mirror/tinyusb
1
0
Fork 0
mirror of https://github.com/hathach/tinyusb.git synced 2025-02-15 21:40:18 +00:00
Code Issues Packages Projects Releases Wiki Activity

Optimize audio_4_channel_mic waveform data.

Browse Source
This commit is contained in:
HiFiPhile 2024-04-09 23:11:43 +02:00
parent 5f4d6ae20c
commit 0d4465a098
1 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
examples/device/audio_4_channel_mic/src/main.c
View File

@ -104,39 +104,39 @@ int main(void)
// Generate dummy data
#if CFG_TUD_AUDIO_ENABLE_ENCODING
uint16_t * p_buff = i2s_dummy_buffer[0];
uint16_t dataVal = 1;
uint16_t dataVal = 0;
for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE/1000; cnt++)
{
// CH0 saw wave
*p_buff++ = dataVal;
// CH1 inverted saw wave
*p_buff++ = 60 + AUDIO_SAMPLE_RATE/1000 - dataVal;
dataVal++;
*p_buff++ = 3200 + AUDIO_SAMPLE_RATE/1000 - dataVal;
dataVal+= 32;
}
p_buff = i2s_dummy_buffer[1];
for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE/1000; cnt++)
{
// CH3 square wave
*p_buff++ = cnt < (AUDIO_SAMPLE_RATE/1000/2) ? 120:170;
*p_buff++ = cnt < (AUDIO_SAMPLE_RATE/1000/2) ? 3400:5000;
// CH4 sinus wave
float t = 2*3.1415f * cnt / (AUDIO_SAMPLE_RATE/1000);
*p_buff++ = (uint16_t)(sinf(t) * 25) + 200;
*p_buff++ = (uint16_t)((int16_t)(sinf(t) * 750) + 6000);
}
#else
uint16_t * p_buff = i2s_dummy_buffer;
uint16_t dataVal = 1;
uint16_t dataVal = 0;
for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE/1000; cnt++)
{
// CH0 saw wave
*p_buff++ = dataVal;
// CH1 inverted saw wave
*p_buff++ = 60 + AUDIO_SAMPLE_RATE/1000 - dataVal;
dataVal++;
*p_buff++ = 3200 + AUDIO_SAMPLE_RATE/1000 - dataVal;
dataVal+= 32;
// CH3 square wave
*p_buff++ = cnt < (AUDIO_SAMPLE_RATE/1000/2) ? 120:170;
*p_buff++ = cnt < (AUDIO_SAMPLE_RATE/1000/2) ? 3400:5000;
// CH4 sinus wave
float t = 2*3.1415f * cnt / (AUDIO_SAMPLE_RATE/1000);
*p_buff++ = (uint16_t)(sinf(t) * 25) + 200;
*p_buff++ = (uint16_t)((int16_t)(sinf(t) * 750) + 6000);
}
#endif