Start controller code

src/controller/controller.ino

@@ -0,0 +1,68 @@
+#include <mcp2515.h>
+
+#define STATE_INACTIVE 0
+#define STATE_HELLO    1
+#define STATE_GAME     2
+
+#define OBUS_CONTROLLER_ID 0x000
+
+#define OBUS_TYPE_CONTROLLER 0
+#define OBUS_TYPE_PUZZLE     1
+#define OBUS_TYPE_NEEDY      2
+
+#define OBUS_MSG_LENGTH 8  // Max 8 to fit in a CAN message
+
+#define OBUS_MSGTYPE_C_ACK       0
+#define OBUS_MSGTYPE_C_HELLO     1
+#define OBUS_MSGTYPE_C_GAMESTART 2
+#define OBUS_MSGTYPE_C_STATE     3
+#define OBUS_MSGTYPE_C_SOLVED    4
+#define OBUS_MSGTYPE_C_TIMEOUT   5
+#define OBUS_MSGTYPE_C_STRIKEOUT 6
+
+#define OBUS_MSGTYPE_M_HELLO  0
+#define OBUS_MSGTYPE_M_STRIKE 1
+#define OBUS_MSGTYPE_M_SOLVED 2
+
+#define CAN_DOMINANT  0
+#define CAN_RECESSIVE 1
+
+MCP2515 mcp2515(10);
+
+uint8_t state = STATE_INACTIVE;
+
+
+void setup() {
+	Serial.begin(9600);
+	mcp2515.reset();
+	mcp2515.setBitrate(CAN_50KBPS);
+	mcp2515.setNormalMode();
+	Serial.println("begin");
+}
+
+uint16_t make_id(uint8_t id, bool priority, uint8_t type) {
+	assert(type <= 0x11);
+
+	/* b bb bbbbbbbb
+	 * ↓ type  module ID
+	 * priority bit
+	 */
+	return \
+		((uint16_t) (priority ? CAN_DOMINANT : CAN_RECESSIVE) << 10) | \
+		((uint16_t) type << 8) | \
+		(uint16_t) id;
+}
+
+void start_hello() {
+	state = STATE_HELLO;
+
+	char message[OBUS_MSG_LENGTH + 1];
+	message[OBUS_MSG_LENGTH] = '\0';
+	send_frame.can_id = make_id(OBUS_CONTROLLER_ID, false, OBUS_TYPE_CONTROLLER);
+	send_frame.can_dlc = OBUS_MSG_LENGTH;
+	mcp2515.sendMessage(&send_frame);
+	Serial.println("sent");
+}
+
+void loop() {
+}