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| author | Simon Glass <sjg@chromium.org> | 2018-11-15 19:56:13 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2018-11-29 09:30:05 -0700 |
| commit | 7d92b0609093a047ce4b113d77ccd3cc78325e8f (patch) | |
| tree | 4afa25f53b27bf4f76cac7e0a80ef8bb1de36242 | |
| parent | 03f11e87a86307903f40e74495936184063bab79 (diff) | |
| download | u-boot-7d92b0609093a047ce4b113d77ccd3cc78325e8f.zip u-boot-7d92b0609093a047ce4b113d77ccd3cc78325e8f.tar.gz u-boot-7d92b0609093a047ce4b113d77ccd3cc78325e8f.tar.bz2 | |
sound: Add sample rate as a parameter for square wave
At present this value is hard-coded in the function that generates a
square wave. Since sample rates vary between different hardware, it makes
more sense to have this as a parameter.
Update the function and its users.
Signed-off-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | arch/sandbox/cpu/sdl.c | 2 | ||||
| -rw-r--r-- | drivers/sound/sound-i2s.c | 3 | ||||
| -rw-r--r-- | drivers/sound/sound.c | 6 | ||||
| -rw-r--r-- | include/sound.h | 4 |
4 files changed, 9 insertions, 6 deletions
diff --git a/arch/sandbox/cpu/sdl.c b/arch/sandbox/cpu/sdl.c index adcb738..36f1bf0 100644 --- a/arch/sandbox/cpu/sdl.c +++ b/arch/sandbox/cpu/sdl.c @@ -322,7 +322,7 @@ int sandbox_sdl_sound_start(uint frequency) if (!sdl.audio_active) return -1; sdl.frequency = frequency; - sound_create_square_wave((unsigned short *)sdl.audio_data, + sound_create_square_wave(22050, (unsigned short *)sdl.audio_data, sdl.audio_size, frequency); sdl.audio_pos = 0; SDL_PauseAudio(0); diff --git a/drivers/sound/sound-i2s.c b/drivers/sound/sound-i2s.c index 9f09e3b..f0f0b79 100644 --- a/drivers/sound/sound-i2s.c +++ b/drivers/sound/sound-i2s.c @@ -185,7 +185,8 @@ int sound_play(uint32_t msec, uint32_t frequency) return -1; } - sound_create_square_wave((unsigned short *)data, + sound_create_square_wave(g_i2stx_pri.samplingrate, + (unsigned short *)data, data_size / sizeof(unsigned short), frequency); diff --git a/drivers/sound/sound.c b/drivers/sound/sound.c index 6c1eb4c..4f0ad0d 100644 --- a/drivers/sound/sound.c +++ b/drivers/sound/sound.c @@ -7,11 +7,11 @@ #include <common.h> #include <sound.h> -void sound_create_square_wave(unsigned short *data, int size, uint32_t freq) +void sound_create_square_wave(uint sample_rate, unsigned short *data, int size, + uint freq) { - const int sample = 48000; const unsigned short amplitude = 16000; /* between 1 and 32767 */ - const int period = freq ? sample / freq : 0; + const int period = freq ? sample_rate / freq : 0; const int half = period / 2; assert(freq); diff --git a/include/sound.h b/include/sound.h index 3269f23..77bfe6a 100644 --- a/include/sound.h +++ b/include/sound.h @@ -31,11 +31,13 @@ struct sound_codec_info { /* * Generates square wave sound data for 1 second * + * @param sample_rate Sample rate in Hz * @param data data buffer pointer * @param size size of the buffer * @param freq frequency of the wave */ -void sound_create_square_wave(unsigned short *data, int size, uint32_t freq); +void sound_create_square_wave(uint sample_rate, unsigned short *data, int size, + uint freq); /* * Initialises audio sub system |