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hemnath
Joined: 03 Oct 2012
Posts: 241
Location: chennai
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| Increment count on LCD display? |
 Posted: Mon Nov 05, 2012 10:28 pm |
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I want to increment a count and display in lcd, when pushbutton is pressed. Button connected to PIN C0. It compiles successfully. In the display it shows count, but when i press push button it shows different characters at location 0x86 in the display. Please help...
| Code: | #include "18F2520.h"
#fuses INTRC_IO
#use delay(clock=4000000) // internal clock
#define RS PIN_A2
#define EN PIN_A1
void lcd_init();
void lcd_cmd(unsigned char);
void lcd_data(unsigned char);
unsigned char data[] = "count";
unsigned int i = 0;
unsigned int counter = 0;
int16 temp;
void main()
{
lcd_init();
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_256|RTCC_8_BIT);
while(1)
{
while(data[i]!='\0')
{
lcd_data(data[i]);
i++;
}
lcd_cmd(0x86);
if(input(PIN_C0)==0)
{
delay_ms(200);
temp=counter++;
lcd_data(temp);
}
}
}
void lcd_init()
{
lcd_cmd(0x30); // Configure the LCD in 8-bit mode, 1 line and 5x7 font
lcd_cmd(0x0C); // Display On and Cursor Off
lcd_cmd(0x01); // Clear display screen
lcd_cmd(0x06); // Increment cursor
lcd_cmd(0x80); // Set cursor position to 1st line, 1st column
}
void lcd_cmd(unsigned char c)
{
output_b(c);
output_low(RS);
output_high(EN);
delay_ms(15);
output_low(EN);
}
void lcd_data(unsigned char z)
{
output_b(z);
output_high(RS);
output_high(EN);
delay_ms(15);
output_low(EN);
}
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Mike Walne
Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK
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| Posted: Tue Nov 06, 2012 2:36 am |
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Please explain what you are expecting to see on the display with what you actually get.
Maybe you're confusing ASCII char with numeric value.
Mike |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Tue Nov 06, 2012 3:35 am |
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As Mike already suggested, the value you are sending to the display is a binary value. What you see on the LCD is the corresponding ASCII value and this won't make sense to us humans.
You need to convert the binary data to readable text first, for example using the function itoa() or sprintf("%d").
CCS has implemented a very useful extension to the printf function where you can redirect the output to another function that will display the data. This output function should have a single character as parameter, just like your lcd_data function so that makes it very easy.
Replace by: | Code: | | printf(lcd_data, "%d", temp); |
Note that you can make your program a lot simpler when you add your text 'count' to the above line, but I leave that as an exercise to you. |
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Kumara
Joined: 16 Oct 2013
Posts: 7
Location: Sri Lanka
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| Posted: Tue Oct 22, 2013 4:05 am |
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| Mike Walne wrote: | Please explain what you are expecting to see on the display with what you actually get.
Maybe you're confusing ASCII char with numeric value.
Mike |
Hi, Please refer following code for incensement counter with debouncing solution.
Kumara
| Code: |
#include <16F877A.h> // Pic Microcontroller (MCU) Select
#DEVICE ADC=10 // 8 Bit analog resolution
#fuses NOWDT,HS, NOPUT, NOPROTECT // Fuses
#fuses NOBROWNOUT, NOLVP // Fuses
#use delay(clock=20000000) // Crystal Oscillator Frequency ( 20 MHZ)
#include <lcd.c> // Driver for LCD Module
void main() // Main block
{
INT16 PRE_COUNT=0; // Declare variable)
INT16 SET_COUNT; // Declare variable
INT1 SW1; // Declare variable
BOOLEAN ISPRESSED=FALSE; // Boolean logic=0;
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_INTERNAL);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
lcd_init();
while (TRUE) { // Endless loop
SW1=INPUT(PIN_C0); // Positive inputs
IF(PRE_COUNT==0)
{
lcd_putc("\f"); // LCD clear
lcd_gotoxy(1,1); // Select Raw 1 & start digit 1 position
printf(lcd_putc," PRE_COUNT:%04LU ",PRE_COUNT);
lcd_gotoxy(1,2); // Select Raw 2 & start digit 1 position
printf(lcd_putc," SET_COUNT:%04LU ",SET_COUNT);
DELAY_MS(200);
}
////////////////////////////////////////////////////////
SET_ADC_CHANNEL(0); // INPUT AN0
DELAY_US(100);
SET_COUNT=READ_ADC(); // SET VALUE= RA1 ( 10K V/R )
SET_COUNT=(SET_COUNT); // FOR 4 DIGITS UP TO 1023
////////////////////////////////////////////////////////
IF (SW1 && !ISPRESSED) // This line must be here
{
DELAY_MS(10); // This line must be here
SW1=INPUT(PIN_A1); // This line must be here
IF(SW1) // This line must be here
{PRE_COUNT++; // This line must be here
ISPRESSED=TRUE; // This line must be here
lcd_putc("\f"); // LCD clear
lcd_gotoxy(1,1); // Select Raw 1 & start digit 1 position
printf(lcd_putc," PRE_COUNT:%04LU ",PRE_COUNT);
lcd_gotoxy(1,2); // Select Raw 2 & start digit 1 position
printf(lcd_putc," SET_COUNT:%04LU ",SET_COUNT);
DELAY_MS(100);
IF(PRE_COUNT>=SET_COUNT) // This line must be here
{
OUTPUT_HIGH(PIN_B0);
}
ELSE
{
OUTPUT_LOW(PIN_B0);
}
}
}
IF(!SW1) // This line must be here
{
ISPRESSED=FALSE; // This line must be here
}
}
}
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