font

var (
	LetterA = Letter{0x3E, 0x09, 0x09, 0x3E} //A
	LetterB = Letter{0x3F, 0x25, 0x25, 0x1A}
	LetterC = Letter{0x1E, 0x21, 0x21, 0x12}
	LetterD = Letter{0x3F, 0x21, 0x21, 0x1E}
	LetterE = Letter{0x3F, 0x25, 0x25, 0x21}
	LetterF = Letter{0x3F, 0x05, 0x05, 0x01}
	LetterG = Letter{0x1E, 0x21, 0x29, 0x3A}
	LetterH = Letter{0x3F, 0x04, 0x04, 0x3F}
	LetterI = Letter{0x21, 0x3F, 0x21, 0x00}
	LetterJ = Letter{0x10, 0x20, 0x21, 0x1F}
	LetterK = Letter{0x3F, 0x04, 0x1A, 0x21}
	LetterL = Letter{0x3F, 0x20, 0x20, 0x20}
	LetterM = Letter{0x3F, 0x02, 0x02, 0x3F}
	LetterN = Letter{0x3F, 0x02, 0x04, 0x3F}
	LetterO = Letter{0x1E, 0x21, 0x21, 0x1E}
	LetterP = Letter{0x3F, 0x09, 0x09, 0x06}
	LetterQ = Letter{0x1E, 0x21, 0x11, 0x2E}
	LetterR = Letter{0x3F, 0x09, 0x19, 0x26}
	LetterS = Letter{0x22, 0x25, 0x25, 0x19}
	LetterT = Letter{0x01, 0x3F, 0x01, 0x01}
	LetterU = Letter{0x1F, 0x20, 0x20, 0x1F}
	LetterV = Letter{0x0F, 0x10, 0x20, 0x1F}
	LetterW = Letter{0x3F, 0x10, 0x10, 0x3F}
	LetterX = Letter{0x3B, 0x04, 0x04, 0x3B}
	LetterY = Letter{0x03, 0x04, 0x38, 0x04, 0x03} // so far only the Y letter use the 5th column
	LetterZ = Letter{0x31, 0x29, 0x25, 0x23}       // Z

	AllLetters = map[Letter]string{
		LetterA: "A",
		LetterB: "B",
		LetterC: "C",
		LetterD: "D",
		LetterE: "E",
		LetterF: "F",
		LetterG: "G",
		LetterH: "H",
		LetterI: "I",
		LetterJ: "J",
		LetterK: "K",
		LetterL: "L",
		LetterM: "M",
		LetterN: "N",
		LetterO: "O",
		LetterP: "P",
		LetterQ: "Q",
		LetterR: "R",
		LetterS: "S",
		LetterT: "T",
		LetterU: "U",
		LetterV: "V",
		LetterW: "W",
		LetterX: "X",
		LetterY: "Y",
		LetterZ: "Z",
	}
)