基于C8051F330的PWM设置程序

/************************************************************************************ * Copyright (c), 2006-2007, C8051F网络 * All rights reserved. * * Http: www.c8051f.com * Email: mite@vip.qq.com * * File name: keyled.c * Project : C8051F330ST * Processor: C8051F330 * Compiler : Keil C51 Compiler * * author: glacier * QQ: 252858144 * date: 2009.02.12 * * Description: 本文件是键盘读取及LED显示驱动程序文件; * * Others: none; * * Function List: * 1. void Keyled_Init(void) * 2. unsigned char Key_Read(void) * *************************************************************************************/ /********************************引用外部头文件*************************************/ #include <INTRINS.H> #include "..\source\c8051f330.h" #include "..\source\keyled.h" /*********************************常量及全局变量声明********************************/ //位操作设置 sbit MISO = P0^3; //模拟SPI方式 sbit MOSI = P0^6; sbit SCK = P0^2; sbit nLD = P1^6; /*0-F数码管显示数组*/ unsigned char code LED_Tab[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f, 0x77,0x7c,0x39,0x5e,0x79,0x71}; unsigned char xdata Led_Buf[8]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07}; unsigned char xdata Led_ID = 0; //按键检测 unsigned char Key0,Key1; unsigned char Key_Value; bit bKeyDown; /*************************************************************************************/ // // 键盘读取及LED显示硬件驱动程序函数定义 // Note: 需要占用定时器0; // /*************************************************************************************/ /*********************************************************************************** * Function: Keyled_Init; * * Description: 为Spi方式LED显示及按键检测设置的定时0初使化; * * Input: none; * * Output: none; * * Return: none; * * Note: none; ************************************************************************************/ void Keyled_Init(void) { #define TIME 2 //2ms //中断设置 ET0=1; //定时器T0中断允许 PT0=0; //定时器T0中断优先级为低 //时钟设置 CKCON |= 0x02;//系统时钟的48分频为T0时钟 CKCON &= 0xfe; TMOD &= 0xf0;//设置当TR1=1时开启T0，T0为13位计时器方式 TH0 = 0x00; //清T0初值 TL0 = 0x00; bKeyDown = 0; //清按键检测 Key_Value = 0xff; Key0 = 0; Key1 = 0; TR0 = 1; //使能T0 } /*********************************************************************************** * Function: SPI_PutVal; * * Description: 通过SPI总线协议发送和接收数据; * * Input: val,通过SPI总线协议发送的数据; * * Output: none; * * Return: 通过SPI总线协议接收的数据; * * Note: none; ************************************************************************************/ unsigned char SPI_PutVal(unsigned char val) { unsigned char count; // SPI位计数值 for (count = 8; count > 0; count--) // 单字节位移 { MOSI = val & 0x80; // 将字节最高为送MOSI val = val << 1; // 字节向左移一位 SCK = 0x00; // SCK拉低 val |= MISO; // 将MISO值付val SCK = 0x01; // SCK拉高 } return (val); //将MISO采到的单字节送出 } /*********************************************************************************** * Function: Key_Read; * * Description: 读取按键键值函数; * * Input: none; * * Output: none; * * Return: 返回按键键值, 键值范围是0x01~0x08; 如果返回0xff, 表示无按键按下; * * Note: none; ************************************************************************************/ unsigned char Key_Read(void) { unsigned char val; val = Key_Value; //取键值 Key_Value = 0xff; //复位Key_Value return val; //送出键值 } /*********************************************************************************** * Function: LED_Display; * * Description: 读取按键键值函数; * * Input: none; * * Output: none; * * Return: 返回按键键值, 键值范围是0x01~0x08; 如果返回0xff, 表示无按键按下; * * Note: none; ************************************************************************************/ /* void LED_Display(unsigned char *p,unsigned char len) { unsigned char val; val = Key_Value; Key_Value = 0xff; return val; } */ /*********************************************************************************** * Function: Timer0_ISR; * * Description: 为Spi方式LED显示及按键检测服务的定时0中断函数; * * Input: none; * * Return: none; * * Note: none; ************************************************************************************/ void Timer0_ISR(void) interrupt 1 using 3 //T0中断函数 { TR0 = 0; //关闭T0 TH0 = 0xe0; //付T0初值 TL0 = 0x03; //开启T0 TR0 = 1; nLD = 0; // 锁定并行数据 _nop_(); nLD = 1; Key0 = SPI_PutVal(Led_Buf[Led_ID]); //取键值并显示字型 SPI_PutVal(0x80>>Led_ID); //送位选信号 Led_ID++; //位计数++ if (Led_ID>7) //如果位计数超限 { Led_ID = 0; //位计数清零 if (Key0!=0xff) //如果有键按下 { if ((Key0==Key1)&&(!bKeyDown)) //去抖动，按键读取完成位不为1 { bKeyDown = 1; //按键读取完成位为1 switch (Key0) //判断按键值 { case 0xfe: Key_Value = 1;break; case 0xfd: Key_Value = 2;break; case 0xfb: Key_Value = 3;break; case 0xf7: Key_Value = 4;break; case 0xef: Key_Value = 5;break; case 0xdf: Key_Value = 6;break; case 0xbf: Key_Value = 7;break; case 0x7f: Key_Value = 8;break; default: Key_Value = 0xff; bKeyDown = 0;break; } } else Key1 = Key0; } else { if (Key0==Key1) bKeyDown = 0; else Key1 = Key0; } } } /************************************************************************************ * 文件结束 ************************************************************************************/