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https://github.com/jscrane/r65emu.git
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83 lines
1.7 KiB
C++
83 lines
1.7 KiB
C++
#include <Arduino.h>
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#include "sound_pwm.h"
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#include "hardware.h"
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#if defined(PWM_SOUND) && defined(ESP32)
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#include <driver/ledc.h>
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#define CHANNEL LEDC_CHANNEL_0
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#define TIMER LEDC_TIMER_0
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#define SPEED_MODE LEDC_HIGH_SPEED_MODE
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void PWM::begin(unsigned gpio) {
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ledc_timer_config_t timer_conf;
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timer_conf.duty_resolution = LEDC_TIMER_10_BIT;
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timer_conf.freq_hz = 440;
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timer_conf.speed_mode = SPEED_MODE;
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timer_conf.timer_num = TIMER;
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ESP_ERROR_CHECK(::ledc_timer_config(&timer_conf));
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ledc_channel_config_t ledc_conf;
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ledc_conf.channel = CHANNEL;
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ledc_conf.duty = 0;
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ledc_conf.gpio_num = gpio;
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ledc_conf.intr_type = LEDC_INTR_DISABLE;
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ledc_conf.speed_mode = SPEED_MODE;
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ledc_conf.timer_sel = TIMER;
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ESP_ERROR_CHECK(::ledc_channel_config(&ledc_conf));
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}
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void PWM::set_duty(unsigned duty) {
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ESP_ERROR_CHECK(::ledc_set_duty(SPEED_MODE, CHANNEL, duty));
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ESP_ERROR_CHECK(::ledc_update_duty(SPEED_MODE, CHANNEL));
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}
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void PWM::stop() {
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set_duty(0);
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}
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void PWM::set_freq(unsigned freq) {
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ESP_ERROR_CHECK(::ledc_set_freq(SPEED_MODE, TIMER, freq));
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}
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#elif defined(PWM_SOUND) && defined(ESP8266)
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#include <core_esp8266_waveform.h>
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static unsigned gpio, duty;
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const unsigned period = 1024;
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void PWM::begin(unsigned gpio) {
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::gpio = gpio;
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pinMode(gpio, OUTPUT);
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}
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void PWM::set_duty(unsigned duty) {
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::duty = duty;
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}
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void PWM::stop() {
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stopWaveform(gpio);
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}
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void PWM::set_freq(unsigned freq) {
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uint32_t t = 1000000 / freq;
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uint32_t h = duty * t / period;
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startWaveform(gpio, h, t-h, 0);
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}
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#else
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#pragma message "No PWM"
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void PWM::begin(unsigned gpio) {
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}
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void PWM::set_duty(unsigned duty) {
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}
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void PWM::stop() {
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}
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void PWM::set_freq(unsigned freq) {
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}
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#endif
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