rs232andlcd1602.txt

msp430f2274的异步串口通信与lcd1602显示

#include <intrinsics.h> 
#include "msp430x22x4.h"
void delay(void);
void init(void) ;
unsigned char j=0;
unsigned char k=0;
//unsigned char p[15];
////管脚定义////////////////////////////////////////////////////////////////////
#define LCD_EN_PORT P3OUT //以下2个要设为同一个口 
#define LCD_EN_DDR P3DIR 
#define LCD_RS_PORT P3OUT //以下2个要设为同一个口 
#define LCD_RS_DDR P3DIR 
#define LCD_DATA_PORT P4OUT //以下3个要设为同一个口 
#define LCD_DATA_DDR P4DIR //一定要用高4位 
#define LCD_RS BIT0
#define LCD_EN BIT1
#define LCD_DATA BIT4|BIT5|BIT6|BIT7
////预定义函数//////////////////////////////////////////////////////////////////
void LCD_init(void); 
void LCD_en_write(void); 
void LCD_write_command(unsigned char command);
void LCD_write_data(unsigned char data); 
void LCD_set_xy (unsigned char x, unsigned char y); 
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s); 
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data); 
void delay_nus(unsigned int n); 
void delay_nms(unsigned int n); 
 
void main(void)
{ // unsigned char *q=p;
   WDTCTL=WDTPW + WDTHOLD;
  LCD_init(); 
  init();
  //LCD_write_string(1,0,q); 
}
void init(void)
{
  UCA0CTL1=UCSSEL0;    //时钟源选择32768
  UCA0BR0=27; 
  UCA0BR1=0;
  UCA0MCTL=UCBRS1;
  UCA0CTL1 &=~UCSWRST;     //USART控制寄存器SWRST=0x01，~SWRST=0xFE,将UCTL0寄存器的第0位  
  P3SEL=BIT4+BIT5;
  P3DIR |=BIT4;             //p3.4为输出方向
  IE2 |=UCA0RXIE;
  for(;;)
  {
  _BIS_SR(LPM3_bits+GIE);
 while(UCA0TXIFG&IFG2);
  delay();
  }
}

//LCD液晶操作函数///////////////////////////////////////////////////////////////
//LCD1602液晶初始化 
void LCD_init(void) 
{ 
LCD_DATA_DDR|=LCD_DATA; //数据口方向为输出
LCD_EN_DDR|=LCD_EN; //设置EN方向为输出
LCD_RS_DDR|=LCD_RS; //设置RS方向为输出

LCD_write_command(0x28); //4位数据接口
delay_nus(40); 
LCD_write_command(0x28); //4位显示
LCD_write_command(0x0c); //显示开
LCD_write_command(0x01); //清屏
delay_nms(2); 
} 
//液晶使能 
void LCD_en_write(void) 
{ 
LCD_EN_PORT|=LCD_EN; 
delay_nus(1); 
LCD_EN_PORT&=~LCD_EN; 
} 
//写指令 
void LCD_write_command(unsigned char command) 
{ 
delay_nus(16); 
LCD_RS_PORT&=~LCD_RS; //RS=0 
LCD_DATA_PORT&=0X0f; //清高四位 
LCD_DATA_PORT|=command&0xf0; //写高四位 
LCD_en_write(); 
command=command<<4; //低四位移到高四位 
LCD_DATA_PORT&=0x0f; //清高四位 
LCD_DATA_PORT|=command&0xf0; //写低四位 
LCD_en_write(); 
}
 //写数据 
void LCD_write_data(unsigned char data) 
{ 
delay_nus(16); 
LCD_RS_PORT|=LCD_RS; //RS=1 
LCD_DATA_PORT&=0X0f; //清高四位 
LCD_DATA_PORT|=data&0xf0; //写高四位 
LCD_en_write(); 
data=data<<4; //低四位移到高四位 
LCD_DATA_PORT&=0X0f; //清高四位 
LCD_DATA_PORT|=data&0xf0; //写低四位 
LCD_en_write(); 
} 
//写地址函数 
void LCD_set_xy( unsigned char x, unsigned char y ) 
{ 
unsigned char address; 
if (y == 0) address = 0x80 + x; 
else address = 0xc0 + x; 
LCD_write_command( address); 
} 
//LCD在任意位置写字符串
//列x=0~15,行y=0,1 
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) 
{ 
LCD_set_xy( X, Y ); //写地址 
while (*s) // 写显示字符 
{ 
LCD_write_data( *s ); 
s ++; 
}
}
//LCD在任意位置写字符
//列x=0~15,行y=0,1 
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data) 
{ 
LCD_set_xy( X, Y ); //写地址 
LCD_write_data( data); 
} 
//延时函数//////////////////////////////////////////////////////////////////////
//1us延时函数
void delay_1us(void) 
{
asm("nop");
}
//N us延时函数
void delay_nus(unsigned int n) 
{
unsigned int i;
for (i=0;i<n;i++)
delay_1us();
}
//1ms延时函数
void delay_1ms(void) 
{
unsigned int i;
for (i=0;i<1140;i++);
}
//N ms延时函数
void delay_nms(unsigned int n) 
{
unsigned int i=0;
for (i=0;i<n;i++)
delay_1ms();
}
#pragma vector =USCIAB0RX_VECTOR
__interrupt void rx_isr(void)
{
unsigned char x;
   UCA0TXBUF=UCA0RXBUF;  
   //p[i]=UCA0RXBUF
    x=UCA0RXBUF;
   
   if(j==16&&k==0)
   {
      j=0;
      k=1;
    }
   if(k==1&&j==16)
   {
     LCD_write_command(0x01); //清屏;
     delay_nms(1);
     k=0;
     j=0;
   } 
   
   LCD_write_char(j,k,x);
   j++;
    _BIC_SR_IRQ(LPM3_bits);

}

void delay(void)
{
  unsigned int i=180;
  while(i!=0)
  i--;

}