S12ZVC Busoff

[xiaohui200808]

Hi

    I am using S12ZVC64,  The trouble is I cannot  set bus-off selfrecovery. Because the involved Register cannot found in MC9S12ZVC64.H  when Iadd the involved Register（CAN0CTL1_BORM   and   CAN0MISC ），it could  recovery when BUS-off appeared.

    Could you tellme how to do about it or could you give me a DEMO about S12ZVC CAN Bus-off.   Thankyou

[lama]

Hi,

I use CodeWarrior v10.6 and in the file mc9s12zvc64.h you can find both:

/*** CAN0CTL1 - MSCAN0 Control 1 Register; 0x00000801 ***/
typedef union {
  byte Byte;
  struct {
    byte INITAK      :1;                                       /* Initialization Mode Acknowledge */
    byte SLPAK       :1;                                       /* Sleep Mode Acknowledge */
    byte WUPM        :1;                                       /* Wake-Up Mode */
    byte BORM        :1;                                       /* Bus-Off Recovery Mode */
    byte LISTEN      :1;                                       /* Listen Only Mode */
    byte LOOPB       :1;                                       /* Loop Back Self Test Mode */
    byte CLKSRC      :1;                                       /* MSCAN Clock Source */
    byte CANE        :1;                                       /* MSCAN Enable */
  } Bits;
} CAN0CTL1STR;
extern volatile CAN0CTL1STR _CAN0CTL1 @0x00000801;
#define CAN0CTL1                        _CAN0CTL1.Byte
#define CAN0CTL1_INITAK                 _CAN0CTL1.Bits.INITAK
#define CAN0CTL1_SLPAK                  _CAN0CTL1.Bits.SLPAK
#define CAN0CTL1_WUPM                   _CAN0CTL1.Bits.WUPM
#define CAN0CTL1_BORM                   _CAN0CTL1.Bits.BORM
#define CAN0CTL1_LISTEN                 _CAN0CTL1.Bits.LISTEN
#define CAN0CTL1_LOOPB                  _CAN0CTL1.Bits.LOOPB
#define CAN0CTL1_CLKSRC                 _CAN0CTL1.Bits.CLKSRC
#define CAN0CTL1_CANE                   _CAN0CTL1.Bits.CANE

#define CAN0CTL1_INITAK_MASK            1U
#define CAN0CTL1_SLPAK_MASK             2U
#define CAN0CTL1_WUPM_MASK              4U
#define CAN0CTL1_BORM_MASK              8U
#define CAN0CTL1_LISTEN_MASK            16U
#define CAN0CTL1_LOOPB_MASK             32U
#define CAN0CTL1_CLKSRC_MASK            64U
#define CAN0CTL1_CANE_MASK              128U

/*** CAN0MISC - MSCAN0 Miscellaneous Register; 0x0000080D ***/
typedef union {
  byte Byte;
  struct {
    byte BOHOLD      :1;                                       /* Bus-off State Hold Until User Request */
    byte             :1;
    byte             :1;
    byte             :1;
    byte             :1;
    byte             :1;
    byte             :1;
    byte             :1;
  } Bits;
} CAN0MISCSTR;
extern volatile CAN0MISCSTR _CAN0MISC @0x0000080D;
#define CAN0MISC                        _CAN0MISC.Byte
#define CAN0MISC_BOHOLD                 _CAN0MISC.Bits.BOHOLD

#define CAN0MISC_BOHOLD_MASK            1U

I am not able to provide you example for S12Z, however you can use easy portable example for S12G presented in attachment. (Note, it uses standard IDE of the CW but source file are readable)

best regards,

Ladislav