ZLG7289程序

//以下为键盘使用的全局变量声名#define KEY_BUFFER_SIZE 30 //键盘缓存大小，如果缓存的按键数量大于缓存容量，则最早按下的按键丢弃#define KEY_CANCEL 0x11#define KEY_UP 0x12#define KEY_CONFIRM 0x10#define KEY_LEFT 0x14#define KEY_DOWN 0x13#define KEY_RIGHT 0x15//--定义键盘缓存：缓存为循环链表unsigned char key_buffer[KEY_BUFFER_SIZE]; //键盘缓存int key_buffer_pointer; //键盘缓存首指针(指向最后一个被按下的按键)int key_buffer_amount; //键盘缓存键值数()//int key_current_key;//--定义结束//--定义ZLG7289与MCU的硬件连接sbit ZLG7289_pinCS = P0^3;sbit ZLG7289_pinCLK = P0^2;sbit ZLG7289_pinDIO = P0^1;unsigned char ZLG7289_Delay_t;//--定义结束//键盘使用的全局变量定义结束/*宏定义：ZLG7289_ShortDelay()功能：短延时说明：延时(ZLG7289_Delay_t*2+2)个机器周期*/void ZLG7289_ShortDelay(){unsigned char t = ZLG7289_Delay_t;while ( --t != 0 );}/*宏定义：ZLG7289_LongDelay()功能：长延时说明：延时(ZLG7289_Delay_t*12+8)个机器周期*/void ZLG7289_LongDelay(){unsigned char t = ZLG7289_Delay_t * 6;while ( --t != 0 );}/*函数：ZLG7289_SPI_Write()功能：向SPI 总线写入1 个字节的数据参数：dat：要写入的数据*/void ZLG7289_SPI_Write(char dat)// reentrant{unsigned char t = 8;do{ZLG7289_pinDIO = (bit)(dat & 0x80);dat <<= 1;ZLG7289_pinCLK = 1;ZLG7289_ShortDelay();ZLG7289_pinCLK = 0;ZLG7289_ShortDelay();} while ( --t != 0 );}/*函数：ZLG7289_SPI_Read()功能：从SPI 总线读取1 个字节的数据返回：读取到的数据*/char ZLG7289_SPI_Read()// reentrant{char dat;unsigned char t = 8;ZLG7289_pinDIO = 1; //读取数据之前DIO 引脚要置1 以切换到输入状态do{ZLG7289_pinCLK = 1;ZLG7289_ShortDelay();dat <<= 1;if ( ZLG7289_pinDIO ) dat++;ZLG7289_pinCLK = 0;ZLG7289_ShortDelay();} while ( --t != 0 );return dat;}/*功能：执行ZLG7289 键盘命令返回：返回读到的按键值：0～63如果返回0xFF 则表示没有键按下*/char ZLG7289_Key() //reentrant{char key;ZLG7289_pinCS = 0;ZLG7289_LongDelay();ZLG7289_SPI_Write(0x15);ZLG7289_LongDelay();key = ZLG7289_SPI_Read();ZLG7289_pinCS = 1;ZLG7289_LongDelay();return key;}void ZLG7289_Reset(){EX0=0;key_buffer_pointer=-1;key_buffer_amount=0;ZLG7289_pinCS = 0;ZLG7289_LongDelay();ZLG7289_SPI_Write(0xA4);ZLG7289_pinCS = 1;EX0=1;ZLG7289_LongDelay();}/*函数：ZLG7289_Init()功能：ZLG7289 初始化参数：t：SPI 总线的延时值设置，取值1-40（超出范围可能导致错误）说明：t的取值可以参照以下公式：t >= 5 * f1 / f2，其中f1 表示80C51 的晶振频率，f2 表示ZLG7289 的晶振频率*/void ZLG7289_Init(){//unsigned char x;//I/O 口初始化ZLG7289_pinCS = 1;ZLG7289_pinCLK = 0;ZLG7289_pinDIO = 1;//ZLG7289_pinINT = 1;EA=0;IT0 = 1; //负边沿触发中断EX0 = 1; //允许外部中断EA=1;//延时初始化ZLG7289_Delay_t = 30;ZLG7289_Reset();}void ZLG7289_read() interrupt 0 using 1// 读键盘函数，响应外部中断0 {unsigned char t,t1;unsigned char dat;EX0=0;//此处处理键盘缓存，取回的键值已放在了temp变量中key_buffer_pointer++;key_buffer_pointer=key_buffer_pointer%KEY_BUFFER_SIZE;ZLG7289_pinCS = 0;t = ZLG7289_Delay_t * 6;while ( --t != 0 );t=8;dat=0x15;do{ZLG7289_pinDIO = (bit)(dat & 0x80);dat <<= 1;ZLG7289_pinCLK = 1;t1 = ZLG7289_Delay_t;while ( --t1 != 0 );ZLG7289_pinCLK = 0;t1 = ZLG7289_Delay_t;while ( --t1 != 0 );}while ( --t != 0 );t = ZLG7289_Delay_t * 6;while ( --t != 0 );t=8;dat=0;ZLG7289_pinDIO = 1; //读取数据之前DIO 引脚要置1 以切换到输入状态do{ZLG7289_pinCLK = 1;t1 = ZLG7289_Delay_t;while ( --t1 != 0 );dat <<= 1;if ( ZLG7289_pinDIO ) dat++;ZLG7289_pinCLK = 0;t1 = ZLG7289_Delay_t;while ( --t1 != 0 );} while ( --t != 0 );key_buffer[key_buffer_pointer] = dat;ZLG7289_pinCS = 1;t = ZLG7289_Delay_t * 6;while ( --t != 0 );key_buffer_amount++;EX0=1;}unsigned char GetKey() //用户函数，得到最先被按下且尚未被处理的按键。

若未有按键则返回-1{unsigned char temp;if(key_buffer_amount){EX0=0;if(key_buffer_amount>KEY_BUFFER_SIZE)key_buffer_amount=KEY_BUFFER_SIZE;temp=key_buffer[(key_buffer_pointer-key_buffer_amount+1)%KEY_BUFFER_SIZE];key_buffer_amount--;EX0=1;return temp;}return 0xFF;}unsigned char GetLastKey() //用户函数，得到最后被按下的按键，尚未处理的按键全部丢弃；若无键按下，返回-1。

{unsigned char temp;if(key_buffer_amount){EX0=0;temp=key_buffer[key_buffer_pointer];key_buffer_pointer=-1;key_buffer_amount=0;EX0=1;return temp;}return -1;}unsigned char GetCurrentKey() //用户函数，等待用户按键，并得到键值，尚未处理的按键全部丢弃{unsigned char temp;EX0=0;key_buffer_pointer=-1;key_buffer_amount=0;EX0=1;ZLG7289_Reset();while(!key_buffer_amount);EX0=0;key_buffer_pointer=-1;key_buffer_amount=0;temp=key_buffer[0];EX0=1;return temp;}。