//[PWM.c]脈寬調(diào)制----------------------------------------------------------*
//本文件包含:                                                              *
//    (1)PWMInit:PWM初始化                                                 *
//    (2)PWMSetting:設(shè)置PWM周期和占空比設(shè)置                                *
//-------------------------------------------------------------------------*

//頭文件
#include "PWM.h"    //脈寬調(diào)制頭文件

//PWMInit:PWM初始化--------------------------------------------------------*
//功  能:PWM初始化,A,B時(shí)鐘頻率均設(shè)為8MHz                                   *
//參  數(shù):                                                                  *
//    channel-通道號(hào),polarity-極性,align-對(duì)齊方式,                         *
//    polarity:0-負(fù)極性,1-正極性,align:0-左對(duì)齊,1-中心對(duì)齊                 *
//返  回:無                                                                *
//-------------------------------------------------------------------------*
void PWMInit(INT8U channel,INT8U polarity,INT8U align)
{
    INT8U i,j;
    //1 禁止通道channel
    j = 0x01;     
    for (i=0; i<channel; i++)    //禁止通道channel
        j = j<<1;
    PWME &= ~j; 
    //2 PWM時(shí)鐘源選擇,選擇X時(shí)鐘作為channel的時(shí)鐘源
    j = 0x01;
    for (i=0; i<channel; i++)
        j = j<<1;
    PWMCLK &= ~j;   
    //3 設(shè)置A,B的時(shí)鐘頻率
    switch (channel)
    {
    //通道0,1,4,5使用A時(shí)鐘,A時(shí)鐘頻率=19.6608MHz/128
    case 0:
    case 1:
    case 4:
    case 5:
        PWMPRCLK |= 0x07;
        break;
    //通道2,3,6,7使用B時(shí)鐘,B時(shí)鐘頻率=19.6608MHz/128
    case 2:
    case 3:
    case 6:
    case 7:
        PWMPRCLK |= 0x70;
        break;
    default:
        break;
    }     
    //4 確定channel輸出極性
    j = 0x01;
    if (polarity == 1)            //正極性
    {
        for (i=0; i<channel; i++)
            j = j<<1;
        PWMPOL |= j;
    }
    else
    {                             //負(fù)極性
        for (i=0; i<channel; i++) 
            j = j<<1;     
        PWMPOL &= ~j;
    }
    //5 確定channel輸出方式
    j = 0x01;
    if (align == 0)               //左對(duì)齊
    {
        for (i=0; i<channel; i++)
            j = j<<1;
        PWMCAE &= ~j;
    }
    else                          //中心對(duì)齊
    {
        for (i=0; i<channel; i++)
            j = j<<1;
        PWMCAE |= j;
    }
    //6 清0通道channel計(jì)數(shù)器
    PWMCNT0 = 0;   
}

//PWMSetting:PWM周期和占空比設(shè)置-------------------------------------------*
//功  能:根據(jù)參數(shù)設(shè)置f周期和占空比                                         *
//參  數(shù):                                                                  *
//    period=PWM周期所占用的時(shí)鐘周期個(gè)數(shù)                                   *
//    duty=PWM占空比所占用的時(shí)鐘周期個(gè)數(shù)                                   *
//    Channel=所要設(shè)置的通道號(hào)(0~7)                                        *
//返  回:無                                                                *
//說  明:duty的值<=period的值,并且兩者的值都在0～255之間                   *
//-------------------------------------------------------------------------*
void PWMSetting(INT8U channel,INT8U period,INT8U duty)
{
    switch(channel)
    {
    case 0:
        PWMCNT0 = 0x00;      //清通道0計(jì)數(shù)器
        PWMDTY0 = duty;      //設(shè)置周期寄存器
        PWMPER0 = period;    //設(shè)置占空比寄存器
        break;
    case 1:
        PWMCNT1 = 0x00;      //清通道1計(jì)數(shù)器
        PWMDTY1 = duty;      //設(shè)置周期寄存器
        PWMPER1 = period;    //設(shè)置占空比寄存器
        break;
    case 2:
        PWMCNT2 = 0x00;      //清通道2計(jì)數(shù)器
        PWMDTY2 = duty;      //設(shè)置周期寄存器
        PWMPER2 = period;    //設(shè)置占空比寄存器
        break;
    case 3:
        PWMCNT3 = 0x00;      //清通道3計(jì)數(shù)器
        PWMDTY3 = duty;      //設(shè)置周期寄存器
        PWMPER3 = period;    //設(shè)置占空比寄存器
        break;
    case 6:
        PWMCNT6 = 0x00;      //清通道6計(jì)數(shù)器
        PWMDTY6 = duty;      //設(shè)置周期寄存器
        PWMPER6 = period;    //設(shè)置占空比寄存器
        break;
    case 7:
        PWMCNT7 = 0x00;      //清通道7計(jì)數(shù)器
        PWMDTY7 = duty;      //設(shè)置周期寄存器
        PWMPER7 = period;    //設(shè)置占空比寄存器
        break;
    default:
        break;
    }
}