Add PWMAudio support for the RP2040 (#597)
Uses the RP2040 HW PWM generator to provide a stereo audio signal.
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@ -0,0 +1,47 @@
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#include <Arduino.h>
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#include "AudioFileSourcePROGMEM.h"
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#include "AudioGeneratorMOD.h"
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#include "AudioOutputPWM.h"
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#if !defined(ARDUINO_ARCH_RP2040)
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void setup() {
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Serial.begin(115200);
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Serial.printf("Only for the RP2040/Raspberry Pi Pico\n");
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}
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void loop() {
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}
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#else
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// 5_steps.mod sample from the mod archive: https://modarchive.org/
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#include "5steps.h"
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AudioGeneratorMOD *mod;
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AudioFileSourcePROGMEM *file;
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AudioOutputPWM *out;
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void setup()
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{
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Serial.begin(115200);
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delay(1000);
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audioLogger = &Serial;
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file = new AudioFileSourcePROGMEM(steps_mod, sizeof(steps_mod));
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out = new AudioOutputPWM();
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mod = new AudioGeneratorMOD();
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mod->SetBufferSize(3*1024);
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mod->SetSampleRate(44100);
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mod->SetStereoSeparation(32);
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mod->begin(file, out);
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}
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void loop()
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{
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if (mod->isRunning()) {
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if (!mod->loop()) mod->stop();
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} else {
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Serial.printf("MOD done\n");
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delay(1000);
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}
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}
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#endif
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@ -23,6 +23,7 @@ AudioOutput KEYWORD1
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AudioOutputI2S KEYWORD1
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AudioOutputI2SNoDAC KEYWORD1
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AudioOutputI2SClass KEYWORD1
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AudioOutputPWM KEYWORD1
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AudioOutputNull KEYWORD1
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AudioOutputBuffer KEYWORD1
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AudioOutputSerialWAV KEYWORD1
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@ -127,7 +127,7 @@ bool AudioGeneratorWAV::ReadWAVInfo()
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return false;
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};
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if (u32 != 0x46464952) {
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Serial.printf_P(PSTR("AudioGeneratorWAV::ReadWAVInfo: cannot read WAV, invalid RIFF header, got: %08X \n"), (uint32_t) u32);
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Serial.printf_P(PSTR("AudioGeneratorWAV::ReadWAVInfo: cannot read WAV, invalid RIFF header\n"));
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return false;
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}
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@ -143,7 +143,7 @@ bool AudioGeneratorWAV::ReadWAVInfo()
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return false;
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};
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if (u32 != 0x45564157) {
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Serial.printf_P(PSTR("AudioGeneratorWAV::ReadWAVInfo: cannot read WAV, invalid WAVE header, got: %08X \n"), (uint32_t) u32);
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Serial.printf_P(PSTR("AudioGeneratorWAV::ReadWAVInfo: cannot read WAV, invalid WAVE header\n"));
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return false;
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}
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@ -0,0 +1,114 @@
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/*
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AudioOutputPWM
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Base class for the RP2040 PWM audio
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Copyright (C) 2023 Earle F. Philhower, III
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if defined(ARDUINO_ARCH_RP2040)
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#include <Arduino.h>
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#include "AudioOutputPWM.h"
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AudioOutputPWM::AudioOutputPWM(long sampleRate, pin_size_t data) {
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pwmOn = false;
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mono = false;
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bps = 16;
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channels = 2;
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hertz = sampleRate;
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doutPin = data;
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SetGain(1.0);
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pwm.setStereo(true);
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}
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AudioOutputPWM::~AudioOutputPWM() {
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stop();
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}
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bool AudioOutputPWM::SetRate(int hz) {
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this->hertz = hz;
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if (pwmOn) {
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pwm.setFrequency(hz);
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}
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return true;
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}
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bool AudioOutputPWM::SetBitsPerSample(int bits) {
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if ( (bits != 16) && (bits != 8) ) return false;
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this->bps = bits;
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return true;
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}
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bool AudioOutputPWM::SetChannels(int channels) {
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if ( (channels < 1) || (channels > 2) ) return false;
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this->channels = channels;
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return true;
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}
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bool AudioOutputPWM::SetOutputModeMono(bool mono) {
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this->mono = mono;
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return true;
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}
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bool AudioOutputPWM::begin() {
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if (!pwmOn) {
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pwm.setPin(doutPin);
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pwm.begin(hertz);
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}
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pwmOn = true;
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SetRate(hertz); // Default
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return true;
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}
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bool AudioOutputPWM::ConsumeSample(int16_t sample[2]) {
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if (!pwmOn)
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return false;
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int16_t ms[2];
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ms[0] = sample[0];
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ms[1] = sample[1];
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MakeSampleStereo16( ms );
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if (this->mono) {
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// Average the two samples and overwrite
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int32_t ttl = ms[LEFTCHANNEL] + ms[RIGHTCHANNEL];
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ms[LEFTCHANNEL] = ms[RIGHTCHANNEL] = (ttl>>1) & 0xffff;
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}
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if (pwm.available()) {
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pwm.write((int16_t) ms[0]);
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pwm.write((int16_t) ms[1]);
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return true;
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} else {
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return false;
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}
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}
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void AudioOutputPWM::flush() {
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pwm.flush();
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}
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bool AudioOutputPWM::stop() {
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if (!pwmOn)
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return false;
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pwm.end();
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pwmOn = false;
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return true;
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}
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#endif
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@ -0,0 +1,57 @@
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/*
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AudioOutputPWM
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Base class for the RP2040 PWM audio output
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Copyright (C) 2023 Earle F. Philhower, III
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "AudioOutput.h"
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#if defined(ARDUINO_ARCH_RP2040)
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#include <Arduino.h>
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#include <PWMAudio.h>
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class AudioOutputPWM : public AudioOutput
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{
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public:
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AudioOutputPWM(long sampleRate = 44100, pin_size_t data = 0);
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virtual ~AudioOutputPWM() override;
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virtual bool SetRate(int hz) override;
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virtual bool SetBitsPerSample(int bits) override;
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virtual bool SetChannels(int channels) override;
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virtual bool begin() override;
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virtual bool ConsumeSample(int16_t sample[2]) override;
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virtual void flush() override;
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virtual bool stop() override;
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bool SetOutputModeMono(bool mono); // Force mono output no matter the input
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protected:
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bool SetPinout();
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virtual int AdjustI2SRate(int hz) { return hz; }
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uint8_t portNo;
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int output_mode;
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bool mono;
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bool pwmOn;
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uint8_t doutPin;
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PWMAudio pwm;
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};
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#endif
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@ -41,6 +41,7 @@
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#include "AudioOutput.h"
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#include "AudioOutputI2S.h"
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#include "AudioOutputI2SNoDAC.h"
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#include "AudioOutputPWM.h"
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#include "AudioOutputMixer.h"
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#include "AudioOutputNull.h"
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#include "AudioOutputSerialWAV.h"
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@ -109,7 +109,11 @@ if [ "$BUILD_TYPE" = "build" ]; then
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install_arduino
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install_esp8266 "$HOME/arduino_ide"
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source "$HOME/arduino_ide/hardware/esp8266com/esp8266/tests/common.sh"
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build_sketches "$HOME/arduino_ide" "$TRAVIS_BUILD_DIR" "-l $HOME/Arduino/libraries" "$BUILD_MOD" "$BUILD_REM" "lm2f"
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export ESP8266_ARDUINO_SKETCHES=$(find $HOME/Arduino/libraries/ESP8266Audio -name *.ino | sort)
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# ESP8266 scripts now expect tools in wrong spot. Use simple and dumb fix
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mkdir -p "$HOME/work/ESP8266Audio/ESP8266Audio"
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ln -s "$HOME/arduino_ide/hardware/esp8266com/esp8266/tools" "$HOME/work/ESP8266Audio/ESP8266Audio/tools"
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build_sketches "$TRAVIS_BUILD_DIR" "$HOME/arduino_ide" "$HOME/arduino_ide/hardware" "$HOME/Arduino/libraries" "$BUILD_MOD" "$BUILD_REM" "lm2f"
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elif [ "$BUILD_TYPE" = "build_esp32" ]; then
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install_arduino
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install_esp32 "$HOME/arduino_ide"
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