CAN communications with PICS

[earltyso]

BIG WUMPUS,
Thanks for the success story.

I am doing the same basic thing, just need to be able to read a single can bus and decode data from it, then outputting data to LCD, leds, etc.
Later this year I will be moving back into C programming with dsPIC's to talk to multiple CAN modules. This will take time of coarse, but for now I would really like to see If I can use PBP to just decode the data from the can.

Can you provide any other places to begin researching, datasheets etc?
thanks,

[BigWumpus]

I have written this code:

Get it, look inside the datasheet of the CAN-Module and try to understand it.
There is some trouble about timing, then I configure the filters and registers.
In the main-program I poll the flags in order to see new data.


---

;==========================================================================
;CAN-Interface steuern
;==========================================================================
CAN_Init:
    CANCON=%10010000:Repeat:Until (CANSTAT & %11100000)=%10000000;Configuration Mode einschalten
    ECANCON=%01000000                               ;Mode 1
    RXFCON0=%00000000:RXFCON1=%00000000             ;alle 16 Filter:deaktiviert
    MSEL0=%11111111:MSEL1=%11111111:MSEL2=%11111111:MSEL3=%11111111;alle 16 Filter:no mask
    RXFBCON0=%00110010:RXFBCON1=%01010100:RXFBCON2=%01110110;Filter 0-5 -> B0-B5
    CIOCON=%00100000
    select case CAN_Mode
        case wMode_EuroTiger:                       ;Euro-Tiger
            BRGCON1=%01000001:BRGCON2=%10110001:BRGCON3=%00000101;BRP=0TQ,Sync=1TQ,Prop=2TQ,Phase1=7TQ,Phase2=6TQ,SJW=2TQ
            ;B0: EEC1 $0CF00400 Motordrehzahl
            RXF0SIDH=%01100111:RXF0SIDL=%10001000:RXF0EIDH=%00000100:RXF0EIDL=%00000000
            ;B1: EEC2 $0CF00300 Lastquotient
            RXF1SIDH=%01100111:RXF1SIDL=%10001000:RXF1EIDH=%00000011:RXF1EIDL=%00000000
            ;B2: Eng_Temp $18FEEE00 Temperaturen
            RXF2SIDH=%11000111:RXF2SIDL=%11101010:RXF2EIDH=%11101110:RXF2EIDL=%00000000
            ;B3: Inlet Conditions $18FEF600 Ladeduck
            RXF3SIDH=%11000111:RXF3SIDL=%11101010:RXF3EIDH=%11110110:RXF3EIDL=%00000000
            RXFCON0=%00001111                       ;Filter 0-3 aktiviert
    End select

CAN_ON:
    tCAN_Sleep=wInput                               ;CAN-Transmitter einschalten
    CANCON=%01110000:Repeat:Until (CANSTAT & %11100000)=%01100000;Listen Mode einschalten
    CAN_Clear=%00111111:CAN_Restart=%00111111       ;alle Buffer leeren und alle Timer neu starten
    Return

CAN_OFF:
    CANCON=%00110000:Repeat:Until (CANSTAT & %11100000)=%00100000;Disable Mode einschalten
    CAN_Sleep=true:tCAN_Sleep=wOutput:Return        ;CAN-Transmitter ausschalten

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