/*********************************************************************************
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* Copyright: (C) 2021 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: pwm.h
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* Description: This file is used to control PWM buzzer/Led
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*
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* Pin connection:
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* PWM Module Raspberry Pi Board
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* VCC <-----> 5V
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* buzzer <-----> #Pin32(BCM GPIO12)
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* Led <-----> #Pin33(BCM GPIO13)
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* GND <-----> GND
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*
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* /boot/config.txt:
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*
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* dtoverlay=pwm,pin=12,func=4 (Buzzer)
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* dtoverlay=pwm,pin=13,func=4 (Led)
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*
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********************************************************************************/
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#ifndef _PWM_H_
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#define _PWM_H_
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#define PWMCHIP_PATH "/sys/class/pwm/pwmchip0"
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#define ENABLE 1
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#define DISABLE 0
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#define CHN_BEEPER 0
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#define FRQ_BEEPER 2700
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#define CHN_RGBLED 1
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#define FRQ_RGBLED 100
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extern int init_pwm(int channel, int freq, int duty);
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extern int turn_pwm(int channel, int status);
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extern int term_pwm(int channel);
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extern int turn_beep(int times);
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#endif /* ----- #ifndef _PWM_H_ ----- */
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