From 719a090b3415b282b277aedbb16635fb316a772e Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sat, 20 Sep 2025 20:06:28 -0400
Subject: [PATCH] Retain bit 2.

---
 Components/uPD7002/uPD7002.cpp | 6 ++++--
 Components/uPD7002/uPD7002.hpp | 4 ++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/Components/uPD7002/uPD7002.cpp b/Components/uPD7002/uPD7002.cpp
index 296cb7812..1f0735577 100644
--- a/Components/uPD7002/uPD7002.cpp
+++ b/Components/uPD7002/uPD7002.cpp
@@ -41,8 +41,9 @@ void uPD7002::write(const uint16_t address, const uint8_t value) {
 	const auto local_address = address & 3;
 	if(!local_address) {
 		interrupt_ = false;
-		channel_ = value & 3;
-		high_precision_ = value & 8;
+		channel_ = value & 0b0000'0011;
+		spare_ = value & 0b0000'0100;
+		high_precision_ = value & 0b0000'1000;
 		conversion_time_remaining_ = high_precision_ ? slow_period_ : fast_period_;
 		return;
 	}
@@ -64,6 +65,7 @@ uint8_t uPD7002::read(const uint16_t address) {
 uint8_t uPD7002::status() const {
 	return
 		channel_ |
+		spare_ |
 		(high_precision_ ? 0x08 : 0) |
 		((result_ >> 14) & 0x30) |
 		(conversion_time_remaining_ > HalfCycles(0) ? 0x00 : 0x40) |
diff --git a/Components/uPD7002/uPD7002.hpp b/Components/uPD7002/uPD7002.hpp
index 768f4e485..493afe09a 100644
--- a/Components/uPD7002/uPD7002.hpp
+++ b/Components/uPD7002/uPD7002.hpp
@@ -37,10 +37,10 @@ private:
 	uint16_t result_ = 0;
 	bool interrupt_ = false;
 
-	uint8_t channel_ = 0;
+	uint8_t channel_ = 0, spare_ = 0;
 	bool high_precision_ = false;
 
-	HalfCycles conversion_time_remaining_;
+	HalfCycles conversion_time_remaining_{};
 	HalfCycles fast_period_, slow_period_;
 
 	uint8_t status() const;