M5Cardputer Mic related APIs and case programs.
#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); } }}
The M5Cardputer library is based on the M5Unified library implementation, the Mic part uses the Mic_Class
from the M5Unified library, for more related APIs you can refer to the following document: