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Paradoxz
Joined: 08 Sep 2011
Posts: 1
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| RF Transmitter and Receiver |
 Posted: Thu Sep 08, 2011 8:07 pm |
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Hi everyone, this is my first post here and I am looking for a little help. I have a PIC16F690 that is transmitting properly over RS232. I can use my Arduino connected to my RF receiver to verify this. I can not for the life of me get another one of my PIC16F690's to work as a receiver though.
WRL-10535 Transmitter http://www.sparkfun.com/products/10535
WRL-10533 Receiver http://www.sparkfun.com/products/10533
PIC16F690 Datasheet: http://ww1.microchip.com/downloads/e...Doc/41262c.pdf
Arduino Uno
Here is the working code: (16F690 Counting from 0-20 repeatedly)
| Code: |
// The 16F690 in CCSC as Transmitter (Working)
#include <16F690.H>
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#fuses INTRC_IO, NOWDT, NOPROTECT, NOBROWNOUT, PUT
#use delay(clock=4000000)
#use rs232(baud=4800, xmit=PIN_C2, rcv=PIN_A0)
int value;
int count;
main() {
output_high(PIN_A2);
value = "0";
while(1) {
count = 0;
while(count < 20) {
if(value > 20) {
value = 0;
}
printf("%c", value);
count++;
}
value++;
}
} |
Any here is the working code on the Arduino, as a receiver.
// Arduino Uno as Receiver (Working)
| Code: | int incomingByte = 0;
void setup(){
Serial.begin(4800);
}
void loop(){
incomingByte = Serial.read();
Serial.println(incomingByte, DEC);
} |
Here is my attempt to use the PIC16F690 as a receiver. Any suggestions on why it isn't working? I get a reading, but it's just a mess of numbers.
| Code: |
// Trying to use CCSC W/ 16F690 as Receiver (Not Working)
#include <16F690.H>
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#fuses INTRC_IO, NOWDT, NOPROTECT, NOBROWNOUT, PUT
#use delay(clock=4000000)
#use rs232(baud=4800, xmit=PIN_A0, rcv=PIN_B5)
int value;
main() {
while(1) {
value = getc();
printf("%d", value);
printf("\n");
}
} |
It might help to add I have tried getc, getch, getchar and have tried assigning a stream to RS232. This should not matter though since it is two different PIC's (one as tx and one as rx). There is only one RS232 in use on each. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Sep 08, 2011 9:52 pm |
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| Quote: |
#use rs232(baud=4800, xmit=PIN_A0, rcv=PIN_B5)
while(1) {
value = getc();
printf("%d", value);
printf("\n");
}
|
You're using a software UART. The hardware pins are B7 and B5
(Tx and Rx). Both pins must be specied as the hardware pins in order
for the compiler to generate code for a hardware UART.
When your code is printing the value and the newline, it can't be polling
the software UART's Rx pin. But polling the pin is required for a
software UART to work properly.
Just as a test, you could add a 10ms delay between characters on
transmitter side.
Or, you could change to a hardware UART, and also add a interrupt-
driven receive fifo (circular buffer) to your program. See the CCS
example file, Ex_sisr.c. |
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