From 0e70fa4865c94bbaaa5d6f62396c13b43a3c6676 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Wed, 3 Jan 2024 14:45:38 +0100
Subject: Initial files

---
 Makefile                       |  12 +++++
 README.md                      |  13 +++++
 alsa.cpp                       | 112 +++++++++++++++++++++++++++++++++++++++++
 debian/control                 |   1 +
 media/Bmw_M3_f80_StartUp.s16le | Bin 0 -> 352640 bytes
 5 files changed, 138 insertions(+)
 create mode 100644 Makefile
 create mode 100644 README.md
 create mode 100644 alsa.cpp
 create mode 100644 debian/control
 create mode 100644 media/Bmw_M3_f80_StartUp.s16le

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
new file mode 100644
index 0000000..49f7252
Binary files /dev/null and b/media/Bmw_M3_f80_StartUp.s16le differ
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