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pet007
Joined: 25 Jan 2023
Posts: 19
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| 18F47Q84 - CAN FD issue -can_putd() -> CAN_EC_OBJ_TX_FULL |
 Posted: Wed Apr 10, 2024 9:40 am |
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Hi, pls I have problem with can_put() function, when I'm debuging it, it returns this error value:
| Code: |
..
//Check TFNRFNIF bit in C1FIFOSTAm register to determine if FIFO is full
if(pFIFOSta->TFNRFNIF == 0)
{
return(CAN_EC_OBJ_TX_FULL);
}
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If I turn CAN_OPERATION_MODE to 1 (CAN 2.0B), everything is working fine, as well as Rx filters are working well on CAN FD. My config in main.h:
| Code: |
#include <18F47Q84.h>
#device ADC=12
#device ICD=TRUE
#use delay(internal=64MHz)
// -------------------------------------------------
// === CANBUS config === Start
// -------------------------------------------------
#define CAN_SPEED 1000 // kBit
#define CAN_TX_PIN PIN_B2
#define CAN_RX_PIN PIN_B3 // DEFAULT
#define CAN_OPERATION_MODE 0 // 1 - CAN 2.0B , 0 - CANFD -> nefunguje, jen s CAN 2.0B
#define CAN_NOMINAL_BAUD_RATE CAN_SPEED*1000 // v b/s
#define CAN_DATA_BAUD_RATE 0
#define CAN_TIME_BASE_COUNTER_PRESCALAR 64
//#define CAN_TX_BUFFERS 8 // 1-32
#define CAN_TX_MAX_PAYLOAD_SIZE PAYLOAD_SIZE_64_BYTES
//#define CAN_CLOCK_SPEED 64*1000000 // 64Mhz - kdyz nic, sam vezme akt. CLOCK
// CAN RX - Filter 1 - ID=0x20-0x27
#define CAN_USE_FILTERS TRUE
#define CAN_USER_FILT_0 0x20
#define CAN_USER_MASK_0 0x1FFFFFF8 0x20-0x27 -bity [0:3]
#define CAN_USER_FILT_0_TYPE CAN_FILTER_TYPE_SID_ONLY //
#define CAN_USER_FILT_0_OBJECT CAN_OBJECT_FIFO_1
// CAN RX - Filter 2 - ID=0x120-0x127
#define CAN_USER_FILT_1 0x120
#define CAN_USER_MASK_1 0x1FFFFFF8 // 0x120-0x127 maskujeme bity [0:3]
#define CAN_USER_FILT_1_TYPE CAN_FILTER_TYPE_SID_ONLY
#define CAN_USER_FILT_1_OBJECT CAN_OBJECT_FIFO_2
#include <can-pic18_fd.c> // must be here afters define
// -------------------------------------------------
// === CANBUS config === End
// -------------------------------------------------
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and then in main.c (working well in CAN 2.0 B mode and max. 8 bytes payload of course)
...
| Code: |
void CAN_Send_ADC_mV(u32 ID) //, tADC ADC) // posle 3x pakety s ID, ID+1, ID+2 , kazdy posila 4xU16 ADC resulty v mV, celkem tedy 3x4 = 12x ADC U16 v mV
{
#define LEN 8
CAN_TX_HEADER CanTx;
u8 bufTx[LEN],i=0;
CanTx.Length = LEN; CanTx.ext = 1; CanTx.Format = CAN_MESSAGE_FORMAT_CAN_FD;
CanTx.Id = ID;
for (i=0; i<LEN; i++)
{
bufTx[i] = i;
}
can_putd(&CanTx, bufTx);
}
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I have some wrong settings for CAN_OBJECT_TXQ FIFO buffer probably, but I'm a bit confused, where/what FIFO to set it up correctly.
Thanks for any help. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19238
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| Posted: Wed Apr 10, 2024 11:25 am |
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| CAN FD _requires_ the longer CAN 2.0B address field. So needs 1 selected.... |
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pet007
Joined: 25 Jan 2023
Posts: 19
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| Posted: Wed Apr 10, 2024 11:59 am |
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Hmm, not understand yet......
The longer ID isn't a problem - I'd like to use CAN FD due bigger payload (up to 64 bytes instead of 8 for Can 2.0 B).... |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19238
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| Posted: Wed Apr 10, 2024 1:14 pm |
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Does the chip you are using have a peripheral that supports FD???
The standard CCS software does not support FD. You have to be using
the FD drivers can-dspic33_fd.c, for the PIC24/33 with an FD peripheral,
or can-mcp2517.c for the external FD peripheral. Using the MCP2517FD.
The normal PIC CAN hardware does not support this. |
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pet007
Joined: 25 Jan 2023
Posts: 19
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| Posted: Wed Apr 10, 2024 10:46 pm |
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Of course the PIC18F47Q84 is capable to handle CAN Flexible Data. (My transceiver AT6560 is CAN FD ready too). HW isn't an issue IMHO..
When I call getenv("CAN"), it returns 3 -> CANFD peripheral is present.
I'm using can-pic18_fd.c driver... |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19238
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| Posted: Thu Apr 11, 2024 1:25 am |
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| So you are using the can-dspic33_fd.c driver?. |
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pet007
Joined: 25 Jan 2023
Posts: 19
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| Posted: Thu Apr 11, 2024 2:01 am |
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| Ttelmah wrote: | | So you are using the can-dspic33_fd.c driver?. |
 No, it's already noted in previous post -
| Quote: | | I'm using can-pic18_fd.c driver... |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19238
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| Posted: Thu Apr 11, 2024 7:30 am |
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OK. Great. However it still goes back to the fact you cannot use CAN FD,
and set CAN_OPERATION_MODE to 0.. Using FD requires the operating
mode to be 2.0b. The FD driver supports programming the FD peripheral to
non FD modes. This is what you are doing. |
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pet007
Joined: 25 Jan 2023
Posts: 19
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| Posted: Thu Apr 11, 2024 7:39 am |
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| Hmm I'm still confused. But in 2.0b mode I can't use more than 8bytes as payload, can I ? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19238
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| Posted: Thu Apr 11, 2024 11:19 am |
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The point is you don't want to switch the device down to 2.0a mode,
you need to leave it in FD mode, and then the format of the packet
determines how the system behaves. 64byyte data is only supported
when FD mode is selected. |
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pet007
Joined: 25 Jan 2023
Posts: 19
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| Posted: Thu Apr 11, 2024 1:55 pm |
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In file can-pic18_fd.h is written:
| Code: |
PREPROCESSORS:
----------------------------------------------------------------------------
CAN_OPERATION_MODE
The CAN operational mode of peripheral after can_init() is called,
0 - CAN FD mode or 1 - CAN 2.0 mode. Defaults to CAN FD mode.
...
...
...
#ifndef __CAN_PIC18_FD_H__
#define __CAN_PIC18_FD_H__
#define CAN_DEVICE_HAS_FD
#include <stdint.h>
#ifndef CAN_OPERATION_MODE
#define CAN_OPERATION_MODE 0 //0-CAN FD, 1-CAN 2.0
#endif
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- it means, if there is this definition in my main.h :
#define CAN_OPERATION_MODE 0 = > CAN FD mode
then MCU is operating in CAN FD mode (or it should).
Note: CAN 2.0A or CAN 2.0B are the same in payload question - both are able to transfer only 8 bytes, only difference is that CAN 2.0B is able to use 29bit extended ID (instead of only 11bit for CAN 2.0A).
So the question is still the same - if is it possible with this driver (can-pic18_fd.c) to switch this MCU into working CAN FD mode... |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19238
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| Posted: Thu Apr 11, 2024 2:29 pm |
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So what does the bus support?
You do understand that if you are talking to a CAN2 peripheral, you can
select FD, but the bus will switch down to CAN2 mode, and only support
a CAN2 packet?. So no 64byte data. A CAN FD master can normally only
use CAN FD packets on a bus that is only using CAN FD.
A CAN FD bus cannot support simultaneous CAN2 and CAN FD messages. |
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