Paul Evans
Newhaven 320x240 LCD
Diff: newhaven.cpp
- Revision:
- 2:2058e2f79157
- Parent:
- 0:c8893901ef8a
- Child:
- 3:1cf3ec6c70d7
--- a/newhaven.cpp Sun Feb 27 21:14:19 2011 +0000
+++ b/newhaven.cpp Sun Feb 27 21:40:59 2011 +0000
@@ -1,3 +1,7 @@
+/* mbed Newhaven LCD Library
+ * Copywrite (c) 2011, Paul Evans
+ */
+
#include "mbed.h"
#include "newhaven.h"
@@ -8,17 +12,17 @@
void delay(unsigned int n)
{
- unsigned int i,j;
- for (i=0;i<n;i++)
- for (j=0;j<350;j++)
- {;}
+ unsigned int i,j;
+ for (i=0;i<n;i++)
+ for (j=0;j<350;j++)
+ {;}
}
void delay1(unsigned int i)
{
- while(i--);
+ while(i--);
}
-
+// send commands to the LCD
void NHLCD::comm_out(unsigned char j){
LCD_PORT->output();
A0 = 1;
@@ -32,6 +36,7 @@
CS = 1;
}
+// send data to the LCD
void NHLCD::data_out(unsigned char j){
LCD_PORT->output();
A0 = 0;
@@ -45,101 +50,107 @@
CS = 1;
}
+// clears the entire screen
void NHLCD::clearScreen(){
int n;
- comm_out(0x46);
- data_out(0x00);
- data_out(0x00);
- comm_out(0x42);
- for(n=0;n<1200;n++){
- data_out(0x20);
- }
- comm_out(0x46);
- data_out(0xB0);
- data_out(0x04);
- comm_out(0x42);
- for(n=0;n<9600;n++){
- data_out(0x00);
- }
-}
-
-void NHLCD::text(char *text, char row, char col){
- int c = row*40+col;
- comm_out(0x46);
- data_out((unsigned char)(c&0xFF));
- data_out((unsigned char)((c&0xFF00)>>8));
- comm_out(0x42);
- while(*text != 0) {
- data_out(*text);
- text++;
+ comm_out(0x46); // command to set cursor location
+ data_out(0x00); // 0x00 is the start of text screen
+ data_out(0x00);
+ comm_out(0x42); // command to write data
+ for(n=0;n<1200;n++){ // 1200 locations on the screen
+ data_out(0x20); // fill each with a blank
+ }
+ comm_out(0x46); // command to set cursor location
+ data_out(0xB0); // 0x4B0 is the start of drawing screen
+ data_out(0x04);
+ comm_out(0x42); // command to write data
+ for(n=0;n<9600;n++){ // 9600 total byte locations
+ data_out(0x00); // set each to 0
}
}
+// write text on the screen
+void NHLCD::text(char *text, char row, char col){
+ int c = row*40+col; // gets the correct address for the cursor
+ comm_out(0x46); // command to set cursor location
+ data_out((unsigned char)(c&0xFF)); // lower 8 bits of address
+ data_out((unsigned char)((c&0xFF00)>>8)); // upper 8 bits of address
+ comm_out(0x42); // command to write data to screen
+ while(*text != 0) { // write until you hit a null terminator
+ data_out(*text); // write the current character to the screen
+ text++; // move to the next character
+ }
+}
+/* set an individual pixel on the screen.
+ * pixels are grouped in bytes, so you must isolate a particular pixel.
+ */
+void NHLCD::setPixel(int row, int col){
+ int loc = (0x04<<8)|(0xB0); //sets location to the top left corner of drawing screen
+ int c = loc+row*40+(col/8); // gets address of the correct byte
+ comm_out(0x46); // command to set cursor location
+ data_out((unsigned char)(c&0xFF)); // lower 8 bits of address
+ data_out((unsigned char)((c&0xFF00)>>8)); // upper 8 bits of address
+ comm_out(0x43); // command to read the byte
+ LCD_PORT->input(); // sets the buffer to input data
+ unsigned char buffer = LCD_PORT->read(); // stores byte in buffer
+ buffer = buffer|(1<<(7-((row*320+col)%8))); // sets the particular pixel on the byte
+ LCD_PORT->output(); // sets the buffer to output data
+
+ comm_out(0x46); //command to set cursor location
+ data_out((unsigned char)(c&0xFF)); // lower 8 bits of address
+ data_out((unsigned char)((c&0xFF00)>>8)); // upper 8 bits of address
+ comm_out(0x42); // command to write to the screen
+ data_out(buffer); // write buffer to the screen
+}
+
+// initialize the LCD
void NHLCD::Init(void){
+ /* reset the device */
RST = 0;
delay(5);
RST = 1;
delay(10);
- comm_out(0x40);
+ comm_out(0x40); // system set command
delay(5);
- data_out(0x30); //parameters
- data_out(0x87); //horizontal character size (0x80 = 1) MUST BE MULTIPLE OF 320
- data_out(0x07); //vertical character size (0x00 = 1) MUST BE MULTIPLE OF 240
- data_out(40); //addresses per line
- data_out(80);
- data_out(0xEF);
- data_out(0x28);
- data_out(0x00);
+ data_out(0x30); // parameters
+ data_out(0x87); // horizontal character size (0x80 = 1) MUST BE MULTIPLE OF 320
+ data_out(0x07); // vertical character size (0x00 = 1) MUST BE MULTIPLE OF 240
+ data_out(40); // addresses per line
+ data_out(80); // bytes per line
+ data_out(0xEF); // 240 displace lines
+ data_out(0x28); // virtual address 1
+ data_out(0x00); // virtual address 2
- comm_out(0x44);
- data_out(0x00);
- data_out(0x00);
- data_out(0xEF);
- data_out(0xB0);
- data_out(0x04);
- data_out(0xEF);
- data_out(0x00);
- data_out(0x00);
- data_out(0x00);
- data_out(0x00);
+ comm_out(0x44); // scroll
+ data_out(0x00); // start address 1
+ data_out(0x00); // start address 2
+ data_out(0xEF); // 240 lines
+ data_out(0xB0); // 2nd screen start1
+ data_out(0x04); // 2nd screen start2
+ data_out(0xEF); // 2nd screen 240 lines
+ data_out(0x00); // 3rd screen address1
+ data_out(0x00); // 3rd screen address2
+ data_out(0x00); // 4th screen address1
+ data_out(0x00); // 4th screen address2
- comm_out(0x5A);
- data_out(0x00);
+ comm_out(0x5A); // hdot scr
+ data_out(0x00); // horizontal pixel shift = 0
- comm_out(0x5B);
- data_out(0x00);
+ comm_out(0x5B); // overlay
+ data_out(0x00); // OR
- comm_out(0x58);
- data_out(0x56);
+ comm_out(0x58); // set display
+ data_out(0x56);
- comm_out(0x5D);
- data_out(0x04);
- data_out(0x86);
+ comm_out(0x5D); // cursor form
+ data_out(0x04); // 5 pixels wide
+ data_out(0x86); // 7 pixels tall
- comm_out(0x4C);
+ comm_out(0x4C); // cursor direction = right
- comm_out(0x59);
- data_out(0x16);
+ comm_out(0x59); // disp on/off
+ data_out(0x16); // on
wait_ms(5);
}
-
-void NHLCD::setPixel(int row, int col){
- int loc = (0x04<<8)|(0xB0);
- int c = loc+row*40+(col/8);
- comm_out(0x46);
- data_out((unsigned char)(c&0xFF));
- data_out((unsigned char)((c&0xFF00)>>8));
- comm_out(0x43);
- LCD_PORT->input();
- unsigned char buffer = LCD_PORT->read();
- buffer = buffer|(1<<(7-((row*320+col)%8)));
- LCD_PORT->output();
-
- comm_out(0x46);
- data_out((unsigned char)(c&0xFF));
- data_out((unsigned char)((c&0xFF00)>>8));
- comm_out(0x42);
- data_out(buffer);
-}