Tool/software: Code Composer Studio
This code used to give a LCD upcount with a delay of 1 sec when I used the for loop multiplier as 80000. Now I have reduced it to 80 still it is providing the same amount of delay. No code is changed for clock.
With a delay loop of 80 it should provide a delay of 10us but it is providing now one sec delay. What could be the possibility of change in the speed.
#include <msp430F2616.h>
#define DR P5OUT = P5OUT | BIT7 // define RS high
#define CWR P5OUT = P5OUT & (~BIT7) // define RS low
#define READ P5OUT = P5OUT | BIT5 // define Read signal R/W = 1 for reading
#define WRITE P5OUT = P5OUT & (~BIT5) // define Write signal R/W = 0 for writing
#define ENABLE_HIGH P5OUT = P5OUT | BIT6 // define Enable high signal
#define ENABLE_LOW P5OUT = P5OUT & (~BIT6) // define Enable Low signal
void check_busy(void);
void data_read(void);
void delay(unsigned int wt);
void init(void);
void init_lcd(void);
void wr_lcd_cw(unsigned char lcd_cmd);
void wr_lcd_dw(unsigned char wr_lcd_dw);
void lcd_msg(unsigned char *ch);
unsigned int a,b,c,d,e,f;
//PIN R/W =
/*
* main.c
*/
unsigned char array[10]={"0123456789"};
int main(void) {
volatile unsigned int i ;
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
init();
init_lcd();
//delay(500);
wr_lcd_cw(0x80);
lcd_msg(( unsigned char *)"UP count");
while (1)
{
for(a=0;a<10;a++)
{
wr_lcd_cw(0xC0);
wr_lcd_dw(array[a]);
for(b=0;b<10;b++)
{
wr_lcd_cw(0xC1);
wr_lcd_dw(array[b]);
for(c=0;c<10;c++)
{
wr_lcd_cw(0xc2);
wr_lcd_dw(array[c]);
for(d=0;d<10;d++)
{
wr_lcd_cw(0xc3);
wr_lcd_dw(array[d]);
P1OUT ^= BIT5|BIT6|BIT7; // Toggle P1.0 using exclusive-OR
delay(1200);
}
}
}
}
}
}
void delay(unsigned int wt)
{
unsigned int k;
volatile unsigned int i ;
for(k=0;k <= wt ;k++)
{
for( i = 0 ; i <= 80 ; i++ );
}
}
void lcd_msg(unsigned char *ch)
{
while(*ch !='\0')
{
wr_lcd_dw(*ch);
ch++;
}
}
void wr_lcd_cw(unsigned char lcd_cmd){
// check_busy();
P4OUT=lcd_cmd;
CWR;
WRITE;
ENABLE_HIGH;//EN=1
delay(3);
ENABLE_LOW;//EN=0
}
void wr_lcd_dw(unsigned char lcd_data){
// check_busy();
P4OUT=lcd_data;
DR;
WRITE;
ENABLE_HIGH;//EN=1
delay(3);
ENABLE_LOW;//EN=0
}
void init_lcd(void)
{
wr_lcd_cw(0x38);delay(10);//LCD in 8 bit mode
wr_lcd_cw(0x0e);delay(10);//LCD in 8 bit mode
wr_lcd_cw(0x06);delay(10);//LCD in 8 bit mode
wr_lcd_cw(0x01);delay(10);//LCD in 8 bit mode
//lcd_content(0x02);//return to home location
}
void init(void)
{
DCOCTL = 0x56;
BCSCTL1 = 0xC7;
BCSCTL2 = 0x00;
BCSCTL3 = 0x20;
P1SEL=0;
P5SEL=0;
P4SEL=0;
P1DIR=0xff;
P4DIR=0xff;
P5DIR=0xff;
P1DIR |= BIT5|BIT6; // Set P4 bits 5 and 6 to output direction
P4DIR = 0XFF; // Set Port 4 as output
P5DIR = 0XFF; // Set Port 5 as output
P4OUT = 0X00;
P5OUT = 0X00;
}
void check_busy(void)
{
P4DIR &= ~(BIT7); // make P2.3 as input
data_read();
while((P4IN & BIT7)==1)
{
data_read();
}
P4DIR |= BIT7; // make P2.3 as output
}
void data_read(void)
{
CWR;
READ;
ENABLE_LOW;
delay(2);
ENABLE_HIGH;
}
