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Version using MEMS microphone and CODEC for the program "F746_RealtimeSpectrumAnalyzer". "F746_RealtimeSpectrumAnalyzer" の入力を MEMS のマイクと CODEC に変更.このプログラムは Tomona Nanase さんが作成し DISCO-F746NG_Oscilloscope の名前で登録しているプログラムで, CODEC を使って入力する部分を参考にして作成.このプログラムの説明は,CQ出版社のインターフェース誌,2016年4月号に掲載.
Dependencies: BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed
Diff: main.cpp
- Revision:
- 0:0e5131366580
- Child:
- 1:ac0a67a0deec
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Wed Jan 06 12:46:15 2016 +0000 @@ -0,0 +1,136 @@ +//------------------------------------------------ +// Realtime spectrum analyzer +// Input: MEMS microphone or CN11 +// +// 2016/01/06, Copyright (c) 2016 MIKAMI, Naoki +//------------------------------------------------ + +#include "main.h" + +using namespace Mikami; + +int16_t audio_in_buffer[BufferSize]; +__IO bool audio_in_buffer_captured = false; +__IO int32_t audio_in_buffer_offset = 0; +__IO int32_t audio_in_buffer_length = 0; + +int main() +{ + const int FS = 8000; // Sampling frequency: 8 kHz + const int N_DATA = N_DATA_; // Number of data to be analyzed + const int N_FFT = 512; // Number of date for FFT + + const int X_WAV = 44; // Origin for x axis of waveform + const int Y_WAV = 36; // Origin for y axis of waveform + const int X0 = 40; // Origin for x axis of spectrum + const int Y0 = 234; // Origin for y axis of spectrum + const float DB1 = 2.4f; // Pixels for 1 dB + const int BIN = 1; // Pixels per bin + const int W_DB = 60; // Range in dB to be displayed + const int X0_BTN = 340; // Holizontal position for left of buttons + + const uint32_t BACK_COLOR = 0xFF006A6C; // Teal green + const uint32_t INACTIVE_COLOR = BACK_COLOR & 0xD0FFFFFF; + const uint32_t TOUCHED_COLOR = 0xFF7F7FFF; + const uint32_t ORIGINAL_COLOR = 0xFF0068B7; + const uint32_t INACTIVE_TEXT_COLOR = LCD_COLOR_GRAY; + const uint32_t AXIS_COLOR = 0xFFCCFFFF; + const uint32_t LINE_COLOR = LCD_COLOR_CYAN; + + LCD_DISCO_F746NG lcd; // Object for LCD display + TS_DISCO_F746NG ts; // Object for touch pannel + + lcd.Clear(BACK_COLOR); + + // Setting of button group + const string RUN_STOP[2] = {"RUN", "STOP"}; + ButtonGroup runStop(lcd, ts, X0_BTN, 10, 60, 40, + ORIGINAL_COLOR, BACK_COLOR, + 2, RUN_STOP, 5, 0, 2); + runStop.Draw(1, INACTIVE_COLOR, INACTIVE_TEXT_COLOR); + + const string MIC_LINE[2] = {"MIC", "LINE"}; + ButtonGroup micLine(lcd, ts, X0_BTN, 65, 60, 40, + ORIGINAL_COLOR, BACK_COLOR, + 2, MIC_LINE, 5, 0, 2); + micLine.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); + + const string METHOD[3] = {"FFT", "Linear Pred.", "Cepstrum"}; + ButtonGroup method(lcd, ts, X0_BTN, 120, 125, 40, + ORIGINAL_COLOR, BACK_COLOR, + 3, METHOD, 0, 5, 1); + method.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); + // End of button group setting + + WaveformDisplay waveDisp(lcd, X_WAV, Y_WAV, N_DATA, 10, + AXIS_COLOR, LINE_COLOR, BACK_COLOR); + + SpectrumDisplay disp(lcd, N_FFT, X0, Y0, DB1, BIN, W_DB, FS, + AXIS_COLOR, LINE_COLOR, BACK_COLOR); + // Linear prediction: order = 12 + // Cepstral smoothing: highest quefrency = 40 + Selector analyzer(disp, N_DATA, N_FFT, 12, 40); + + // Initialize the infinite loop procedure + int select = -1; + uint16_t inputDevice; + int mic = 0; + int stop = 0; + int16_t sn[N_DATA]; + + // Wait for "RUN" button touched + while (!runStop.Touched(0, TOUCHED_COLOR)) {} + + // Start of spectrum analyzing + method.DrawAll(ORIGINAL_COLOR); + + while (true) + { + if (runStop.Touched(0, TOUCHED_COLOR)) + { + inputDevice = (mic == 0) ? INPUT_DEVICE_DIGITAL_MICROPHONE_2 + : INPUT_DEVICE_INPUT_LINE_1; + InitRunAudioIn(inputDevice, I2S_AUDIOFREQ_16K); + micLine.Draw(mic, TOUCHED_COLOR); + micLine.Redraw(1-mic); + } + + runStop.GetTouchedNumber(stop, TOUCHED_COLOR); + if (stop == 0) + { + if (micLine.GetTouchedNumber(mic, TOUCHED_COLOR)) + { + StopAudioIn(); // Stop sampling + inputDevice = (mic == 0) ? INPUT_DEVICE_DIGITAL_MICROPHONE_2 + : INPUT_DEVICE_INPUT_LINE_1; + InitRunAudioIn(inputDevice, I2S_AUDIOFREQ_16K); + } + + if (audio_in_buffer_captured) + { + // Waveform display + int32_t index = audio_in_buffer_offset; // right mic. or left line +// int32_t index = audio_in_buffer_offset + 1; // left mic. or right line + Decimate(N_DATA, index, audio_in_buffer, sn); + waveDisp.Execute(sn); + // Spectrum analysis and display + analyzer.Execute(sn, select); + audio_in_buffer_captured = false; + } + else + if (method.GetTouchedNumber(select, TOUCHED_COLOR)) + analyzer.Execute(sn, select); + } + else + { + if (runStop.Touched(1)) + { + StopAudioIn(); // Stop sampling + micLine.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); + } + if (method.GetTouchedNumber(select, TOUCHED_COLOR)) + analyzer.Execute(sn, select); + } + } +} +