// CAN status register bits #define CANSTAT_RX0IF 0x04 #define CANSTAT_TX0IF 0x08

// CAN control register bits #define CANCTRL_REQTX 0x08 #define CANCTRL_RREQ 0x20

void mcp2515_transmit(uint8_t* data, uint8_t length) { can_state_t state;

// Enable interrupts // ... (code to enable interrupts) }