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Excatter
Joined: 15 Nov 2013
Posts: 2
Location: Argentina
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| Communicating two PICs via the MRF89XA |
 Posted: Fri Nov 15, 2013 7:25 am |
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Hi to everyone,
I'm doing the final project of my career and when are using two PIC18LF2520 and two MRF89XA transceivers. We have made the two independent PCBS where to put the pics and the transceivers and they are working ok. We have bought the MRF89XAM8A integrated where it is the transceiver and also the antenna.
We configure the registers via the SPI and we can read the configurations correctly but when we want to communicate both transceivers via RF it doesn't work. We checked the signals with the oscilloscope (SPI signals) and they are fine. We don't know what the problem could be. Can anyone help us? We have been stuck in this problem for three weeks. This is the code we have made and we are using packet mode, FSK mode, SOFTWARE SPI.
Thank you very much,
Jhon Ignace
| Code: |
#include"C:\Users\Juan\Desktop\Proyecto\codigos\transmisor_prueba_2\main.h"
#include <float.h>
#include <math.h>
#use spi(DI=PIN_C4, DO=PIN_C5, CLK=PIN_C3,MODE=0,BAUD=25000,STREAM=cu)
#define DATOS PIN_C6
#define CONFIG PIN_C7
void configuracion(int8 a){
output_high(DATOS); // NO DATOS
output_low(CONFIG); // SI CONFIGURACION
if (a==0)
spi_xfer(cu,0x0090,16) ; // Para transmitir, se elige 868 Mhz, se usa R1,P1,S1
else
spi_xfer(cu,0x0070,16) ; // Para recepcion, se elige 868 Mhz, se usa R1,P1,S1
spi_xfer(cu,0x028C,16) ; // Se va a usar modo paquete y una trasmisión FSK
// Bit rate se dejó por default a 25 kbs
spi_xfer(cu,0x0C43,16); // El valor de R1 =67
spi_xfer(cu,0x0E35,16) ;// El valor de P1=53
spi_xfer(cu,0x1031,16) ;// El valor de S1 = 49
// Registros de configuración de recepción
spi_xfer(cu,0x2438,16) ;// Habilito bit de sincronización, tamaño de la palabra de sincronización=32 bis
// Se usa una potencia de transferencia igual a la default e igual a 10dbm
// Registros del control de paquete
spi_xfer(cu,0x3808,16);
spi_xfer(cu,0x028C,16) ; // Se va a usar modo paquete y una trasmisión FSK
}
void main()
{
configuracion(0); // 0 TX; 1 RX
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_CLOCK_DIV_2|ADC_TAD_MUL_0);
setup_spi(SPI_SS_DISABLED);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_oscillator(OSC_1MHZ|OSC_INTRC|OSC_31250|OSC_PLL_OFF);
set_tris_b(0b00000000); // PIN_B4 = LED
output_low(PIN_B4);
set_tris_c(0b00010110) ; // CSDATA,CCCON,SDO,SDI,SCK,IRQ1,IRQ0,RESET
output_high(PIN_B4);
for(;;){
// MAIN TX
output_low(DATOS); // DATOS
output_high(CONFIG); // NO CONFIGURACION
spi_xfer(cu,0xA5,8);
// to read from the rf communication we use:
// ref=spi_xfer(cu,0x00,8)
output_high(DATOS);
}
}
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temtronic
Joined: 01 Jul 2010
Posts: 9246
Location: Greensville,Ontario
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| Posted: Fri Nov 15, 2013 8:12 am |
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first thing I'd do is put 'MRF89XA' into the 'search' feature of this forum !
you'll get 4 or 5 hits...odds are good one of them should get you 'up and running'!
if not, google 'MRF89XA CCS C code' or similar and see what pops up.
hth
jay |
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asmboy
Joined: 20 Nov 2007
Posts: 2128
Location: albany ny
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| Posted: Fri Nov 15, 2013 9:59 am |
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have you tested using something like
what is in
AN1340
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Nov 16, 2013 1:35 am |
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| Quote: | #use spi(DI=PIN_C4, DO=PIN_C5, CLK=PIN_C3,MODE=0,BAUD=25000,STREAM=cu)
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You didn't specify the number of bits to send, so #use spi() will default to
sending 32 bits. Also, you didn't specify FORCE_HW, so it will default to
software SPI.
| Quote: | | setup_spi(SPI_SS_DISABLED); |
If you have a #use spi() statement, you should not have a setup_spi()
statement. #use spi is a newer method of setting the SPI. It can
be configured for hardware SPI (on the hardware pins) or for software
SPI on any suitable i/o pins. The setup_spi() function can only configure
the hardware SPI. Don't use both functions in the same program.
You should post this file so we can see your #fuses, etc.
| Quote: | | setup_oscillator(OSC_1MHZ|OSC_INTRC|OSC_31250|OSC_PLL_OFF); |
Do you really want to run the PIC at 1 MHz ? This means the instruction
clock is only 250 KHz. That's very slow.
Also, post your CCS compiler version. |
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Excatter
Joined: 15 Nov 2013
Posts: 2
Location: Argentina
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| Posted: Mon Nov 25, 2013 12:26 pm |
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| Thank you all for your answers. We manage to communicate both transceivers but now we have another problem. We manage to send one message but when we want to send more than one , the IRQ1, the interrupt that tells the pic that the payload is ready, never goes down. So, we cant receive more than one message. We have looked up for a solution in this forum but we couldnt find it. Can anyone help us? Please ask for anything you need in order to help us. |
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