超声波测距系统 - 图文(12)

LCM_E = 0; //若晶振速度太高可以在这后加小的延时 LCM_E = 0; //延时 LCM_E = 1; }

//写指令

void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测 {

if (BuysC) ReadStatusLCM(); //根据需要检测忙 LCM_Data = WCLCM; LCM_RS = 0; LCM_RW = 0; LCM_E = 0; LCM_E = 0; LCM_E = 1; }

//读数据

unsigned char ReadDataLCM(void) {

LCM_RS = 1; LCM_RW = 1; LCM_E = 0; LCM_E = 0; LCM_E = 1;

return(LCM_Data);

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}

//读状态

unsigned char ReadStatusLCM(void) {

LCM_Data = 0xFF; LCM_RS = 0; LCM_RW = 1; LCM_E = 0; LCM_E = 0; LCM_E = 1;

while (LCM_Data & Busy); //检测忙信号 return(LCM_Data); }

void LCMInit(void) //LCM初始化 {

LCM_Data = 0;

WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号 Delay5Ms();

WriteCommandLCM(0x38,0); Delay5Ms();

WriteCommandLCM(0x38,0); Delay5Ms();

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 }

//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); //发命令字 WriteDataLCM(DData); //发数据 }

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