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Mahdi
Joined: 21 Aug 2012
Posts: 47
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| Serial communication between 16f877a and 18f87k22 |
 Posted: Thu Dec 13, 2012 3:18 pm |
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Hi. I want to serial communicate between 16f877a and 18f87k22 but i have a problem. 16f877a is receiver and 18f87k22 is sender. When I want to send a variable, the receiver displays the wrong value. I use internal osc in 18f87k22. But when i use 16f877a for sender and receiver its working properly. I think the problem is the internal clock 18f87k22.
This is my code:
Sender:
| Code: |
#include <18F87K22.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES VREGSLEEP //Ultra low-power regulator is disabled
#FUSES INTRC_HP //LF-INTOSC in High-Power mode during Sleep
#FUSES SOSC_HIGH //High-power SOSC circuit is selected
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES INTRC_IO //Crystal osc <= 4mhz for PCM/PCH , 3mhz to 10 mhz for PCD
#FUSES PLLEN //4X HW PLL enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES NOPUT //No Power Up Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV18 //Brownout reset at 1.8V
#FUSES ZPBORM //Zero-Power BOR
#FUSES WDT_NOSLEEP //Watch Dog Timer, disabled during SLEEP
#FUSES WDT1048576 //Watch Dog Timer uses 1:1048576 Postscale
#FUSES RTCOSC_T1 //RTCC uses Secondary Oscillator as reference source
#FUSES EXTADDRSFT //External address is shifted to start at 0x000000
#FUSES ABW8 //8-bit Address bus
#FUSES BW16 //16-bit external bus mode
#FUSES NOWAIT //Wait selections unavailable for Table Reads or Table Writes
#FUSES ECCPE //Enhanced CCP PWM outpts multiplexed with RE6 thorugh RE3
#FUSES MSSPMSK7 //MSSP uses 7 bit Masking mode
#FUSES MCLR //Master Clear pin enabled
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES BBSIZ2K //2K words Boot Block size
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOCPB //No Boot Block code protection
#FUSES NOCPD //No EE protection
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES VREGSLEEP //Ultra low-power regulator is disabled
#FUSES INTRC_HP //LF-INTOSC in High-Power mode during Sleep
#FUSES SOSC_HIGH //High-power SOSC circuit is selected
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES XT //Crystal osc <= 4mhz for PCM/PCH , 3mhz to 10 mhz for PCD
#FUSES PLLEN //4X HW PLL enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES NOPUT //No Power Up Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV18 //Brownout reset at 1.8V
#FUSES ZPBORM //Zero-Power BOR
#FUSES WDT_NOSLEEP //Watch Dog Timer, disabled during SLEEP
#FUSES WDT1048576 //Watch Dog Timer uses 1:1048576 Postscale
#FUSES RTCOSC_T1 //RTCC uses Secondary Oscillator as reference source
#FUSES EXTADDRSFT //External address is shifted to start at 0x000000
#FUSES ABW8 //8-bit Address bus
#FUSES BW16 //16-bit external bus mode
#FUSES NOWAIT //Wait selections unavailable for Table Reads or Table Writes
#FUSES ECCPE //Enhanced CCP PWM outpts multiplexed with RE6 thorugh RE3
#FUSES MSSPMSK7 //MSSP uses 7 bit Masking mode
#FUSES MCLR //Master Clear pin enabled
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES BBSIZ2K //2K words Boot Block size
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOCPB //No Boot Block code protection
#FUSES NOCPD //No EE protection //No EE protection
#use delay(clock=4m)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,restart_wdt,errors)
#define use_portb_lcd TRUE
#define LCD_ENABLE_PIN PIN_b2
#define LCD_RS_PIN PIN_b0
#define LCD_RW_PIN PIN_b1
#define LCD_TYPE 2
#include <lcd.c>
void main()
{
int ad1=10,ad3=50,ad4=23,ad2=11;
lcd_init();
while(true)
{
putc(ad1);
putc(ad2);
putc(ad3);
putc(ad4);
lcd_gotoxy(1,1);
printf(lcd_putc,"ad1=%u",ad1);
lcd_gotoxy(9,1);
printf(lcd_putc,"ad2=%u",ad2);
lcd_gotoxy(1,2);
printf(lcd_putc,"ad3=%u",ad3);
lcd_gotoxy(9,2);
printf(lcd_putc,"ad4=%u",ad4);
delay_ms(20);
}
}
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REC CODE:
| Code: |
#include <16F877A.h>
#FUSES NOWDT
#FUSES HS
#FUSES NOPUT
#FUSES NOBROWNOUT
#FUSES NOLVP
#FUSES NOCPD
#FUSES NOWRT
#FUSES NODEBUG
#FUSES NOPROTECT
#use delay(clock=4m)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,restart_wdt,errors)
#define use_portb_lcd TRUE
#define LCD_ENABLE_PIN PIN_B2
#define LCD_RS_PIN PIN_B0
#define LCD_RW_PIN PIN_B1
#include <lcd.c>
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,restart_wdt,errors)
void main()
{
int ad1,ad2,ad3,ad4;
lcd_init();
while(true){
ad1=getc();
ad2=getc();
ad3=getc();
ad4=getc();
lcd_gotoxy(1,1);
printf(lcd_putc,"ad1=%u",ad1);
lcd_gotoxy(9,1);
printf(lcd_putc,"ad2=%u",ad2);
lcd_gotoxy(1,2);
printf(lcd_putc,"ad3=%u",ad3);
lcd_gotoxy(9,2);
printf(lcd_putc,"ad4=%u",ad4);
}
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Dec 13, 2012 7:41 pm |
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Did you look at your #fuses ? You have two full sets of fuses.
You have several different oscillator fuses.
Get rid of all your fuses. Try it with a simple set of fuses:
| Code: |
#include <18F87K22.h>
#fuses INTRC_IO,NOWDT,PUT,BROWNOUT,CCP2C1,SOSC_DIG,NOPLLEN
#use delay(clock=4M)
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Mike Walne
Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK
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| Posted: Fri Dec 14, 2012 2:43 am |
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What's the tolerance on the internal clock?
What's the frequency error that RS232 can tolerate?
(Both are covered in the microchip data sheets)
Mike |
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