kopia lustrzana https://github.com/eleccoder/raspi-pico-aprs-tnc
Code documentaion and minor changes
eleccoder
rodzic
1bb2d955cd
commit
ca76756c1b
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@ -27,6 +27,19 @@
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#define APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ (22050)
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/** \brief Generates the analog AFSK signal for a given APRS message at GPIO-pin 'GP0'
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*
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* \param call_sign_src The source call sign
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* \param call_sign_dst The destination call sign
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* \param aprs_path_1 The first APRS path
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* \param aprs_path_2 The second APRS path
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* \param aprs_message The APRS message text
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* \param latitude_in_deg The latitude of the geo-location (in degrees)
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* \param longitude_in_deg The longitude of the geo-location (in degrees)
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* \param altitude_in_m The altitude of the geo-location (in meters)
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* \param volume The volume level of the generated AFSK signal (0 ... 255)
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* \param is_loop_forever If 'true', the transmission of the signal will be continuously repeated
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*/
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void sendAPRS(const char* call_sign_src,
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const char* call_sign_dst,
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const char* aprs_path_1,
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@ -36,9 +49,17 @@ void sendAPRS(const char* call_sign_src,
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const double longitude_in_deg,
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const double altitude_in_m,
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const uint8_t volume,
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const bool is_loop);
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const bool is_loop_forever);
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/** \brief Generates a 1 KHz sine wave signal at GPIO-pin 'GP0'
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*
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* \param sample_freq_in_hz The sampling frequency to be used for the audio signal
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* \param volume The volume level of the generated AFSK signal (0 ... 255)
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*
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* \warning ATTOW, use 'APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ' as
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* the only value for the 'sample_freq_in_hz' parameter
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*/
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void send1kHz(unsigned int sample_freq_in_hz, uint8_t volume);
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#endif // APRS_PICO_H
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@ -30,12 +30,20 @@
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typedef struct AudioCallBackUserData
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{
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unsigned int aprs_sample_freq_in_hz;
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bool is_loop;
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bool is_loop_forever;
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uint8_t volume;
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} AudioCallBackUserData_t;
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/** \brief Init function for the Pico audio PWM library
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*
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* \param sample_freq_in_hz The sampling frequency to be used for audio signals
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* \param audio_buffer_format The format of the audio buffers to be created, representing
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* the data format of the audio samples
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*
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* \return A pool of audio buffers to be used for rendering an audio signal
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*/
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static audio_buffer_pool_t* init_audio(unsigned int sample_freq_in_hz, uint16_t audio_buffer_format)
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{
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const int NUM_AUDIO_BUFFERS = 3;
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@ -64,7 +72,11 @@ static audio_buffer_pool_t* init_audio(unsigned int sample_freq_in_hz, uint16_t
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}
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static void init(unsigned int sample_freq_in_hz)
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/** \brief Init function for the Pico's clock system and the Pico's standard library
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*
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* \param sample_freq_in_hz The sampling frequency to be used for rendering audio signals
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*/
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static void init_system(unsigned int sample_freq_in_hz)
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{
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// WARNING: ATTOW, the pico audio PWM lib worked only @ 22050 Hz sampling frequency and 48 MHz system clock
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// This is documented here: https://github.com/raspberrypi/pico-extras
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@ -79,7 +91,10 @@ static void init(unsigned int sample_freq_in_hz)
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// Compensate a non-'PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ' sampling frequency
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// by a adapting the system clock accordingly
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float sys_clock_in_mhz = 48.0f * (float)sample_freq_in_hz / (float)APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ;
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const float SYS_CLOCK_FREQ_OF_PICO_EXTRA_AUDIO_PWM_LIB_IN_MHZ = 48.0f;
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float sys_clock_in_mhz = SYS_CLOCK_FREQ_OF_PICO_EXTRA_AUDIO_PWM_LIB_IN_MHZ * (float)sample_freq_in_hz /
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(float)APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ;
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// Round to full Mhz to increase the chance that 'set_sys_clock_khz()' can exactly realize this frequency
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sys_clock_in_mhz = round(sys_clock_in_mhz);
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@ -91,8 +106,16 @@ static void init(unsigned int sample_freq_in_hz)
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}
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static void fill_audio_buffer(audio_buffer_pool_t* audio_pool, const int16_t* pcm_data,
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unsigned int num_samples, uint8_t volume, bool is_loop_forever)
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/** \brief Renders given PCM audio samples
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*
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* \param audio_pool The pool of audio buffers to be used for rendering an audio signal
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* \param pcm_data The PCM audio samples to be rendered
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* \param num_samples The number of samples to be rendered
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* \param volume The volume level of the generated AFSK signal (0 ... 255)
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* \param is_loop_forever If 'true', the rendering of the audio samples will be continuously repeated
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*/
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static void render_audio_samples(audio_buffer_pool_t* audio_pool, const int16_t* pcm_data,
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unsigned int num_samples, uint8_t volume, bool is_loop_forever)
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{
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unsigned int pos = 0u;
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bool is_keep_going = true;
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@ -127,20 +150,26 @@ static void fill_audio_buffer(audio_buffer_pool_t* audio_pool, const int16_t* pc
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}
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/** \brief The callback function to render the generated PCM audio samples of an APRS message
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*
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* \param callback_user_data User data provided by the caller function of this callback
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* \param pcm_data The PCM audio samples to be rendered
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* \param num_samples The number of samples the PCM data consist of
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*/
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static void sendAPRS_audioCallback(void* callback_user_data, int16_t* pcm_data, size_t num_samples)
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{
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const AudioCallBackUserData_t user_data = *((const AudioCallBackUserData_t*)callback_user_data);
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audio_buffer_pool_t* audio_pool = init_audio(user_data.aprs_sample_freq_in_hz, AUDIO_BUFFER_FORMAT_PCM_S16);
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fill_audio_buffer(audio_pool, pcm_data, num_samples, user_data.volume, user_data.is_loop);
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render_audio_samples(audio_pool, pcm_data, num_samples, user_data.volume, user_data.is_loop_forever);
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}
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// Test tone: 1 kHz sine wave
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// See the header file for documentation
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void send1kHz( unsigned int sample_freq_in_hz, uint8_t volume)
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{
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init(sample_freq_in_hz);
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init_system(sample_freq_in_hz);
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const unsigned int TONE_FREQ_IN_HZ = 1000u;
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const unsigned int num_samples = sample_freq_in_hz / TONE_FREQ_IN_HZ;
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@ -159,12 +188,13 @@ void send1kHz( unsigned int sample_freq_in_hz, uint8_t volume)
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audio_buffer_pool_t* audio_pool = init_audio(sample_freq_in_hz, AUDIO_BUFFER_FORMAT_PCM_S16);
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fill_audio_buffer(audio_pool, sine_wave_table, num_samples, volume, true);
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render_audio_samples(audio_pool, sine_wave_table, num_samples, volume, true);
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free(sine_wave_table);
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}
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// See the header file for documentation
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void sendAPRS(const char* call_sign_src,
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const char* call_sign_dst,
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const char* aprs_path_1,
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@ -174,15 +204,15 @@ void sendAPRS(const char* call_sign_src,
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const double longitude_in_deg,
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const double altitude_in_m,
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const uint8_t volume,
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const bool is_loop)
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const bool is_loop_forever)
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{
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static AudioCallBackUserData_t callback_user_data;
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callback_user_data.aprs_sample_freq_in_hz = 48000u; // Known from the 'ax25beacon' library
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callback_user_data.is_loop = is_loop;
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callback_user_data.is_loop_forever = is_loop_forever;
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callback_user_data.volume = volume;
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init(callback_user_data.aprs_sample_freq_in_hz);
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init_system(callback_user_data.aprs_sample_freq_in_hz);
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ax25_beacon((void*)&callback_user_data,
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sendAPRS_audioCallback,
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@ -18,7 +18,7 @@
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#include <aprs_pico.h>
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#define SINE_WAVE_TEST (0) // For test & debug
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#define SINE_WAVE_TEST (0) // For testing & debugging
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int main()
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@ -36,9 +36,9 @@ int main()
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"PATH1",
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"PATH2",
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"Test message",
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10.0, // Lat in deg
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20.0, // Long in deg
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100.0, // Alt in m
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10.0, // Latitude in deg
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20.0, // Longitude in deg
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100.0, // Altitude in m
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128u, // Volume (0 ... 255)
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false); // Loop forever
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