lcd1602.c

C51操作5767收音机芯片(内置杭州的几个台)

#include "LCD1602.h"


#define BUSYFLAG 0x80 //用于检测LCM状态字中的Busy标识



static void short_delay(unsigned int i)
{
	while (i>0) i--;
}


void ReadBusyLCM(void)
{       // 测试LCD忙碌状态 直到忙碌状态结束
	bit result;
	LCM_Data |= BUSYFLAG; //D7(BF) 1-正在执行内部操作 0-可接收指令
	do
	{
		LCM_RS = 0;
		LCM_RW = 1;
		LCM_E = 1;
		result = (bit)(LCM_Data & 0x80);////
		LCM_E = 0;
	}while (result == 1);
}


//写数据
void WriteDataLCM(unsigned char WDLCM)
{
	ReadBusyLCM(); //检测忙
	LCM_Data = WDLCM;
	LCM_RS = 1;
	LCM_RW = 0;
	LCM_E = 1;
	LCM_E = 0; //若晶振速度太高可以在这后加小的延时
	short_delay(250);
//	short_delay(250);
}


//写指令
void WriteCommandLCM(unsigned char WCLCM,unsigned char BusyC) //BusyC为0时忽略忙检测
{
	if (BusyC) ReadBusyLCM(); //根据需要检测忙
	LCM_Data = WCLCM;
	LCM_RS = 0;
	LCM_RW = 0; 
	LCM_E = 1; 
	LCM_E = 0;
	short_delay(250);
}


void LCMInit(void) //LCM初始化
{
	LCM_E = 0;
	WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
	short_delay(250);
	WriteCommandLCM(0x38,0);
	short_delay(250);
	WriteCommandLCM(0x38,0);
	WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
	WriteCommandLCM(0x08,1); //关闭显示
	WriteCommandLCM(0x01,1); //显示清屏
	WriteCommandLCM(0x06,1); // 显示光标移动设置
	WriteCommandLCM(0x0C,1); // 显示开及光标设置
	short_delay(250);
}


//按指定位置显示一个字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
	Y &= 0x1;
	X &= 0xF; //限制X不能大于15，Y不能大于1
	if (Y) X |= 0x40; //当要显示第二行时地址码 0x40;
	X |= 0x80; // 算出指令码
	WriteCommandLCM(X, 1); //这里不检测忙信号，发送地址码
	WriteDataLCM(DData);
}


//按指定位置显示一串字符
void DisplayListChar_code(unsigned char X, unsigned char Y, unsigned char code *DData)
{
	DisplayOneChar(X,Y,*DData);
	while((*(++DData))>0x20 && ++X<=0xf)
	{
		WriteDataLCM(*DData);
	}
}

void DisplayListChar(unsigned char X, unsigned char Y, unsigned char  *DData)
{
	DisplayOneChar(X,Y,*DData);
	while((*(++DData))>0x20 && ++X<=0xf)
	{
		WriteDataLCM(*DData);
	}
}


#ifdef ReadDataLCM_ENABLE
	//读数据
	unsigned char ReadDataLCM(void)
	{
		LCM_RS = 1; 
		LCM_RW = 1;
		LCM_E = 1;
		LCM_E = 0;
		short_delay(250);
		return(LCM_Data);
	}
#endif