LCD Driver, some teensy code, SDCard code, MBR/FAT32

2021-02-11 20:08:25 +01:00
parent 3babe3f1ef
commit faf6e55bc5
19 changed files with 1679 additions and 25 deletions
--- a/ext/sd/fat32/Structs.h
+++ b/ext/sd/fat32/Structs.h
@@ -0,0 +1,77 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+namespace FAT32 {
+
+	using ClusterNr = uint32_t;
+	using AbsOffset = uint32_t;
+	using AbsPos = uint32_t;
+
+	struct FSDesc {
+		uint16_t bytesPerSector;
+		uint8_t sectorsPerCluster;
+		uint16_t numReservedSectors;
+		uint8_t numberOfFATs;
+		uint32_t sectorsPerFAT;
+		ClusterNr rootDirFirstCluster;
+	};
+
+	struct Precomputed {
+		uint32_t bytesPerCluster;
+		AbsPos startOfFAT;					// absolute byte offset where the FAT begins
+		AbsPos startOfFirstDataCluster;		// absolute byte offset where the first cluster is
+		AbsPos startOfFirstRootDirCluster;	// absolute byte offset where the first root dir cluster is
+		uint32_t dirEntriesPerSector;
+	};
+
+	union Attributes {
+		uint8_t raw;
+		struct {
+			uint8_t readOnly : 1;
+			uint8_t hidden : 1;
+			uint8_t system : 1;
+			uint8_t volumeID : 1;
+			uint8_t directory : 1;
+			uint8_t archive : 1;
+			uint8_t unused1 : 1;
+			uint8_t unused2 : 1;
+		} bits;
+	} __attribute__((packed));
+
+	struct DirEntry {
+
+		unsigned char name[8];
+		unsigned char ext[3];
+		Attributes attr;
+		uint8_t dummy1[8];
+		uint16_t firstClusterHi;
+		uint8_t dummy2[4];
+		uint16_t firstClusterLo;
+		uint32_t size;	// file size in bytes
+
+		bool isUnused() const			{return name[0] == 0xE5;}
+		bool isDirectory() const		{return attr.bits.directory;}
+		bool isEndOfDirectory() const	{return name[0] == 0x00;}
+		bool isLongFileName() const		{return (attr.raw & 0b1111) == 0b1111;}
+
+		uint32_t getFirstCluster() const {return firstClusterHi<<16 | firstClusterLo<<0;}
+
+		std::string getName() const {
+			char buf[16];
+			uint8_t pos = 0;
+			for (uint8_t i = 0; i < 8; ++i) {if (name[i] != ' ') {buf[pos++] = name[i];}}
+			buf[pos++] = '.';
+			for (uint8_t i = 0; i < 8; ++i) {if ( ext[i] != ' ') {buf[pos++] =  ext[i];}}
+			buf[pos] = 0;
+			return std::string(buf);
+		}
+
+	} __attribute__((packed));
+
+	static inline uint16_t getU8(const uint8_t* src)	{return src[0];}
+	static inline uint16_t getU16(const uint8_t* src)	{return src[0]<<0 | src[1]<<8;}
+	static inline uint32_t getU32(const uint8_t* src)	{return src[0]<<0 | src[1]<<8 | src[2]<<16 | src[3]<<24;}
+
+}