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johns_sd
Joined: 19 Jan 2015
Posts: 3
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| CAN issue (pin selection?) on 24HJ64GP504 CANBUS [SOLVED] |
 Posted: Mon Jan 19, 2015 5:24 pm |
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Hi, I'm having trouble getting any output from the CAN module on a 24HJ64GP504. After digging around a bit on here, I have this much:
Header:
| Code: | #include <24HJ64GP504.h>
#device *=16
#device ICD=TRUE
#use delay(clock=20000000, osc) // OSC turns on external oscillator input instead of RC
#define VREF_P PIN_A0
#define VREF_N PIN_A1
#define CLK_IN PIN_A2
#define PGED PIN_B0
#define PGEC PIN_B1
#define LED_15 PIN_B2
#define CAN_EN PIN_B3
#define I2C_SCL PIN_B8
#define I2C_SDA PIN_B9
#define SPI_CS1 PIN_B10
#define SPI_CLK PIN_B11
#define SPI_RD PIN_B12
#define SPI_WR PIN_B13
#define CAN_TXD PIN_C0
#define CAN_RXD PIN_C1
#define RS232_RX PIN_C4
#define RS232_TX PIN_C5
#define SPI_CS2 PIN_C6
#define SPARE2 PIN_C7
#define SPARE1 PIN_C8
#define INTX PIN_C9
#define INT_AFE PIN_B7
#use fixed_IO(B_outputs = PIN_B1,PIN_B2,PIN_B3,PIN_B8,PIN_B10,PIN_B11,PIN_B13)
#use fixed_IO(C_outputs = PIN_C5,PIN_C6)
...
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Main:
| Code: | #include <07740.h>
#include <2402.C>
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <can-PIC24.c>
#include <lm76.c>
#FUSES HS,NOWDT,NOOSCIO
#build (stack=256)
...
//CANBUS Clock configuration
#define CAN_BRG_PRESCALAR 4 //Set CAN Baud Rate to 125K
#define CAN_BRG_PHASE_SEGMENT_1 1 //Tq = (2(1+PRESCALAR))/(Fosc/2)
#define CAN_BRG_PHASE_SEGMENT_2 1 //Tq = (2(1+4)/(20000000/2) = 0.000001
#define CAN_BRG_PROPAGATION_TIME 2 //Baud Rate = 1/(((PHASE_SEGMENT_1+1)+(PHASE_SEGMENT_2+1)+(PROPAGATION_TIME+1)+(JUMP_WIDTH+1))*Tq)
#define CAN_BRG_SYNCH_JUMP_WIDTH 0 //Baud Rate = 1/(((1+1)+(1+1)+(2+1)+(0+1))*0.000001) = 125000
//CANBUS pin assignment
// pin_select does not work, pins must be assigned manually!!!!!
// See http://www.ccsinfo.com/forum/viewtopic.php?t=39189
#bit IOLOCK = 0x742.6
#byte OSCCONL = 0x742
#word RPINR26 = 0x06B4 // Location to assign pin to use for CAN RX
#byte RPOR8 = 0x6D0 // Location to assign function to Pin RP16
//CANBUS TX Buffer
unsigned int8 cantxbuffer[8];
...
void main()
{
...
//CANBUS
OSCCONL = 0x46;
OSCCONL = 0x57;
IOLOCK = 0;
RPINR26 = 0x11; // Pin RP17 assigned to CAN 1 RX function
RPOR8 = 0x10; // CAN 1 TX function to Pin RP16
OSCCONL = 0x46;
OSCCONL = 0x57;
IOLOCK = 1;
can_init();
can_set_mode(CAN_OP_CONFIG);
can_enable_b_transfer(TRB0); //make buffer 0 a transmit buffer //
can_enable_b_receiver(RB8);
can_set_mode(CAN_OP_NORMAL);
enable_interrupts(INT_TIMER1);
enable_interrupts(INT_EXT1);
enable_interrupts(INT_EXT2);
...
while(1) // Main loop
{
processHWisrs();
processRxBuff();
//CANBUS
cantxbuffer[0]=0x5a;
can_putd(0x123, &cantxbuffer[0], 1, 1, 1, 0);
...
} |
I thought that I had (manually) unlocked and configured the pins correctly, but am I missing something? Something else? Timing and message are just to see if I can get anything to show up on the TX pin and/or transceiver chip.
I got much of the info here:
http://www.ccsinfo.com/forum/viewtopic.php?t=39189
But that didn't seem to have a full resolution.
Thanks for any help!
Last edited by johns_sd on Tue Jan 20, 2015 6:06 pm; edited 1 time in total |
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dyeatman
Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK
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| Posted: Mon Jan 19, 2015 5:51 pm |
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Just FYI, as a general rule the #Fuses must always be right after your #device line(s) BEFORE the #use delay() line;
| Code: | #include <24HJ64GP504.h>
#device *=16
#device ICD=TRUE
#FUSES HS,NOWDT,NOOSCIO <***************** goes here
#use delay(clock=20000000, osc) // OSC turns on external oscillator input instead of RC
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johns_sd
Joined: 19 Jan 2015
Posts: 3
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| Posted: Mon Jan 19, 2015 5:55 pm |
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Thanks. It didn't make a difference, and the other timing-related stuff was working with it out of place. It used to be there (I deleted some commented-out fuses statements), but I moved it for some reason.
The rest of the code was/is working well before adding the CAN stuff. |
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RF_Developer
Joined: 07 Feb 2011
Posts: 839
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| Posted: Tue Jan 20, 2015 3:13 am |
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| The CAN defines - clock and any other stuff - must be BEFORE the include of can-PIC24.c, otherwise the CAN will use default parameters. |
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johns_sd
Joined: 19 Jan 2015
Posts: 3
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| Posted: Tue Jan 20, 2015 6:09 pm |
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SOLVED: Apparently the CANBUS software was (generally) working, but the program got hung up on another routine due to an apparent switch of the compiler. Has the order in which use statements and other configurations switched from 4.x to 5.x? I had the appropriate I2C code in the body, it just ignored it based on an earlier #include file in 5.x, but worked fine in 4.x.
Thanks all for the suggestions. |
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