Код: //****************************************************************
// TITLE: SED1520LCD.C
// DATE: 04 DEC 05
// BY: JV
// DESCRIPTION: SED1520 code for CCS graphics
// driver
//----------------------------------------------------------------
// Revision: V1.0 (first release)
//****************************************************************
// PICCore Pin definitions----------//
#define LCD_CS1 PIN_C2 // Enable Left Side of LCD
#define LCD_CS2 PIN_C3 // Enable Right Side of LCD
#define LCD_RW PIN_C1 // Read/Write
#define LCD_A0 PIN_C0 // Control or Data
#define D0 PIN_D0 // Databus 0
#define D1 PIN_D1 // Databus 1
#define D2 PIN_D2 // Databus 2
#define D3 PIN_D3 // Databus 3
#define D4 PIN_D4 // Databus 4
#define D5 PIN_D5 // Databus 5
#define D6 PIN_D6 // Databus 6
#define D7 PIN_D7 // Databus 7
// Tell CCS Graphics.c how big the display is
#define GLCD_WIDTH 100 // Number of Horizontal pixels
#define GLCD_HEIGHT 32 // Number of Vertical Pixels
#define LEFT 1
#define RIGHT 0
// Global Variables for this application (LCD)
int SIDE; // Left or Right side of LCD
// Function Prototype for CCS Graphics.c driver
void glcd_pixel(int8, int8, int1); // Required for CCS GRAPHICS.C
//===============================================================
// command_write (Cdata)
// Write command data to the LCD
// See SED1520 datasheet for more info
//===============================================================
void LCDCWrite(int8 CData) // Write Instruction to LCD
{
if (SIDE==LEFT)
{
OUTPUT_LOW(LCD_A0); // Instruction (not display data)
OUTPUT_LOW(LCD_RW); // We are going to WRITE Data
OUTPUT_LOW(LCD_CS1); // CS Low on the LEFT side of the display
delay_cycles(10);
OUTPUT_HIGH(LCD_CS1); // CS High (starts cycle)
OUTPUT_D(CData); // Put the data on the bus
delay_cycles(2);
OUTPUT_LOW(LCD_CS1); // Latch the data into the LCD
delay_cycles(2);
}
else // The RIGHT hand side
{
OUTPUT_LOW(LCD_A0); // Instruction (not display data)
OUTPUT_LOW(LCD_RW); // We are going to WRITE Data
OUTPUT_LOW(LCD_CS2); // CS Low on the RIGHT side of the display
delay_cycles(10);
OUTPUT_HIGH(LCD_CS2); // CS High (starts cycle)
OUTPUT_D(CData); // Put the data on the bus
delay_cycles(2);
OUTPUT_LOW(LCD_CS2); // Latch the data into the LCD
delay_cycles(2);
}
}
//===============================================================
// Data write (DData)
// Writes display data to the LCD
//===============================================================
void LCDWrite(int8 DData) // Write Data to LCD
{
OUTPUT_HIGH(LCD_A0); // Data (not instruction)
OUTPUT_LOW(LCD_RW); // We are going to WRITE Data
if(SIDE==LEFT)OUTPUT_LOW(LCD_CS1); // If Left side then use CS1
if(SIDE==RIGHT)OUTPUT_LOW(LCD_CS2); // If Right side then use CS2
delay_cycles(2);
if(SIDE==LEFT) OUTPUT_HIGH(LCD_CS1);
if(SIDE==RIGHT) OUTPUT_HIGH(LCD_CS2);
OUTPUT_D(DData); // Put the data onto the bus
delay_cycles(10);
if(SIDE==LEFT) OUTPUT_LOW(LCD_CS1); // and latch the data into
if(SIDE==RIGHT) OUTPUT_LOW(LCD_CS2); // the LCD display
delay_cycles(2);
}
//===============================================================
// Display data read
// Reads the display data pointed to by the page, column and
// chip select. Returns the data.
//===============================================================
int8 LCDRead() // Read Data from LCD
{
int8 DData;
if(SIDE==LEFT) OUTPUT_HIGH(LCD_CS1);
if(SIDE==RIGHT) OUTPUT_HIGH(LCD_CS2);
OUTPUT_HIGH(LCD_A0); // Data
OUTPUT_HIGH(LCD_RW); // Read Data
if(SIDE==LEFT)OUTPUT_LOW(LCD_CS1);
if(SIDE==RIGHT)OUTPUT_LOW(LCD_CS2);
delay_cycles(2);
set_tris_d(0xff); // Allow LCD to drive the data lines
if(SIDE==LEFT) OUTPUT_HIGH(LCD_CS1);
if(SIDE==RIGHT) OUTPUT_HIGH(LCD_CS2);
delay_cycles(50);
DData=INPUT_D(); // Get the data
if(SIDE==LEFT) OUTPUT_LOW(LCD_CS1);
if(SIDE==RIGHT) OUTPUT_LOW(LCD_CS2);
delay_cycles(2);
return(DData);
}
//===============================================================
// Draw a single pixel
// This is required by the Graphics.c driver file provided by
// CCS. It tells the driver how to draw a single pixel anywhere
// on the LCD display
// x=1 to 122 y=1 to 32 color=1=ON color=0=OFF
//===============================================================
void glcd_pixel(int8 x, int8 y, int1 color)
{
int8 ucMask;
int8 i;
int8 Data;
x-=1;
// Which side of the display (which SED1520 controller)
if (x<(GLCD_WIDTH/2)) SIDE = LEFT;
else SIDE = RIGHT;
// Which vertical page needs selecting
Data=184+((y-1)/8); // Control data to write is
LCDCWrite(Data); // 184 + the page number (0-3)
if (y>8)y-=((Data-184)*8); // y should always be 1-8
// Horizontal position (column)
if (x>=(GLCD_WIDTH/2)) // x should always be 0-61
x-=(GLCD_WIDTH/2); // for each half of the LCD
LCDCWrite(x); // Go to column 'x'
LCDCWrite(0xe0); // Start R-M-Write operation
LCDRead(); // Dummy Read
Data = LCDRead(); // Read LCD dissplay data
ucMask = 1; // Create a bit mask of the
for (i=1;i<y;i++) // pixel to change
ucMask<<=1; //
if (color) Data|=ucMask; // Set or clear the pixel as
else Data&=~ucMask; // requested
LCDWrite(Data);
LCDCWrite(0xee); // End R-M-Write operation
}
//===================================================================
// Initialise the SED11520 controllers
// for the display type we are using
//===================================================================
void InitSED1520()
{
int8 i;
// Setup both SED1520 ccontrollers
for (i=0;i<2;i++)
{
SIDE=i;
LCDCWrite(0xaf); // Turn on the display
LCDCWrite(0xa4); // Static drive is off
LCDCWrite(0xa9); // Duty cycle is set to 1/32
LCDCWrite(0xe2); // Reset the chip
LCDCWrite(0xa0); // Set ADC
LCDCWrite(0xee); // Read modify write disabled
LCDCWrite(0xc0); // Set the start position to
LCDCWrite(0xb8); // the top left of the display
LCDCWrite(0x00); // in column 0
}
OUTPUT_LOW(LCD_CS1); // De-select each side to start
OUTPUT_LOW(LCD_CS2); //
delay_ms(60);
}
void ClearScreen(){
int8 i,j,k;
for(k=0;k<2;k++){ // Clear both controlers data
SIDE=k;
for(j=0;j<4;j++){ // Now go through all pages and clear the LCD RAM
LCDCWrite(184+j); // so that the display is cleared
LCDCWrite(0);
for(i=0;i<=(GLCD_WIDTH/2);i++) LCDWrite(0x00);
}
}
}
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