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pic18f67k40 uart problem ...help !

 
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kmwkjj



Joined: 12 Dec 2018
Posts: 1
Location: BUSAN/KOREA

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pic18f67k40 uart problem ...help !
PostPosted: Wed Dec 12, 2018 6:05 am     Reply with quote
MCU: 18f67k40

I want to use 3 UARTs.
UART1 and UART2 have no problems.
UART3 has a problem.

Setting UART3 together with the corresponding source causes a problem in UART2 and UART3.

I want to use both UART1, UART2, and UART3.

UART1, UART2, and UART3 are all connected to the hardware pins.

PLZ Help

Code:
------------- xx.h ------------------------
#include <18F67K40.h>         
#device *=16 adc=10
#use delay(clock = 4000000)

#pin_select U1TX = PIN_C6
#pin_select U1RX = PIN_C7
#pin_select U2TX = PIN_G1
#pin_select U2RX = PIN_G2
#pin_select U3TX = PIN_E0
#pin_select U3RX = PIN_E1

#use rs232 (uart1, baud = 9600, ERRORS, STREAM = g_Stream_SP)                     
#use rs232 (uart2, baud = 9600, ERRORS, STREAM = g_Stream_Angle)                 
#use rs232 (uart3, baud = 9600, ERRORS, STREAM = g_Stream_Remote)             

#zero_ram

#FUSES XT

       
#BYTE PORTA = 0x0F89
#BYTE PORTB = 0x0F8A
#BYTE PORTC = 0x0F8B
#BYTE PORTD = 0x0F8C
#BYTE PORTE = 0x0F8D
#BYTE PORTF = 0x0F8E
#BYTE PORTG = 0x0F8F
#BYTE PORTH = 0x0F90


#BYTE TRISAA = 0x0F81
#BYTE TRISAB = 0x0F82
#BYTE TRISAC = 0x0F83
#BYTE TRISAD = 0x0F84
#BYTE TRISAE = 0x0F85
#BYTE TRISAF = 0x0F86
#BYTE TRISAG = 0x0F87
#BYTE TRISAH = 0x0F88


Code:

------------- xx.c ------------------------
#include "xx.h"

#int_rda
void rda_isr()
{
    int8 rx_data;
    rx_data = getch(g_Stream_SP);
}

#int_rda2
void rda2_isr()
{
    int8 rx_data;
    rx_data = getch(g_Stream_Angle);
}

#int_rda3
void rda3_isr()
{
    int8 rx_data;
    rx_data = getch(g_Stream_Remote);     

main()
{
    enable_interrupts(INT_RDA);
    enable_interrupts(INT_RDA2);
    enable_interrupts(INT_RDA3);
    enable_interrupts(global);
   
    set_tris_a(0b00111000);
    set_tris_b(0b00001111);
    set_tris_c(0b10000000);
    set_tris_d(0b00000000);
    set_tris_e(0b11110010);
    set_tris_f(0b00000000);
    set_tris_g(0b00000100);
    set_tris_h(0b00001111);

    SETUP_ADC_PORTS( ALL_DIGITAL );   
    porta = 0x00;
    portb = 0x00;
    portd = 0x00;
    porte = 0x00;
    portg = 0x00;
    portg = 0x00;

   while(1)
   {
        .....
    }
}
temtronic



Joined: 01 Jul 2010
Posts: 9093
Location: Greensville,Ontario

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PostPosted: Wed Dec 12, 2018 6:27 am     Reply with quote
while I don't use that PIC...some comments..

you need to post your compiler version...

need some more information to narrow down what's happening.

1) does UART #3 work by itself?

2)does UART #1 and #3 work together ?

3) does UART #2 and #3 work together ?

is it ONLY the combination of all 3 UARTs that it fails ?

Jay
Ttelmah



Joined: 11 Mar 2010
Posts: 19215

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PostPosted: Wed Dec 12, 2018 9:21 am     Reply with quote
Also, what is posted, will cause issues:

1) No closing bracket on the RDA3 handler.
2) No actual way of seeing what has been received.
Data is only being retrieved inside the interrupt handler. If you test this with
a debugger, the processor will be halting inside the handler, so won't be
able to handle the other ports. Result lost data....

There is also a potential issue with the stream names. They really need to
be upper case. Now you don't show whether you use #CASE, but if you
are there will be problems using mixed case stream names.
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