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@yamori813(もり や)

pcDuinoに激安液晶を接続してみた

Last updated at Posted at 2019-04-12

後日追記：この液晶は壊れてしまいました。

pcDuinoのピンヘッダーはこんなになっていて、以前aitendoで購入した激安液晶を接続してみました。

J11

PIN CON NO LCD dts 変更
UART2_RX PI19 172 D8 8 19 CS
UART2_TX PI18 171 D9 8 18 RD
GPIO2 PH7 132 D10 7 7 D8
PWM0 PH6 131 D11 7 6 WR
GPIO3 PH8 133 D12 7 8 D9
PWM1 PB2 20 D13 1 2 RST
PWM2 PI3 156 D14 8 3 RS
GPIO4 PH9 134 D15 7 9 D10

J8

PIN CON NO LCD dts 変更
GPIO5 PH10 135 RST 7 10 D11
PWM3 PH5 130 D_RQ
SPI0_CS PI10 163 D_CD
SPI0_MOSI PI12 165 D_IN
SPI0_MISO PI13 166 D_OUT
SPI0_CLK PI11 164 D_CLK
GND
ARef
TWI2-SDA PB21 39
TWI2-SCK PB20 38

J11

PIN CON NO LCD dts 変更
GPIO6 PH11 136 RS 7 11 D12
GPIO7 PH12 137 WR 7 12 D13
GPIO8 PH13 138 RD 7 13 D14
GPIO9 PH14 139 CS 7 14 D15

mrubyで確認してみます。mruby-bsdgpioを使っています。

#
# original is LCD_ID_readreg.ino
#

LCD_RST = 135
LCD_CS = 139
LCD_RS = 136
LCD_WR = 137
LCD_RD = 138

LCD_D8 = 172
LCD_D9 = 171
LCD_D10 = 132
LCD_D11 = 131
LCD_D12 = 133
LCD_D13 = 20
LCD_D14 = 156
LCD_D15 = 134

LOW = 0
HIGH = 1

def lcdSetWriteDir(g)
  g.setflags(LCD_D8, BsdGpio::OUTPUT)
  g.setflags(LCD_D9, BsdGpio::OUTPUT)
  g.setflags(LCD_D10, BsdGpio::OUTPUT)
  g.setflags(LCD_D11, BsdGpio::OUTPUT)
  g.setflags(LCD_D12, BsdGpio::OUTPUT)
  g.setflags(LCD_D13, BsdGpio::OUTPUT)
  g.setflags(LCD_D14, BsdGpio::OUTPUT)
  g.setflags(LCD_D15, BsdGpio::OUTPUT)
end

def lcdSetReadDir(g)
  g.setflags(LCD_D8, BsdGpio::INPUT)
  g.setflags(LCD_D9, BsdGpio::INPUT)
  g.setflags(LCD_D10, BsdGpio::INPUT)
  g.setflags(LCD_D11, BsdGpio::INPUT)
  g.setflags(LCD_D12, BsdGpio::INPUT)
  g.setflags(LCD_D13, BsdGpio::INPUT)
  g.setflags(LCD_D14, BsdGpio::INPUT)
  g.setflags(LCD_D15, BsdGpio::INPUT)
end

def lcdWrite8(g, data)
  g.set(LCD_D8, data & 1)
  g.set(LCD_D9, (data & 2) >> 1)
  g.set(LCD_D10, (data & 4) >> 2)
  g.set(LCD_D11, (data & 8) >> 3)
  g.set(LCD_D12, (data & 16) >> 4)
  g.set(LCD_D13, (data & 32) >> 5)
  g.set(LCD_D14, (data & 64) >> 6)
  g.set(LCD_D15, (data & 128) >> 7)
end

def lcdRead8(g)
  result = g.get(LCD_D15)
  result =  result << 1
  result = result | g.get(LCD_D14)
  result =  result << 1
  result = result | g.get(LCD_D13)
  result =  result << 1
  result = result | g.get(LCD_D12)
  result =  result << 1
  result = result | g.get(LCD_D11)
  result =  result << 1
  result = result | g.get(LCD_D10)
  result =  result << 1
  result = result | g.get(LCD_D9)
  result =  result << 1
  result = result | g.get(LCD_D8)
  return result
end

def lcdReadData8(g)
  lcdSetReadDir(g)
  g.set(LCD_CS, LOW)
  g.set(LCD_RS, HIGH)
  g.set(LCD_RD, HIGH)
  g.set(LCD_WR, HIGH)

  g.set(LCD_RD, LOW)
  usleep(10*1000)
  result = lcdRead8(g)
  g.set(LCD_RD, HIGH)

  usleep(10*1000)
  return result

end

def lcdWriteData(g, data)
  lcdSetWriteDir(g)
  g.set(LCD_CS, LOW)
  g.set(LCD_RS, HIGH)
  g.set(LCD_RD, HIGH)
  g.set(LCD_WR, HIGH)

  lcdWrite8(g, data >> 8)

  g.set(LCD_WR, LOW)
  usleep 10*1000
  g.set(LCD_WR, HIGH)

  lcdWrite8(g, data & 0xff)

  g.set(LCD_WR, LOW)
  usleep 10*1000
  g.set(LCD_WR, HIGH)

  g.set(LCD_CS, HIGH)
end

def lcdWriteCommand(g, command)
  lcdSetWriteDir(g)
  g.set(LCD_CS, LOW)
  g.set(LCD_RS, LOW)
  g.set(LCD_RD, HIGH)
  g.set(LCD_WR, HIGH)
  lcdWrite8(g, command >> 8)
  g.set(LCD_WR, LOW)
  usleep 10*1000
  g.set(LCD_WR, HIGH)
  lcdWrite8(g, command & 0xff)
  g.set(LCD_WR, LOW)
  usleep 10*1000
  g.set(LCD_WR, HIGH)
  g.set(LCD_CS, HIGH)
end

def lcdReset(g)
  g.set(LCD_RST, LOW)
  sleep 1
  g.set(LCD_RST, HIGH)
  sleep 1
end

def lcdInit(g)
  g.setflags(LCD_CS, BsdGpio::OUTPUT)
  g.set(LCD_CS, HIGH)
  g.setflags(LCD_RS, BsdGpio::OUTPUT)
  g.set(LCD_RS, HIGH)
  g.setflags(LCD_WR, BsdGpio::OUTPUT)
  g.set(LCD_WR, HIGH)
  g.setflags(LCD_RD, BsdGpio::OUTPUT)
  g.set(LCD_RD, HIGH)
  g.setflags(LCD_RST, BsdGpio::OUTPUT)
  g.set(LCD_RST, HIGH)
end

def readReg(g, reg, n, str)
  print "reg(" + reg.to_s + ") "
  lcdReset(g)
  lcdSetWriteDir(g)
  lcdWriteCommand(g, 0xB0)
  lcdWriteData(g, 0x00)
  lcdWriteCommand(g, reg)
  lcdSetReadDir(g)
  n.times {
    v = lcdReadData8(g)
    print v.to_s(16) + " "
  }
  lcdSetWriteDir(g)
  print "  " + str + "¥n"
end

g = BsdGpio.new(0)
lcdInit(g)
readReg(g, 0x00, 2, "ID: ILI9320, ILI9325, ILI9335, ...")

実行結果

# /usr/local/bin/mruby LCD_ID_readreg.rb
reg(0) 93 25   ID: ILI9320, ILI9325, ILI9335, ...

HardwareがらみのHackの一歩目はデバイスの認識です。

こちらのコードを参考にして表示を試してみました。

写真（2019-04-14 17.20）.jpg

とっても遅いです。

上記のコードをベースにcairoでも書いてみました。

def lcdWriteRegisterWord(g, addr, data)
  lcdWriteCommand(g, addr)
  lcdWriteData(g, data)
end

def lcdSetup(g)
  lcdWriteRegisterWord(g,0x00e5,0x8000)
  lcdWriteRegisterWord(g,0x0000,0x0001)
  lcdWriteRegisterWord(g,0x0001,0x0100)
  lcdWriteRegisterWord(g,0x0002,0x0700)
  lcdWriteRegisterWord(g,0x0003,0x1030)
  lcdWriteRegisterWord(g,0x0004,0x0000)
  lcdWriteRegisterWord(g,0x0008,0x0202)
  lcdWriteRegisterWord(g,0x0009,0x0000)
  lcdWriteRegisterWord(g,0x000a,0x0000)
  lcdWriteRegisterWord(g,0x000c,0x0000)
  lcdWriteRegisterWord(g,0x000d,0x0000)
  lcdWriteRegisterWord(g,0x000f,0x0000)
  lcdWriteRegisterWord(g,0x0010,0x0000)
  lcdWriteRegisterWord(g,0x0011,0x0000)
  lcdWriteRegisterWord(g,0x0012,0x0000)
  lcdWriteRegisterWord(g,0x0013,0x0000)
  lcdWriteRegisterWord(g,0x0010,0x17b0)
  lcdWriteRegisterWord(g,0x0011,0x0037)
  lcdWriteRegisterWord(g,0x0012,0x0138)
  lcdWriteRegisterWord(g,0x0013,0x1700)
  lcdWriteRegisterWord(g,0x0029,0x000d)
  lcdWriteRegisterWord(g,0x0020,0x0000)
  lcdWriteRegisterWord(g,0x0021,0x0000)
  lcdWriteRegisterWord(g,0x0030,0x0001)
  lcdWriteRegisterWord(g,0x0031,0x0606)
  lcdWriteRegisterWord(g,0x0032,0x0304)
  lcdWriteRegisterWord(g,0x0033,0x0202)
  lcdWriteRegisterWord(g,0x0034,0x0202)
  lcdWriteRegisterWord(g,0x0035,0x0103)
  lcdWriteRegisterWord(g,0x0036,0x011d)
  lcdWriteRegisterWord(g,0x0037,0x0404)
  lcdWriteRegisterWord(g,0x0038,0x0404)
  lcdWriteRegisterWord(g,0x0039,0x0404)
  lcdWriteRegisterWord(g,0x003c,0x0700)
  lcdWriteRegisterWord(g,0x003d,0x0a1f)
  lcdWriteRegisterWord(g,0x0050,0x0000)
  lcdWriteRegisterWord(g,0x0051,0x00ef)
  lcdWriteRegisterWord(g,0x0052,0x0000)
  lcdWriteRegisterWord(g,0x0053,0x013f)
  lcdWriteRegisterWord(g,0x0060,0x2700)
  lcdWriteRegisterWord(g,0x0061,0x0001)
  lcdWriteRegisterWord(g,0x006a,0x0000)
  lcdWriteRegisterWord(g,0x0090,0x0010)
  lcdWriteRegisterWord(g,0x0092,0x0000)
  lcdWriteRegisterWord(g,0x0093,0x0003)
  lcdWriteRegisterWord(g,0x0095,0x0101)
  lcdWriteRegisterWord(g,0x0097,0x0000)
  lcdWriteRegisterWord(g,0x0098,0x0000)
  lcdWriteRegisterWord(g,0x0007,0x0021)
  lcdWriteRegisterWord(g,0x0007,0x0031)
  lcdWriteRegisterWord(g,0x0007,0x0173)
end

def lcdDrawPixel(g, x, y, color)
  lcdWriteRegisterWord(g, 0x0020, x)
  lcdWriteRegisterWord(g, 0x0021, y)
  lcdWriteRegisterWord(g, 0x0022, color)
end

def rgb565_conv(r, g, b)
  rr = (r >> 3) << 11
  gg = (g >> 2) << 5
  bb = (b >> 3)
  return rr | gg | bb
end

def lcdCopy(g, c)
  for i in 1..320 do
    rgba = c.getpix(0, i - 1, 240)
    for n in 1..240 do
      color = rgb565_conv(rgba[2 + (n - 1) * 4], rgba[1 + (n - 1) * 4],
        rgba[0 + (n - 1) * 4])
      lcdDrawPixel(g, n - 1, i - 1, color)
    end
  end
end

g = BsdGpio.new(0)
lcdInit(g)
lcdReset(g)
lcdSetup(g)

c = Cairo.new(240, 320)
c.set_source_rgb(1 , 0, 0)
c.move_to(0, 0)
c.line_to(100, 100)
c.stroke()

lcdCopy(g, c)

lcdCopyのコードはAtheros(MIPS)で使っていたコードを参考にしたが、AtherosはBigendianなのでrbgaの並びが逆でした。

写真（2019-04-15 17.13） #2.jpg

なぜか白いままで表示できなくなってしまいました。初期化をいろいろためしたのですがダメでした。IDは拾えるのでパネルが壊れてしまったのかな。。。

突然復活しました。またおかしくなるのかもしれません。(2019/09/30)

どうも起動時に負荷の重い状態で初期化をするとパネルがハングアップしてしまうような感じのようです。

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