Share My Creation TFT Timer

The code doesn't use any library, the SPI is set by inline C. There are functions for initializing ST7735 1.8'' module, displaying characters and part of universal 5x7 fonts for 0 to 9 only, letters can be added if needed. The code works only for ATMEGA328, I used Arduino Nano.

'   TFT module with ST7735 driver
'   1 LED   3.3 V or 5V via 47 ohm
'   2 SCK   13
'   3 SDA   11
'   4 A0 Or DC  9
'   5 RESET   8
'   6 CS  10
'   7 GND   GND
'   8 VCC   5 V

Sub Process_Globals

    Public Serial1 As Serial
    Private tmr As Timer
    Public CS As Pin
    Public DC As Pin
    Public SDA As Pin
    Public SCK As Pin
    Public RST As Pin
    Public  BLACK   As UInt=0x0000
    Public  BLUE  As UInt=0x01F
    Public  RED   As UInt=0xF800
    Public  GREEN   As UInt=0x07E0
    Public  CYAN   As UInt=0x07FF
    Public  MAGENTA   As UInt=0xF81F
    Public  YELLOW   As UInt=0xFFE0
    Public  WHITE   As UInt=0xFFFF
    Private spires, spidata As Byte  
    Private d(5) As Byte
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    tmr.Initialize("tmr_Tick", 1000)
    tmr.Enabled = True
    CS.Initialize(10, CS.MODE_OUTPUT)
    DC.Initialize(9, DC.MODE_OUTPUT)
    SCK.Initialize(13, SCK.MODE_OUTPUT)
    RST.Initialize(8, RST.MODE_OUTPUT)
    SDA.Initialize(11, SDA.MODE_OUTPUT)
   
    RunNative ("set_spi",Null)
    TFTinit
    rectan(0,0,159,127,WHITE)

    rectan(100,70,104,74,BLUE)
    rectan(100,56,104,60,BLUE)
    rectan(35,70,39,74,BLUE)
    rectan(35,56,39,60,BLUE)

End Sub

Sub tmr_Tick  

    d(0)=d(0)+1
    If d(0)>9 Then
        d(0)=0
        d(1)=d(1)+1
    End If
    If d(1)>5 Then
        d(1)=0
        d(2)=d(2)+1
    End If
    If d(2)>9 Then
        d(2)=0
        d(3)=d(3)+1
    End If
    If d(3)>5 Then
        d(3)=0
        d(4)=d(4)+1
    End If
    If d(4)>9 Then
        d(4)=0
    End If

    rectan(135,50,160,80,WHITE)
    drawC(135,50,d(0),RED,4)

    rectan(110,50,135,80,WHITE)
    drawC(110,50,d(1),RED,4)
   
    rectan(70,50,95,80,WHITE)
    drawC(70,50,d(2),RED,4)
   
    rectan(45,50,70,80,WHITE)
    drawC(45,50,d(3),RED,4)
   
    rectan(5,50,30,80,WHITE)
    drawC(5,50,d(4),RED,4)
   
End Sub

Sub drawC(x As Byte, y As Byte, c As Byte, color As UInt, size As Byte)
    Dim i, j, line As Byte
    Dim font() As Byte = Array As Byte(0x3E, 0x41, 0x41, 0x41, 0x3E, 0x00, 0x42, 0x7F, 0x40, 0x00, 0x72, 0x49, 0x49, 0x49, 0x46, 0x21, 0x41, 0x49, 0x4D, 0x33,0x18, 0x14, 0x12, 0x7F, 0x10,0x27, 0x45, 0x45, 0x45, 0x39,0x3C, 0x4A, 0x49, 0x49, 0x31,0x41, 0x21, 0x11, 0x09, 0x07,0x36, 0x49, 0x49, 0x49, 0x36,0x46, 0x49, 0x49, 0x29, 0x1E )
  For i=0 To 5
    If i = 5 Then
      line = 0
    Else
      line = font((c*5)+i)
        For j = 0 To 7
              If (line Mod 2)=1 Then
                    If size = 1 Then
                      pixel(x+i, y+j, color)
                    Else  
                      rectan(x+(i*size), y+(j*size), x+(i*size)+size, y+(j*size)+size, color)
                    End If
              End If
          line = line / 2
        Next
    End If
  Next
End Sub

Sub spi(data As Byte)    'send byte over spi
    spidata=data
    RunNative ("spi",Null)
    Return
End Sub


Sub command(cmd As Byte)
    DC.DigitalWrite(False)    'command Mode
    CS.DigitalWrite(False)    'Select the LCD (active low)
      spi(cmd)'set up data on bus
      CS.DigitalWrite(True)    'Deselect LCD (active low)  
End Sub

Sub send_data(data As Byte)
    DC.DigitalWrite(True)    'data mode
    CS.DigitalWrite(False)    'Select the LCD (active low)
    spi(data)    'set up data on bus
    CS.DigitalWrite(True)    'Deselect LCD (active low)
End Sub

Sub TFTinit
      Dim i As Byte
   
    RST.DigitalWrite(True)    'hardware reset
    Delay(200)
    RST.DigitalWrite(False)
    Delay(10)
    RST.DigitalWrite(True)
    Delay(10)

      command(0x01)    'sw reset
    Delay(200)
     command(0x11)    ' Sleep out
    Delay(200)
   
      command(0x3A)    'color mode
    send_data(0x05)    '16 bits

      command(0x36)    'Memory access ctrl (directions)
      send_data(0x60)    '0B1100000
      'command(0x21)    'color inversion on

      command(0x2D)    'color look up table
      send_data(0)
    For i = 1 To 31
        send_data(i * 2)
    Next

      For i = 0 To 63
        send_data(i)
      Next
      send_data(0)
    For i = 1 To 31
    send_data(i * 2)
    Next

      command(0x13)    'Normal display on
    command(0x29)    'Main screen turn on
End Sub

Sub area(x0 As Byte, y0 As Byte,  x1 As Byte, y1 As Byte)
  command(0x2A)    'Column addr set
  send_data(0x00)
  send_data(x0)    ' XSTART
  send_data(0x00)
  send_data(x1)    ' XEND

  command(0x2B)    'Row addr set
  send_data(0x00)
  send_data(y0)    ' YSTART
  send_data(0x00)
  send_data(y1)    ' YEND

  command(0x2C)    'write To RAM
End Sub
 
Sub rectan(x0 As Byte, y0 As Byte,  x1 As Byte, y1 As Byte, color As UInt)
  Dim i As Int
  area(x0,y0,x1,y1)
  For i=(y1 - y0 + 1) * (x1 - x0 + 1) To 0 Step -1  

     DC.DigitalWrite(True)    ' data mode
    CS.DigitalWrite(False)
    spi(color / 256)
    spi(color Mod 256)
    CS.DigitalWrite(True)
   Next
End Sub

Sub pixel(x As Byte, y As Byte, color As UInt)
    area(x,y,x+1,y+1)
    send_data(color / 256)
    send_data(color Mod 256)
End Sub


    #if C
    void spi(B4R::Object* o)
    {  

      SPDR = b4r_main::_spidata;  // Start transmission
      while (!(SPSR & _BV(SPIF)));  // Wait For transmission To complete
      //Return SPDR;    // received byte
      b4r_main::_spires = SPDR;
    }

    #End if
   
    #if C
    void set_spi(B4R::Object* o)
    {  
      SPCR = 0B1011101;  // Enable SPI, Master, mode3, set clock rate fck/16
      SPSR = 1;    //set clock rate fck/2=2MHz
    }
    #End if