From 7efa9057c3bb49f75ef973ef0c29b6078c92ae6b Mon Sep 17 00:00:00 2001
From: dragonmux <git@dragonmux.network>
Date: Tue, 12 Dec 2023 00:11:02 +0000
Subject: [PATCH] sfdpInternal: Implemented a type for handling the write and
 erase granularity information

---
 src/include/sfdpInternal.hxx | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/include/sfdpInternal.hxx b/src/include/sfdpInternal.hxx
index 61bded5..3c4d05e 100644
--- a/src/include/sfdpInternal.hxx
+++ b/src/include/sfdpInternal.hxx
@@ -67,6 +67,28 @@ namespace bmpflash::sfdp
 		void validate() noexcept;
 	};
 
+	struct writeAndEraseGranularity_t
+	{
+	private:
+		uint8_t data{};
+
+	public:
+		[[nodiscard]] std::optional<uint8_t> volatileStatusWriteEnable() const noexcept
+		{
+			// Check if the status register requires any write enables
+			if (!(data & 0x08U))
+				return std::nullopt;
+			// Otherwise check if the device requires 0x06 as write enable
+			if (data & 0x10U)
+				return 0x06U;
+			// If not, then it's 0x50 as write enable
+			return 0x50U;
+		}
+
+		[[nodiscard]] bool supports4KiBErase() const noexcept
+			{ return (data & 0x03U) == 0x01U; }
+	};
+
 	struct fastReadAndAddressing_t
 	{
 	private:
@@ -168,7 +190,7 @@ END_PACKED()
 
 	struct basicParameterTable_t
 	{
-		uint8_t value1{};
+		writeAndEraseGranularity_t writeAndEraseGranularity{};
 		uint8_t sectorEraseOpcode{};
 		fastReadAndAddressing_t fastReadAndAddressing{};
 		uint8_t reserved1{};