Diff: TFT.cpp

Revision:

0:db0d63650413

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TFT.cpp	Thu Jun 28 10:12:07 2012 +0000
@@ -0,0 +1,400 @@
+#include "TFT.h" 
+#include "shortcuts.h"
+#include "touch.h"
+
+unsigned char DispDir=0;
+
+
+/* ===================================================================
+    routine:    CtrlOutput
+    purpose:    Sets mbed's I/Os to act as RS, RD, RW, CS output
+    parameters: none
+    returns:    nothing    
+    date:       2012-06-27
+    author:     Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void CtrlOutput(void)
+{
+    LPC_GPIO0->FIODIR |= BIT15+BIT16+BIT17+BIT18;
+}
+
+
+/* ===================================================================
+    routine:    PinOutput
+    purpose:    Sets mbed's I/Os to act as 8 bit data output
+    parameters: none
+    returns:    nothing    
+    date:       2012-06-27
+    author:     Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void PinOutput(void)
+{
+    LPC_GPIO0->FIODIR |= BIT0+BIT1;
+    LPC_GPIO2->FIODIR |= BIT0+BIT1+BIT2+BIT3+BIT4+BIT5;    
+}
+
+
+/* ===================================================================
+    routine:    PinInput
+    purpose:    Sets mbed's I/Os to act as 8 bit data input
+    parameters: none
+    returns:    nothing    
+    date:       2012-06-27
+    author:     Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void PinInput(void)
+{
+    LPC_GPIO0->FIODIR &= ~(BIT0+BIT1);
+    LPC_GPIO2->FIODIR &= ~(BIT0+BIT1+BIT2+BIT3+BIT4+BIT5);    
+}
+
+/* ===================================================================
+    routine:    PinLow
+    purpose:    Sets 8 bit data output to 0x00 (all outputs low)
+    parameters: none
+    returns:    nothing    
+    date:       2012-06-27
+    author:     Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void PinLow(void)
+{
+    LPC_GPIO0->FIOCLR = BIT0+BIT1;
+    LPC_GPIO2->FIOCLR = BIT0+BIT1+BIT2+BIT3+BIT4+BIT5;    
+}
+
+/* ===================================================================
+    routine:    PinHigh
+    purpose:    Sets 8 bit data output to 0xff (all outputs high)
+    parameters: none
+    returns:    nothing    
+    date:       2012-06-27
+    author:     Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void PinHigh(void)
+{
+    LPC_GPIO0->FIOSET = BIT0+BIT1;
+    LPC_GPIO2->FIOSET = BIT0+BIT1+BIT2+BIT3+BIT4+BIT5;    
+}
+
+/* ===================================================================
+    routine:    PushData
+    purpose:    Sets the 8 data outputs corresponding to data byte
+                which shall be transmitted to LCD
+    parameters: <data>      byte of data for TX
+    returns:    nothing    
+    date:       2012-06-27
+    author:     Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void PushData(unsigned char data)
+{
+    LPC_GPIO0->FIOCLR = 0x03;                   //set all outputs low
+    LPC_GPIO2->FIOCLR = 0x3f;
+    //as the outputs are not in order and are splittet onto two ports,
+    //the data byte has to be read bit-by-bit and each bit has to set
+    //a different output pin
+    LPC_GPIO0->FIOSET = data&BIT0 | (data&BIT2)>>1;
+    LPC_GPIO2->FIOSET = (data&BIT6) >> 6 | (data&BIT5) >> 4 | (data&BIT7) >> 5 
+                      | (data&BIT4) >> 1 | (data&BIT3) << 1 | (data&BIT1) << 4;                      
+}
+
+/* NOT YET TESTED */
+unsigned char GetData(void)
+{
+    unsigned char data = 0;
+    wait(0.001);
+    data  = (LPC_GPIO0->FIOPIN&BIT0)      | (LPC_GPIO0->FIOPIN&BIT2) >> 1;
+    data |= (LPC_GPIO2->FIOPIN&BIT6) >> 6 | (LPC_GPIO2->FIOPIN&BIT5) >> 4 
+          | (LPC_GPIO2->FIOPIN&BIT7) >> 5 | (LPC_GPIO2->FIOPIN&BIT4) >> 1
+          | (LPC_GPIO2->FIOPIN&BIT3) << 1 | (LPC_GPIO2->FIOPIN&BIT2) << 3;
+    return data;    
+}
+
+/* ===================================================================
+    routine:    SendCommand
+    purpose:    Transmits a command code to the LCD controller
+    parameters: <command>   command byte
+    returns:    nothing        
+    note:       Each transmit to the LCD controller has to be 16 bits
+                wide, which results in 2 bytes per message.
+                Commands are only 8 bits wide, so the upper bits
+                have to be all zero
+    date:       2012-06-27
+    author:     Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void SendCommand(unsigned char command)
+{
+    LPC_GPIO0->FIOCLR = BIT16+BIT18;        //CS and RS low
+    LPC_GPIO0->FIOSET = BIT17+BIT15;        //RD and WR high    
+    LPC_GPIO0->FIOCLR = BIT17;              //WR low
+    PushData(0);                            //commands have only 8 bits
+    LPC_GPIO0->FIOSET = BIT17;              //WR high    
+    for(int x=0; x<3; x++);                 //wait
+    
+    LPC_GPIO0->FIOCLR = BIT17;              //WR low
+    PushData(command);
+    LPC_GPIO0->FIOSET = BIT17;              //WR high
+    LPC_GPIO0->FIOSET = BIT16;              //CS high    
+}
+
+/* ===================================================================
+    routine:    SendData
+    purpose:    Transmits 16 data bits to the LCD controller
+    parameters: <data>   data value
+    returns:    nothing        
+    note:       Transmit has to be splitted into 2 transfers
+                as interface is only 8 bits wide
+    date:       2012-06-27
+    author:     Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void SendData(unsigned int data)
+{
+    LPC_GPIO0->FIOCLR = BIT16;              //CS low
+    LPC_GPIO0->FIOSET = BIT18+BIT15;        //RD and RS high    
+    LPC_GPIO0->FIOCLR = BIT17;              //WR low
+    PushData((data&0xff00)>>8);             //send first byte
+    LPC_GPIO0->FIOSET = BIT17;              //WR high    
+    for(int x=0; x<3; x++);                 //wait
+    
+    LPC_GPIO0->FIOCLR = BIT17;              //WR low
+    PushData(data&0xff);
+    LPC_GPIO0->FIOSET = BIT17;              //WR high
+    LPC_GPIO0->FIOSET = BIT16;              //CS high        
+}
+
+
+/* NOT YET TESTED */
+unsigned int ReadRegister(unsigned int reg)
+{
+    unsigned int data=0;
+    
+    LPC_GPIO0->FIOCLR = BIT16+BIT18;        //CS and RS low
+    LPC_GPIO0->FIOSET = BIT15;              //RD high       
+    PinOutput();
+    LPC_GPIO0->FIOCLR = BIT17;              //WR low
+    PushData(0);
+    LPC_GPIO0->FIOSET = BIT17;              //WR high
+    LPC_GPIO0->FIOCLR = BIT17;              //WR low    
+    PushData(reg);
+    LPC_GPIO0->FIOSET = BIT17;              //WR high
+    PinInput();
+    PinLow();                               /* ?Necessary? */
+    LPC_GPIO0->FIOSET = BIT18;              //RS high
+    LPC_GPIO0->FIOCLR = BIT15;              //RD low 
+    LPC_GPIO0->FIOSET = BIT15;              //RD high
+    data = GetData();
+    LPC_GPIO0->FIOSET = BIT16;              //CS high        
+    PinOutput();
+    return data;    
+}
+
+
+void ClearScreen(unsigned int color)
+{
+   for(unsigned char i=0;i<2;i++)
+    {
+        for(unsigned int f=0;f<38400;f++)
+        {
+            SendData(color);                //black
+        }
+    } 
+}
+
+
+void Init(void)
+{
+    /* PRELOAD TFTData STRUCTURE WITH PRESET/DEFAULT VALUES */    
+    TFTData.XRes    = TFTRESX;                      
+    TFTData.YRes    = TFTRESY;
+    TFTData.Xmin    = 1250;                 //should be calculated
+    TFTData.Xmax    = 2800;                 //for each device!
+    TFTData.Ymin    = 900;
+    TFTData.Ymax    = 3100;
+    TFTData.Xscale  = 6875;
+    TFTData.Yscale  = 6875;
+    DispDir         = LEFT2RIGHT;
+    
+    /* SETUP MBED FOR CONNECTION WITH TFT */
+    CtrlOutput();                           //CS, RD, WR, RS as output
+    PinOutput();                            //8-bit parallel bus
+    PinLow();                               //all output pins are low
+    
+    /* INITIALIZATION SEQUENCE */
+    wait(0.1);        
+    
+    SendCommand(0x0001);
+    SendData(0x0100);
+    SendCommand(0x0002);
+    SendData(0x0700);
+    SendCommand(0x0003);
+    SendData(0x1030);
+    SendCommand(0x0004);
+    SendData(0x0000);
+    SendCommand(0x0008);
+    SendData(0x0302);
+    SendCommand(0x000A);
+    SendData(0x0000);
+    SendCommand(0x000C);
+    SendData(0x0000);
+    SendCommand(0x000D);
+    SendData(0x0000);
+    SendCommand(0x000F);
+    SendData(0x0000);
+    wait(0.100);
+
+    SendCommand(0x0030);
+    SendData(0x0000);
+    SendCommand(0x0031);
+    SendData(0x0405);
+    SendCommand(0x0032);
+    SendData(0x0203);
+    SendCommand(0x0035);
+    SendData(0x0004);
+    SendCommand(0x0036);
+    SendData(0x0B07);
+    SendCommand(0x0037);
+    SendData(0x0000);
+    SendCommand(0x0038);
+    SendData(0x0405);
+    SendCommand(0x0039);
+    SendData(0x0203);
+    SendCommand(0x003c);
+    SendData(0x0004);
+    SendCommand(0x003d);
+    SendData(0x0B07);
+    SendCommand(0x0020);
+    SendData(0x0000);
+    SendCommand(0x0021);
+    SendData(0x0000);
+    SendCommand(0x0050);
+    SendData(0x0000);
+    SendCommand(0x0051);
+    SendData(0x00ef);
+    SendCommand(0x0052);
+    SendData(0x0000);
+    SendCommand(0x0053);
+    SendData(0x013f);
+    wait(0.100);
+
+    SendCommand(0x0060);
+    SendData(0xa700);
+    SendCommand(0x0061);
+    SendData(0x0001);
+    SendCommand(0x0090);
+    SendData(0x003A);
+    SendCommand(0x0095);
+    SendData(0x021E);
+    SendCommand(0x0080);
+    SendData(0x0000);
+    SendCommand(0x0081);
+    SendData(0x0000);
+    SendCommand(0x0082);
+    SendData(0x0000);
+    SendCommand(0x0083);
+    SendData(0x0000);
+    SendCommand(0x0084);
+    SendData(0x0000);
+    SendCommand(0x0085);
+    SendData(0x0000);
+    SendCommand(0x00FF);
+    SendData(0x0001);
+    SendCommand(0x00B0);
+    SendData(0x140D);
+    SendCommand(0x00FF);
+    SendData(0x0000);    
+    wait(0.100);
+    
+    SendCommand(0x0007);
+    SendData(0x0133);
+    
+    /* WAKEUP TFT FROM STANDBY */
+    SendCommand(0x0010);
+    SendData(0x14E0);
+    wait(0.100);
+    
+    SendCommand(0x0007);
+    SendData(0x0133);    
+    SendCommand(0x0022);
+    
+    /* CLS */
+    for(unsigned char i=0;i<2;i++)
+    {
+        for(unsigned int f=0;f<38400;f++)
+        {
+            SendData(0);                //black
+        }
+    }  
+}
+
+
+/* ===================================================================
+    routine:    SetOrientation
+    purpose:    Sets the direction in which the X/Y-position counter
+                autoincrements (used by DrawRectangle)
+    parameters: <layout>   direction control
+    returns:    nothing            
+    date:       2012-06-27
+    author:     Seeed Studio
+    co-author:  Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void SetOrientation(unsigned char layout)
+{
+    SendCommand(0x03);
+    SendData((layout==1)?(0x5038):(0x5030));
+    SendCommand(0x0022);
+}
+
+
+void SetDirection(unsigned char dir)
+{
+    DispDir = dir;
+}
+
+
+/* ===================================================================
+    routine:    SetXY
+    purpose:    Sets virtual "cursor" to specific pixel
+    parameters: <posX, posY> 
+    returns:    nothing            
+    note:       In fact, this tells the LCD controller the next
+                SRAM address to use for the following color value
+    date:       2012-06-27
+    author:     Seeed Studio
+    co-author:  Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void SetXY(unsigned int posX, unsigned int posY)
+{
+    SendCommand(0x20);        //set X
+    SendData(posX);
+    SendCommand(0x21);        //set Y
+    SendData(posY);
+    SendCommand(0x22);        //start command for writing into display SRAM
+}
+
+
+/* ===================================================================
+    routine:    SetPixel
+    purpose:    Colors a single pixel
+    parameters: <posX, posY, color> 
+    returns:    nothing            
+    note:       The most basic function for displaying content onto
+                the TFT display    
+    date:       2012-06-27
+    author:     Seeed Studio
+    co-author:  Stefan Guenther
+                Elektronikladen | ELMICRO
+  -------------------------------------------------------------------*/
+void SetPixel(unsigned int posX, unsigned int posY, unsigned int color)
+{
+    SetXY(posX, posY);
+    SendData(color);
+}