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Arduino 上手教程

Cardputer Mic 麦克风

M5Cardputer Mic相关API与案例程序。

案例程序

cpp
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#include <M5Cardputer.h>
static constexpr const size_t record_number = 256;
static constexpr const size_t record_length = 240;
static constexpr const size_t record_size = record_number * record_length;
static constexpr const size_t record_samplerate = 17000;
static int16_t prev_y[record_length];
static int16_t prev_h[record_length];
static size_t rec_record_idx = 2;
static size_t draw_record_idx = 0;
static int16_t *rec_data;
void setup(void) {
auto cfg = M5.config();
M5Cardputer.begin(cfg);
M5Cardputer.Display.startWrite();
M5Cardputer.Display.setRotation(1);
M5Cardputer.Display.setTextDatum(top_center);
M5Cardputer.Display.setTextColor(WHITE);
M5Cardputer.Display.setFont(&fonts::FreeSansBoldOblique12pt7b);
rec_data = (typeof(rec_data))heap_caps_malloc(record_size *
sizeof(int16_t),
MALLOC_CAP_8BIT);
memset(rec_data, 0, record_size * sizeof(int16_t));
M5Cardputer.Speaker.setVolume(255);
/// Since the microphone and speaker cannot be used at the same time,
// turn
/// off the speaker here.
M5Cardputer.Speaker.end();
M5Cardputer.Mic.begin();
M5Cardputer.Display.fillCircle(70, 15, 8, RED);
M5Cardputer.Display.drawString("REC", 120, 3);
}
void loop(void) {
M5Cardputer.update();
if (M5Cardputer.Mic.isEnabled()) {
static constexpr int shift = 6;
auto data = &rec_data[rec_record_idx * record_length];
if (M5Cardputer.Mic.record(data, record_length, record_samplerate)) {
data = &rec_data[draw_record_idx * record_length];
int32_t w = M5Cardputer.Display.width();
if (w > record_length - 1) {
w = record_length - 1;
}
for (int32_t x = 0; x < w; ++x) {
M5Cardputer.Display.writeFastVLine(x, prev_y[x], prev_h[x],
TFT_BLACK);
int32_t y1 = (data[x] >> shift);
int32_t y2 = (data[x + 1] >> shift);
if (y1 > y2) {
int32_t tmp = y1;
y1 = y2;
y2 = tmp;
}
int32_t y = ((M5Cardputer.Display.height()) >> 1) + y1;
int32_t h = ((M5Cardputer.Display.height()) >> 1) + y2 + 1 - y;
prev_y[x] = y;
prev_h[x] = h;
M5Cardputer.Display.writeFastVLine(x, prev_y[x], prev_h[x],
WHITE);
}
M5Cardputer.Display.display();
M5Cardputer.Display.fillCircle(70, 15, 8, RED);
M5Cardputer.Display.drawString("REC", 120, 3);
if (++draw_record_idx >= record_number) {
draw_record_idx = 0;
}
if (++rec_record_idx >= record_number) {
rec_record_idx = 0;
}
}
}
if (M5Cardputer.BtnA.wasHold()) {
auto cfg = M5Cardputer.Mic.config();
cfg.noise_filter_level = (cfg.noise_filter_level + 8) & 255;
M5Cardputer.Mic.config(cfg);
M5Cardputer.Display.clear();
M5Cardputer.Display.fillCircle(70, 15, 8, GREEN);
M5Cardputer.Display.drawString("NF:" + String(cfg.noise_filter_level),
120, 3);
} else if (M5Cardputer.BtnA.wasClicked()) {
if (M5Cardputer.Speaker.isEnabled()) {
M5Cardputer.Display.clear();
while (M5Cardputer.Mic.isRecording()) {
delay(1);
}
/// Since the microphone and speaker cannot be used at the same
/// time, turn off the microphone here.
M5Cardputer.Mic.end();
M5Cardputer.Speaker.begin();
M5Cardputer.Display.fillTriangle(70 - 8, 15 - 8, 70 - 8, 15 + 8,
70 + 8, 15, 0x1c9f);
M5Cardputer.Display.drawString("PLAY", 120, 3);
int start_pos = rec_record_idx * record_length;
if (start_pos < record_size) {
M5Cardputer.Speaker.playRaw(&rec_data[start_pos],
record_size - start_pos,
record_samplerate, false, 1, 0);
}
if (start_pos > 0) {
M5Cardputer.Speaker.playRaw(rec_data, start_pos,
record_samplerate, false, 1, 0);
}
do {
delay(1);
M5Cardputer.update();
} while (M5Cardputer.Speaker.isPlaying());
/// Since the microphone and speaker cannot be used at the same
/// time, turn off the speaker here.
M5Cardputer.Speaker.end();
M5Cardputer.Mic.begin();
M5Cardputer.Display.clear();
M5Cardputer.Display.fillCircle(70, 15, 8, RED);
M5Cardputer.Display.drawString("REC", 120, 3);
}
}
}

API

M5Cardputer库基于M5Unified库实现, Mic部分使用了M5Unified库中的Mic_Class, 更多相关的API可以参考下方文档:

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