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use waveform generator on esp8266

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This commit is contained in:
Stephen Crane 2018-11-18 11:57:51 +00:00
parent 8681074427
commit 231041d7aa
1 changed files with 12 additions and 8 deletions
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20
sound_pwm.cpp
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@ -40,28 +40,32 @@ void PWM::set_freq(unsigned freq) {
ESP_ERROR_CHECK(::ledc_set_freq(SPEED_MODE, TIMER, freq)); ESP_ERROR_CHECK(::ledc_set_freq(SPEED_MODE, TIMER, freq));
} }
#elif defined(PWM_SOUND) #elif defined(ESP8266)
static unsigned pin; #include <core_esp8266_waveform.h>
static unsigned gpio, duty;
const unsigned period = 1024;
void PWM::begin(unsigned gpio) { void PWM::begin(unsigned gpio) {
pin = gpio; ::gpio = gpio;
analogWriteRange(PWM_TOP); pinMode(gpio, OUTPUT);
} }
void PWM::set_duty(unsigned duty) { void PWM::set_duty(unsigned duty) {
analogWrite(pin, duty); ::duty = duty;
} }
void PWM::stop() { void PWM::stop() {
analogWrite(pin, 0); stopWaveform(gpio);
} }
void PWM::set_freq(unsigned freq) { void PWM::set_freq(unsigned freq) {
analogWriteFreq(freq); uint32_t t = 1000000 / freq;
uint32_t h = duty * t / period;
startWaveform(gpio, h, t-h, 0);
} }
#else #else
void PWM::begin(unsigned gpio) { void PWM::begin(unsigned gpio) {
} }