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Extra parameter for aprs_pico_send_sine_wave()

main
eleccoder 2022-12-21 23:08:27 +01:00
rodzic 5869d83de5
commit 09256da282
3 zmienionych plików z 10 dodań i 11 usunięć
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3
include/aprs_pico.h
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@ -65,8 +65,9 @@ bool aprs_pico_sendAPRS(audio_buffer_pool_t* audio_buffer_pool,
*
* \param[in, out] audio_buffer_pool The pool of audio buffers to be used for rendering the sine audio signal
* \param[in] freq_in_hz The frequency of the sine wave to be generated (in Hz)
* \param[in] sample_freq_in_hz The sampling frequency of the sine wave to be generated (in Hz)
* \param[in] volume The volume level of the generated signal (0 ... 256)
*/
void aprs_pico_send_sine_wave(audio_buffer_pool_t* audio_buffer_pool, unsigned int freq_in_hz, uint16_t volume);
void aprs_pico_send_sine_wave(audio_buffer_pool_t* audio_buffer_pool, unsigned int freq_in_hz, unsigned int sample_freq_in_hz, uint16_t volume);
#endif // APRS_PICO_H

11
src/aprs_pico.c
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@ -183,20 +183,17 @@ audio_buffer_pool_t* aprs_pico_init()
// See the header file for documentation
void aprs_pico_send_sine_wave(audio_buffer_pool_t* audio_buffer_pool, unsigned int freq_in_hz, uint16_t volume)
void aprs_pico_send_sine_wave(audio_buffer_pool_t* audio_buffer_pool, unsigned int freq_in_hz, unsigned int sample_freq_in_hz, uint16_t volume)
{
assert(audio_buffer_pool != NULL);
// WARNING: ATTOW, the pico audio PWM lib worked only @ 22050 Hz sampling frequency and 48 MHz system clock
// This is documented here: https://github.com/raspberrypi/pico-extras
const unsigned int SAMPLE_FREQ_IN_HZ = APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ;
const unsigned int num_samples_per_period = SAMPLE_FREQ_IN_HZ / freq_in_hz;
typedef int16_t wave_table_value_t;
const wave_table_value_t WAVE_TABLE_VALUE_MAX = INT16_MAX;
aprs_pico_initClock(SAMPLE_FREQ_IN_HZ);
aprs_pico_initClock(sample_freq_in_hz);
const unsigned int num_samples_per_period = sample_freq_in_hz / freq_in_hz;
wave_table_value_t* sine_period_wave_table = malloc(num_samples_per_period * sizeof(wave_table_value_t));

7
src/aprs_pico_example.c
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@ -31,10 +31,11 @@ int main()
#if (SINE_WAVE_TEST == 1)
const unsigned int FREQ_IN_HZ = 1000u;
const uint16_t VOLUME = 128u;
const unsigned int FREQ_IN_HZ = 1000u;
const unsigned int SAMPLE_FREQ_IN_HZ = 48000u;
const uint16_t VOLUME = 128u;
aprs_pico_send_sine_wave(audio_buffer_pool, FREQ_IN_HZ, VOLUME);
aprs_pico_send_sine_wave(audio_buffer_pool, FREQ_IN_HZ, SAMPLE_FREQ_IN_HZ, VOLUME);
#else // !SINE_WAVE_TEST