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72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
#include <TinySoftPwm.h>
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/*
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_____ ____ __ _ ____ _ _ _ _
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| __ \ / __ \ | \ | | / __ \ | | | | | | | |
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| |__| | | / \_| | . \ | | / / \ \ | | | | \ \ / /
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| _ / | | _ | |\ \| | | |__| | | | | | \ ' /
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| | \ \ | \__/ | | | \ ' | | __ | \ \/ / | |
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|_| \_\ \____/ |_| \__| |_| |_| \__/ |_| 2013
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http://p.loussouarn.free.fr
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****************************************
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* <TinySoftPwm> library Demo *
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****************************************
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This sketch increases the luminosity of the built-in LED of the Digispark.
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When the luminosity reaches its maximum, the luminosity decreases.
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When the luminosity reaches its minimum, the luminosity increases, and so on...
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Note:
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====
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Declare the Pin(s) used in "librarie/TinySoftPwm/TinySoftPwm.h"
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In this sketch, #define TINY_SOFT_PWM_USES_P1 must be enabled (not commented) since it uses the DigiSpark built-in LED wired on P1.
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In this basic example, TinySoftPwm_process() is called periodically using micros(), but it is recommanded to call it from a timer ISR
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to ensure a better periodicity.
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*/
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#define BUILT_IN_LED_PIN 1 /* Digispark Model A (Rev2) built-in LED pin number (Change it to 2 for Model B) */
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void setup()
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{
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TinySoftPwm_begin(128, 0); /* 128 x TinySoftPwm_process() calls before overlap (Frequency tuning), 0 = PWM init for all declared pins */
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}
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void loop()
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{
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static uint32_t StartUs=micros();
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static uint32_t StartMs=millis();
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static uint8_t Pwm=0;
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static int8_t Dir=1;
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/***********************************************************/
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/* Call TinySoftPwm_process() with a period of 60 us */
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/* The PWM frequency = 128 x 60 # 7.7 ms -> F # 130Hz */
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/* 128 is the first argument passed to TinySoftPwm_begin() */
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/***********************************************************/
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if((micros() - StartUs) >= 60)
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{
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/* We arrived here every 60 microseconds */
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StartUs=micros();
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TinySoftPwm_process(); /* This function shall be called periodically (like here, based on micros(), or in a timer ISR) */
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}
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/*************************************************************/
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/* Increment/decrement PWM on LED Pin with a period of 10 ms */
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/*************************************************************/
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if((millis()-StartMs) >= 10)
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{
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/* We arrived here every 10 milliseconds */
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StartMs=millis();
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Pwm+=Dir; /* increment or decrement PWM depending of sign of Dir */
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TinySoftPwm_analogWrite(BUILT_IN_LED_PIN, Pwm); /* Update built-in LED for Digispark */
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if(Pwm==255) Dir=-1; /* if PWM reaches the maximum: change direction */
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if(Pwm==0) Dir=+1; /* if PWM reaches the minimum: change direction */
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}
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}
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