mirror of
https://github.com/bluekitchen/btstack.git
synced 2025-03-30 16:20:24 +00:00
stm32-f4discovery-cc256x: audio sample microphone, but simulate sine wave
This commit is contained in:
Matthias Ringwald
parent
f0acaf2eec
commit
0bb91267e2
@ -35,17 +35,20 @@
|
||||
*
|
||||
*/
|
||||
|
||||
#define __BTSTACK_FILE__ "hal_audio_f4_discovery.c"
|
||||
|
||||
#include "hal_audio.h"
|
||||
#include "btstack_debug.h"
|
||||
#include "stm32f4_discovery_audio.h"
|
||||
|
||||
// output
|
||||
#define OUTPUT_BUFFER_NUM_SAMPLES 512
|
||||
#define NUM_OUTPUT_BUFFERS 2
|
||||
|
||||
// #define MEASURE_SAMPLE_RATE
|
||||
|
||||
static void (*audio_played_handler)(uint8_t buffer_index);
|
||||
static int started;
|
||||
static int playback_started;
|
||||
|
||||
// our storage
|
||||
static int16_t output_buffer[NUM_OUTPUT_BUFFERS * OUTPUT_BUFFER_NUM_SAMPLES * 2]; // stereo
|
||||
@ -55,6 +58,23 @@ static uint32_t stream_start_ms;
|
||||
static uint32_t stream_samples;
|
||||
#endif
|
||||
|
||||
// input
|
||||
#define INPUT_BUFFER_NUM_SAMPLES 512
|
||||
#define NUM_INPUT_BUFFERS 2
|
||||
|
||||
static int recording_started;
|
||||
static int32_t recording_sample_rate;
|
||||
|
||||
static void (*audio_recorded_callback)(const int16_t * buffer, uint16_t num_samples);
|
||||
|
||||
static int16_t input_buffer[NUM_INPUT_BUFFERS * INPUT_BUFFER_NUM_SAMPLES]; // mono
|
||||
|
||||
// 2048 16-bit samples decimation -> half/complete every 10 ms -> 160 audio samples
|
||||
|
||||
static uint16_t pdm_buffer[2048];
|
||||
#define NUM_SINE_SAMPLES 160
|
||||
|
||||
|
||||
void BSP_AUDIO_OUT_HalfTransfer_CallBack(void){
|
||||
|
||||
#ifdef MEASURE_SAMPLE_RATE
|
||||
@ -134,7 +154,7 @@ int16_t * hal_audio_sink_get_output_buffer(uint8_t buffer_index){
|
||||
* @brief Start stream
|
||||
*/
|
||||
void hal_audio_sink_start(void){
|
||||
started = 1;
|
||||
playback_started = 1;
|
||||
// BSP_AUDIO_OUT_Play gets number bytes -> 1 frame - 16 bit/stereo = 4 bytes
|
||||
BSP_AUDIO_OUT_Play( (uint16_t*) output_buffer, NUM_OUTPUT_BUFFERS * OUTPUT_BUFFER_NUM_SAMPLES * 4);
|
||||
}
|
||||
@ -143,7 +163,7 @@ void hal_audio_sink_start(void){
|
||||
* @brief Stop stream
|
||||
*/
|
||||
void hal_audio_sink_stop(void){
|
||||
started = 0;
|
||||
playback_started = 0;
|
||||
BSP_AUDIO_OUT_Stop(CODEC_PDWN_HW);
|
||||
}
|
||||
|
||||
@ -151,11 +171,69 @@ void hal_audio_sink_stop(void){
|
||||
* @brief Close audio codec
|
||||
*/
|
||||
void hal_audio_sink_close(void){
|
||||
if (started){
|
||||
if (playback_started){
|
||||
hal_audio_sink_close();
|
||||
}
|
||||
}
|
||||
|
||||
// temp sine simulator
|
||||
// input signal: pre-computed sine wave, 266 Hz at 16000 kHz
|
||||
static const int16_t sine_int16_at_16000hz[] = {
|
||||
0, 3135, 6237, 9270, 12202, 14999, 17633, 20073, 22294, 24270,
|
||||
25980, 27406, 28531, 29344, 29835, 30000, 29835, 29344, 28531, 27406,
|
||||
25980, 24270, 22294, 20073, 17633, 14999, 12202, 9270, 6237, 3135,
|
||||
0, -3135, -6237, -9270, -12202, -14999, -17633, -20073, -22294, -24270,
|
||||
-25980, -27406, -28531, -29344, -29835, -30000, -29835, -29344, -28531, -27406,
|
||||
-25980, -24270, -22294, -20073, -17633, -14999, -12202, -9270, -6237, -3135,
|
||||
};
|
||||
static unsigned int phase;
|
||||
|
||||
// 8 kHz samples in host endianess
|
||||
static void sco_demo_sine_wave_int16_at_8000_hz_host_endian(unsigned int num_samples, int16_t * data){
|
||||
unsigned int i;
|
||||
for (i=0; i < num_samples; i++){
|
||||
data[i] = sine_int16_at_16000hz[phase++];
|
||||
// ony use every second sample from 16khz table to get 8khz
|
||||
phase += 2;
|
||||
if (phase >= (sizeof(sine_int16_at_16000hz) / sizeof(int16_t))){
|
||||
phase = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 16 kHz samples in host endianess
|
||||
static void sco_demo_sine_wave_int16_at_16000_hz_host_endian(unsigned int num_samples, int16_t * data){
|
||||
unsigned int i;
|
||||
for (i=0; i < num_samples; i++){
|
||||
data[i] = sine_int16_at_16000hz[phase++];
|
||||
if (phase >= (sizeof(sine_int16_at_16000hz) / sizeof(int16_t))){
|
||||
phase = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static int buffer = 0;
|
||||
|
||||
static void generate_sine(void){
|
||||
log_info("generate_sine %u", NUM_SINE_SAMPLES);
|
||||
if (recording_sample_rate == 8000){
|
||||
sco_demo_sine_wave_int16_at_8000_hz_host_endian(NUM_SINE_SAMPLES, &input_buffer[buffer * NUM_SINE_SAMPLES]);
|
||||
} else {
|
||||
sco_demo_sine_wave_int16_at_16000_hz_host_endian(NUM_SINE_SAMPLES, &input_buffer[buffer * NUM_SINE_SAMPLES]);
|
||||
}
|
||||
// notify
|
||||
(*audio_recorded_callback)(&input_buffer[buffer * NUM_SINE_SAMPLES], NUM_SINE_SAMPLES);
|
||||
|
||||
// swap buffer
|
||||
buffer = 1 - buffer;
|
||||
}
|
||||
|
||||
void BSP_AUDIO_IN_TransferComplete_CallBack(void){
|
||||
generate_sine();
|
||||
}
|
||||
void BSP_AUDIO_IN_HalfTransfer_CallBack(void){
|
||||
generate_sine();
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Setup audio codec for recording using specified samplerate and number of channels
|
||||
@ -166,26 +244,35 @@ void hal_audio_sink_close(void){
|
||||
void hal_audio_source_init(uint8_t channels,
|
||||
uint32_t sample_rate,
|
||||
void (*buffer_recorded_callback)(const int16_t * buffer, uint16_t num_samples)){
|
||||
// TODO
|
||||
|
||||
BSP_AUDIO_IN_Init(sample_rate, 16, channels);
|
||||
audio_recorded_callback = buffer_recorded_callback;
|
||||
recording_sample_rate = sample_rate;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* @brief Start stream
|
||||
*/
|
||||
void hal_audio_source_start(void){
|
||||
// TODO
|
||||
BSP_AUDIO_IN_Record(pdm_buffer, sizeof(pdm_buffer) / 2);
|
||||
recording_started = 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Stop stream
|
||||
*/
|
||||
void hal_audio_source_stop(void){
|
||||
// TODO
|
||||
if (!recording_started) return;
|
||||
BSP_AUDIO_IN_Stop();
|
||||
recording_started = 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Close audio codec
|
||||
*/
|
||||
void hal_audio_source_close(void){
|
||||
// TODO
|
||||
if (recording_started) {
|
||||
hal_audio_source_stop();
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user