1 files changed, 79 insertions, 17 deletions

diff --git a/lib/pbdrv/pb-mod.h b/lib/pbdrv/pb-mod.h
index ae36d22..91e1d1f 100644
--- a/lib/pbdrv/pb-mod.h
+++ b/lib/pbdrv/pb-mod.h
@@ -1,38 +1,100 @@
 #pragma once
 
-/**
- * \file puzzle bus driver implementation
- *
- * Most \c pb_* functions have a weak implementation, which may be
- * overwritten by a custom implementation. This allows you to use the default
- * implementation where possible, and only implement extensions required for
- * your puzzle module. Please see spec.adoc for more information about how to
- * use the puzzle bus driver library.
- */
-
 #include "pb-types.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-//! puzzle module name (optional, default = "???")
+/**
+ * \ingroup pbdrv-mod
+ * \defgroup pb_mod Module
+ * \brief Puzzle module metadata and auxiliary utility functions
+ * \{
+ */
+
+/**
+ * \brief Puzzle module name
+ * \note This constant is optional to define, its default value is "???"
+ */
 extern const char * PB_MOD_NAME;
-//! puzzle module bus address (required)
+/**
+ * \brief Puzzle module bus address
+ * \warning This variable **must** be defined by the user
+ */
 extern const i2c_addr_t PB_MOD_ADDR;
 
+/// \}
+
+/**
+ * \ingroup pbdrv-mod
+ * \defgroup pb_i2c I2C
+ * \brief I2C send/receive handlers
+ *
+ * \{
+ */
+
+/**
+ * \brief Handle a received message from the I2C bus (puzzle bus)
+ *
+ * This function attempts to parse an I2C message as a puzzle bus message, and
+ * calls the appropriate handler for the message if it is considered valid.
+ * Invalid messages are silently ignored.
+ *
+ * \param buf pointer to message content
+ * \param sz size of \p buf
+ *
+ * \note This function should not be directly called from an ISR. Please use
+ * FreeRTOS's \c xTimerPendFunctionCallFromISR() or a similar scheduler-based
+ * deferred function call mechanism instead.
+ */
 void pb_i2c_recv(const uint8_t * buf, size_t sz);
+/**
+ * \brief Send a message in master-mode on the I2C bus (puzzle bus)
+ *
+ * This function sends an I2C message to the address specified by \p i2c_addr.
+ *
+ * \param i2c_addr address of slave controller
+ * \param buf pointer to message content
+ * \param sz size of \p buf
+ */
 void pb_i2c_send(i2c_addr_t i2c_addr, const uint8_t * buf, size_t sz);
 
-pb_global_state_t pb_hook_mod_state_read();
-void pb_hook_mod_state_write(pb_global_state_t state);
+/// \}
+
+/// \ingroup pb_hook
+/// \{
 
 /**
- * \brief platform-specific blocking delay function
+ * \defgroup pb_hook_mod_state State
+ * \brief Provide your own global state variable
  *
- * FIXME: this should be removed (see handover: RP2040 I2C limitations)
+ * If your puzzle module defines its own global \c pb_global_state_t, you can
+ * tell the driver to use it by implementing these functions. These functions
+ * are also used internally by the driver.
+ *
+ * \{
  */
-void pb_mod_blocking_delay_ms(unsigned long ms);
+
+/**
+ * \brief global state read hook
+ * \return current value of global state enum
+ *
+ * The default implementation of this function uses an internal global state
+ * variable in \ref pbdrv.
+ */
+pb_global_state_t pb_hook_mod_state_read();
+/**
+ * \brief global state write hook
+ * \param state new value of global state enum
+ *
+ * The default implementation of this function uses an internal global state
+ * variable in \ref pbdrv.
+ */
+void pb_hook_mod_state_write(pb_global_state_t state);
+
+/// \}
+/// \}
 
 #ifdef __cplusplus
 }