problem I am not able to solve. please take a look

[wb505]

Two internet development board, A and B, with PIC18F6722 on both. On B board, I remove the transceiver for modem and added one more 232 chip as second rs232 RX2/RX2 port which are using G1 and G2 pins.

I connected A board RS232 RX1/TX1 port which are using C6 and C7 pins, to B board RS232 port RX2/TX2, which are using G1 and G2 pins. I want to use functions in EX_STISR.c to transmit data from B board to A board. What is weird is that, after compilation, the port, the data sent from board B, is always RS232 RX1/TX1 port and port RS232 RX2/TX2 was never used, no matter which code below I used:

// code 1
#int_tbe
void serial_isr() {
putc(t_buffer[t_next_out]);
t_next_out=(t_next_out+1) % T_BUFFER_SIZE;
if(t_next_in==t_next_out)
disable_interrupts(int_tbe);
}

void bputc(char c) {
short restart;
int ni;

restart=t_next_in==t_next_out;
t_buffer[t_next_in]=c;
ni=(t_next_in+1) % T_BUFFER_SIZE;
while(ni==t_next_out);
t_next_in=ni;
if(restart)
enable_interrupts(int_tbe);

// or code 2

#int_tbe2
void serial_isr() {
putc(t_buffer[t_next_out]);
t_next_out=(t_next_out+1) % T_BUFFER_SIZE;
if(t_next_in==t_next_out)
disable_interrupts(int_tbe2);
}

void bputc(char c) {
short restart;
int ni;

restart=t_next_in==t_next_out;
t_buffer[t_next_in]=c;
ni=(t_next_in+1) % T_BUFFER_SIZE;
while(ni==t_next_out);
t_next_in=ni;
if(restart)
enable_interrupts(int_tbe2);

can anyone tell me the reason?

Sorry, it should be EX_STISR.c, changed.

[Gerrit]

Hi wb505,

take a look at fputc(data, port);


gerrit

[wb505]

[jecottrell]

Look at streams and fputc().

What do your #use_rs232 declarations look like?

I think by default, if you don't declare a particular stream in a dual UART situation, the part will use UART1 which is C6 & C7.

John

[wb505]

[ckielstra]

You are not very quick in getting the hint do you?

People in this forum have the tendency not to give direct answers but to let you do some of the digging yourself, this will give you a learning experience in how to solve this type of problems so next time you will be able to help yourself.

[Guest]

Thanks you all! Now I got it. I'll try it.