I have added some M5-functions to show something on the screen, change the volume for both internal speaker and external audio.
My question, my screen does only show a white area on the M5-Basic Version, and sometimes I see some screen-garbling on a black screen when pushing a button clearing the screen with M5.Lcd.clear();
On the M5-Grey the screen starts white and then turns black as per instruction. But no texts.
Do you have any idea where this interference comes from? Some shared I2S port or something?
I would like to integrate the sound-stream playing in my project, and there I use the screen on the M5.
If you have any wise judgement, that would be welcome.
PS: What I intended with this script is to add some buttons to control the volume. Button A to switch between Internal Speaker and Button B to lower the volume and Button C to make the volume higher in steps.
// ==========================================================
// Added by PV:
#include <Arduino.h>
#include <M5Stack.h>
// PV This script uses both the Speaker Jack on the M5Stack NODE Base and the speaker of the M5Stack
#include <WM8978.h> /* https://github.com/CelliesProjects/wm8978-esp32 */
#include <Audio.h> /* https://github.com/schreibfaul1/ESP32-audioI2S */
/* M5Stack Node WM8978 I2C pins */
#define I2C_SDA 21
#define I2C_SCL 22
/* M5Stack Node I2S pins */
#define I2S_BCK 5
#define I2S_WS 13
#define I2S_DOUT 2
#define I2S_DIN 34
/* M5Stack WM8978 MCLK gpio number and frequency */
#define I2S_MCLKPIN 0
#define I2S_MFREQ (24 * 1000 * 1000)
WM8978 dac;
Audio audio; // PV: I believe that this line starts to disrupt the screen operation.
char audio_stream_str[100];
void setup() {
M5.begin(); // M5.begin(bool LCDEnable, bool SDEnable, bool SerialEnable, bool I2CEnable)
delay(2000);
Serial.println(F("M5Node Test , playing a Audio Stream from Internet"));
M5.Lcd.setTextFont(4);
M5.Lcd.setCursor(20, 100);
M5.Lcd.print("Music-Stream Player");
delay(3000);
/* Setup wm8978 I2C interface */
if (!dac.begin(I2C_SDA, I2C_SCL)) {
ESP_LOGE(TAG, "Error setting up dac. System halted");
while (1) delay(100);
}
/* Setup wm8978 MCLK on gpio - for example M5Stack Node needs this clock on gpio 0 */
double retval = dac.setPinMCLK(I2S_MCLKPIN, I2S_MFREQ);
if (!retval)
ESP_LOGE(TAG, "Could not set %.2fMHz clock signal on GPIO %i", I2S_MFREQ / (1000.0 * 1000.0), I2S_MCLKPIN);
else
ESP_LOGI(TAG, "Set %.2fMHz clock signal on GPIO %i", retval / (1000.0 * 1000.0), I2S_MCLKPIN);
/* Setup wm8978 I2S interface */
audio.setPinout(I2S_BCK, I2S_WS, I2S_DOUT, I2S_DIN);
WiFi.begin("xxx", "xxx");
while (!WiFi.isConnected()) {
Serial.print(F("."));
delay(100);
}
ESP_LOGI(TAG, "Connected");
ESP_LOGI(TAG, "Starting MP3...\n");
//audio.connecttohost("http://icecast.omroep.nl/3fm-bb-mp3");
strcpy_P(audio_stream_str, PSTR("http://icecast.omroep.nl/3fm-bb-mp3"));
audio.connecttohost(audio_stream_str);
dac.setSPKvol(40); /* max 63 */
//dac.setSPKvol(55); // OK volume
//dac.setSPKvol(57); // Seems to be the sweetspot for the Internal Speaker
//dac.setSPKvol(59); // 59 is a bit distorted
//dac.setSPKvol(63); /* 63 is overmodulating */
dac.setHPvol(32, 32); // See : https://github.com/CelliesProjects/wm8978-esp32/blob/master/src/WM8978.cpp
} // End of setup()
void loop() {
char my_tmp_str[100];
static char volume_control_device = 'O';
static int OutputVol = 32; // Default Output-Volume (Through 3.5mm jack)
static int SpeakerVol = 40; // Default Speaker-Volume (Through M5Stack Speaker)
audio.loop();
//delay(1);
M5.update();
if (M5.BtnA.wasPressed()) {
M5.Lcd.clear();
M5.Lcd.printf("A wasPressed \r\n");
Serial.println("A wasPressed");
if (volume_control_device == 'O'){
M5.Lcd.printf("Internal Speaker Control\r\n");
Serial.printf("Internal Speaker Control\r\n");
volume_control_device = 'I';
} else {
M5.Lcd.printf("External Speaker Control\r\n");
Serial.printf("External Speaker Control\r\n");
volume_control_device = 'O';
}
}
if (M5.BtnB.wasPressed()) {
M5.Lcd.clear();
M5.Lcd.printf("B wasPressed \r\n");
Serial.println("B wasPressed");
if (volume_control_device == 'O'){
OutputVol--;
OutputVol--;
if (OutputVol < 0){
OutputVol = 0;
}
dac.setHPvol(OutputVol, OutputVol);
M5.Lcd.printf("Output volume %d\r\n", OutputVol);
Serial.printf("Output volume %d\r\n", OutputVol);
} else {
SpeakerVol--;
SpeakerVol--;
if (SpeakerVol < 0){
SpeakerVol = 0;
}
dac.setSPKvol(SpeakerVol);
M5.Lcd.printf("Speaker volume %d\r\n", SpeakerVol);
Serial.printf("Speaker volume %d\r\n", SpeakerVol);
}
}
if (M5.BtnC.wasPressed()) {
M5.Lcd.clear();
M5.Lcd.printf("C wasPressed \r\n");
Serial.println("C wasPressed");
if (volume_control_device == 'O'){
OutputVol++;
OutputVol++;
if (OutputVol > 63){
OutputVol = 63;
}
dac.setHPvol(OutputVol, OutputVol);
M5.Lcd.printf("Output volume %d\r\n", OutputVol);
Serial.printf("Output volume %d\r\n", OutputVol);
} else {
SpeakerVol++;
SpeakerVol++;
if (SpeakerVol > 63){
SpeakerVol = 63;
}
dac.setSPKvol(SpeakerVol);
M5.Lcd.printf("Speaker volume %d\r\n", SpeakerVol);
Serial.printf("Speaker volume %d\r\n", SpeakerVol);
}
}
} // End of loop()
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