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that guy
Guest
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| displaying values on LCD |
 Posted: Fri Feb 27, 2009 2:46 pm |
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I have a PIC 18f4520 that i am using with the PICDEM 2 Plus demo board, the Rohs version. I can output stand text, but now I want to output a value.
| Code: |
#include <18F4520.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#define LCD_POWER PIN_D7
#include "Flex_LCD.c"
int num = 0;
//============================
void main()
{
output_high(LCD_POWER); // Turn on power to LCD
output_low(LCD_RW); // Set R/W pin on LCD to a low level
lcd_init(); // Initialize the LCD
lcd_putc('\f');
while(true);
{
lcd_putc(num);
delay_ms(250);
num++;
}
} |
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Ttelmah
Guest
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| Posted: Fri Feb 27, 2009 2:55 pm |
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'num', is a binary value, starting at 0, and incrementing by one each time round the loop. 'putc', outputs a _single_ character. So, your code will print every possible character from 0 to 255.
Look at 'printf', which converts values into their ASCII format for output.
printf("%d\n\r",num);
Read the manual to work out what the other characters here are doing.
Best Wishes |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Feb 27, 2009 3:07 pm |
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Also, please don't start a new thread every time you have a new question
about displaying characters on an LCD. You already have an existing
thread on the topic, here:
http://www.ccsinfo.com/forum/viewtopic.php?t=37985
You can add new questions to the existing thread. |
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Guest
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| Posted: Fri Feb 27, 2009 3:50 pm |
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I tried the printf command but it is still not working. When I tried the printf it gave me the error STDOUT not defined (may be missing #use rs232). I know C and C++ programming so I understand what the notations are doing, I'm just new to this compiler and just need to get use to it.
| Code: | #include <18F4520.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#define LCD_POWER PIN_D7
#include "Flex_LCD.c"
#use rs232 //Do I need this
int num = 0;
//============================
void main()
{
output_high(LCD_POWER); // Turn on power to LCD
output_low(LCD_RW); // Set R/W pin on LCD to a low level
lcd_init(); // Initialize the LCD
lcd_putc('\f');
while(true);
{
printf("%d\n\r",num);
delay_ms(250);
num++;
}
} |
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Ttelmah
Guest
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| Posted: Fri Feb 27, 2009 3:52 pm |
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As I said, _read the manual_.
By default, all commands talk to STDIO. You want to talk to lcd_putc. Look at the entry for printf, and it shows how to do this.
Best Wishes |
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