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esp32_multitrack_looper/esp32_audio_kit_module.ino
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/*
* Copyright (c) 2021 Marcel Licence
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Dieses Programm ist Freie Software: Sie können es unter den Bedingungen
* der GNU General Public License, wie von der Free Software Foundation,
* Version 3 der Lizenz oder (nach Ihrer Wahl) jeder neueren
* veröffentlichten Version, weiter verteilen und/oder modifizieren.
*
* Dieses Programm wird in der Hoffnung bereitgestellt, dass es nützlich sein wird, jedoch
* OHNE JEDE GEWÄHR,; sogar ohne die implizite
* Gewähr der MARKTFÄHIGKEIT oder EIGNUNG FÜR EINEN BESTIMMTEN ZWECK.
* Siehe die GNU General Public License für weitere Einzelheiten.
*
* Sie sollten eine Kopie der GNU General Public License zusammen mit diesem
* Programm erhalten haben. Wenn nicht, siehe <https://www.gnu.org/licenses/>.
*/
/**
* @file esp32_audio_kit_module.ino
* @author Marcel Licence
* @date 12.10.2021
*
* @brief This file contains basic stuff to work with the ESP32 Audio Kit V2.2 module
*
* @see ESP32 Audio Kit AC101 codec failure - Get synthesizer projects working based on ES8388 - https://youtu.be/8UB3fYPjqSk
* @see Instructions: http://myosuploads3.banggood.com/products/20210306/20210306011116instruction.pdf
* @see Schematic: https://docs.ai-thinker.com/_media/esp32-audio-kit_v2.2_sch.pdf
*/
#ifdef __CDT_PARSER__
#include <cdt.h>
#endif
#ifdef ESP32_AUDIO_KIT
#ifdef AC101_ENABLED
#include "AC101.h" /* only compatible with forked repo: https://github.com/marcel-licence/AC101 */
#endif
//#define BUTTON_DEBUG_MSG
#define PIN_LED4 (22)
#define PIN_LED5 (19)
#ifdef AUDIO_KIT_BUTTON_DIGITAL
/*
* when not modified and R66-R70 are placed on the board
*/
#define PIN_KEY_1 (36)
#define PIN_KEY_2 (13)
#define PIN_KEY_3 (19)
#define PIN_KEY_4 (23)
#define PIN_KEY_5 (18)
#define PIN_KEY_6 (5)
#define PIN_PLAY PIN_KEY_4
#define PIN_VOL_UP PIN_KEY_5
#define PIN_VOL_DOWN PIN_KEY_6
#endif
#ifdef AUDIO_KIT_BUTTON_ANALOG
/*
* modification required:
* - remove R66-R70
* - insert R60-R64 (0 Ohm or solder bridge)
* - insert R55-R59 using 1.8kOhm (recommended but other values might be possible with tweaking the code)
*/
#ifndef PIN_KEY_ANALOG
#define PIN_KEY_ANALOG (36)
#endif
#define KEY_SETTLE_VAL 9 /* use higher value if anaog buton detection is unstable */
uint32_t keyMin[7] = {4095 - 32, 0, 462 - 32, 925 - 32, 1283 - 32, 1570 - 32, 1800 - 32};
uint32_t keyMax[7] = {4095 + 32, 0 + 32, 525 + 32, 1006 + 32, 1374 + 32, 1570 + 32, 1800 + 32 };
#endif
#define OUTPUT_PIN 0
#define MCLK_CH 0
#define PWM_BIT 1
#ifdef AC101_ENABLED
static AC101 ac;
#endif
/* actually only supporting 16 bit */
#define SAMPLE_SIZE_16BIT
//#define SAMPLE_SIZE_24BIT
//#define SAMPLE_SIZE_32BIT
#ifndef SAMPLE_RATE
#define SAMPLE_RATE 44100
#endif
#define CHANNEL_COUNT 2
#define WORD_SIZE 16
#define I2S1CLK (512*SAMPLE_RATE)
#define BCLK (SAMPLE_RATE*CHANNEL_COUNT*WORD_SIZE)
#define LRCK (SAMPLE_RATE*CHANNEL_COUNT)
typedef void(*audioKitButtonCb)(uint8_t, uint8_t);
extern audioKitButtonCb audioKitButtonCallback;
#ifdef AC101_ENABLED
/*
* this function could be used to set up the masterclock
* it is not necessary to use the ac101
*/
void ac101_mclk_setup()
{
// Put a signal out on pin
uint32_t freq = SAMPLE_RATE * 512; /* The maximal frequency is 80000000 / 2^bit_num */
Serial.printf("Output frequency: %d\n", freq);
ledcSetup(MCLK_CH, freq, PWM_BIT);
ledcAttachPin(OUTPUT_PIN, MCLK_CH);
ledcWrite(MCLK_CH, 1 << (PWM_BIT - 1)); /* 50% duty -> The available duty levels are (2^bit_num)-1, where bit_num can be 1-15. */
}
/*
* complete setup of the ac101 to enable in/output
*/
void ac101_setup()
{
Serial.printf("Connect to AC101 codec... ");
while (not ac.begin(AC101_PIN_SDA, AC101_PIN_SCL))
{
Serial.printf("Failed!\n");
delay(1000);
}
Serial.printf("OK\n");
#ifdef SAMPLE_SIZE_24BIT
ac.SetI2sWordSize(AC101::WORD_SIZE_24_BITS);
#endif
#ifdef SAMPLE_SIZE_16BIT
ac.SetI2sWordSize(AC101::WORD_SIZE_16_BITS);
#endif
#if (SAMPLE_RATE==44100)&&(defined(SAMPLE_SIZE_16BIT))
ac.SetI2sSampleRate(AC101::SAMPLE_RATE_44100);
/*
* BCLK: 44100 * 2 * 16 = 1411200 Hz
* SYSCLK: 512 * fs = 512* 44100 = 22579200 Hz
*
* I2S1CLK/BCLK1 -> 512 * 44100 / 44100*2*16
* BCLK1/LRCK -> 44100*2*16 / 44100 Obacht ... ein clock cycle goes high and low
* means 32 when 32 bits are in a LR word channel * word_size
*/
ac.SetI2sClock(AC101::BCLK_DIV_16, false, AC101::LRCK_DIV_32, false);
ac.SetI2sMode(AC101::MODE_SLAVE);
ac.SetI2sWordSize(AC101::WORD_SIZE_16_BITS);
ac.SetI2sFormat(AC101::DATA_FORMAT_I2S);
#endif
ac.SetVolumeSpeaker(3);
ac.SetVolumeHeadphone(99);
#if 1
ac.SetLineSource();
#else
ac.SetMicSource(); /* handle with care: mic is very sensitive and might cause feedback using amp!!! */
#endif
#if 0
ac.DumpRegisters();
#endif
// Enable amplifier
#if 0 /* amplifier only required when speakers attached? */
pinMode(GPIO_PA_EN, OUTPUT);
digitalWrite(GPIO_PA_EN, HIGH);
#endif
}
#endif /* #ifdef AC101_ENABLED */
/*
* pullup required to enable reading the buttons (buttons will connect them to ground if pressed)
*/
void button_setup()
{
#ifdef AUDIO_KIT_BUTTON_DIGITAL
// Configure keys on ESP32 Audio Kit board
pinMode(PIN_PLAY, INPUT_PULLUP);
pinMode(PIN_VOL_UP, INPUT_PULLUP);
pinMode(PIN_VOL_DOWN, INPUT_PULLUP);
#endif
#ifdef AUDIO_KIT_BUTTON_ANALOG_OLD
adcAttachPin(PIN_KEY_ANALOG);
analogReadResolution(10);
analogSetAttenuation(ADC_11db);
#endif
}
#ifdef AC101_ENABLED
/*
* selects the microphone as audio source
* handle with care: mic is very sensitive and might cause feedback using amp!!!
*/
void ac101_setSourceMic(void)
{
ac.SetMicSource();
}
/*
* selects the line in as input
*/
void ac101_setSourceLine(void)
{
ac.SetLineSource();
}
#endif /* #ifdef AC101_ENABLED */
/*
* very bad implementation checking the button state
* there is some work required for a better functionality
*/
void button_loop()
{
#ifdef AUDIO_KIT_BUTTON_DIGITAL
if (digitalRead(PIN_PLAY) == LOW)
{
Serial.println("PIN_PLAY pressed");
if (buttonMapping.key4_pressed != NULL)
{
buttonMapping.key4_pressed();
}
}
if (digitalRead(PIN_VOL_UP) == LOW)
{
Serial.println("PIN_VOL_UP pressed");
if (buttonMapping.key5_pressed != NULL)
{
buttonMapping.key5_pressed();
}
}
if (digitalRead(PIN_VOL_DOWN) == LOW)
{
Serial.println("PIN_VOL_DOWN pressed");
if (buttonMapping.key6_pressed != NULL)
{
buttonMapping.key6_pressed();
}
}
#endif
#ifdef AUDIO_KIT_BUTTON_ANALOG
static uint32_t lastKeyAD = 0xFFFF;
static uint32_t keyAD = 0;
static uint8_t pressedKey = 0;
static uint8_t newPressedKey = 0;
static uint8_t pressedKeyLast = 0;
static uint8_t keySettle = 0;
keyAD = analogRead(PIN_KEY_ANALOG);
if (keyAD != lastKeyAD)
{
//Serial.printf("keyAd: %d\n", keyAD);
lastKeyAD = keyAD;
//pressedKey = 0;
for (int i = 0; i < 7; i ++)
{
if ((keyAD >= keyMin[i]) && (keyAD < keyMax[i]))
{
newPressedKey = i;
}
}
if (newPressedKey != pressedKey)
{
keySettle = KEY_SETTLE_VAL;
pressedKey = newPressedKey;
}
}
if (keySettle > 0)
{
keySettle--;
if (keySettle == 0)
{
if (pressedKey != pressedKeyLast)
{
if (pressedKeyLast > 0)
{
#ifdef BUTTON_DEBUG_MSG
Serial.printf("Key %d up\n", pressedKeyLast);
#endif
if (audioKitButtonCallback != NULL)
{
audioKitButtonCallback(pressedKeyLast - 1, 0);
}
}
if (pressedKey > 0)
{
#ifdef BUTTON_DEBUG_MSG
Serial.printf("Key %d down\n", pressedKey);
#endif
if (audioKitButtonCallback != NULL)
{
audioKitButtonCallback(pressedKey - 1, 1);
}
}
pressedKeyLast = pressedKey;
}
}
}
#endif
}
#endif
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