A simple library for building and parsing data frames for serial interfaces (like UART / RS232)
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
TinyFrame/TinyFrame.h

272 lines
7.5 KiB

#ifndef TinyFrameH
#define TinyFrameH
//---------------------------------------------------------------------------
#include <stdint.h> // for uint8_t etc
#include <stdbool.h> // for bool
#include <stdlib.h> // for NULL
//#include "messages.h" // for your message IDs (enum or defines)
//#include <esp8266.h> // when using with esphttpd
//---------------------------------------------------------------------------
//----------------------------- PARAMETERS ----------------------------------
// Maximum send / receive payload size (static buffers size)
// Larger payloads will be rejected.
#define TF_MAX_PAYLOAD 1024
// --- Listener counts - determine sizes of the static slot tables ---
// Frame ID listeners (wait for response / multi-part message)
#define TF_MAX_ID_LST 20
// Frame Type listeners (wait for frame with a specific first payload byte)
#define TF_MAX_TYPE_LST 20
// Generic listeners (fallback if no other listener catches it)
#define TF_MAX_GEN_LST 4
// Timeout for receiving & parsing a frame
// ticks = number of calls to TF_Tick()
#define TF_PARSER_TIMEOUT_TICKS 10
//----------------------------- FRAME FORMAT ---------------------------------
// The format can be adjusted to fit your particular application needs
// If the connection is reliable, you can disable the SOF byte and checksums.
// That can save up to 9 bytes of overhead.
// ,-----+----+-----+------+------------+- - - -+------------,
// | SOF | ID | LEN | TYPE | HEAD_CKSUM | DATA | PLD_CKSUM |
// | 1 | ? | ? | ? | ? | ... | ? | <- size (bytes)
// '-----+----+-----+------+------------+- - - -+------------'
// !!! BOTH SIDES MUST USE THE SAME SETTINGS !!!
// Adjust sizes as desired (1,2,4)
#define TF_ID_BYTES 1
#define TF_LEN_BYTES 2
#define TF_TYPE_BYTES 1
// Select checksum type (0 = none, 8 = ~XOR, 16 = CRC16 0x8005, 32 = CRC32)
#define TF_CKSUM_TYPE 16
// Use a SOF byte to mark the start of a frame
#define TF_USE_SOF_BYTE 1
// Value of the SOF byte (if TF_USE_SOF_BYTE == 1)
#define TF_SOF_BYTE 0x01
//------------------------- End of user config ------------------------------
//region Resolve data types
#if TF_LEN_BYTES == 1
typedef uint8_t TF_LEN;
#elif TF_LEN_BYTES == 2
typedef uint16_t TF_LEN;
#elif TF_LEN_BYTES == 4
typedef uint32_t TF_LEN;
#else
#error Bad value of TF_LEN_BYTES, must be 1, 2 or 4
#endif
#if TF_TYPE_BYTES == 1
typedef uint8_t TF_TYPE;
#elif TF_TYPE_BYTES == 2
typedef uint16_t TF_TYPE;
#elif TF_TYPE_BYTES == 4
typedef uint32_t TF_TYPE;
#else
#error Bad value of TF_TYPE_BYTES, must be 1, 2 or 4
#endif
#if TF_ID_BYTES == 1
typedef uint8_t TF_ID;
#elif TF_ID_BYTES == 2
typedef uint16_t TF_ID;
#elif TF_ID_BYTES == 4
typedef uint32_t TF_ID;
#else
#error Bad value of TF_ID_BYTES, must be 1, 2 or 4
#endif
#if TF_CKSUM_TYPE == 8 || TF_CKSUM_TYPE == 0
// ~XOR (if 0, still use 1 byte - it won't be used)
typedef uint8_t TF_CKSUM;
#elif TF_CKSUM_TYPE == 16
// CRC16
typedef uint16_t TF_CKSUM;
#elif TF_CKSUM_TYPE == 32
// CRC32
typedef uint32_t TF_CKSUM;
#else
#error Bad value for TF_CKSUM_TYPE, must be 8, 16 or 32
#endif
// Bytes added to TF_MAX_PAYLOAD for the send buffer size.
#define TF_OVERHEAD_BYTES (1+sizeof(TF_ID)+sizeof(TF_LEN)+sizeof(TF_CKSUM)+sizeof(TF_TYPE)+sizeof(TF_CKSUM))
//endregion
//---------------------------------------------------------------------------
// Return value indicating error state
#define TF_ERROR -1
// Type-dependent masks for bit manipulation in the ID field
#define TF_ID_MASK (TF_ID)(((TF_ID)1 << (sizeof(TF_ID)*8 - 1)) - 1)
#define TF_ID_PEERBIT (TF_ID)((TF_ID)1 << ((sizeof(TF_ID)*8) - 1))
//---------------------------------------------------------------------------
/** Peer bit enum (used for init) */
typedef enum {
TF_SLAVE = 0,
TF_MASTER = 1
} TF_PEER;
/**
* TinyFrame Type Listener callback
* @param frame_id - ID of the received frame
* @param data - byte buffer with the application data
* @param len - number of bytes in the buffer
* @return true if the frame was consumed
*/
typedef bool (*TF_LISTENER)(TF_ID frame_id, TF_TYPE type, const uint8_t *data, TF_LEN len);
/**
* Initialize the TinyFrame engine.
* This can also be used to completely reset it (removing all listeners etc)
* @param peer_bit - peer bit to use for self
*/
void TF_Init(TF_PEER peer_bit);
/**
* Reset the frame parser state machine.
*/
void TF_ResetParser(void);
/**
* Accept incoming bytes & parse frames
* @param buffer - byte buffer to process
* @param count - nr of bytes in the buffer
*/
void TF_Accept(const uint8_t *buffer, size_t count);
/**
* Accept a single incoming byte
* @param c - a received char
*/
void TF_AcceptChar(uint8_t c);
/**
* Register a frame type listener.
* @param frame_type - frame ID to listen for
* @param cb - callback
* @return slot index (for removing), or TF_ERROR (-1)
*/
bool TF_AddIdListener(TF_ID frame_id, TF_LISTENER cb);
/**
* Remove a listener by the message ID it's registered for
* @param frame_id - the frame we're listening for
*/
bool TF_RemoveIdListener(TF_ID frame_id);
/**
* Register a frame type listener.
* @param frame_type - frame type to listen for
* @param cb - callback
* @return slot index (for removing), or TF_ERROR (-1)
*/
bool TF_AddTypeListener(TF_TYPE frame_type, TF_LISTENER cb);
/**
* Remove a listener by type.
* @param type - the type it's registered for
*/
bool TF_RemoveTypeListener(TF_TYPE type);
/**
* Register a generic listener.
* @param cb - callback
* @return slot index (for removing), or TF_ERROR (-1)
*/
bool TF_AddGenericListener(TF_LISTENER cb);
/**
* Remove a generic listener by function pointer
* @param cb - callback function to remove
*/
bool TF_RemoveGenericListener(TF_LISTENER cb);
/**
* Send a frame, and optionally attach an ID listener.
*
* @param type - message type
* @param data - data to send (can be NULL if 'data_len' is 0)
* @param data_len - nr of bytes to send
* @param listener - listener waiting for the response
* @param id_ptr - store the ID here, NULL to don't store.
* The ID may be used to unbind the listener after a timeout.
* @return success
*/
bool TF_Send(TF_TYPE type, const uint8_t *data, TF_LEN data_len,
TF_LISTENER listener,
TF_ID *id_ptr);
/**
* Like TF_Send(), but no data, just the type
*/
bool TF_Send0(TF_TYPE type, TF_LISTENER listener, TF_ID *id_ptr);
/**
* Like TF_Send(), but with just 1 data byte
*/
bool TF_Send1(TF_TYPE type, uint8_t b1,
TF_LISTENER listener,
TF_ID *id_ptr);
/**
* Like TF_Send(), but with just 2 data bytes
*/
bool TF_Send2(TF_TYPE type, uint8_t b1, uint8_t b2,
TF_LISTENER listener,
TF_ID *id_ptr);
/**
* Send a response to a received message.
*
* @param type - message type. If an ID listener is waiting for this response,
* then 'type' can be used to pass additional information.
* Otherwise, 'type' can be used to handle the message using a TypeListener.
* @param data - data to send
* @param data_len - nr of bytes to send
* @param frame_id - ID of the response frame (re-use ID from the original message)
* @return success
*/
bool TF_Respond(TF_TYPE type,
const uint8_t *data, TF_LEN data_len,
TF_ID frame_id);
/**
* 'Write bytes' function that sends data to UART
*
* ! Implement this in your application code !
*/
extern void TF_WriteImpl(const uint8_t *buff, TF_LEN len);
/**
* This function should be called periodically.
*
* The time base is used to time-out partial frames in the parser and
* automatically reset it.
*
* (suggestion - call this in a SysTick handler)
*/
void TF_Tick(void);
#endif