Stuff

typedef struct canregs {
    union
    {
        struct
        {
            canmessage_t messageReg;
            uint8_t someOtherReg; // padding
        } msgArr[16];
        struct {
            uint8_t      controlReg;               // Control Register
            uint8_t      statusReg;                // Status Register
            uint8_t      cpuInterfaceReg;          // CPU Interface Register
            uint8_t      reserved1Reg;
            uint8_t      highSpeedReadReg[2];      // High Speed Read
            uint8_t      globalMaskStandardReg[2]; // Standard Global Mask byte 0
            uint8_t      globalMaskExtendedReg[4]; // Extended Global Mask bytes
            uint8_t      message15MaskReg[4];      // Message 15 Mask bytes
            canmessage_t message1Reg;
            uint8_t      clkOutReg;                // Clock Out Register
            canmessage_t message2Reg;
            uint8_t      busConfigReg;             // Bus Configuration Register
            canmessage_t message3Reg;
            uint8_t      bitTiming0Reg;            // Bit Timing Register byte 0
            canmessage_t message4Reg;
            uint8_t      bitTiming1Reg;            // Bit Timing Register byte 1
            canmessage_t message5Reg;
            uint8_t      interruptReg;             // Interrupt Register
            canmessage_t message6Reg;
            uint8_t      reserved2Reg;
            canmessage_t message7Reg;
            uint8_t      reserved3Reg;
            canmessage_t message8Reg;
            uint8_t      reserved4Reg;
            canmessage_t message9Reg;
            uint8_t      p1ConfReg;
            canmessage_t message10Reg;
            uint8_t      p2ConfReg;
            canmessage_t message11Reg;
            uint8_t      p1InReg;
            canmessage_t message12Reg;
            uint8_t      p2InReg;
            canmessage_t message13Reg;
            uint8_t      p1OutReg;
            canmessage_t message14Reg;
            uint8_t      p2OutReg;
            canmessage_t message15Reg;
            uint8_t      serialResetAddressReg;
        };
    };
} canregs_t __attribute__ ((packed));