Persist audio (#1110)

* Add credits
* Persist audio, add volume to apps
* Remove comment
* Hack around apparent alignment problem

firmware/common/portapack_persistent_memory.cpp

@@ -22,6 +22,7 @@
 
 #include "portapack_persistent_memory.hpp"
 
+#include "audio.hpp"
 #include "portapack.hpp"
 #include "hal.h"
 
@@ -75,7 +76,7 @@ constexpr clkout_freq_range_t clkout_freq_range{10, 60000};
 constexpr uint32_t clkout_freq_reset_value{10000};
 
 enum data_structure_version_enum : uint32_t {
-    VERSION_CURRENT = 0x10000002,
+    VERSION_CURRENT = 0x10000003,
 };
 
 static const uint32_t TOUCH_CALIBRATION_MAGIC = 0x074af82f;
@@ -305,6 +306,9 @@ struct data_t {
     // Rotary encoder dial sensitivity (encoder.cpp/hpp)
     uint8_t encoder_dial_sensitivity;
 
+    // Headphone volume in centibels.
+    int32_t headphone_volume_cb;
+
     constexpr data_t()
         : structure_version(data_structure_version_enum::VERSION_CURRENT),
           tuned_frequency(tuned_frequency_reset_value),
@@ -341,7 +345,8 @@ struct data_t {
           updown_frequency_rx_correction(0),
           frequency_tx_correction(0),
           updown_frequency_tx_correction(0),
-          encoder_dial_sensitivity(0) {
+          encoder_dial_sensitivity(0),
+          headphone_volume_cb(-600) {
     }
 };
 
@@ -423,6 +428,9 @@ namespace cache {
 
 void defaults() {
     cached_backup_ram = backup_ram_t();
+    *data = data_t();  // This is a workaround for apparently alignment issue
+                       // that is causing backup_ram_t's block copy to be
+                       // misaligned. This force sets values through the struct.
 
     // defaults values for recon app
     set_recon_autosave_freqs(false);
@@ -469,6 +477,17 @@ void set_tuned_frequency(const rf::Frequency new_value) {
     data->tuned_frequency = rf::tuning_range.clip(new_value);
 }
 
+volume_t headphone_volume() {
+    auto volume = volume_t::centibel(data->headphone_volume_cb);
+    volume = audio::headphone::volume_range().limit(volume);
+    return volume;
+}
+
+void set_headphone_volume(volume_t new_value) {
+    new_value = audio::headphone::volume_range().limit(new_value);
+    data->headphone_volume_cb = new_value.centibel();
+}
+
 ppb_t correction_ppb() {
     ppb_range.reset_if_outside(data->correction_ppb, ppb_reset_value);
     return data->correction_ppb;

firmware/common/portapack_persistent_memory.hpp

@@ -31,6 +31,7 @@
 #include "touch.hpp"
 #include "modems.hpp"
 #include "serializer.hpp"
+#include "volume.hpp"
 
 // persistant memory from/to sdcard flag file
 #define PMEM_FILEFLAG "/SETTINGS/PMEM_FILEFLAG"
@@ -132,6 +133,9 @@ using ppb_t = int32_t;
 rf::Frequency tuned_frequency();
 void set_tuned_frequency(const rf::Frequency new_value);
 
+volume_t headphone_volume();
+void set_headphone_volume(volume_t new_value);
+
 ppb_t correction_ppb();
 void set_correction_ppb(const ppb_t new_value);
 

firmware/common/volume.hpp

@@ -23,6 +23,7 @@
 #define __VOLUME_H__
 
 #include <cstdint>
+#include "utility.hpp"
 
 class volume_t {
    public:
@@ -89,13 +90,7 @@ struct volume_range_t {
     volume_t max;
 
     volume_t limit(const volume_t value) const {
-        if (value < min) {
-            return min;
-        }
-        if (value > max) {
-            return max;
-        }
-        return value;
+        return clip(value, min, max);
     }
 
     volume_t normalize(const volume_t value) const {