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2.7.4.9
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| /* | ||
| esp8266_waveform - General purpose waveform generation and control, | ||
| supporting outputs on all pins in parallel. | ||
| Copyright (c) 2018 Earle F. Philhower, III. All rights reserved. | ||
| The core idea is to have a programmable waveform generator with a unique | ||
| high and low period (defined in microseconds or CPU clock cycles). TIMER1 is | ||
| set to 1-shot mode and is always loaded with the time until the next edge | ||
| of any live waveforms. | ||
| Up to one waveform generator per pin supported. | ||
| Each waveform generator is synchronized to the ESP clock cycle counter, not the | ||
| timer. This allows for removing interrupt jitter and delay as the counter | ||
| always increments once per 80MHz clock. Changes to a waveform are | ||
| contiguous and only take effect on the next waveform transition, | ||
| allowing for smooth transitions. | ||
| This replaces older tone(), analogWrite(), and the Servo classes. | ||
| Everywhere in the code where "cycles" is used, it means ESP.getCycleCount() | ||
| clock cycle count, or an interval measured in CPU clock cycles, but not TIMER1 | ||
| cycles (which may be 2 CPU clock cycles @ 160MHz). | ||
| This library is free software; you can redistribute it and/or | ||
| modify it under the terms of the GNU Lesser General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2.1 of the License, or (at your option) any later version. | ||
| This library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Lesser General Public License for more details. | ||
| You should have received a copy of the GNU Lesser General Public | ||
| License along with this library; if not, write to the Free Software | ||
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
| */ | ||
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| #include <Arduino.h> | ||
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| #ifndef __ESP8266_WAVEFORM_H | ||
| #define __ESP8266_WAVEFORM_H | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| // Start or change a waveform of the specified high and low times on specific pin. | ||
| // If runtimeUS > 0 then automatically stop it after that many usecs. | ||
| // Returns true or false on success or failure. | ||
| int startWaveform(uint8_t pin, uint32_t timeHighUS, uint32_t timeLowUS, uint32_t runTimeUS); | ||
| // Start or change a waveform of the specified high and low CPU clock cycles on specific pin. | ||
| // If runtimeCycles > 0 then automatically stop it after that many CPU clock cycles. | ||
| // Returns true or false on success or failure. | ||
| int startWaveformClockCycles(uint8_t pin, uint32_t timeHighCycles, uint32_t timeLowCycles, uint32_t runTimeCycles); | ||
| // Stop a waveform, if any, on the specified pin. | ||
| // Returns true or false on success or failure. | ||
| int stopWaveform(uint8_t pin); | ||
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| // Add a callback function to be called on *EVERY* timer1 trigger. The | ||
| // callback returns the number of microseconds until the next desired call. | ||
| // However, since it is called every timer1 interrupt, it may be called | ||
| // again before this period. It should therefore use the ESP Cycle Counter | ||
| // to determine whether or not to perform an operation. | ||
| // Pass in NULL to disable the callback and, if no other waveforms being | ||
| // generated, stop the timer as well. | ||
| // Make sure the CB function has the ICACHE_RAM_ATTR decorator. | ||
| void setTimer1Callback(uint32_t (*fn)()); | ||
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| // Internal-only calls, not for applications | ||
| extern void _setPWMFreq(uint32_t freq); | ||
| extern bool _stopPWM(int pin); | ||
| extern bool _setPWM(int pin, uint32_t val, uint32_t range); | ||
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
| // Wrapper to include both versions of the waveform generator | ||
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| #ifdef WAVEFORM_LOCKED_PHASE | ||
| #include "core_esp8266_waveform_phase.h" | ||
| #else | ||
| #include "core_esp8266_waveform_pwm.h" | ||
| #endif |
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