File syn_dlt645.c

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DL/T 645 Electricity Meter Communication Protocol Implementation.

• #include "syn_dlt645.h"
• #include "../util/syn_assert.h"
• #include <string.h>

Public Functions

Type	Name
uint8_t	syn_dlt645_calc_checksum (const uint8_t * buf, size_t len) Compute DL/T 645 arithmetic modulo-256 checksum over buffer.
void	syn_dlt645_decoder_feed (SYN_DLT645_Decoder * dec, uint8_t rx_byte) Feed a single byte into the streaming decoder.
void	syn_dlt645_decoder_init (SYN_DLT645_Decoder * dec, SYN_DLT645_Ver version, SYN_DLT645_FrameCallback cb, void * ctx) Initialize a streaming DL/T 645 decoder.
size_t	syn_dlt645_encode (const SYN_DLT645_Frame * frame, uint8_t * out_buf, size_t out_capacity) Encode a DL/T 645 frame into a binary transmission buffer.
SYN_Status	syn_dlt645_parse (const uint8_t * in_buf, size_t len, SYN_DLT645_Ver version, SYN_DLT645_Frame * out_frame) Parse a raw byte buffer into a DL/T 645 frame.

Public Functions Documentation

function syn_dlt645_calc_checksum

Compute DL/T 645 arithmetic modulo-256 checksum over buffer.

uint8_t syn_dlt645_calc_checksum (
    const uint8_t * buf,
    size_t len
) 

Parameters:

• buf Buffer starting from SOF (0x68).
• len Length of buffer from SOF to end of data field.

Returns:

Modulo-256 checksum byte.

---

function syn_dlt645_decoder_feed

Feed a single byte into the streaming decoder.

void syn_dlt645_decoder_feed (
    SYN_DLT645_Decoder * dec,
    uint8_t rx_byte
) 

Parameters:

• dec Decoder instance.
• rx_byte Single byte received from UART ISR.

---

function syn_dlt645_decoder_init

Initialize a streaming DL/T 645 decoder.

void syn_dlt645_decoder_init (
    SYN_DLT645_Decoder * dec,
    SYN_DLT645_Ver version,
    SYN_DLT645_FrameCallback cb,
    void * ctx
) 

Parameters:

• dec Decoder instance.
• version Expected protocol version.
• cb Frame received callback.
• ctx User callback context.

---

function syn_dlt645_encode

Encode a DL/T 645 frame into a binary transmission buffer.

size_t syn_dlt645_encode (
    const SYN_DLT645_Frame * frame,
    uint8_t * out_buf,
    size_t out_capacity
) 

Parameters:

• frame Input frame data.
• out_buf Destination output buffer.
• out_capacity Output buffer capacity (min 20 bytes).

Returns:

Number of bytes written to out_buf (0 on error).

---

function syn_dlt645_parse

Parse a raw byte buffer into a DL/T 645 frame.

SYN_Status syn_dlt645_parse (
    const uint8_t * in_buf,
    size_t len,
    SYN_DLT645_Ver version,
    SYN_DLT645_Frame * out_frame
) 

Parameters:

• in_buf Input buffer containing the complete frame.
• len Length of input buffer.
• version Protocol version expected (1997 or 2007).
• out_frame Destination frame struct.

Returns:

SYN_OK on success, SYN_INVALID_PARAM or SYN_ERROR on validation failure.

---

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The documentation for this class was generated from the following file src/syntropic/proto/syn_dlt645.c