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Using a simple CAN BUS protocol example.

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sonyoungdong

Joined: 06 Oct 2013
Posts: 4

Using a simple CAN BUS protocol example.

Posted: Fri Nov 15, 2013 6:28 am

Hi, I'm making a simple example code based on the example file of CCS, "EX_CAN.c". I am using PICF4580. My code is as below.

Code:

#include "set4580.h"
#include "can-18F4580.h"
#byte p_d = 0xf83
#byte PIR1 = 0xf9e
int8 count;

#int_timer2
void isr_timer2(void) {
bit_clear(PIR1,1);
count++; //keep a running timer that increments every milli-second
}

void main() {
struct rx_stat rxstat; //구조체 정의는 어디서?
int32 rx_id;
int in_data[8];
int rx_len;

//send a request (tx_rtr=1) for 8 bytes of data (tx_len=8) from id 24 (tx_id=24)
int out_data[8];
int32 tx_id=24;
int1 tx_rtr=1;
int1 tx_ext=0;
int tx_len=8;
int tx_pri=3;

int i;

for (i=0;i<8;i++) {
out_data[i]=0;
in_data[i]=0;
}

printf("\r\n\r\nCCS CAN EXAMPLE\r\n");

setup_timer_2(T2_DIV_BY_16,255,16); //1초마다 발생.

can_init();//Initializes PIC18xxx8 CAN peripheral.

enable_interrupts(INT_TIMER2); //enable timer2 interrupt
enable_interrupts(GLOBAL); //enable all interrupts (else timer2 wont happen)

printf("\r\nRunning...");

while(TRUE)
{
//Data receive
if ( can_kbhit() ) //if data is waiting in buffer...
{
if(can_getd(rx_id, &in_data[0], rx_len, rxstat)) { //...then get data from buffer
printf("\r\nGOT: BUFF=%U ID=%LU LEN=%U OVF=%U ", rxstat.buffer, rx_id, rx_len, rxstat.err_ovfl);
printf("FILT=%U RTR=%U EXT=%U INV=%U", rxstat.filthit, rxstat.rtr, rxstat.ext, rxstat.inv);
printf("\r\n DATA = ");
for (i=0;i<rx_len;i++) {
printf("%X ",in_data[i]);
}
printf("\r\n");
}
else {
printf("\r\nFAIL on GETD\r\n");
}

}

//every two seconds, send new data if transmit buffer is empty
if ( can_tbe() && (count > 153))
{
count=0;
i=can_putd(tx_id, out_data, tx_len,tx_pri,tx_ext,tx_rtr); //put data on transmit buffer
if (i != 0xFF) { //success, a transmit buffer was open
printf("\r\nPUT %U: ID=%LU LEN=%U ", i, tx_id, tx_len);
printf("PRI=%U EXT=%U RTR=%U\r\n DATA = ", tx_pri, tx_ext, tx_rtr);
for (i=0;i<tx_len;i++) {
printf("%X ",out_data[i]);
}
printf("\r\n");
}
else { //fail, no transmit buffer was open
printf("\r\nFAIL on PUTD\r\n");
}
}
}
}

Ignore some Korean comments Very Happy

EX_CAN.C file is a source file and this includes head files can-18F4580.h, set4580.h(Default setting file for rom writing). And can-18F4580.h includes can-18F4580.c.
I am writing this list because I am not sure whether this header files are right or not.
Anyway, when I tried to test this CODE using USB-to-CAN with Minimon program, no data is received and transmitted....
I don't know what problem exists in my code.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Fri Nov 15, 2013 11:52 pm

Post the contents of this file:

Quote:

#include "set4580.h"

Post a link to the schematic of your PIC board. Post your compiler version.

sonyoungdong

Joined: 06 Oct 2013
Posts: 4

About set4580

Posted: Tue Nov 19, 2013 5:54 am

set4580.h

Code:

#include <18F4580.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES H4 //High speed osc with HW enabled 4X PLL
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV21 //Brownout reset at 2.1V
#FUSES NOPUT //No Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES LVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES PBADEN //PORTB pins are configured as analog input channels on RESET
#FUSES BBSIZ2K //2K words Boot Block size
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES LPT1OSC //Timer1 configured for low-power operation
#FUSES MCLR //Master Clear pin enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#use delay(clock=40000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

18F4580.h

Code:

//////// Standard Header file for the PIC18F4580 device ////////////////
#device PIC18F4580

[header file deleted]

Version is 4.068
thank you for your interest

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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Tue Nov 19, 2013 12:13 pm

Quote:

I'm making a simple example code based on the example file of CCS, "EX_CAN.c".

Anyway, when I tried to test this CODE using USB-to-CAN with Minimon
program, no data is received and transmitted....

Ex_Can.c is written to work with the CCS CAN Bus Development kit:
http://www.ccsinfo.com/product_info.php?products_id=CANbuskit
The program is designed to work with the MCP25050 CAN Bus i/o
expander chips:
http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010402

You are not using an MCP25050, so I think you need to make the
changes listed below:

Comment out the two lines shown below, and substitute the new
initialization lines shown after them:

Code:

// int1 tx_rtr=1;
// int1 tx_ext=0;

int1 tx_rtr=0; // *** Changed to 0
int1 tx_ext=1; // *** Changed to 1

Also there are some problems with your #fuses:

Quote:

#FUSES NODEBUG //No Debug mode for ICD
#FUSES LVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES PBADEN //PORTB pins are configured as analog input channels on RESET

Change the first one in bold to NOLVP. I doubt that you are using a Low
voltage programmer. Those programmers are hand-built from
instructions on hobbyist websites. Almost everyone uses a normal
programmer, which should use NOLVP.
Also, I don't see that you are using PortB as analog inputs, so it's best
to keep PortB as digital i/o. Change the next fuse in bold to NOPBADEN.

Quote:

#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

Also, ideally the #use rs232() line should always have the ERRORS
parameter as shown below:

Code:

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

The compiler defaults to 8 bits and No parity. You don't need to specify it.

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