void mcp2515_write(uint8_t reg, uint8_t data) { // ... (code to write to MCP2515) }

void mcp2515_init() { // Initialize SPI // ... (code to initialize SPI)

uint8_t mcp2515_receive(uint8_t* data) { can_state_t state; uint8_t length;

// Check if CAN bus has received a message state = (mcp2515_read(MCP2515_CANSTAT) >> 5) & 0x03; if (state != CAN_STATE_RECEIVE) { // Handle error } mcp2515 proteus library best