Hi,
I've a problem: I'm trying to connect my pic16f887 to my pc over rs232
(with max232, which worked when using JAL).
This is the code:
#define __16f887
#include "pic14/pic16f887.h"
//#include "usart.h"
#ifndef KHZ
#define KHZ 8000
#endif
// These are fixed. The 16f628a can only use these as transmit and
recieve.
#define TX_PORT 2
#define RX_PORT 1
#define TX_BIT (1<<TX_PORT)
#define RX_BIT (1<<RX_PORT)
// Twiddle these as you like BUT remember that not all values work
right!
// See the datasheet for what values can work with what clock
frequencies.
#define BAUD 19200
#define BAUD_HI 1
// This section calculates the proper value for SPBRG from the given
// values of BAUD and BAUD_HI. Derived from Microchip's datasheet.
#if (BAUD_HI == 1)
#define BAUD_FACTOR (16L*BAUD)
#else
#define BAUD_FACTOR (64L*BAUD)
#endif
#define SPBRG_VALUE (unsigned
char)(((KHZ*1000L)-BAUD_FACTOR)/BAUD_FACTOR)
//Use these configuration words:
//0x2ff4 0x3fff
//Set the configuration words:
unsigned int __at _CONFIG1 configWord1 = 0x2FF4;
unsigned int __at _CONFIG2 configWord2 = 0x3fff;
//Setup variables
unsigned int ucharCount = 0;
unsigned int uintDelayCount = 0;
unsigned int i;
char recvd = 0;
void delay(void)
{
//Delay Loop
while ( uintDelayCount < 15000 )
{
//Increment the loop counter
uintDelayCount++;
}
//Reset delay loop counter
uintDelayCount = 0;
}
void stdio_init()
{
//init_serie();
}
void main(void)
{
//stdio_init();
//Set PORTC to all outputs
TRISD = 0x00;
//OSCTUNE = 0x1f;
uintDelayCount = 0;
PORTD = 0;
TRISB=TX_BIT|RX_BIT; // These need to be 1 for USART to work
SPBRG=SPBRG_VALUE; // Baud Rate register, calculated by macro
BRGH=BAUD_HI;
SYNC=0; // Disable Synchronous/Enable Asynchronous
SPEN=1; // Enable serial port
TXEN=1; // Enable transmission mode
CREN=1; // Enable reception mode
while(1)
{
while(!RCIF); // Wait until data recieved
i=RCREG; // Store for later
PORTD=2;
delay();
while(!TRMT); // Wait until we're free to transmit
TXREG=i+1; // Transmit
PORTD=0;
}
}
Simple enough, I can connect through putty to ttyUSB0 (is USB the
problem? using profilic adapter) and send commands for about 10 seconds
(like 'a', 1, '3'). It doesn't return anything though and the LED (RD1)
Stops flashing after that time, which turned up every time I pressed a
butten before those 10 sec.
What am I doing wrong?
Ruben De Smet
PS. sorry for my bad English :)
PPS. I hope this is the right place to drop my question...
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