pwm.c

来自「基于LPC2136的线阵CCD采集系统的源代码」· C语言 代码 · 共 45 行

/****************************************Copyright (c)**************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			main.c
** Last modified Date:  2004-09-16
** Last Version:		1.0
** Descriptions:		The main() function example template
**
**------------------------------------------------------------------------------------------------------
** Created by:			Chenmingji
** Created date:		2004-09-16
** Version:				1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by: 		linwensen
** Modified date:		2007-09-25
** Version:				1.01
** Descriptions:		外部中断唤醒掉电CPU，同时产生中断。
**
********************************************************************************************************/
#include "config.h"

void pwminit (void)
{
    PINSEL0  = 0x02 << 14;		// P0.7选择PWM2功能
    
    /* PWM初始化 */
    PWMPR    = 0x00;		    // 不分频，计数频率为Fpclk
    PWMMCR   = 0x02;			// 设置PWMMR0匹配时复位PWMTC
    PWMPCR   = 0x0400;			// 允许PWM2输出，单边PWM
    PWMMR0   = Fpclk / 1000;
    PWMMR2   = PWMMR0 / 2;		// 50%占空比
    PWMLER   = 0x05;			// PWM0和PWM2匹配锁存
    PWMTCR   = 0x02;            // 复位PWMTC
    PWMTCR   = 0x09;            // 启动PWM输出
	
}
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/