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shalts
Joined: 20 Oct 2006
Posts: 17
Location: Ankara
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| DMX, couldn't get FERR, couldn't run INT_RDA |
 Posted: Sun Mar 28, 2010 3:56 pm |
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Dear Friends,
What I am trying to do is to make a start for DMX512.
I prepared an RS232 to RS485 converter board to let my computer be able to send me data @115000 BAUD, 8-N-2, when I press to keyboard from HyperTerminal.
Also I have a demo board with a PIC16F873 with 20Mhz xtal, and with a 2x8LCD, and an LED. When I use the codes (while both hyperterminal and PIC with same baud rates):
| Code: |
#use rs232(baud=115200, xmit=pin_c3, rcv=PIN_C7, enable=PIN_c5, STOP=2)
int a;
while()
{a=getc();
clr_disp(); //clears display before any write
lcd_gotoxy(1,2);
printf(lcd_putc,"A=%u",a);}
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I can see the values of each pressed key from the keyboard. This part works.
But when I changed only the baud rate of hyperterminal to 1200 to test if I can get the framing error from FERR, it doesn't work. Neither does INT_RDA(@same baud rates). Its been 2 days I couldn't find why. My code is as follows (without LCD part):
| Code: |
#include <16F873.h>
#device adc=8
#use delay(clock=20000000)
#fuses hs,nowdt,noPROTECT,NOBROWNOUT
#use rs232(baud=115200, xmit=pin_c3, rcv=PIN_C7, enable=PIN_c5, STOP=2) //
#byte RCSTA = 0x18
#byte RCREG = 0x1A
#byte PIR1 = 0x0C
#bit FERR = RCSTA.2
#bit RCIF = PIR1.5
#define led pin_b0
int a;
void main()
{
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
output_high(led);
delay_ms(500);
output_low(led);
while(1)
{
if(FERR==1)
{
output_high(led);
delay_ms(1000);
output_low(led);
delay_ms(1000);
a=getc();
}
}
}
#INT_RDA
receiver()
{
output_high(led);
delay_ms(50);
output_low(led);
delay_ms(50);
a=getc();
}
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I would appreciate any help about how to get a FERR and how to make the RDA work please.
Regards,
Shalt
_________________
Murat Shalt Unal |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Mar 28, 2010 10:50 pm |
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| Quote: |
#include <16F873.h>
#use rs232(baud=115200, xmit=pin_c3, rcv=PIN_C7, enable=PIN_c5, STOP=2)
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You're using a software UART. To use the hardware UART, you must
specify pins C6 and C7. Any other pins will give you a software UART.
The hardware FERR bit is only valid if you use the hardware UART. |
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shalts
Joined: 20 Oct 2006
Posts: 17
Location: Ankara
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| Posted: Mon Mar 29, 2010 7:38 am |
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Dear PCM Programmer ,
Thank you very much for your reply. You helped me a lot. I solved the problem . Can get FERR, OERR now. I runned a simple DMX receiver also.
Best Regards,
Shalt
_________________
Murat Shalt Unal |
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spradecom.rnd
Joined: 27 Apr 2010
Posts: 16
Location: Mumbai
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| Posted: Thu Aug 05, 2010 4:38 am |
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| Can any one send me working DMX receiver code. I am using PIC16F1938. I have tried several routine but no use. email spradecom.rnd@gmail.com |
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