lab2打包

lab2/朱梓涵24325356/scala/peripheral/FontROM.scala

@@ -0,0 +1,64 @@
+package peripheral
+
+import chisel3.experimental.{ChiselAnnotation, annotate}
+import chisel3.util.experimental.loadMemoryFromFileInline
+import chisel3.{Bundle, Input, Module, Output, SyncReadMem, UInt, _}
+import firrtl.annotations.MemorySynthInit
+
+import java.io.FileWriter
+import java.nio.file.Paths
+import javax.imageio.ImageIO
+
+class FontROM(fontBitmapFilename: String = "vga_font_8x16.bmp") extends Module {
+  val glyphWidth = GlyphInfo.glyphWidth
+  val glyphHeight = GlyphInfo.glyphHeight
+
+  val io = IO(new Bundle {
+    val glyph_index = Input(UInt(7.W))
+    val glyph_y = Input(UInt(4.W))
+
+    val glyph_pixel_byte = Output(UInt(8.W))
+  })
+
+  annotate(new ChiselAnnotation {
+    override def toFirrtl =
+      MemorySynthInit
+  })
+
+  val (hexTxtPath, glyphCount) = readFontBitmap()
+  val mem = SyncReadMem(glyphCount, UInt(8.W))
+  loadMemoryFromFileInline(mem, hexTxtPath.toString.replaceAll("\\\\", "/"))
+  io.glyph_pixel_byte := mem.read(io.glyph_index * GlyphInfo.glyphHeight.U + io.glyph_y, true.B)
+
+  def readFontBitmap() = {
+    val inputStream = getClass.getClassLoader.getResourceAsStream(fontBitmapFilename)
+    val image = ImageIO.read(inputStream)
+
+    val glyphColumns = image.getWidth() / glyphWidth
+    val glyphRows = image.getHeight / glyphHeight
+    val glyphCount = glyphColumns * glyphRows
+    val glyphs = new Array[UInt](glyphCount * GlyphInfo.glyphHeight)
+
+    for (row <- 0 until glyphRows) {
+      for (col <- 0 until glyphColumns) {
+        for (i <- 0 until glyphHeight) {
+          var lineInt = 0
+          for (j <- 0 until glyphWidth) {
+            if (image.getRGB(col * glyphWidth + j, row * glyphHeight + i) != 0xFFFFFFFF) {
+              lineInt |= (1 << j)
+            }
+          }
+          glyphs((row * glyphColumns + col) * GlyphInfo.glyphHeight + i) = lineInt.U(8.W)
+        }
+      }
+    }
+    val currentDir = System.getProperty("user.dir")
+    val hexTxtPath = Paths.get(currentDir, "verilog", f"${fontBitmapFilename}.txt")
+    val writer = new FileWriter(hexTxtPath.toString)
+    for (i <- glyphs.indices) {
+      writer.write(f"@$i%x\n${glyphs(i).litValue}%02x\n")
+    }
+    writer.close()
+    (hexTxtPath, glyphs.length)
+  }
+}