main.cpp

00001 #include "main.h"
00002 
00003 LCD_DISCO_F746NG lcd;
00004 
00005 int16_t audio_in_buffer[BufferSize];
00006 __IO bool audio_in_buffer_captured = false;
00007 __IO int32_t audio_in_buffer_offset = 0;
00008 __IO int32_t audio_in_buffer_length = 0;
00009 
00010 void init_audio_in()
00011 {
00012     if (BSP_AUDIO_IN_Init(INPUT_DEVICE_INPUT_LINE_1, AudioInVolume, SamplingFreq) == AUDIO_ERROR)
00013         error_trap();
00014 
00015     NVIC_SetVector(AUDIO_IN_SAIx_DMAx_IRQ, (uint32_t)&AUDIO_IN_SAIx_DMAx_IRQHandler);
00016 }
00017 
00018 void record_audio_in()
00019 {
00020     if (BSP_AUDIO_IN_Record((uint16_t*)&audio_in_buffer[0], BufferByteSize / 2) == AUDIO_ERROR)
00021         error_trap();
00022 }
00023 
00024 
00025 int main()
00026 {
00027     char strbuf[64];
00028     uint16_t width, height, height_2, graph_height;
00029     double y_factor;
00030 
00031     lcd.Clear(LCD_COLOR_BLACK);
00032     lcd.SetBackColor(LCD_COLOR_BLACK);
00033     lcd.SetTextColor(LCD_COLOR_WHITE);
00034     lcd.SetFont(&Font12);
00035     sprintf(strbuf, "SamplingFreq: %d Hz", SamplingFreq);
00036     lcd.DisplayStringAt(0, 0, (uint8_t *)strbuf, LEFT_MODE);
00037 
00038     width = lcd.GetXSize() - 1;
00039     height = lcd.GetYSize() - 1;
00040     graph_height = height - LINE(1);
00041     height_2 = graph_height / 2;
00042     y_factor = (graph_height * 0.5 * AudioInGraphYFactor) / 32768.0;
00043 
00044     init_audio_in();
00045     record_audio_in();
00046     
00047     while(1) {
00048         if (audio_in_buffer_captured) {
00049             lcd.SetTextColor(LCD_COLOR_BLACK);
00050             lcd.FillRect(0, LINE(1), width, graph_height);
00051             lcd.SetTextColor(LCD_COLOR_WHITE);
00052 
00053             for (int32_t i = audio_in_buffer_offset, j = 0; j < audio_in_buffer_length / 2 - 1 && j < width - 1; j++) {
00054                 uint16_t k = (uint16_t)j;
00055                 int16_t y1 =  (int16_t)(audio_in_buffer[i + 0] * y_factor);
00056                 int16_t y2 =  (int16_t)(audio_in_buffer[i + 4] * y_factor);
00057 
00058                 if (y1 > height_2)
00059                     y1 = height_2;
00060                 else if (y1 < -height_2)
00061                     y1 = -height_2;
00062 
00063                 if (y2 > height_2)
00064                     y2 = height_2;
00065                 else if (y2 < -height_2)
00066                     y2 = -height_2;
00067 
00068                 lcd.DrawLine(k, (uint16_t)(height_2 + y1 + LINE(1)), k + 1, (uint16_t)(height_2 + y2 + LINE(1)));
00069 
00070                 i += 4;
00071             }
00072             audio_in_buffer_captured = false;
00073         }
00074 
00075         wait_ms(AudioInLCDInterval);
00076     }
00077 }