From d5d6e3993cd67238ff245446e69e2f200c3fd0e5 Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Mon, 4 Sep 2023 16:17:55 +1000
Subject: Support changing max volume, persisted to nvs

---
 src/drivers/include/wm8523.hpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'src/drivers/include/wm8523.hpp')

diff --git a/src/drivers/include/wm8523.hpp b/src/drivers/include/wm8523.hpp
index 6dc2e56e..b13cf34b 100644
--- a/src/drivers/include/wm8523.hpp
+++ b/src/drivers/include/wm8523.hpp
@@ -5,12 +5,32 @@
  */
 #pragma once
 
+#include <stdint.h>
 #include <cstdint>
 #include <optional>
 
 namespace drivers {
 namespace wm8523 {
 
+extern const uint16_t kAbsoluteMaxVolume;
+
+extern const uint16_t kAbsoluteMinVolume;
+
+extern const uint16_t kMaxVolumeBeforeClipping;
+
+extern const uint16_t kLineLevelReferenceVolume;
+
+extern const uint16_t kDefaultVolume;
+extern const uint16_t kDefaultMaxVolume;
+
+constexpr auto VolumeToDb(uint16_t vol) -> int_fast8_t {
+  return (vol - kLineLevelReferenceVolume) / 4;
+}
+
+constexpr auto DbToVolume(int_fast8_t db) -> uint16_t {
+  return (db * 4) + kLineLevelReferenceVolume;
+}
+
 enum class Register : uint8_t {
   kReset = 0,
   kRevision = 1,
-- 
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