RS485接收数据并显示在lcd1602上的c语言代码

以下是一个简单的示例代码，可以通过RS485接收数据并在LCD1602上显示：

#include <reg52.h>
#include <stdio.h>
#include <string.h>

sbit RS485EN = P1^0;
sbit RS485RW = P1^1;

sbit LCD_RS = P2^0;
sbit LCD_RW = P2^1;
sbit LCD_EN = P2^2;

unsigned char g_uart_buf[256]={0};
unsigned char g_uart_cnt=0;

void InitUART(void);
void InitLCD(void);
void LCD1602_WriteCmd(unsigned char cmd);
void LCD1602_WriteData(unsigned char dat);
void LCD1602_WriteString(unsigned char x, unsigned char y, unsigned char *s);
void RS485_Send(unsigned char *buf, unsigned char len);
void RS485_Recv(unsigned char *buf);

void main()
{
    unsigned char buf[256]={0};
    unsigned char len=0;
    unsigned char i=0;

    InitUART();
    InitLCD();

    while(1)
    {
        RS485_Recv(buf);
        len=strlen(buf);
        LCD1602_WriteString(0, 0, "Recv:");
        for(i=0;i<len;i++)
        {
            LCD1602_WriteData(buf[i]);
        }
    }
}

void InitUART(void)
{
    TMOD |= 0x20; //设置定时器1为模式2
    TH1 = 0xfd; //设定波特率为9600bps
    TL1 = 0xfd;
    SCON = 0x50; //设置串口为模式1，允许接收中断
    ES = 1; //允许串口中断
    TR1 = 1; //启动定时器1
}

void InitLCD(void)
{
    LCD1602_WriteCmd(0x38); //设置16*2显示，5*7点阵，8位数据总线
    LCD1602_WriteCmd(0x0c); //开显示，关光标，不闪烁
    LCD1602_WriteCmd(0x06); //文字不动，光标自动右移
    LCD1602_WriteCmd(0x01); //清屏
}

void LCD1602_WriteCmd(unsigned char cmd)
{
    RS485EN = 0;
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_EN = 0;
    LCD_EN = 1;
    LCD_EN = 0;
    P0 = cmd;
    delay_ms(1);
}

void LCD1602_WriteData(unsigned char dat)
{
    RS485EN = 0;
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_EN = 0;
    LCD_EN = 1;
    LCD_EN = 0;
    P0 = dat;
    delay_ms(1);
}

void LCD1602_WriteString(unsigned char x, unsigned char y, unsigned char *s)
{
    unsigned char addr=0;

    if(x==0) addr=0x80+y; //第一行
    else addr=0xc0+y; //第二行

    LCD1602_WriteCmd(addr);
    while(*s)
    {
        LCD1602_WriteData(*s++);
    }
}

void RS485_Send(unsigned char *buf, unsigned char len)
{
    unsigned char i=0;

    RS485EN = 1;
    RS485RW = 0;
    for(i=0;i<len;i++)
    {
        SBUF = buf[i];
        while(!TI);
        TI = 0;
    }
    RS485EN = 0;
}

void RS485_Recv(unsigned char *buf)
{
    while(RI==0);
    RI = 0;
    buf[g_uart_cnt++]=SBUF;
    if(g_uart_cnt>=255) g_uart_cnt=0;
}

以上代码中，使用了RS485EN和RS485RW两个控制引脚来控制RS485芯片的发送和接收模式。在主函数中，不断调用RS485_Recv函数来接收数据，然后将数据显示在LCD1602上。

需要注意的是，以上代码仅供参考，具体的实现方式可能因为硬件和软件环境的不同而有所差异。