不韋 呂
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:
- 3:a6df3a2de219
- Parent:
- 1:ac0a67a0deec
- Child:
- 5:3465b7b7acb8
--- a/main.cpp Thu Jan 07 09:48:29 2016 +0000
+++ b/main.cpp Fri Jan 08 13:03:24 2016 +0000
@@ -2,7 +2,7 @@
// Realtime spectrum analyzer
// Input: MEMS microphone or CN11
//
-// 2016/01/06, Copyright (c) 2016 MIKAMI, Naoki
+// 2016/01/08, Copyright (c) 2016 MIKAMI, Naoki
//------------------------------------------------
#include "main.h"
@@ -14,6 +14,14 @@
__IO int32_t audio_in_buffer_offset = 0;
__IO int32_t audio_in_buffer_length = 0;
+// Switching input device
+void SwitchInputDevice(int sw)
+{
+ uint16_t dev = (sw == 0) ? INPUT_DEVICE_DIGITAL_MICROPHONE_2
+ : INPUT_DEVICE_INPUT_LINE_1;
+ InitRunAudioIn(dev, I2S_AUDIOFREQ_16K);
+}
+
int main()
{
const int FS = 8000; // Sampling frequency: 8 kHz
@@ -65,7 +73,7 @@
WaveformDisplay waveDisp(lcd, X_WAV, Y_WAV, N_DATA, 9,
AXIS_COLOR, LINE_COLOR, BACK_COLOR);
- SpectrumDisplay disp(lcd, N_FFT, X0, Y0, -40, DB1, BIN, W_DB, FS,
+ SpectrumDisplay disp(lcd, N_FFT, X0, Y0, -45, DB1, BIN, W_DB, FS,
AXIS_COLOR, LINE_COLOR, BACK_COLOR);
// Linear prediction: order = 10
// Cepstral smoothing: highest quefrency = 40
@@ -73,8 +81,8 @@
// Initialize the infinite loop procedure
int select = -1;
- uint16_t inputDevice;
- int mic = 0;
+// int mic = 0;
+ int sw = 0; // 0: mic, 1: line
int stop = 0;
int16_t sn[N_DATA];
@@ -88,23 +96,16 @@
{
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);
+ SwitchInputDevice(sw);
+ micLine.Draw(sw, TOUCHED_COLOR);
+ micLine.Redraw(1-sw);
}
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 (micLine.GetTouchedNumber(sw, TOUCHED_COLOR))
+ SwitchInputDevice(sw);
if (audio_in_buffer_captured)
{