#include <driver/dac.h>
#include <driver/i2s.h>
#define TSF_IMPLEMENTATION
#define TSF_NO_STDIO
#include "../ESP8266Audio/src/libtinysoundfont/tsf.h"
#include "../RingBuffer/src/RingBuf.h"
#include "font.h"
int currentLed = 0;
#define DEBUG 0
const size_t row_count = 5;
const size_t col_count = 5;
const int rows[row_count] = { 5, 23, 19, 18, 26 };
const int cols[col_count] = { 17, 33, 16, 21, 22 };
const int adc[row_count] = { 2, 4, 12, 27, 14 };
const int ampEnable = 32;
const int octave_shift = 2;
const int sampleRate = 11025;
char pressed[row_count*col_count] = { 0 };
tsf* g_TinySoundFont = 0;
const i2s_port_t i2sPort = I2S_NUM_0;
void setup() {
Serial.begin(115200);
pinMode(ampEnable, OUTPUT);
digitalWrite(ampEnable, LOW);
dac_i2s_enable();
dac_output_enable(DAC_CHANNEL_1);
static const i2s_config_t i2s_config = {
.mode = (i2s_mode_t)( I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN ),
.sample_rate = sampleRate,
.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
.channel_format = I2S_CHANNEL_FMT_ALL_RIGHT,
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
.dma_buf_count = 8,
.dma_buf_len = 64,
.use_apll = false
};
i2s_driver_install(i2sPort, &i2s_config, 0, NULL);
i2s_set_dac_mode(I2S_DAC_CHANNEL_RIGHT_EN);
for (int i=0;i<row_count;++i) {
pinMode(rows[i], OUTPUT|PULLUP);
pinMode(adc[i], INPUT);
}
for (int i=0;i<col_count;++i) {
pinMode(cols[i], OUTPUT|PULLDOWN);
}
currentLed = 0;
g_TinySoundFont = tsf_load_memory(SoundFont, sizeof(SoundFont));
if (g_TinySoundFont) {
tsf_set_output(g_TinySoundFont, TSF_MONO, sampleRate, 0);
}
else {
Serial.println("failed to start tsf");
}
digitalWrite(ampEnable, HIGH);
}
void tristate(int pin) {
pinMode(pin,OUTPUT|PULLDOWN);
digitalWrite(pin,LOW);
pinMode(pin,INPUT);
}
void power(int pin) {
pinMode(pin,OUTPUT|PULLUP);
digitalWrite(pin,HIGH);
}
void ground(int pin) {
pinMode(pin,OUTPUT|PULLDOWN);
digitalWrite(pin,LOW);
}
void enableLed(int led) {
int row = (led/col_count) % row_count ;
int col = led%col_count;
#if DEBUG & 0x02
Serial.print("enabling ");
Serial.print(row);
Serial.print(" ");
Serial.println(col);
#endif
for (int i=0;i<row_count;++i) {
if (i==row) { power(rows[i]); }
else { ground(rows[i]); }
}
for (int i=0;i<col_count;++i) {
if (i==col) { ground(cols[i]); }
else { tristate(cols[i]); }
}
}
int sense(int led) {
int row = (led/col_count)%row_count;
int value = analogRead(adc[row]);
#if DEBUG & 0x04
Serial.println(value);
#endif
return value < 500;
}
const size_t bufferSize = 1000;
RingBuf<short, bufferSize> buffer;
short intermediateBuffer[bufferSize];
void loop() {
#if DEBUG & 0x01
Serial.print("current led ");
Serial.println(currentLed);
#endif
enableLed(currentLed);
unsigned long t = millis();
size_t written=100;
short value;
while (written > 0) {
value=buffer[0] + 32768;
i2s_write(i2sPort, &value, sizeof(value), &written, 0);
if (written > 0) buffer.pop(value);
}
int toFill = buffer.maxSize() - buffer.size();
if (toFill > 100) {
tsf_render_short(g_TinySoundFont, intermediateBuffer, toFill, 0);
for (int i=0;i<toFill;++i) {
buffer.push(intermediateBuffer[i]);
}
}
while (millis() == t) {
delayMicroseconds(100);
}
if (sense(currentLed)) {
if (!pressed[currentLed]) {
Serial.print(currentLed);
Serial.println(" proximity!");
pressed[currentLed]=1;
if (g_TinySoundFont) {
tsf_note_on(g_TinySoundFont, 0, 36 + currentLed, 1.0f);
}
}
}
else if (pressed[currentLed]) {
Serial.print(currentLed);
Serial.println(" released!");
pressed[currentLed]=0;
if (g_TinySoundFont) {
tsf_note_off(g_TinySoundFont, 0, 36 + currentLed);
}
}
currentLed = (currentLed+1)%(row_count*col_count);
}