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cura
Joined: 27 May 2006
Posts: 2
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| Connecting two PIC16F84A using RS-232 |
 Posted: Sat May 27, 2006 5:58 am |
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Is it possible to connecto two 16f84a using the rs-232 protocol? I'm trying to do it but what I get is that there is no transmission/reception.
I want to use a single wire (in one pic as rx channel, in the other as tx channel).
Is there any place where I can find an example of this two PIC connection?
THANK YOU! |
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Sat May 27, 2006 7:25 am |
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You can do it connecting Tx pin of one PIC to the Rx pin of the other PIC directly.
| Quote: |
Is there any place where I can find an example of this two PIC connection?
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...........?
Humberto |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Sat May 27, 2006 8:25 am |
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| Ever think that maybe your code might be the problem? Post what you have and make sure that you use the "Code" button. |
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cura
Joined: 27 May 2006
Posts: 2
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| Posted: Sat May 27, 2006 9:31 am |
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This is the code, it is just a remote control for 10 channels. What I want that the Rx PIC copies exactly the channel configuration in the Tx PIC.
For the Rx PIC
| Code: |
#case
#include <16F84A.H>
#include <defs_f84.h> // registers and bits
#include <STDLIB.H>
#fuses xt,nowdt,put,noprotect
#define RS232_XMIT PIN_A1 //Pin de transmision
#define RS232_RCV PIN_A1 // Pin de recepcion (sera el mismo que transmision)
#use delay(clock=4000000) // 4 MHz OSC
#use rs232(baud=1200,xmit=NULL, rcv=RS232_RCV)
int canales[2];
void main(void) {
trisa1=1; //Receiving Pin
trisb0=0;
trisb1=0;
trisb2=0;
trisb3=0;
trisb4=0;
trisb5=0;
trisb6=0;
trisb7=0;
trisa2=0;
trisa3=0;
trisa0=0;
//Setting Channels
output_low(PIN_B7);
output_low(PIN_B6);
output_low(PIN_B5);
output_low(PIN_B4);
output_low(PIN_B3);
output_low(PIN_B2);
output_low(PIN_B1);
output_low(PIN_B0);
output_low(PIN_A3);
output_low(PIN_A2);
while(1){
canales[0]=getchar();
canales[1]=getchar();
if(bit_test(canales[0], 0)){
output_high(PIN_B7);
}
else output_low(PIN_B7);
if(bit_test(canales[0], 1)){
output_high(PIN_B6);
}
else output_low(PIN_B6);
if(bit_test(canales[0], 2)){
output_high(PIN_B5);
}
else output_low(PIN_B5);
if(bit_test(canales[0], 3)){
output_high(PIN_B4);
}
else output_low(PIN_B4);
if(bit_test(canales[0], 4)){
output_high(PIN_B3);
}
else output_low(PIN_B3);
if(bit_test(canales[0], 5)){
output_high(PIN_B2);
}
else output_low(PIN_B2);
if(bit_test(canales[0], 6)){
output_high(PIN_B1);
}
else output_low(PIN_B1);
if(bit_test(canales[0], 7)){
output_high(PIN_B0);
}
else output_low(PIN_B0);
if(bit_test(canales[1], 0)){
output_high(PIN_A3);
}
else output_low(PIN_A3);
if(bit_test(canales[1], 1)){
output_high(PIN_A2);
}
else output_low(PIN_A2);
delay_ms(15);
}
} // end of main
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For the TX PIC:
| Code: |
#case
#include <16F84A.H>
#include <defs_f84.h> // registers and bits
#include <STDLIB.H>
#fuses xt,nowdt,put,noprotect
#define RS232_XMIT PIN_A1 //Transmitter pin
#define RS232_RCV PIN_A0
#use delay(clock=4000000) // 4 MHz OSC
#use rs232(baud=1200, xmit=RS232_XMIT, rcv=NULL)
int canales0;
int canales1;
void read_ch(void){
if (input(PIN_A2)){
bit_set(canales1,1);
}
if (input(PIN_A3)){
bit_set(canales1,0);
}
if (input(PIN_B0)){
bit_set(canales0,7);
}
if (input(PIN_B1)){
bit_set(canales0,6);
}
if (input(PIN_B2)){
bit_set(canales0,5);
}
if (input(PIN_B3)){
bit_set(canales0,4);
}
if (input(PIN_B4)){
bit_set(canales0,3);
}
if (input(PIN_B5)){
bit_set(canales0,2);
}
if (input(PIN_B6)){
bit_set(canales0,1);
}
if (input(PIN_B7)){
bit_set(canales0,0);
}
}
void send_data(void) {
putchar(canales0);
delay_ms(50);
putchar(canales1);
}
void main(void) {
trisa1=0; //tx pin
trisb0=1; // channels
trisb1=1;
trisb2=1;
trisb3=1;
trisb4=1;
trisb5=1;
trisb6=1;
trisb7=1;
trisa1=1;
trisa2=1;
trisa3=1;
while(1){
read_ch();
send_data();
delay_ms(100);
}
} // end of main
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The data will only travel from Tx to Rx, this means that no feedback from the receptor is needed in the transmitter for the application in order to work.
THANKS!!! |
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dyeatman
Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK
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