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Pichuqy_1
Joined: 03 Aug 2010
Posts: 38
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| PIC18F4550 + LCD |
 Posted: Wed Sep 05, 2012 1:44 pm |
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Hi! I have a big problem. I'm trying to use this microcontroller with a graphic lcd but it doesn't work. I don't know why. I'd tried with everything, if I use the same code with other pic it does works perfectly. I'm using a 12 MHz crystal. Can someone help me please?
| Code: | #include "18F4550.h"
#device adc=10
#fuses HSPLL,MCLR,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL3,CPUDIV1,NOVREGEN,NOPBADEN
#use delay(clock=48000000)
#define _HDM64GS12_modificada
#define GLCD_CS1 PIN_E0
#define GLCD_CS2 PIN_E1
#define GLCD_DI PIN_E2
#define GLCD_E PIN_D0
#define GLCD_RW PIN_D1
#define GLCD_RST PIN_D2
#include <HDM64GS12_modificada.h>
#include <GRAPHICS_modificada.c>
char valor_date[10];
char valor_lm35[5];
char segundo[3];
long medicion;
char configuracion_hora[ ]="Configurar HORA --> *";
int cont=0,un_segundo=0;
int cambio=0;
void main(void)
{
setup_timer_1(T1_INTERNAL | T1_DIV_BY_8);
set_timer1(0);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
setup_adc_ports (AN0);
setup_adc (ADC_CLOCK_INTERNAL);
set_adc_channel(0);
delay_us(10);
#rom int8 0xF00004={'1','2','3','4'};
glcd_init(ON,SelGLCD_1);
glcd_text57(0,57,configuracion_hora,1,1,SelGLCD_1);
do{
glcd_text57(0,57,configuracion_hora,1,1,SelGLCD_1);
}while(TRUE);
} |
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ezflyr
Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA
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| Posted: Wed Sep 05, 2012 2:25 pm |
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Hi,
It looks like your #use delay statement and/or your fuses are incorrect for
the crystal you indicate. I would connect an LED (thru a suitable current
limiting resistor) to one of the PIC I/O pins, and try to flash it at a
predictable rate, say 1 second ON, and 1 second OFF. I think you'll find it's
not predictable with your current settings, and crystal combination.
John |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19553
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| Posted: Thu Sep 06, 2012 2:16 am |
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The clocks look OK.
On the 4550, you have the choice of running the CPU, from the USB PLL, or from the main oscillator. This is controlled by selecting HS or HSPLL (the PLL _always_ runs).
So HSPLL, is saying take the master oscillator from the USB PLL.
This PLL requires a 4MHz input, so 'PLL3' (clock coming in/3 feeds the PLL).
Then CPUDIV1, says take the USB clock/2 (the CCS naming is really annoying, since the actual 'divisor' given is different when running from the external crystal, and the USB PLL), with CPUDIV1, giving /1 from the main crystal, or /2 from the USB PLL. CPUDIV2 gives /2 from the main crystal, but /3 from the USB PLL etc...
The USB PLL, gives 96MHz, so the fuses as specified should give 48MHz operation.
However the code is extremely messy (things like #ROM statements to program the EEPROM, in the middle of the main routine - uurgh).
I'd guess:
1) MCLR?.
2) (Most likely), not turning off the other peripherals on the pins being used. Streaming parallel port is on these pins.
3) General comment, is ADC_CLOCK_INTERNAL, legal at 48MHz?. (no it isn't - select the recommended clock).
Best Wishes |
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