thata

#define sclk 9
#define mosi 10
#define rst  11
#define dc   12
#define cs   13

void initSPI() {
  // Init basic control pins common to all connection types
  pinMode(cs, OUTPUT);
  digitalWrite(cs, HIGH); // deselect（データ送信の時だけ select = LOW にする）

thata

4649

thata

# 例のJavaのコードをRubyへ移植
#
# usage: echo "3\nfoo foo\nbar ber\nbuzz buzzz" | ruby main.rb
#        #=> 3

# 渡された二つの文字列の差異の数を返す
def num_of_difference(word1, word2)
  return word1.size if word1.size != word2.size

  pairs = word1.split(//).zip(word2.split(//))

thata

Common subdirectories: min-caml-ppc/.git and min-caml-x86/.git
Common subdirectories: min-caml-ppc/PowerPC and min-caml-x86/PowerPC
Common subdirectories: min-caml-ppc/SPARC and min-caml-x86/SPARC
diff min-caml-ppc/asm.ml min-caml-x86/asm.ml
1c1
< (* PowerPC assembly with a few virtual instructions *)
---
> (* 2オペランドではなく3オペランドのx86アセンブリもどき *)
9,10c9
<   | Li of int

thata

  def test_jalr
    cpu = Cpu.new

    # XXX: 行き当たりばったりに書いたのでゴチャゴチャしてる...
    rom = [
      _addi(2, 0, 40),  # x2 = foo
      _jalr(1, 2, 0),   # call foo （ t=pc+4; pc=(x2+0) & ~1; x1=t ）
      _add(31, 29, 30), # x31 = x29 + x30
      _nop,
      _jalr(1, 31, -5), # call bar （ t=pc+4; pc=(x31-5)&~1）; x1=t ）

thata

# RISC-V subset simulator
# usage:
#   ruby rv32sim.rb sample/fibonacci.rom

class Memory
  WORD_SIZE = 4

  attr_accessor :data

  def initialize(data = "\0" * 512)

thata

# hello
#
# $ riscv64-unknown-elf-gcc -march=rv32i -mabi=ilp32 -Wl,-Ttext=0x00 -nostdlib -o hello.elf hello.S
# $ riscv64-unknown-elf-objcopy -O binary hello.elf hello.rom
# $ ruby rv32sim.rb hello.rom

  .text
  .globl _start
  .type _start, @function
_start:

thata

# fibonacci for RV32
#
# $ riscv64-unknown-elf-gcc -march=rv32i -mabi=ilp32 -Wl,-Ttext=0x00 -nostdlib -o fibonacci fibonacci.S
# $ riscv64-unknown-elf-objcopy -O binary fibonacci fibonacci.rom
# $ ruby rv32sim.rb fibonacci.rom

  .text
  .globl _start
  .type _start, @function
_start:

thata

# fibonacci for RV32
#
# $ riscv64-unknown-elf-gcc -march=rv32i -mabi=ilp32 -Wl,-Ttext=0x00 -nostdlib -o fibonacci fibonacci.s
# $ riscv64-unknown-elf-objcopy -O binary fibonacci fibonacci.rom
# $ ruby rv32sim.rb fibonacci.rom

  .text
  .globl _start
  .type _start, @function
_start:

thata

require "./rv32sim"

def _add(rd, rs1, rs2)
  0b0110011 |
    (rd << 7) |
    (0x0 << 12) |
    (rs1 << 15) |
    (rs2 << 20) |
    (0x00 << 25)
end