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Microchip Graphics Library Integration
Here is some code for the eBay HX8347-A LCD I’ve been dinking with that utilizes the Graphics Library provided by Microchip. They have a few nice app notes on creating the graphical widgets on one of their development boards, but not really for a custom setup like my Commander32. All of their microcontrollers use the PMP feature to communicate with the LCD, while I just use pins directly. Their help file gives a nice summary of copying the library files to a new project to keep the file structure intact. Once that is done, the following steps should help make your own setup.
Title Screen for GUI demo
Main Menu with images.
Button pressed on Main Menu.
- Write a new HardwareProfile.h
Write from scratch to contain the definition of the LCD pins to the microcontroller pins and the clock frequency define for SYS_FREQ (required for library). This goes in source folder with your main.c file.
#define SYS_FREQ (80000000) // Definitions for reset pin #define RST_TRIS_BIT TRISGbits.TRISG12 #define RST_LAT_BIT LATGbits.LATG12 #define LCD_REST RST_LAT_BIT // Definitions for CS pin #define CS_TRIS_BIT TRISGbits.TRISG13 #define CS_LAT_BIT LATGbits.LATG13 #define LCD_CS CS_LAT_BIT // Definitions for RS pin #define RS_TRIS_BIT TRISGbits.TRISG15 #define RS_LAT_BIT LATGbits.LATG15 #define LCD_RS RS_LAT_BIT // Definitions for WR pin #define WR_TRIS_BIT TRISGbits.TRISG14 #define WR_LAT_BIT LATGbits.LATG14 #define LCD_WR WR_LAT_BIT // Definitions for WR pin #define RD_TRIS_BIT TRISDbits.TRISD9 #define RD_LAT_BIT LATDbits.LATD9 // Data Port for 16 bits #define LCD_DATA LATB #define LCD_DATA_TRIS TRISB #define DataPortIn() LCD_DATA_TRIS = 0xffff; #define DataPortOut() LCD_DATA_TRIS = 0x0000;
- Custom LCD Driver (HX8347A_16BIT.c &.h)
The Library contains some blank custom driver files (.c and .h in separate folders w/in library) with the two basic functions, DeviceReset() and PutPixel() required, but empty. My previous LCD initialization code was dumped into DeviceReset() and similarly with the PutPixel(). I also needed to write my own routines for ClearDevice() and Bar(), to optimize drawing. This required the appropriate lines in the header file to be uncommented to use these functions over the Library’s.
HX8347A_16BIT.c
/*****************************************************************************
* Module for Microchip Graphics Library
HX8347 LCD Controller
* Custom display controller driver template
* By: Ryan Milewski, 2012
*****************************************************************************/
#include "Graphics/Graphics.h"
#include "HardwareProfile.h"
// Color
WORD_VAL _color;
// Clipping region control
SHORT _clipRgn;
// Clipping region borders
SHORT _clipLeft;
SHORT _clipTop;
SHORT _clipRight;
SHORT _clipBottom;
/*********************************************************************
* Function: void DelayMs(WORD time)
* PreCondition: none
* Input: time - delay in ms
* Output: none
* Side Effects: none
* Overview: delays execution on time specified in ms
* Note: none
********************************************************************/
void DelayMs(unsigned int msec)
{
unsigned int tWait, tStart;
tWait=(SYS_FREQ/2000)*msec;
tStart=ReadCoreTimer();
while((ReadCoreTimer()-tStart)<tWait); // wait for the time to pass
}
void LCD_write_COM(WORD data)
{
LCD_RS = 0;
LCD_CS = 0;
LCD_DATA = data;
LCD_WR = 0;
//Nop();
//Nop();
//Nop();
LCD_WR = 1;
LCD_CS = 1;
}
void LCD_write_DATA(WORD data)
{
LCD_RS = 1;
LCD_CS = 0;
LCD_DATA = data;
LCD_WR = 0;
//Nop();
//Nop();
//Nop();
LCD_WR = 1;
LCD_CS = 1;
}//end of WriteLCD_DATA()
void LCD_write_COM_DATA(BYTE index, WORD value)
{
LCD_write_COM(index);
LCD_write_DATA(value);
}
/*********************************************************************
* Function: void ResetDevice()
* PreCondition: none
* Input: none
* Output: none
* Side Effects: none
* Overview: resets LCD, initializes PMP
* Note: none
********************************************************************/
void ResetDevice(void)
{
// Set uController pins TRIS
AD1PCFG = 0xffff; //analog pins all digital
CS_TRIS_BIT = 0;
RS_TRIS_BIT = 0;
WR_TRIS_BIT = 0;
RD_TRIS_BIT = 0;
DataPortOut();
//Reset LCD
LCD_REST = 1;
DelayMs(5); //5ms delay
LCD_REST = 0;
DelayMs(10); //10ms delay
LCD_REST = 1;
DelayMs(20); //20ms delay
//Vendor gamma
LCD_write_COM_DATA(0x0046,0x00a4);
LCD_write_COM_DATA(0x0047,0x0053);
LCD_write_COM_DATA(0x0048,0x0000);
LCD_write_COM_DATA(0x0049,0x0044);
LCD_write_COM_DATA(0x004a,0x0004);
LCD_write_COM_DATA(0x004b,0x0067);
LCD_write_COM_DATA(0x004c,0x0033);
LCD_write_COM_DATA(0x004d,0x0077);
LCD_write_COM_DATA(0x004e,0x0012);
LCD_write_COM_DATA(0x004f,0x004c);
LCD_write_COM_DATA(0x0050,0x0046);
LCD_write_COM_DATA(0x0051,0x0044);
//240x320 window settings
LCD_write_COM_DATA(0x0002,0x0000); //Column address start2
LCD_write_COM_DATA(0x0003,0x0000); //column address start1
LCD_write_COM_DATA(0x0004,0x0000); //Column address end2
LCD_write_COM_DATA(0x0005,0x00ef); //Column address end1
LCD_write_COM_DATA(0x0006,0x0000); //Row address start2
LCD_write_COM_DATA(0x0007,0x0000); //Row address start1
LCD_write_COM_DATA(0x0008,0x0001); //Row address end2
LCD_write_COM_DATA(0x0009,0x003f); //Row address end1
//display settings
LCD_write_COM_DATA(0x0001,0x0006); //IDMON=0,INVON=1,NORON=1,PTLON=0
LCD_write_COM_DATA(0x0016,0x0078); //MY=0,MX=0,MV=0,ML=1,BGR=0,TEON=0
LCD_write_COM_DATA(0x0023,0x0095); //N_DC=1001 0101
LCD_write_COM_DATA(0x0024,0x0095); //PI_DC=1001 0101
LCD_write_COM_DATA(0x0025,0x00ff); //I_DC=1111 1111
LCD_write_COM_DATA(0x0027,0x0002); //N_BP=0000 0010
LCD_write_COM_DATA(0x0028,0x0002); //N_FP=0000 0010
LCD_write_COM_DATA(0x0029,0x0002); //PI_BP=0000 0010
LCD_write_COM_DATA(0x002a,0x0002); //PI_FP=0000 0010
LCD_write_COM_DATA(0x002c,0x0002); //I_BP=0000 0010
LCD_write_COM_DATA(0x002d,0x0002); //I_FP=0000 0010
LCD_write_COM_DATA(0x003a,0x0001); //N_RTN=0000,N_NW=001
LCD_write_COM_DATA(0x003b,0x0000); //P_RTN=0000,P_NW=001
LCD_write_COM_DATA(0x003c,0x00f0); //I_RTN=1111,I_NW=000
LCD_write_COM_DATA(0x003d,0x0000); //DIV=00
DelayMs(1); //1ms delay
LCD_write_COM_DATA(0x0035,0x0038); //EOS=38h
LCD_write_COM_DATA(0x0036,0x0078); //EQP=78h
LCD_write_COM_DATA(0x003e,0x0038); //SON=38h
LCD_write_COM_DATA(0x0040,0x000f); //GDON=0fh
LCD_write_COM_DATA(0x0041,0x00f0); //GDOFF
//Power Supply Settings
LCD_write_COM_DATA(0x0019,0x0049); //CADJ=0100,CUADJ=100,OSD_EN=1,60Hz
LCD_write_COM_DATA(0x0093,0x000f); //RADJ=1111, 100%
DelayMs(1); //1ms delay
LCD_write_COM_DATA(0x0020,0x0040); //BT=0100
LCD_write_COM_DATA(0x001d,0x0007); //VC1=111
LCD_write_COM_DATA(0x001e,0x0000); //VC3=000
LCD_write_COM_DATA(0x001f,0x0004); //VRH=0011
//VCOM Settings
LCD_write_COM_DATA(0x0044,0x004d); //VCM=101 0000
LCD_write_COM_DATA(0x0045,0x000e); //VDV=1 0001
DelayMs(1); //1ms delay
LCD_write_COM_DATA(0x001c,0x0004); //AP=100
DelayMs(2); //2ms delay
LCD_write_COM_DATA(0x001b,0x0018); //GASENB=0,PON=1,DK=1,XDK=0,VLCD TRI=0,STB=0
DelayMs(1); //1ms delay
LCD_write_COM_DATA(0x001b,0x0010); //GASENB=0,PON=1,DK=0,XDK=0,VLCD TRI=0,STB=0
DelayMs(1); //1ms delay
LCD_write_COM_DATA(0x0043,0x0080); //set VCOMG=1
DelayMs(2); //2ms delay
//Display On Setting
LCD_write_COM_DATA(0x0090,0x007f); //SAP=0111 1111
LCD_write_COM_DATA(0x0026,0x0004); //GON=0,DTE=0,D=01
DelayMs(1); //1ms delay
LCD_write_COM_DATA(0x0026,0x0024); //GON=1,DTE=0,D=01
LCD_write_COM_DATA(0x0026,0x002c); //GON=1,DTE=0,D=11
DelayMs(1); //1ms delay
LCD_write_COM_DATA(0x0026,0x003c); //GON=1,DTE=1,D=11
//Internal Register Settings
LCD_write_COM_DATA(0x0057,0x0002); //TEST_Mode=1: into test mode
LCD_write_COM_DATA(0x0095,0x0001); //SET DISPLAY CLOCK AND PUMPKING CLOCK TO SYCRONIZE
LCD_write_COM_DATA(0x0057,0x0000); //TEST Mode=0:exit TEST Mode
LCD_write_COM(0x0022);
}
void LCD_address_set(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2)
{
LCD_write_COM_DATA(0x0002,x1>>8); //Column address start2
LCD_write_COM_DATA(0x0003,x1); //Column address start1
LCD_write_COM_DATA(0x0004,x2>>8); //column address end2
LCD_write_COM_DATA(0x0005,x2); //column address end1
LCD_write_COM_DATA(0x0006,y1>>8); //Row address start2
LCD_write_COM_DATA(0x0007,y1); //row address start1
LCD_write_COM_DATA(0x0008,y2>>8); //row address end2
LCD_write_COM_DATA(0x0009,y2); //row address end1
LCD_write_COM(0x0022);
}
/*********************************************************************
* Function: void PutPixel(SHORT x, SHORT y)
* PreCondition: none
* Input: x,y - pixel coordinates
* Output: none
* Side Effects: none
* Overview: puts pixel
* Note: none
********************************************************************/
void PutPixel(SHORT x, SHORT y)
{
unsigned int ncolor;
ncolor = GetColor();
LCD_address_set(x,y,x,y);
LCD_write_DATA(ncolor);
}
/*********************************************************************
* Function: WORD GetPixel(SHORT x, SHORT y)
* PreCondition: none
* Input: x,y - pixel coordinates
* Output: pixel color
* Side Effects: none
* Overview: returns pixel color at x,y position
* Note: none
********************************************************************/
WORD GetPixel(SHORT x, SHORT y)
{
return (0);
}
/*********************************************************************
* Function: void ClearDevice(void)
* PreCondition: none
* Input: none
* Output: none
* Side Effects: none
* Overview: clears screen with current color and sets cursor to 0,0
* Note: none
********************************************************************/
void ClearDevice(void)
{
int i,j;
unsigned int ncolor;
ncolor = GetColor();
LCD_address_set(0,0,DISP_HOR_RESOLUTION-1,DISP_VER_RESOLUTION-1);
for(i=0;i<DISP_HOR_RESOLUTION;i++)
{
for(j=0;j<DISP_VER_RESOLUTION;j++)
{
LCD_write_DATA(ncolor);
}
}
}
/*********************************************************************
* Function: WORD Bar(SHORT left, SHORT top, SHORT right, SHORT bottom)
* PreCondition: none
* Input: left,top - top left corner coordinates,
* right,bottom - bottom right corner coordinates
* Output: For NON-Blocking configuration:
* - Returns 0 when device is busy and the shape is not yet completely drawn.
* - Returns 1 when the shape is completely drawn.
* For Blocking configuration:
* - Always return 1.
* Side Effects: none
* Overview: draws rectangle filled with current color
* Note: none
********************************************************************/
WORD Bar(SHORT left, SHORT top, SHORT right, SHORT bottom)
{
unsigned ncolor;
int i,j;
ncolor = GetColor();
LCD_address_set(left,top,right,bottom);
for(i=0;i<=(right-left);i++)
{
for(j=0;j<=(bottom-top);j++)
{
LCD_write_DATA(ncolor);
}
}
return (1);
}
- Select options in GraphicsConfig.h
This should be copied from Microchip and placed in your project folder (like the help file says). Put in the Horizontal and Verticle resolution defines your LCD and uncomment the Graphics options to be used.
- Replace DeviceDriver.h with Custom Driver
There are two Library files that need to be changed to use the custom driver in the #includes; Primitive.c and Graphics.h. In my case, #include “DeviceDriver.h” was replaced with “HX8347A_16BIT.h”.
Primitive.c
#include "HardwareProfile.h" // needed to provide values for GetMaxX() and GetMaxY() macros #include "HX8347A_16BIT.h" //Change to custom driver header HERE!! #include "Graphics/Primitive.h" #include "Compiler.h"
Then,
Graphics.h
////////////////////////////// INCLUDES //////////////////////////////
#include <stdlib.h> // needed because of malloc()
#include "GenericTypeDefs.h"
#include "GraphicsConfig.h"
#include "HX8347A_16BIT.h" // Display Driver layer
#include "Primitive.h" // Graphic Primitives layer
#include "GOL.h" // Graphics Object layer
At this point, the Library’s Primitive Layer can be tested. I just grabbed some example code to draw the basic shapes available, text, and some images. Yay!
- Custom Touchscreen Driver
The files Touchscreen.c and.h were copied to my project folder and renamed ADS7843Touchscreen.c and .h for customizing. Microchip’s dev boards all drive the touch screen using the ADC, but mine uses the ADS7843 chip which takes care of all that. I kept the function TouchGetMsg() which processes the touch actions into predefined states, and added my own code for initializing and TouchGetXY(). My function gets both x and y coordinates at the same time and needed multiple readings of each and averaged to reduce noise. The ADS7843 has a convientent PenIRQ pin to signal an actual touch or an Idle condition (x = -1,y = -1).
ADS7843Touchscreen.c
SHORT touchX,touchY;
void spistart(void)
{
D_CS = 1;
D_CLK = 1;
D_DIN = 1;
}//end of spistart()
void ADS7843_write(unsigned char num)
{
unsigned int count,mask,temp;
int i;
D_CLK = 0;
mask = 0x80;
for(count=0;count<8;count++)
{
temp = mask#
if (temp == 0) D_DIN = 0;
else D_DIN = 1;
//D_DIN = temp>>(count);
D_CLK = 0;
for(i=0;i<5;i++)
{
Nop();
}
D_CLK = 1;
for(i=0;i<5;i++)
{
Nop();
}
mask>>=1;
}
}//end of ADS7843_write()
unsigned int ADS7843_read(void)
{
unsigned int count;
unsigned int num;
int i;
num = 0;
for(count=0;count<12;count++)
{
num<<=1;
D_CLK = 1;
for(i=0;i<5;i++)
{
Nop();
}
D_CLK = 0;
for(i=0;i<5;i++)
{
Nop();
}
if(D_DOUT) num++;
}
return(num);
}//end of ADS7843_read()
void TouchInit(void)
{
//Port Init
D_CLK_TRIS = 0;
D_CS_TRIS = 0;
D_DIN_TRIS = 0;
D_DOUT_TRIS = 1;
D_IRQ_TRIS = 1;
spistart();
}
void TouchGetXY(void)
{
int i,count,x_set,y_set;
int TP_X,TP_Y;
count =0;
x_set = 0;
y_set = 0;
while(count<8)
{
//PORTAbits.RA1 = 1;
//Delay1KTCYx(4); //2ms delay (8MHz clk)
D_CS = 0;
ADS7843_write(0xd4);
D_CLK = 1;
for(i=0;i<5;i++)
{
Nop();
}
D_CLK = 0;
for(i=0;i<5;i++)
{
Nop();
}
y_set = y_set + ADS7843_read();
count++;
}
count = 0;
while(count<16)
{
ADS7843_write(0x94);
D_CLK = 1;
for(i=0;i<5;i++)
{
Nop();
}
D_CLK = 0;
for(i=0;i<5;i++)
{
Nop();
}
x_set = x_set + ADS7843_read();
count++;
}
D_CS = 1;
TP_X = x_set/16;
TP_Y = y_set/8;
touchX = .0925*TP_X-.0040*TP_Y-31.1315; //X-coordinate
touchY = .0006*TP_X+.0661*TP_Y-19.5759; //Y-coordinate
}
SHORT TouchGetX(void)
{
int x;
x = touchX;
return(x);
}
SHORT TouchGetY(void)
{
int y;
y = touchY;
return(y);
}
int TouchIRQ(void)
{
int temp;
temp = D_IRQ;
return(temp);
}
Those functions will interact with Microchip’s TouchGetMsg(), and only needs ads7843touchscreen.h included in the main .c file source.
- Add required main() code
A little bit of code needs to be added to the main() while loop, which is shown more than once in a Microchip app note. Also a data structure, GOL_MSG msg, to relay events needs to be cast.
So hopefully your project is going. Adding and interacting with the widgets is pretty straight forward and documented in the help file (you should have been there already). I had several issues along the way, such as:
- The default font. Solution: use Font25 or Font35 and cast correctly.
- Start with the newest version 3 something, drastic changes were made and things didn’t work.
- While developing touch screen driver, the data wasn’t being transferred to the rest of the GOL, so the widgets wouldn’t draw as pushed. Solution: start new project completely with same drivers. ?????
Introducing the Commander32
Hi-dilly-ho neglete-arino, I mean blog. I’ve put together a new microcontroller setup after the previous one was too slow at calculating fractals.
This lovely set of complex numbers only took several hours to generate.
This new setup, dubbed the Commander32, consists of a Pic32 Starter Kit, eflighworks companion board(barebones w/ socket, I added the rows of headers) and an HX8347 controlled 3.2″ TFT LCD from eBay. The code for the previous 18F controller ported easily, once switching to writing to the ports with the LATx registers instead of the usual PORTx. Since Port B is 16-bits wide, this was connected directly to the LCD data pins, and made programming even easier. The remaining four control pins were connected to the upper bits of Port G, that didn’t have any other peripheral features. I might switch the data pins to use the PMP feature to free up the analog pins on port B.
Let's give the new microcontroller a big round of micro-plause. Micro-plause? I'm not writing that.
The touchscreen is also working, and improved. An app note on calibration from Ti showed how to use a couple matrices to generate the conversion equation coefficients. It was easiest to solve with Matlab, instead of expanding manually and having the microcontroller crunch the numbers. The next issue was the considerable noise in the x direction, causing one point to stretch to a little line. This was fixed by taking multiple readings, then averaging. So now I plenty of pins and speed to use the sd memory socket on the LCD board, plus a wireless device and some sensors or something. Porting the code was easy enough, and was more of finding the tricks for the Starter Kit, like what pins not to use with debugging. Maybe I’ll build a micro-touch-circuit-thing, and call it iTouchMyself.
Black Rynius' Blog 