I'm trying to make my own version of the KS0108 driver/library included with swordfish. I've read that storing a copy of what is on the display in the PIC's memory helps to increase the speed at which you can read the data (and therefore draw text, rectangles, etc) to the display.
I took the original driver, and modified some parts of it so that all other functions in the driver called the "WriteByte" and "ReadByte" functions. I then tested this driver, and everything works OK.
I added a 1024 byte array, which will keep a copy of the display's data. (128 x 64 pixels / 8 pixels per byte = 1024 bytes).
I then modified the WriteByte function so that it also writes to this array (index is calculated by "(Pos.y * 128) + Pos.x" ). The readbyte function was modified so that instead of reading data from the display, it would read from the array. The Clear Screen function was also changed so that the entire array is zero'd.
The problem is this:
When I write a string to the display from my main program using "WriteStr", only the first character of that string gets printed on the screen.
I've narrowed down the problem to the modification which I made to the writebyte function. It seems that the line "DisplayData(index) = pvalue" in the WriteByte function is causing the problem.
(whole function below:)
Code: Select all
Public Sub WriteByte(pValue As Byte)
Dim index As Word
SetPosition
SetData(pValue)
index = (Pos.y * 128) + Pos.x
If (index < 1023) Then
DisplayData(index) = pvalue
EndIf
End Sub The entire driver's code which is having problems is below:
Code: Select all
{
****************************************************************
* Name : KS0108.BAS *
* Author : David John Barker *
* Notice : Copyright (c) 2006 Mecanique *
* : All Rights Reserved *
* Date : 02/05/2006 *
* Version : 1.0 *
* Notes : *
* : *
****************************************************************
}
Module KS0108
// import the graphics module...
#define GLCD_PIXEL_01
#define GLCD_COLOR_01
#define GLCD_XY_08
Include "Graphics.bas"
Include "system.bas"
// default module options - user options can override these values...
#option GLCD_DATA = PORTD // data port
#option GLCD_RS = PORTC.1 // RS pin
#option GLCD_EN = PORTE.0 // EN pin
#option GLCD_RW = PORTC.0 // RW pin
#option GLCD_CS1 = PORTE.1 // chip select
#option GLCD_CS2 = PORTE.2 // chip select
#option GLCD_ASPECT_RATIO = 75 // aspect ratio, smaller number will squeeze y for GLCD circles and box
#option GLCD_INIT_DELAY = 100 // initialisation delay (ms)
#option GLCD_INVERT_CS = false // invert CS lines...
// validate data port...
#if IsOption(GLCD_DATA)
#if Not IsValidPort(GLCD_DATA)
#error GLCD_DATA, "Invalid option. DATA must be a valid port name."
#endif
#ifdef GLCD_DATA@ Then
#error GLCD_DATA@, "Invalid option. DATA port cannot be a single bit value."
#endif
#endif
// validate RS pin...
#if IsOption(GLCD_RS) And Not IsValidPortPin(GLCD_RS)
#error GLCD_RS, "Invalid option. RS must be a valid port pin."
#endif
// validate EN pin...
#if IsOption(GLCD_EN) And Not IsValidPortPin(GLCD_EN)
#error GLCD_EN, "Invalid option. EN must be a valid port pin."
#endif
// validate RW pin...
#if IsOption(GLCD_RW) And Not IsValidPortPin(GLCD_RW)
#error GLCD_RW, "Invalid option. RW must be a valid port pin."
#endif
// validate CS1 pin...
#if IsOption(GLCD_CS1) And Not IsValidPortPin(GLCD_CS1)
#error GLCD_CS1, "Invalid option. CS1 must be a valid port pin."
#endif
// validate CS2 pin...
#if IsOption(GLCD_CS2) And Not IsValidPortPin(GLCD_CS2)
#error GLCD_CS2, "Invalid option. CS2 must be a valid port pin."
#endif
// validate initialisation delay...
#if IsOption(GLCD_INIT_DELAY)
#if Not (GLCD_INIT_DELAY in (0 to 1000))
#error GLCD_INIT_DELAY, "Invalid option. GLCD initialize delay must be between 0 and 1000 (ms)."
#endif
#endif
// validate invert CS...
#if IsOption(GLCD_INVERT_CS)
#if Not (GLCD_INVERT_CS in (true, false))
#error GLCD_INVERT_CS, "Invalid option. GLCD invert CS must be true or false."
#endif
#endif
// validate RST pin...
#if IsOption(GLCD_RST) And Not IsValidPortPin(GLCD_RST)
#error GLCD_RST, "Invalid option. RST must be a valid port pin."
#endif
// now create Data TRIS...
#option _GLCD_DATA_TRIS = GetTRIS(GLCD_DATA)
// GLCD width and height...
Public Const
GLCDWidth = 128,
GLCDHeight = 64
// x, y position...
Public Dim
Pos As TPosition
// KS0108 commands...
Const
cmdOn = $3F,
cmdOff = $3E,
cmdPage = $B8,
cmdColumn = $40,
cmdRam = $C0,
GLCDDelay = GLCD_INIT_DELAY
// port and pin settings, these are brought into
// the program by using the above options...
Dim
DATA As GLCD_DATA, // data in (PORT)
TRISData As _GLCD_DATA_TRIS, // data TRIS
RS As GLCD_RS.GLCD_RS@, // RS pin (instruction or data)
EN As GLCD_EN.GLCD_EN@, // EN pin
RW As GLCD_RW.GLCD_RW@, // RW pin (read or write)
CS1 As GLCD_CS1.GLCD_CS1@, // chip1 select
CS2 As GLCD_CS2.GLCD_CS2@ // chip2 select
#if IsOption(GLCD_RST)
Dim
RST As GLCD_RST.GLCD_RST@ // RST pin
#endif
Dim DisplayData(1024) As Byte
{
****************************************************************************
* Name : CheckPage (PRIVATE) *
* Purpose : Toggles between left and right half of GLCD *
****************************************************************************
}
Sub CheckPage()
#if GLCD_INVERT_CS
If Pos.x < 64 Then
CS1 = 1
CS2 = 0
Else
CS1 = 0
CS2 = 1
EndIf
#else
If Pos.x < 64 Then
CS1 = 0
CS2 = 1
Else
CS1 = 1
CS2 = 0
EndIf
#endif
End Sub
{
****************************************************************************
* Name : StrobeEN (PRIVATE) *
* Purpose : Strobe the GLCD EN pin *
****************************************************************************
}
Inline Sub StrobeEN()
EN = 1
DelayUS(1)
EN = 0
End Sub
{
****************************************************************************
* Name : GLCDData (PRIVATE) *
* Purpose : Switch to GLCD data mode *
****************************************************************************
}
Inline Sub GLCDData()
RS = 1
End Sub
{
****************************************************************************
* Name : GLCDInst (PRIVATE) *
* Purpose : Switch to GLCD instruction mode *
****************************************************************************
}
Inline Sub GLCDInst()
RS = 0
End Sub
{
****************************************************************************
* Name : GLCDRead (PRIVATE) *
* Purpose : Set GLCD to read mode *
****************************************************************************
}
Inline Sub GLCDRead()
RW = 1
End Sub
{
****************************************************************************
* Name : GLCDWrite (PRIVATE) *
* Purpose : Set GLCD to write mode *
****************************************************************************
}
Inline Sub GLCDWrite()
RW = 0
End Sub
{
****************************************************************************
* Name : WaitForIdle (PRIVATE) *
* Purpose : Block further GLCD access until signalled ready. *
****************************************************************************
}
Sub WaitForIdle()
Dim Timeout As Byte
Timeout = $FF
GLCDInst // instruction data
GLCDRead // read mode
TRISData = $FF // set data bus to input
Repeat
ClrWDT
StrobeEN
Dec(Timeout)
Until (DATA.7 = 0) Or (Timeout = 0)
End Sub
{
****************************************************************************
* Name : SetData (PRIVATE) *
* Purpose : Write a data byte to GLCD *
****************************************************************************
}
Sub SetData(pData As Byte)
WaitForIdle // block until not busy
GLCDData // access display RAM data
GLCDWrite // write mode
TRISData = $00 // set data bus to output
DATA = pData // write to the bus
StrobeEN // write to GLCD
End Sub
{
****************************************************************************
* Name : GetData (PRIVATE) *
* Purpose : Read byte from GLCD *
****************************************************************************
}
Function GetData() As Byte
WaitForIdle // block until not busy
TRISData = $FF // set data bus to input
GLCDData // access display RAM data
GLCDRead // read mode
StrobeEN // latch data
Result = DATA // get the data
End Function
{
****************************************************************************
* Name : Command (PRIVATE) *
* Purpose : Write a command byte to GLCD *
****************************************************************************
}
Sub Command(pCommand As Byte)
WaitForIdle // block until not busy
GLCDInst // instruction mode
GLCDWrite // write mode
TRISData = $00 // set data bus to output
DATA = pCommand // write to the bus
StrobeEN // write to GLCD
End Sub
{
****************************************************************************
* Name : SetPosition (PRIVATE) *
* Purpose : Set GLCD x and y positions *
****************************************************************************
}
Sub SetPosition()
CheckPage // set correct page
Command(cmdColumn Or Pos.x) // set x position
Command(cmdPage Or Pos.y) // set y position
End Sub
{
****************************************************************************
* Name : WriteByte *
* Purpose : Write a byte at x, page *
****************************************************************************
}
Public Sub WriteByte(pValue As Byte)
Dim index As Word
SetPosition
SetData(pValue)
index = (Pos.y * 128) + Pos.x
If (index < 1023) Then
DisplayData(index) = pvalue
EndIf
End Sub
{
****************************************************************************
* Name : ReadByte *
* Purpose : Read a byte at x, page *
****************************************************************************
}
Public Function ReadByte() As Byte
SetPosition
GetData
Result = GetData
//Result = DisplayData((Pos.y * 128) + Pos.x)
End Function
{
****************************************************************************
* Name : SetPixel *
* Purpose : Set pixel at pixel location x,y *
****************************************************************************
}
Public Sub SetPixel(pX, pY As Byte)
Dim YBit As Byte
Dim Pixel As Byte
If (pX < GLCDWidth) And (pY < GLCDHeight) Then
YBit = 1 << (pY Mod 8)
Pos.y = pY / 8
Pos.x = pX
//SetPosition
//GetData
Pixel = ReadByte() //GetData
// pen is white...
If Pen.Color = 0 Then
If Pen.Mode = pmCopy Then
yBit = Not yBit
Pixel = Pixel And YBit
EndIf
// pen is black...
Else
// pen copy or merge...
If Pen.Mode <> pmXOR Then
Pixel = Pixel Or yBit
// pen XOR
Else
If (Pixel And YBit) = 0 Then
Pixel = Pixel Or yBit
Else
yBit = Not yBit
Pixel = Pixel And YBit
EndIf
EndIf
EndIf
WriteByte(pixel)
EndIf
End Sub
{
****************************************************************************
* Name : GetPixel *
* Purpose : Return pixel colour at pixel position x, y *
****************************************************************************
}
Public Function GetPixel(pX, pY As Byte) As TColor
Dim Pixel As Byte
Pos.y = pY / 8
Pos.x = pX
//SetPosition
//GetData
Pixel = ReadByte() >> (pY Mod 8)
Result = Pixel.0
End Function
{
****************************************************************************
* Name : Cls *
* Purpose : Clear the GLCD screen *
****************************************************************************
}
Public Sub Cls()
Dim x, y As Byte
Dim index As Word
// enable both displays...
#if GLCD_INVERT_CS
CS1 = 1
CS2 = 1
#else
CS1 = 0
CS2 = 0
#endif
Command(cmdOff)
y = 0
Repeat
Command(cmdPage Or y)
x = 0
Repeat
Command(cmdColumn Or x)
SetData($00)
Inc(x)
Until x > 63
Inc(y)
Until y > 7
Command(cmdRam)
Command(cmdOn)
For index = 0 To Bound(DisplayData)
DisplayData(index) = $00
Next
End Sub
{
****************************************************************************
* Name : Initialize *
* Purpose : Configure the GLCD before use *
****************************************************************************
}
Sub Initialize()
#if IsOption(GLCD_RST)
Output(RST)
RST = 1
#endif
Pos.x = 0
Pos.y = 0
DelayMS(GLCDDelay) // start up delay, allow GLCD to settle
Output(EN) // enable is low
Output(RS) // data or instruction is low (command mode)
Output(RW) // read/write is low
Output(CS1) // screen (1)
Output(CS2) // screen (2)
Command(cmdRam)
Command(cmdOn)
End Sub
// configure the module
Initialize