From e773b331cd382b1168e20c56779d5664f26b6c0d Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Mon, 15 Feb 2021 15:05:46 -0500
Subject: [PATCH] Implements register 2 listen.

---
 Machines/Apple/ADB/Keyboard.cpp | 15 +++++++++++++++
 Machines/Apple/ADB/Keyboard.hpp |  1 +
 2 files changed, 16 insertions(+)

diff --git a/Machines/Apple/ADB/Keyboard.cpp b/Machines/Apple/ADB/Keyboard.cpp
index c76faee32..1c3ef4d94 100644
--- a/Machines/Apple/ADB/Keyboard.cpp
+++ b/Machines/Apple/ADB/Keyboard.cpp
@@ -51,10 +51,25 @@ void Keyboard::perform_command(const Command &command) {
 			}
 		break;
 
+		case Command::Type::Listen:
+			// If a listen is incoming for register 2, prepare to capture LED statuses.
+			if(command.reg == 2) {
+				receive_bytes(2);
+			}
+		break;
+
+
 		default: break;
 	}
 }
 
+void Keyboard::did_receive_data(const Command &, const std::vector<uint8_t> &data) {
+	// This must be a register 2 listen; update the LED statuses.
+	// TODO: and possibly display these.
+	modifiers_ = (modifiers_ & 0xfff8) | (data[1] & 7);
+}
+
+
 bool Keyboard::set_key_pressed(Key key, bool is_pressed) {
 	// ADB keyboard events: low 7 bits are a key code; bit 7 is either 0 for pressed or 1 for released.
 	std::lock_guard lock_guard(keys_mutex_);
diff --git a/Machines/Apple/ADB/Keyboard.hpp b/Machines/Apple/ADB/Keyboard.hpp
index 47adf1f4e..a8213dd28 100644
--- a/Machines/Apple/ADB/Keyboard.hpp
+++ b/Machines/Apple/ADB/Keyboard.hpp
@@ -104,6 +104,7 @@ class Keyboard: public ReactiveDevice {
 
 	private:
 		void perform_command(const Command &command) override;
+		void did_receive_data(const Command &, const std::vector<uint8_t> &) override;
 
 		std::mutex keys_mutex_;
 		std::array<bool, 128> pressed_keys_;