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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Thu Feb 19, 2009 7:22 pm |
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If this program doesn't work, when typing characters in a serial terminal
window on your PC, then I'd say there is something wrong with your
hardware.
| Code: | #include <18F2550.h>
#fuses HS, NOWDT, PUT, NOBROWNOUT, NOLVP
#use delay(clock=20000000)
#use rs232(baud=57600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
//==========================
void main()
{
char c;
while(1)
{
c = getc(); // Get char from PC
putc(c); // Send it back to the PC
}
} |
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Guest
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| Posted: Sat Feb 21, 2009 7:35 am |
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Hi,
I hope you can help me. I used the echo routine you posted and I am able to echo character keypresses. The problem is that the characters echoed is not character that was pressed (mostly 0XFAs).
This is on a 16F690 using the internal oscillator. The exact code I am using is as follows:
| Code: |
#include <16F690.h>
#fuses HS, NOWDT, PUT, NOBROWNOUT,INTRC_IO
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, parity=N, rcv=PIN_C7, ERRORS)
//==========================
void main()
{
char c;
setup_oscillator(OSC_4MHZ); /* tried this with and without */
while(1)
{
c = getc(); // Get char from PC
putc(c); // Send it back to the PC
}
}
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I suspect that this is a clock/timing issue but I am at a loss what to do next.
TIA |
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agimat
Joined: 09 Feb 2009
Posts: 1
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| Solved |
| Posted: Sat Feb 21, 2009 1:31 pm |
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Replaced
#use delay(clock=20000000)
with
#use delay(clock=8000000)
I was using the 16F690's internal clock at 8Mhz.
That fixed it.
_________________
http://rlachenal.com |
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Ttelmah
Guest
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| Posted: Sat Feb 21, 2009 3:01 pm |
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Also, as a 'comment', get rid of the HS fuse at the start of the fuse line.
You can't select both the HS (high speed crystal) oscillator, and the internal RC oscillator. On some chips, selecting multiple setups like this, will stop it working at all, it is just 'luck' that it is working.
Best Wishes |
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obarcia
Joined: 14 May 2009
Posts: 1
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| serial rs232 reading problem (problema resuelto) |
| Posted: Thu May 14, 2009 4:06 pm |
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Esta es una solución que alguna vez utilice en la serie de PIC 16Fxxx, leyendo los comentarios de todos ustedes compañeros, he llegado hacer funcionar el PIC18F2550, también tuve problema con la RX (el usart y SPI ) están sobre el mismo pin, borrando esa línea de código setup_spi(SPI_SS_DISABLED) funcionó (PCM programmer), gracias a todos ustedes porque también me sirvió la ayuda de todos ustedes.
| Code: | #include <18F2550.h>
#device adc=8
#use delay(clock=20000000)
#use rs232(baud=57600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
//------------------------- Variables Globales -------------------------\\
char C='f';
//---------------------------INTERRUPCIONES-----------------------------\\
#int_RDA
void serial_isr() { // Interrupción recepción serie USART
C=0x00; // Inicializo caracter recibido
if(kbhit()){ // Si hay algo pendiente de recibir ...
C=getc(); // lo descargo y ...
}
printf("char: ");
putc(c);
printf("\r\n");
}
//----------------------PROGRAMA PRINCIPAL-------------------------------\\
void main()
{
enable_interrupts(INT_RDA);
enable_interrupts(global);
// TODO: USER CODE!!
printf("Test: ");
putc(c);
printf("\r\n");
while(true)
{
}
} |
Solo lo he simulado para este pic18f2550, pero en la serie 16Fxxx si lo he cargado al pic y ha funcionado
obarcia
MONTECRISTI-MANABI-ECUADOR |
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