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291 lines
7.2 KiB
291 lines
7.2 KiB
#ifndef TinyFrameH
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#define TinyFrameH
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/**
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* TinyFrame protocol library
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*
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* (c) Ondřej Hruška 2017, MIT License
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* no liability/warranty, free for any use, must retain this notice & license
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*
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* Upstream URL: https://github.com/MightyPork/TinyFrame
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*/
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#define TF_VERSION "1.2.0"
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//---------------------------------------------------------------------------
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#include <stdint.h> // for uint8_t etc
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#include <stdbool.h> // for bool
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#include <stdlib.h> // for NULL
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//---------------------------------------------------------------------------
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// Select checksum type (0 = none, 8 = ~XOR, 16 = CRC16 0x8005, 32 = CRC32)
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#define TF_CKSUM_NONE 0
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#define TF_CKSUM_XOR 8
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#define TF_CKSUM_CRC16 16
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#define TF_CKSUM_CRC32 32
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#include <TF_Config.h>
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//region Resolve data types
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#if TF_LEN_BYTES == 1
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typedef uint8_t TF_LEN;
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#elif TF_LEN_BYTES == 2
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typedef uint16_t TF_LEN;
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#elif TF_LEN_BYTES == 4
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typedef uint32_t TF_LEN;
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#else
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#error Bad value of TF_LEN_BYTES, must be 1, 2 or 4
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#endif
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#if TF_TYPE_BYTES == 1
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typedef uint8_t TF_TYPE;
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#elif TF_TYPE_BYTES == 2
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typedef uint16_t TF_TYPE;
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#elif TF_TYPE_BYTES == 4
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typedef uint32_t TF_TYPE;
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#else
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#error Bad value of TF_TYPE_BYTES, must be 1, 2 or 4
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#endif
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#if TF_ID_BYTES == 1
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typedef uint8_t TF_ID;
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#elif TF_ID_BYTES == 2
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typedef uint16_t TF_ID;
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#elif TF_ID_BYTES == 4
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typedef uint32_t TF_ID;
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#else
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#error Bad value of TF_ID_BYTES, must be 1, 2 or 4
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#endif
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#if TF_CKSUM_TYPE == TF_CKSUM_XOR || TF_CKSUM_TYPE == TF_CKSUM_NONE
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// ~XOR (if 0, still use 1 byte - it won't be used)
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typedef uint8_t TF_CKSUM;
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#elif TF_CKSUM_TYPE == TF_CKSUM_CRC16
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// CRC16
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typedef uint16_t TF_CKSUM;
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#elif TF_CKSUM_TYPE == TF_CKSUM_CRC32
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// CRC32
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typedef uint32_t TF_CKSUM;
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#else
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#error Bad value for TF_CKSUM_TYPE, must be 8, 16 or 32
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#endif
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// Bytes added to TF_MAX_PAYLOAD for the send buffer size.
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#define TF_OVERHEAD_BYTES \
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(1*TF_USE_SOF_BYTE + \
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sizeof(TF_ID) + \
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sizeof(TF_LEN) + \
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sizeof(TF_CKSUM) + \
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sizeof(TF_TYPE) + \
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sizeof(TF_CKSUM) \
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)
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//endregion
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//---------------------------------------------------------------------------
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// Type-dependent masks for bit manipulation in the ID field
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#define TF_ID_MASK (TF_ID)(((TF_ID)1 << (sizeof(TF_ID)*8 - 1)) - 1)
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#define TF_ID_PEERBIT (TF_ID)((TF_ID)1 << ((sizeof(TF_ID)*8) - 1))
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//---------------------------------------------------------------------------
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/** Peer bit enum (used for init) */
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typedef enum {
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TF_SLAVE = 0,
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TF_MASTER,
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} TF_Peer;
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typedef enum {
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TF_NEXT = 0, //!< Not handled, let other listeners handle it
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TF_STAY = 1, //!< Handled, stay
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TF_RENEW = 2, //!< Handled, stay, renew - useful only with listener timeout
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TF_CLOSE = 3, //!< Handled, remove self
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} TF_Result;
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/** Data structure for sending / receiving messages */
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typedef struct _TF_MSG_STRUCT_ {
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TF_ID frame_id; //!< message ID
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bool is_response; //!< internal flag, set when using the Respond function. frame_id is then kept unchanged.
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TF_TYPE type; //!< received or sent message type
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const uint8_t *data; //!< buffer of received data or data to send. NULL = listener timed out, free userdata!
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TF_LEN len; //!< length of the buffer
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void *userdata; //!< here's a place for custom data; this data will be stored with the listener
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void *userdata2;
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} TF_Msg;
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/**
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* Clear message struct
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*/
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static inline void TF_ClearMsg(TF_Msg *msg)
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{
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msg->frame_id = 0;
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msg->is_response = false;
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msg->type = 0;
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msg->data = NULL;
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msg->len = 0;
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msg->userdata = NULL;
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msg->userdata2 = NULL;
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}
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/**
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* TinyFrame Type Listener callback
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*
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* @param frame_id - ID of the received frame
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* @param type - type field from the message
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* @param data - byte buffer with the application data
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* @param len - number of bytes in the buffer
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* @return listener result
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*/
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typedef TF_Result (*TF_Listener)(TF_Msg *msg);
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/**
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* Initialize the TinyFrame engine.
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* This can also be used to completely reset it (removing all listeners etc)
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*
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* @param peer_bit - peer bit to use for self
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*/
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void TF_Init(TF_Peer peer_bit);
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/**
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* Reset the frame parser state machine.
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* This does not affect registered listeners.
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*/
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void TF_ResetParser(void);
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/**
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* Register a frame type listener.
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*
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* @param msg - message (contains frame_id and userdata)
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* @param cb - callback
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* @param timeout - timeout in ticks to auto-remove the listener (0 = keep forever)
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* @return slot index (for removing), or TF_ERROR (-1)
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*/
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bool TF_AddIdListener(TF_Msg *msg, TF_Listener cb, TF_TICKS timeout);
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/**
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* Remove a listener by the message ID it's registered for
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*
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* @param frame_id - the frame we're listening for
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*/
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bool TF_RemoveIdListener(TF_ID frame_id);
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/**
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* Register a frame type listener.
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*
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* @param frame_type - frame type to listen for
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* @param cb - callback
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* @return slot index (for removing), or TF_ERROR (-1)
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*/
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bool TF_AddTypeListener(TF_TYPE frame_type, TF_Listener cb);
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/**
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* Remove a listener by type.
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*
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* @param type - the type it's registered for
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*/
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bool TF_RemoveTypeListener(TF_TYPE type);
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/**
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* Register a generic listener.
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*
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* @param cb - callback
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* @return slot index (for removing), or TF_ERROR (-1)
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*/
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bool TF_AddGenericListener(TF_Listener cb);
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/**
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* Remove a generic listener by function pointer
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*
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* @param cb - callback function to remove
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*/
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bool TF_RemoveGenericListener(TF_Listener cb);
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/**
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* Send a frame, no listener
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*
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* @param msg - message struct. ID is stored in the frame_id field
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* @return success
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*/
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bool TF_Send(TF_Msg *msg);
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/**
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* Like TF_Send, but without the struct
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*/
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bool TF_SendSimple(TF_TYPE type, const uint8_t *data, TF_LEN len);
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/**
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* Like TF_Query, but without the struct
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*/
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bool TF_QuerySimple(TF_TYPE type, const uint8_t *data, TF_LEN len, TF_Listener listener, TF_TICKS timeout, void *userdata);
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/**
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* Send a frame, and optionally attach an ID listener.
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*
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* @param msg - message struct. ID is stored in the frame_id field
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* @param listener - listener waiting for the response (can be NULL)
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* @param timeout - listener expiry time in ticks
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* @return success
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*/
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bool TF_Query(TF_Msg *msg, TF_Listener listener, TF_TICKS timeout);
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/**
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* Send a response to a received message.
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*
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* @param msg - message struct. ID is read from frame_id. set ->renew to reset listener timeout
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* @return success
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*/
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bool TF_Respond(TF_Msg *msg);
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/**
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* Renew ID listener timeout
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*
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* @param id - listener ID to renew
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* @return true if listener was found and renewed
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*/
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bool TF_RenewIdListener(TF_ID id);
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/**
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* Accept incoming bytes & parse frames
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*
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* @param buffer - byte buffer to process
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* @param count - nr of bytes in the buffer
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*/
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void TF_Accept(const uint8_t *buffer, size_t count);
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/**
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* Accept a single incoming byte
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*
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* @param c - a received char
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*/
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void TF_AcceptChar(uint8_t c);
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/**
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* 'Write bytes' function that sends data to UART
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*
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* ! Implement this in your application code !
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*/
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extern void TF_WriteImpl(const uint8_t *buff, size_t len);
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/**
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* This function should be called periodically.
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*
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* The time base is used to time-out partial frames in the parser and
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* automatically reset it.
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*
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* (suggestion - call this in a SysTick handler)
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*/
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void TF_Tick(void);
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/** Claim the TX interface before composing and sending a frame */
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extern void TF_ClaimTx(void);
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/** Free the TX interface after composing and sending a frame */
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extern void TF_ReleaseTx(void);
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#endif
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