == 0x80)
        {
        	CH_COM1;
        	LSR;
        	i=read_byte();
        	if((i&0x01)!=0)
        	{
        		RHR;
        	        com1_data[com1_i++]=read_byte();
        	}
        	
        	CH_COM2;
        	LSR;
        	i=read_byte();
        	if((i&0x01)!=0)
        	{
        		RHR;
        	        com2_data[com2_i++]=read_byte();
        	}
        	
        	CH_COM3;
        	LSR;
        	i=read_byte();
        	if((i&0x01)!=0)
        	{
        		RHR;
        	        com3_data[com3_i++]=read_byte();
        	}
        	
        	CH_COM4;
        	LSR;
        	i=read_byte();
        	if((i&0x01)!=0)
        	{
        		RHR;
        	        com4_data[com4_i++]=read_byte();
        	}
        }    
        P1IFG=0;
}