3 files changed, 12 insertions, 6 deletions
diff --git a/shared/pb/driver.c b/shared/pb/driver.c
index 2552b61..6b675ca 100644
--- a/shared/pb/driver.c
+++ b/shared/pb/driver.c
@@ -7,7 +7,7 @@ __weak bool pbdrv_hook_cmd() {
 
 __weak void pbdrv_i2c_recv(uint16_t addr, const char * buf, size_t sz) {
 	if (sz == 0) return;
-	enum pb_cmd cmd = (enum pb_cmd) buf[0];
+	pb_cmd_t cmd = (enum pb_cmd) buf[0];
 
 	// shift buffer pointer to only contain the puzzle bus message buf
 	buf++;
diff --git a/shared/pb/driver.h b/shared/pb/driver.h
index 1c9c3a3..b5b2784 100644
--- a/shared/pb/driver.h
+++ b/shared/pb/driver.h
@@ -13,8 +13,8 @@ extern "C" {
 void pbdrv_i2c_recv(uint16_t addr, const char * buf, size_t sz);
 void pbdrv_i2c_send(uint16_t addr, const char * buf, size_t sz);
 
-void pbdrv_hook_state(enum pb_global_state * state, bool rw);
-bool pbdrv_hook_cmd(enum pb_cmd cmd, const char * buf, size_t sz);
+void pbdrv_hook_state(pb_state_t * state, bool rw);
+bool pbdrv_hook_cmd(pb_cmd_t cmd, const char * buf, size_t sz);
 
 void pbdrv_handle_read(const char * buf, size_t sz);
 
diff --git a/shared/pb/types.h b/shared/pb/types.h
index 8150194..93e2f0c 100644
--- a/shared/pb/types.h
+++ b/shared/pb/types.h
@@ -24,18 +24,24 @@ extern "C" {
  * The first byte of a puzzle bus message's data indicates the command type.
  */
 enum __packed pb_cmd {
-	PB_CMD_READ,   //!< read a puzzle module property
-	PB_CMD_WRITE,  //!< write to a puzzle module property
+	PB_CMD_READ, //!< read a puzzle module property
+	PB_CMD_WRITE, //!< write to a puzzle module property
 	// PB_CMD_UPDATE, //!< request an update
+	PB_CMD_MAGIC = 0x69, //!< magic message
 };
+typedef enum pb_cmd pb_cmd_t;
+
+static const char pb_magic_msg[] = { 0x70, 0x75, 0x7a, 0x62, 0x75, 0x73 };
+static const char pb_magic_res[] = { 0x67, 0x61, 0x6d, 0x69, 0x6e, 0x67 };
 
 /** \brief Puzzle bus global states */
-enum __packed pb_global_state {
+enum __packed pb_state {
 	PB_GS_NOINIT,  //!< uninitialized (only used by puzzle modules)
 	PB_GS_IDLE,    //!< puzzle not started yet
 	PB_GS_PLAYING, //!< puzzle actively being solved
 	PB_GS_SOLVED,  //!< puzzle completed
 };
+typedef enum pb_state pb_state_t;
 
 typedef struct __packed {
 	uint8_t address;