kopia lustrzana https://github.com/eleccoder/raspi-pico-aprs-tnc
Proper initialization for repetitive sending of APRS messages
eleccoder
rodzic
33b941c0de
commit
a43ea3992e
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@ -20,46 +20,48 @@
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#define APRS_PICO_H
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#include <stdint.h>
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#include <stdbool.h>
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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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#define APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ (22050)
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#include <pico/audio_pwm.h> // For 'audio_buffer_pool_t'
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/** \brief Initializes the APRS Pico library
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*
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* \return A pool of audio buffers to be used for rendering any audio signal
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*/
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audio_buffer_pool_t* aprs_pico_init();
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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[in] call_sign_src The source call sign
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* \param[in] call_sign_dst The destination call sign
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* \param[in] aprs_path_1 The first APRS path
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* \param[in] aprs_path_2 The second APRS path
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* \param[in] aprs_message The APRS message text
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* \param[in] latitude_in_deg The latitude of the geo-location (in degrees)
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* \param[in] longitude_in_deg The longitude of the geo-location (in degrees)
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* \param[in] altitude_in_m The altitude of the geo-location (in meters)
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* \param[in] volume The volume level of the generated AFSK signal (0 ... 256)
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* \param[in] is_loop_forever If 'true', the transmission of the signal will be continuously repeated
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* \param[in, out] audio_buffer_pool The pool of audio buffers to be used for rendering the APRS audio signal
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* \param[in] call_sign_src The source call sign
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* \param[in] call_sign_dst The destination call sign
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* \param[in] aprs_path_1 The first APRS path
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* \param[in] aprs_path_2 The second APRS path
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* \param[in] aprs_message The APRS message text (may be 'NULL' pointer)
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* \param[in] latitude_in_deg The latitude of the geo-location (in degrees)
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* \param[in] longitude_in_deg The longitude of the geo-location (in degrees)
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* \param[in] altitude_in_m The altitude of the geo-location (in meters)
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* \param[in] volume The volume level of the generated AFSK signal (0 ... 256)
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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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const char* aprs_path_2,
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const char* aprs_message,
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double latitude_in_deg,
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double longitude_in_deg,
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double altitude_in_m,
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uint16_t volume,
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bool is_loop_forever);
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void aprs_pico_sendAPRS(audio_buffer_pool_t* audio_buffer_pool,
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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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const char* aprs_path_2,
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const char* aprs_message,
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double latitude_in_deg,
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double longitude_in_deg,
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double altitude_in_m,
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uint16_t volume);
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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[in] sample_freq_in_hz The sampling frequency to be used for the audio signal
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* \param[in] volume The volume level of the generated AFSK signal (0 ... 256)
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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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* \param[in, out] audio_buffer_pool The pool of audio buffers to be used for rendering the sine audio signal
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* \param[in] volume The volume level of the generated AFSK signal (0 ... 256)
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*/
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void send1kHz(unsigned int sample_freq_in_hz, uint16_t volume);
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void aprs_pico_send1kHz(audio_buffer_pool_t* audio_buffer_pool, uint16_t volume);
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#endif // APRS_PICO_H
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112
src/aprs_pico.c
112
src/aprs_pico.c
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@ -19,19 +19,24 @@
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#include <aprs_pico.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <math.h>
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#include <pico/stdlib.h>
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#include <pico/audio_pwm.h>
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#include <ax25beacon.h>
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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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#define APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ (22050)
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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_forever; //
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uint16_t volume; // Valid range: 0 ... 256
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audio_buffer_pool_t* audio_buffer_pool; // The pool of audio buffers to be used for rendering an audio signal
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unsigned int aprs_sample_freq_in_hz; // Sample rate of the APRS signal
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uint16_t volume; // Valid range: 0 ... 256
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} AudioCallBackUserData_t;
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@ -42,9 +47,9 @@ typedef struct AudioCallBackUserData
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* \param[in] 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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* \return A pool of audio buffers to be used for rendering any 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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static audio_buffer_pool_t* aprs_pico_initAudio(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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const int SAMPLES_PER_BUFFER = 256;
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@ -72,11 +77,11 @@ static audio_buffer_pool_t* init_audio(unsigned int sample_freq_in_hz, uint16_t
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}
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/** \brief Init function for the Pico's clock system and the Pico's standard library
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/** \brief Init function for the Pico's clock system
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*
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* \param[in] 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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static void aprs_pico_initClock(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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@ -99,30 +104,32 @@ static void init_system(unsigned int 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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set_sys_clock_khz(1000u * (uint32_t)sys_clock_in_mhz, false);
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// With the second parameter set 'true', the function will assert if the frequency is not attainable
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set_sys_clock_khz(1000u * (uint32_t)sys_clock_in_mhz, true);
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}
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stdio_init_all();
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}
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/** \brief Renders given PCM audio samples
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*
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* \param[in, out] audio_pool The pool of audio buffers to be used for rendering an audio signal
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* \param[in] pcm_data The PCM audio samples to be rendered
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* \param[in] num_samples The number of PCM audio samples to be rendered
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* \param[in] volume The volume level of the generated AFSK signal (0 ... 256)
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* \param[in] is_loop_forever If 'true', the rendering of the audio samples will be continuously repeated
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* \param[in, out] audio_buffer_pool The pool of audio buffers to be used for rendering any audio signal
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* \param[in] pcm_data The PCM audio samples to be rendered
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* \param[in] num_samples The number of PCM audio samples to be rendered
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* \param[in] volume The volume level of the generated AFSK signal (0 ... 256)
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* \param[in] 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, uint16_t volume, bool is_loop_forever)
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static void aprs_pico_renderAudioSamples(audio_buffer_pool_t* audio_buffer_pool, const int16_t* pcm_data,
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unsigned int num_samples, uint16_t volume, bool is_loop_forever)
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{
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assert(audio_buffer_pool != NULL);
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assert(pcm_data != NULL);
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unsigned int pos = 0u;
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bool is_keep_going = true;
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while (is_keep_going)
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{
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audio_buffer_t* buffer = take_audio_buffer(audio_pool, true);
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audio_buffer_t* buffer = take_audio_buffer(audio_buffer_pool, true);
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int16_t* samples = (int16_t*)buffer->buffer->bytes;
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for (unsigned int i = 0u; i < buffer->max_sample_count; i++)
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@ -145,7 +152,7 @@ static void render_audio_samples(audio_buffer_pool_t* audio_pool, const int16_t*
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}
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buffer->sample_count = buffer->max_sample_count;
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give_audio_buffer(audio_pool, buffer);
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give_audio_buffer(audio_buffer_pool, buffer);
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}
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}
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@ -156,20 +163,34 @@ static void render_audio_samples(audio_buffer_pool_t* audio_pool, const int16_t*
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* \param[in] pcm_data The PCM audio samples to be rendered
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* \param[in] num_samples The number of samples the PCM data consist of
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*/
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static void sendAPRS_audioCallback(const void* callback_user_data, const int16_t* pcm_data, size_t num_samples)
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static void aprs_pico_sendAPRSAudioCallback(const void* callback_user_data, const int16_t* pcm_data, size_t num_samples)
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{
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assert(callback_user_data != NULL);
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assert(pcm_data != NULL);
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const AudioCallBackUserData_t user_data = *((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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render_audio_samples(audio_pool, pcm_data, num_samples, user_data.volume, user_data.is_loop_forever);
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aprs_pico_renderAudioSamples(user_data.audio_buffer_pool, pcm_data, num_samples, user_data.volume, false);
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}
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// See the header file for documentation
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void send1kHz(unsigned int sample_freq_in_hz, uint16_t volume)
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audio_buffer_pool_t* aprs_pico_init()
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{
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init_system(sample_freq_in_hz);
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return aprs_pico_initAudio(APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ, AUDIO_BUFFER_FORMAT_PCM_S16);
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}
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// See the header file for documentation
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void aprs_pico_send1kHz(audio_buffer_pool_t* audio_buffer_pool, uint16_t volume)
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{
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assert(audio_buffer_pool != NULL);
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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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unsigned int sample_freq_in_hz = APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ;
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aprs_pico_initClock(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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@ -186,36 +207,41 @@ void send1kHz(unsigned int sample_freq_in_hz, uint16_t volume)
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sine_wave_table[i] = (int16_t)(32767.0f * sinf(2.0f * (float)M_PI * (float)i / (float)num_samples));
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}
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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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render_audio_samples(audio_pool, sine_wave_table, num_samples, volume, true);
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aprs_pico_renderAudioSamples(audio_buffer_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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const char* aprs_path_2,
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const char* aprs_message,
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double latitude_in_deg,
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double longitude_in_deg,
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double altitude_in_m,
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uint16_t volume,
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bool is_loop_forever)
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void aprs_pico_sendAPRS(audio_buffer_pool_t* audio_buffer_pool,
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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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const char* aprs_path_2,
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const char* aprs_message,
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double latitude_in_deg,
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double longitude_in_deg,
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double altitude_in_m,
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uint16_t volume)
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{
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// NOTE: 'aprs_message' is allowed to be 'NULL'
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assert(audio_buffer_pool != NULL);
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assert(call_sign_src != NULL);
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assert(call_sign_dst != NULL);
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assert(aprs_path_1 != NULL);
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assert(aprs_path_2 != NULL);
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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_forever = is_loop_forever;
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callback_user_data.audio_buffer_pool = audio_buffer_pool;
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callback_user_data.volume = volume;
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init_system(callback_user_data.aprs_sample_freq_in_hz);
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aprs_pico_initClock(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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aprs_pico_sendAPRSAudioCallback,
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call_sign_src,
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call_sign_dst,
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aprs_path_1,
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@ -17,30 +17,40 @@
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*/
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#include <aprs_pico.h>
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#include <pico/stdlib.h>
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#define SINE_WAVE_TEST (0) // For testing & debugging
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int main()
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{
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stdio_init_all();
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audio_buffer_pool_t* audio_buffer_pool = aprs_pico_init();
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#if (SINE_WAVE_TEST == 1)
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const uint16_t VOLUME = 128u;
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send1kHz(APRS_PICO__PICO_EXTRA_AUDIO_PWM_LIB_FIXED_SAMPLE_FREQ_IN_HZ, VOLUME);
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aprs_pico_send1kHz(audio_buffer_pool, VOLUME);
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#else // !SINE_WAVE_TEST
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// Send an APRS test message
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sendAPRS("SRC", // Src call sign
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"DST", // Dst call sign
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"PATH1",
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"PATH2",
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"Test message",
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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 ... 256)
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true); // Loop forever
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while (true) // Loop forever
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{
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// Send an APRS test message
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aprs_pico_sendAPRS(audio_buffer_pool,
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"SRC", // Source call sign
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"DST", // Destination call sign
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"PATH1", // APRS path #1
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"PATH2", // APRS path #2
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"Test message", // APRS message
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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 ... 256)
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}
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#endif // SINE_WAVE_TEST, !SINE_WAVE_TEST
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