diff options
| -rw-r--r-- | Makefile | 12 | ||||
| -rw-r--r-- | README.md | 13 | ||||
| -rw-r--r-- | alsa.cpp | 112 | ||||
| -rw-r--r-- | debian/control | 1 | ||||
| -rw-r--r-- | media/Bmw_M3_f80_StartUp.s16le | bin | 0 -> 352640 bytes |
5 files changed, 138 insertions, 0 deletions
diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..e4157e5 --- /dev/null +++ b/Makefile @@ -0,0 +1,12 @@ +default: alsa + +CXXLIBS=$(shell pkg-config --libs alsa) -lreichwein -lfmt + +alsa: alsa.cpp + $(CXX) $(CXXFLAGS) -O2 -g -Wall -o $@ $^ $(CXXLIBS) + +clean: + rm -f alsa + +sound: + ffmpeg -i Bmw_M3_f80_StartUp.wav -f s16le -af "pan=mono|c0=c1" Bmw_M3_f80_StartUp.s16le diff --git a/README.md b/README.md new file mode 100644 index 0000000..75259dd --- /dev/null +++ b/README.md @@ -0,0 +1,13 @@ +Software + +Test: + +make +./alsa + +Hardware + +MCU: RP2040 +ROM: ? +DAC: DAC80501 +Amp: LM386 diff --git a/alsa.cpp b/alsa.cpp new file mode 100644 index 0000000..c5455b4 --- /dev/null +++ b/alsa.cpp @@ -0,0 +1,112 @@ +#include <libreichwein/file.h> + +#include <alsa/asoundlib.h> + +#include <cstdint> +#include <cmath> +#include <iostream> +#include <limits> + +static const char *device = "default"; /* playback device */ +const snd_pcm_sframes_t nframes = 8*1024; +int16_t buffer[nframes]; /* some random data */ +const double f_tone = 440.0; +const unsigned int f_sample = 48000; +const double pi = std::acos(-1); + +class Sin +{ + +public: + +double generate(double phase) +{ + int i; + + for (i = 0; i < nframes; i++) + buffer[i] = std::sin(i * 2 * pi * f_tone / f_sample + phase) * std::numeric_limits<int16_t>::max(); + + double dummy; + return std::modf((i * 2 * pi * f_tone / f_sample + phase) / (2 * pi), &dummy) * 2 * pi; +} + +}; + +class M3 +{ +private: + std::vector<uint16_t> m_data; +public: + M3() + { + std::string data_s = Reichwein::File::getFile("media/Bmw_M3_f80_StartUp.s16le"); + m_data.resize(data_s.size() / 2); + memcpy(m_data.data(), data_s.data(), data_s.size()); + } + +double generate(double phase) +{ + int i; + size_t j = phase; + + for (i = 0; i < nframes; i++) { + if (j >= m_data.size()) + j = 0; + buffer[i] = m_data[j]; + j++; + } + + return j; +} + +}; + +int main(void) +{ + int err; + unsigned int i; + snd_pcm_t *handle; + snd_pcm_sframes_t frames; + + // non-blocking + if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) { + printf("Playback open error: %s\n", snd_strerror(err)); + exit(EXIT_FAILURE); + } + if ((err = snd_pcm_set_params(handle, + SND_PCM_FORMAT_S16_LE, + SND_PCM_ACCESS_RW_INTERLEAVED, + 1, + f_sample, + 1, + 500000)) < 0) { /* 0.5sec */ + printf("Playback open error: %s\n", snd_strerror(err)); + exit(EXIT_FAILURE); + } + + double phase = 0; + //Sin generator; + M3 generator; + for (i = 0; i < 40; i++) { + phase = generator.generate(phase); + + frames = snd_pcm_writei(handle, buffer, nframes); + if (frames < 0) { + std::cout << "Recovering." << std::endl; + frames = snd_pcm_recover(handle, frames, 0); + } + if (frames < 0) { + printf("snd_pcm_writei failed: %s\n", snd_strerror(frames)); + break; + } + if (frames > 0 && frames < nframes) + printf("Short write (expected %li, wrote %li)\n", nframes, frames); + } + + /* pass the remaining samples, otherwise they're dropped in close */ + err = snd_pcm_drain(handle); + if (err < 0) + printf("snd_pcm_drain failed: %s\n", snd_strerror(err)); + snd_pcm_close(handle); + return 0; +} diff --git a/debian/control b/debian/control new file mode 100644 index 0000000..4e62b70 --- /dev/null +++ b/debian/control @@ -0,0 +1 @@ +Build-Depends: libasound2-dev diff --git a/media/Bmw_M3_f80_StartUp.s16le b/media/Bmw_M3_f80_StartUp.s16le Binary files differnew file mode 100644 index 0000000..49f7252 --- /dev/null +++ b/media/Bmw_M3_f80_StartUp.s16le |