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cmesparza
Joined: 03 Jan 2012
Posts: 4
Location: Pamplona
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| PIC18F27J53 second UART not working [SOLVED] |
 Posted: Tue Jan 03, 2012 6:14 pm |
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Hi everyone,
I write because I'm having some problems in a project involving two UARTs.
One of it is for bluetooth communications (already working) and the other one is to communicate with another MCU.
Here is part of the code:
| Code: |
#include <pruebas.h>
#int_RDA2
void RDA_isr(void)
{
unsigned int dato;
dato=fgetc(IMU); //Recogemos dato recibido.
ang=dato;
}
#int_RDA
void RDA2_isr(void)
{
unsigned int dato;
dato=fgetc(BT); //Recogemos dato recibido.
//do something
}
void main()
{
//CONFIG BITS
setup_adc_ports(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_2);
set_timer0(5535);
clear_interrupt(INT_TIMER1);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
set_timer1(41535);
clear_interrupt(INT_TIMER1);
setup_timer_2(T2_DIV_BY_16,255,3);
set_timer2(0x00);
clear_interrupt(INT_TIMER1);
setup_timer_3(T3_INTERNAL|T3_DIV_BY_1);
set_timer3(41535);
clear_interrupt(INT_TIMER1);
setup_timer_4(T4_DIV_BY_16,255,3);
set_timer4(0x00);
clear_interrupt(INT_TIMER1);
set_tris_a(0x00);
set_tris_b(0x01);
set_tris_c(0x80);
output_b(0x00);
setup_comparator(NC_NC_NC_NC);// This device COMP currently not supported by the PICWizard
enable_interrupts(INT_TIMER0);
enable_interrupts(INT_RDA);
enable_interrupts(INT_RDA2);
enable_interrupts(GLOBAL);
//PROGRAMA DE INICIALIZACIÓN
fprintf(BT,"Comunicaciones establecidas \n\r"); //Imprime en panatalla UART Conectada
//PROGRAMA PRINCIPAL
while(1)
{
}
}
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And the header file pruebas.h:
| Code: |
#include <18F27J53.h>
#device ICD=TRUE
#device adc=16
#fuses NOWDT, PLL2, PLLEN, STVREN, NOXINST, DEBUG, NOCPUDIV, NOPROTECT, INTRC_PLL, NOCLOCKOUT, SOSC_LOW, NOFCMEN, NOIESO, WDT2048, NODSWDT, NOIOL1WAY, LS48MHZ
#use delay(clock=48MHz)
#USE FAST_IO (A)
#USE FAST_IO (B)
#USE FAST_IO (C)
#use rs232(UART1,baud=460800,parity=N,bits=8,ERRORS,stream=BT)
#use rs232(UART2,baud=230400,parity=N,xmit=PIN_B1,rcv=PIN_B0,bits=8,ERRORS,stream=IMU)
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The second UART is not working.
As I have said, bluetooth is already working on UART1, but if I connect it to UART2 (to check if it works, changing the baud rate at #use rs232), when sending "Comunicaciones establecidas \n\r" to a terminal, only "omunicaciones establecidas \n\r" is shown and nothing is received.
I wonder if I'm really using the hardware UART. Is correctly configured? Is CCS automatically mapping pins B1 and B0?
Someone could help me?
Thanks in advance for your help,
Happy new year everyone!
P.S.: I'm using CCS 4.120
_________________
CME Ingeniería
www.cmeingenieria.es
Last edited by cmesparza on Wed Jan 04, 2012 4:16 am; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Jan 03, 2012 7:13 pm |
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This thread may help. Use #pin_select to set the pins for UART2, and
set the TX2 pin to be an output pin.
http://www.ccsinfo.com/forum/viewtopic.php?t=45883
I haven't tested this, but it sounds reasonable based on that thread. |
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cmesparza
Joined: 03 Jan 2012
Posts: 4
Location: Pamplona
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| SOLVED! |
| Posted: Wed Jan 04, 2012 4:16 am |
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Thank you so much, is working now!
I didn't know anything about #pin_select directive...
just changing:
| Code: |
#PIN_SELECT RX2=PIN_B0
#PIN_SELECT TX2=PIN_B1
#use rs232(UART1,baud=460800,parity=N,bits=8,ERRORS,stream=BT)
#use rs232(UART2,baud=460800,parity=N,bits=8,ERRORS,stream=IMU)
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and all done.
Thanks again.
_________________
CME Ingeniería
www.cmeingenieria.es |
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