Hello Friends!
I am working with the MC9S12DG128 and attempting to utilize the onboard timer defined as TCNT. I am attempting to program the HD44780 LCD which is integrated on my EVALH1 board from technological arts. I have been following various online examples for 4 bit initialization and I believe that timing is the issue which I am having right now. My questions would have to be:
1) Is there a better timing method that you could think of?
2) Within code warrior is there a way that I can test if my delay is delaying to the proper time, I cannot seem to see where it shows the clock cycles.
Here is my timer & main code given in that order code:
Timer:
void timer_init(void)
{
TSCR1 = 0x80; // SET TEN (TIMER ENABLE BIT)
TSCR2 = 0x03; // SET PRESCALER TO DIVIDE BUS CLOCK BY 8 WHICH GIVES US A PERIOD OF 1uS
}
void timer_wait1us(unsigned short z)
{
unsigned short start1; // NOTE THAT THE FIRST VALUE OF THE FOR LOOP HAS BEEN LEFT EMPTY SO WE MAY DEFINE IT WITHIN THE PROGRAM
for(;z>0;z--)
{
start1 = TCNT;
while ((TCNT - start1) <=1) // -start1 IS USED TO SET THE TIMER BACK TO 0 BEFORE WE READ FROM IT
{}
}
}
void timer_wait1ms (unsigned short x)
{
unsigned short start2;
for(;x>0;x--)
{
start2 = TCNT;
while ((TCNT - start2) <= 1000)
{}
}
}
Main:
#include <hidef.h> /* common defines and macros */
#include "derivative.h" /* derivative-specific definitions */
#include "Timer.h"
void toggle_enable(void);
void outcmd(unsigned char command);
void clear (void);
void output(unsigned char letter);
void main(void) {
unsigned long z;
DDRS = 0xFF;
DDRE = 0xFF;
timer_init();
timer_wait1ms(20);
outcmd(0x30);
timer_wait1ms(5);
outcmd(0x30);
timer_wait1us(160);
outcmd(0x30);
timer_wait1us(160);
outcmd(0x20);
timer_wait1ms(5);
outcmd(0x28);
timer_wait1ms(5);
outcmd(0x08);
timer_wait1ms(5);
clear();
outcmd(0x0E);
timer_wait1ms(50);
// CONSISTANT UNTIL HERE
outcmd(0x06);
timer_wait1ms(50);
outcmd(0x0C);
timer_wait1ms(50);
output(0x48);
EnableInterrupts;
for(;
{
_FEED_COP(); /* feeds the dog */
} /* loop forever */
/* please make sure that you never leave main */
}
void toggle_enable(void){
PORTE_BIT4 = 1;
timer_wait1us(2);
PORTE_BIT4 = 0;
timer_wait1ms(5);
}
void outcmd(unsigned char command){
PTS = 0xF0 & command;
toggle_enable();
PTS = 0xF0 & (command<<4);
toggle_enable();
}
void clear(void){
outcmd(0x01);
timer_wait1ms(5);
outcmd(0x02);
timer_wait1ms(5);
}
void output(unsigned char letter){
PORTE_BIT7 = 1;
toggle_enable();
PTS = 0xF0 & letter;
toggle_enable();
PTS = 0xF0 & (letter<<4);
toggle_enable();
}
Thank you so very much for your time I greatly appreciate anything you may be able to help me with!
