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Document the packet_mod interface

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Thomas Kolb 2021-10-17 22:51:10 +02:00
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commit 6c21618f1f
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127
impl/src/packet_mod.h
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@ -34,18 +34,145 @@ typedef struct
} packet_mod_ctx_t;
/*!\brief Initialize the packet modulator context.
*
* \param[inout] ctx The context to initialize.
* \returns An result code (see results.h).
*/
result_t packet_mod_init(packet_mod_ctx_t *ctx);
/*!\brief Free all resources in the given context.
*
* \param[inout] ctx The context to free.
* \returns An result code (see results.h).
*/
result_t packet_mod_free(packet_mod_ctx_t *ctx);
/*!\brief Set the raw packet data.
*
* In this step, the CRC of the data is calculated.
*
* This is the first step in packet processing. The context must be freshly
* initialized.
*
* The stored data can be retrieved for verification using \ref
* packet_mod_get_result_b().
*
* \param[inout] ctx The context to use for this operation.
* \returns An result code (see results.h).
*/
result_t packet_mod_set_data(packet_mod_ctx_t *ctx, const unsigned char *data, size_t length);
/*!\brief Channel-code the stored packet data.
*
* This can only be called after \ref packet_mod_set_data().
*
* The resulting data can be retrieved for verification using \ref
* packet_mod_get_result_b().
*
* \param[inout] ctx The context to use for this operation.
* \returns An result code (see results.h).
*/
result_t packet_mod_encode(packet_mod_ctx_t *ctx);
/*!\brief Modulate the packet data.
*
* This can be called after \ref packet_mod_set_data() or \ref
* packet_mod_encode().
*
* The resulting data can be retrieved for verification using \ref
* packet_mod_get_result_cf().
*
* \param[inout] ctx The context to use for this operation.
* \returns An result code (see results.h).
*/
result_t packet_mod_modulate(packet_mod_ctx_t *ctx);
/*!\brief Add a channel-coded and modulated packet header.
*
* The header contains the length of the data part (in symbols) and the CRC of
* the original raw data. The channel coding scheme and modulation are
* different than for the actual packet data, see \ref HEADER_CHANNEL_CODING
* and \ref HEADER_MODULATION. These settings should be chosen to be slightly
* more robust than the actual data encoding and modulation.
*
* This can only be called after \ref packet_mod_modulate().
*
* The resulting data can be retrieved for verification using \ref
* packet_mod_get_result_cf().
*
* \param[inout] ctx The context to use for this operation.
* \returns An result code (see results.h).
*/
result_t packet_mod_add_header(packet_mod_ctx_t *ctx);
/*!\brief Add the preamble to the packet.
*
* The preamble is one cycle of a m-sequence, modulated using BPSK. Adding such
* a preamble allows to find the packet start time and further signal
* parameters such as phase offset using cross-correlation at the receiver.
*
* This can only be called after \ref packet_mod_add_header().
*
* The resulting data can be retrieved using \ref packet_mod_get_result_cf().
*
* \param[inout] ctx The context to use for this operation.
* \returns An result code (see results.h).
*/
result_t packet_mod_add_preamble(packet_mod_ctx_t *ctx);
/*!\brief Dump the internal data to the given file.
*
* The format of the resulting file depends on the current state of the packet
* modulation context.
*
* \param[in] ctx The context to use for this operation.
* \param[in] filename Name of the file to write to.
* \returns An result code (see results.h).
*/
result_t packet_mod_dump(packet_mod_ctx_t *ctx, const char *filename);
/*!\brief Get the result data as raw bytes.
*
* Raw bytes can be retrieved after \ref packet_mod_set_data() and \ref
* packet_mod_encode(). In all other states, this returns ERR_INVALID_STATE.
*
* \param[in] ctx The context to use for this operation.
* \param[out] data A pointer to the memory location where the data should be written.
* \param[inout length A pointer to the data length (in array items). The
* value shall be set to the size of the data buffer.
* After the call, it is set to the required buffer size
* (if \ref data is NULL or the length is not sufficient)
* or the number of items actually written to \ref data.
* \retval OK If the data was copied successfully or \ref data was
* NULL. In the latter case, only \ref length is modified
* to the required buffer size.
* \retval ERR_NO_MEM If the \ref length was not sufficient for the data.
* \retval ERR_INVALID_STATE If byte data is unavailable in the current state.
*/
result_t packet_mod_get_result_b(packet_mod_ctx_t *ctx, unsigned char *data, size_t *length);
/*!\brief Get the result data as complex numbers.
*
* Complex numbers can be retrieved after \ref packet_mod_modulate(), \ref
* packet_mod_add_header() and \ref packet_mod_add_preamble(). In all other
* states, this returns ERR_INVALID_STATE.
*
* \param[in] ctx The context to use for this operation.
* \param[out] data A pointer to the memory location where the data should be written.
* \param[inout length A pointer to the data length (in array items). The
* value shall be set to the size of the data buffer.
* After the call, it is set to the required buffer size
* (if \ref data is NULL or the length is not sufficient)
* or the number of items actually written to \ref data.
* \retval OK If the data was copied successfully or \ref data was
* NULL. In the latter case, only \ref length is modified
* to the required buffer size.
* \retval ERR_NO_MEM If the \ref length was not sufficient for the data.
* \retval ERR_INVALID_STATE If byte data is unavailable in the current state.
*/
result_t packet_mod_get_result_cf(packet_mod_ctx_t *ctx, float complex *data, size_t *length);
#endif // PACKET_MOD