/*********************************************************************************
 *      Copyright:  (C) 2021 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  pwm.h
 *    Description:  This file is used to control PWM buzzer/Led
 *
 * Pin connection:
 *               PWM Module              Raspberry Pi Board
 *                  VCC       <----->      5V
 *                 buzzer     <----->      #Pin32(BCM GPIO12)
 *                  Led       <----->      #Pin33(BCM GPIO13)
 *                  GND       <----->      GND
 *
 * /boot/config.txt:
 *
 *          dtoverlay=pwm,pin=12,func=4 (Buzzer)
 *          dtoverlay=pwm,pin=13,func=4 (Led)
 *
 ********************************************************************************/


#ifndef  _PWM_H_
#define  _PWM_H_

#define PWMCHIP_PATH      "/sys/class/pwm/pwmchip0"

#define ENABLE            1
#define DISABLE           0

#define CHN_BEEPER        0
#define FRQ_BEEPER        2700

#define CHN_RGBLED        1
#define FRQ_RGBLED        100

extern int init_pwm(int channel, int freq, int duty);
extern int turn_pwm(int channel, int status);
extern int term_pwm(int channel);

extern int turn_beep(int times);

#endif   /* ----- #ifndef _PWM_H_  ----- */