From 19e42196dbe22e707129ad48f45f9346bdaf1277 Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Mon, 1 May 2017 10:37:49 +0100
Subject: [PATCH] Fn for control of audio codec reset signal.

---
 firmware/common/portapack_io.cpp | 11 +++++++++++
 firmware/common/portapack_io.hpp |  1 +
 2 files changed, 12 insertions(+)

diff --git a/firmware/common/portapack_io.cpp b/firmware/common/portapack_io.cpp
index aa053129..5668ad28 100644
--- a/firmware/common/portapack_io.cpp
+++ b/firmware/common/portapack_io.cpp
@@ -64,6 +64,17 @@ void IO::lcd_reset_state(const bool active) {
 	io_write(1, io_reg);
 }
 
+void IO::audio_reset_state(const bool active) {
+	/* Reset signal for audio codec. Some audio codecs (e.g. WM8731) do not
+	 * implement reset signal, only soft reset via I2C.
+	 */
+	/* NOTE: This overwrites the contents of the IO register, which for now
+	 * have no significance. But someday...?
+	 */
+	io_reg = (io_reg & 0xfd) | ((active ? 1 : 0) << 1);
+	io_write(1, io_reg);
+}
+
 uint32_t IO::io_update(const TouchPinsConfig write_value) {
 	/* Very touchy code to save context of PortaPack data bus while the
 	 * resistive touch pin drive is changed. Order of operations is
diff --git a/firmware/common/portapack_io.hpp b/firmware/common/portapack_io.hpp
index ed1c82fb..9ae46485 100644
--- a/firmware/common/portapack_io.hpp
+++ b/firmware/common/portapack_io.hpp
@@ -100,6 +100,7 @@ public:
 
 	void lcd_backlight(const bool value);
 	void lcd_reset_state(const bool active);
+	void audio_reset_state(const bool active);
 
 	void lcd_data_write_command_and_data(
 		const uint_fast8_t command,