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Enhance audio_4_channel_mic example, plot 4 different waves for each channel.

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HiFiPhile
2023-10-10 18:24:47 +02:00
parent 8b2cb63da8
commit 2ba760a1c1
2 changed files with 26 additions and 20 deletions
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43
examples/device/audio_4_channel_mic/src/main.c
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@@ -34,17 +34,16 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "arm_math.h"
#include "bsp/board_api.h"
#include "tusb.h"
#include "tusb_config.h"
//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+
#ifndef AUDIO_SAMPLE_RATE
#define AUDIO_SAMPLE_RATE 48000
#endif
#define AUDIO_SAMPLE_RATE CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE
/* Blink pattern
* - 250 ms : device not mounted
@@ -70,7 +69,7 @@ uint8_t clkValid;
audio_control_range_2_n_t(1) volumeRng[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX+1]; // Volume range state
audio_control_range_4_n_t(1) sampleFreqRng; // Sample frequency range state
// Audio test data
// Audio test data, each buffer contains 2 channels, buffer[0] for CH0-1, buffer[1] for CH1-2
uint16_t i2s_dummy_buffer[CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO][CFG_TUD_AUDIO_FUNC_1_TX_SUPP_SW_FIFO_SZ/2]; // Ensure half word aligned
void led_blinking_task(void);
@@ -400,7 +399,8 @@ bool tud_audio_tx_done_pre_load_cb(uint8_t rhport, uint8_t itf, uint8_t ep_in, u
(void) ep_in;
(void) cur_alt_setting;
for (uint8_t cnt=0; cnt < CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO; cnt++)
// Write buffer[0] (CH0-1) and buffer[1] (CH1-2) into FIFO
for (uint8_t cnt=0; cnt < 2; cnt++)
{
tud_audio_write_support_ff(cnt, i2s_dummy_buffer[cnt], AUDIO_SAMPLE_RATE/1000 * CFG_TUD_AUDIO_FUNC_1_N_BYTES_PER_SAMPLE_TX * CFG_TUD_AUDIO_FUNC_1_CHANNEL_PER_FIFO_TX);
}
@@ -416,22 +416,27 @@ bool tud_audio_tx_done_post_load_cb(uint8_t rhport, uint16_t n_bytes_copied, uin
(void) ep_in;
(void) cur_alt_setting;
uint16_t dataVal;
// Generate dummy data
for (uint16_t cnt = 0; cnt < CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO; cnt++)
uint16_t * p_buff = i2s_dummy_buffer[0];
uint16_t dataVal = 1;
for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE/1000; cnt++)
{
uint16_t * p_buff = i2s_dummy_buffer[cnt]; // 2 bytes per sample
dataVal = 1;
for (uint16_t cnt2 = 0; cnt2 < AUDIO_SAMPLE_RATE/1000; cnt2++)
{
for (uint8_t cnt3 = 0; cnt3 < CFG_TUD_AUDIO_FUNC_1_CHANNEL_PER_FIFO_TX; cnt3++)
{
*p_buff++ = dataVal;
}
dataVal++;
}
// CH0 saw wave
*p_buff++ = dataVal;
// CH1 inverted saw wave
*p_buff++ = 60 + AUDIO_SAMPLE_RATE/1000 - dataVal;
dataVal++;
}
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;
// CH4 sinus wave
q15_t t = 0x7FFF * cnt / (AUDIO_SAMPLE_RATE/1000);
*p_buff++ = arm_sin_q15(t) / 1300 + 200;
}
return true;
}