Massively sped up LCD comms

example.c

@@ -8,19 +8,12 @@
 //**********************************************************************
 //**********************************************************************
 
-#include <at89c55.h>
+#include <at89c51ed2.h>
 #include <stdio.h>
 #include <stdint.h>
 
 #define TICK_RATE 100
-#define NPER (0x10000 - (20000000 / 12 / TICK_RATE))
+#define NPER (0x10000 - (20000000 / 6 / TICK_RATE))
-
-// Missing port definitions
-__sbit __at (0xC4) P4_4;
-__sbit __at (0xC3) P4_3;
-__sbit __at (0xC2) P4_2;
-__sbit __at (0xC1) P4_1;
-__sbit __at (0xC0) P4_0;
 
 // I/O definitions
 #define BUTTON_1 P3_2
@@ -71,8 +64,7 @@ uint8_t lcd_pos;
 
 // Quick'n'dirty CPU pause, just enough for the LCD to stabilize.
 void lcd_pause(void) {
-	int i = 30;
+	__asm__ ("nop");
-	while(i--);
 }
 
 // Reads the status register from the LCD.
@@ -170,11 +162,8 @@ void lcd_init(void) {
 // Puts a character to the LCD. Correctly handles '\n'.
 void lcd_putchar(char c) {
 	if(c == 10) {
-		while((lcd_pos != 0) && (lcd_pos != 40)) {
+		if(lcd_pos < 40) lcd_pos = 40;
-			lcd_send_data(32);
+		else lcd_pos = 0;
-			lcd_pos++;
-			if(lcd_pos == 80) lcd_pos=0;
-		}
 	} else {
 		lcd_send_data(c);
 		lcd_pos++;
@@ -184,6 +173,8 @@ void lcd_putchar(char c) {
 
 // Initializes the background tick timer (for delays).
 void timer_init(void) {
+	CKCON0 = X2; // Enable 2x clock mode
+
 	// Initialize timer 0 as 16-bit countdown, timer 1 as 8-bit auto-reload countdown
 
 	TMOD = 0x21;
@@ -204,7 +195,7 @@ void serial_init(void) {
 	// Initialize timer 2 as 312500 Hz as the baud rate generator (for tulflash)
 
 	RCAP2H = 0xFF;
-	RCAP2L = 0xFE;
+	RCAP2L = 0xFC;
 	T2CON = 0x34;
 
 	// Initialize serial I/O
@@ -296,6 +287,8 @@ void main(void) {
 	lcd_init();
 	serial_init();
 
+	delay(1);
+
 	stdout_to_serial = 1;
 	stdout_to_lcd = 1;