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tag-eng
Joined: 28 Jul 2004
Posts: 6
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| displaying with LCD |
 Posted: Wed Aug 11, 2004 6:55 am |
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I am trying to output a variable in the LCD (using the PICDEM 2 Plus/16F877).
I understand how it is done in printf, but, having tried that to no avail I am kind of stuck. Here is my code:
| Code: |
#include <16F877.h>
#device adc=8
#use delay(clock=10000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,stream=RS232,bits=8)
#fuses NOWDT,RC, NOPUT, NOPROTECT, BROWNOUT
#use i2c(Master,sda=PIN_C4,scl=PIN_C3,RESTART_WDT,FORCE_HW)
#include <lcd_inc.c>
#include <stdio.h>
int outs;
int16 Temperature;
#int_TIMER1
TIMER1_isr() { //interrupt occurs every 2 seconds
outs = outs ^ 0x1; //toggle output bit
output_bit(PIN_B1, outs);
i2c_Start(); // Set a START condition I2C Bus
i2c_Write(0x10011010b); // Address and Write Flag
i2c_Write(0x00); // Temperature Register
i2c_Start(); // Set a START condition I2C Bus
i2c_Write(0x10011011b); // Address and Read Flag
Temperature = i2c_Read(); // Read Teperature
i2c_stop();
lcd_putc("\ftemp: ");
lcd_putc(Temperature);
output_bit(PIN_B0,outs);
printf("Temp: %ld",Temperature);
}
void main() {
lcd_init();
setup_timer_1(T1_EXTERNAL|T1_DIV_BY_1|0x8); //enable T1 for external clock, divide by 1
enable_interrupts(INT_TIMER1); //unmask timer1 overflow interrupt
enable_interrupts(global); //enable all unmasked interrupts
set_tris_c(0xff);
outs = 0x1; //preset output
while(1); //main does nothing
}
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thanks in advance for any help. |
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cbstieff
Joined: 09 Aug 2004
Posts: 7
Location: Kensington, MD
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| Posted: Wed Aug 11, 2004 8:40 am |
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| I believe that the CCS LCD driver will only work with LCDs that have a interface that is compatible with a HD44780 chip. The HD44780 interface bus has 14 pins. The LCD in the PICDEM 2 has 15 pins and I suspect that it is not compatible. You need to go to the Microchip web site and get a demo program for the PICDEM 2 that uses the LCD to see how to code the PICDEM LCD interface. |
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tag-eng
Joined: 28 Jul 2004
Posts: 6
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| Posted: Wed Aug 11, 2004 9:18 am |
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ah thanks, unfortuntly i have the code, and it is assembly code while i am working in c (and have no knowledge of assembly at all infact.)
but i am not using the CCS driver, i am using the driver that is in the code library and have been able to get the LCD to print something out, it just doesn't print out Temerature.
thanks |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Wed Aug 11, 2004 10:40 am |
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Replace this:
| Code: |
lcd_putc("\ftemp: ");
lcd_putc(Temperature);
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With this:
| Code: |
printf(lcd_putc,"\fTemp: %ld",Temperature);
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tag-eng
Joined: 28 Jul 2004
Posts: 6
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| Posted: Wed Aug 11, 2004 12:35 pm |
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| thanks a lot mark, that works |
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