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labviewman
Joined: 05 Dec 2011
Posts: 11
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| dsPIC33 only sends ID of 0x00 on CAN2 when using ext frame |
 Posted: Tue Aug 05, 2014 8:00 am |
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Is there an issue with the CCS compiler being able to correctly compile code to send CAN messages on CAN2 ? I have code that is pretty simple and uses both CAN ports and has identical function calls except CAN2 uses functions for CAN2, but I only get arbID 0x00 on CAN 2 for extended frames....seems to work OK with standard ID (at least with compiler version 4.125).
I just upgraded to the latest compiler version (5.026) yesterday (8/4/2014) in the hopes it would work, but it didn't.
Here is the CAN related code (uC is a 33FJ64GP706A):
| Code: |
// high-speed CAN, 125 Kbit/sec
//use 1/2 of the clock frequency on MBTime with a dsPIC33
#define CAN_BRG_PRESCALAR 0
#define CAN_BRG_SYNCH_JUMP_WIDTH 0
#define CAN_BRG_PROPAGATION_TIME 2
#define CAN_BRG_PHASE_SEGMENT_1 7
#define CAN_BRG_SAM 0
#define CAN_BRG_SEG_2_PHASE_TS 1
#define CAN_BRG_PHASE_SEGMENT_2 7
#define CAN_BRG_WAKE_FILTER 0
//cluster CAN bus, single wire, 33.333 Kbps
//use 1/2 of the clock frequency on MBTime with a dsPIC33
#define CAN2_BRG_PRESCALAR 2
#define CAN2_BRG_SYNCH_JUMP_WIDTH 0
#define CAN2_BRG_PROPAGATION_TIME 7
#define CAN2_BRG_PHASE_SEGMENT_1 7
#define CAN2_BRG_SAM 0
#define CAN2_BRG_SEG_2_PHASE_TS 1
#define CAN2_BRG_PHASE_SEGMENT_2 7
#define CAN2_BRG_WAKE_FILTER 0
#define CAN_USE_EXTENDED_ID TRUE
//////////
can_init();
can2_init();
can_set_mode(CAN_OP_CONFIG); //must be in config mode before params can be set
can_enable_b_transfer(0); //buffers used for tx
can_enable_b_transfer(1);
can_enable_b_transfer(2);
can_enable_b_transfer(3);
can_enable_b_transfer(4);
can_enable_b_transfer(5);
can_enable_b_transfer(6);
can_enable_b_transfer(7);
can_set_mode(CAN_OP_NORMAL);
can2_set_mode(CAN_OP_CONFIG); //must be in config mode before params can be set
can2_enable_b_transfer(0); //buffers used for tx
can2_enable_b_transfer(1);
can2_enable_b_transfer(2);
can2_set_mode(CAN_OP_NORMAL);
while(true)
{
can2_putd(0x24c, &data, 8, 3, TRUE, FALSE);
can_putd(0x24c, &data, 8, 3, TRUE, FALSE);
can2_putd(0x24c, &data2, 8, 3, TRUE, FALSE);
can_putd(0x24c, &data2, 8, 3, TRUE, FALSE);
delay_ms(1000);
}
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What gives? Why do I only get ArbID on CAN2 ???? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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labviewman
Joined: 05 Dec 2011
Posts: 11
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| Posted: Tue Aug 05, 2014 6:06 pm |
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Interesting posts...pretty frustrating MicroChip has so many issues, but I read the errata for this micro (33FJ64GP706A) but didn't see anything on ECAN that applied to my observation.
CCS tried the code on a PIC24HJ256GP610 which worked perfectly, so I suspect it's a feature of my micro...strange it's not in the errata. I guess I will end up cutting traces and wire the bus to CAN1 which works fine  |
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labviewman
Joined: 05 Dec 2011
Posts: 11
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| Posted: Tue Aug 12, 2014 9:39 am |
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| Must have been a problem with the CANoe configuration I was using....tested again with CANalyzer and it worked perfectly....weird |
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