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70 lines
1.8 KiB
70 lines
1.8 KiB
#ifndef SAMPLING_H
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#define SAMPLING_H
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#include <esp8266.h>
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#include <httpd.h>
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#include "datalink.h"
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#define SAMP_READOUT_TMEO 500
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typedef struct {
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uint32_t count;
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float freq; // actual frequency - not exact due to the prescaller limitations
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float min;
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float max;
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float rms;
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} MeasStats;
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typedef enum {
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RAW = DG_REQUEST_RAW, // same as the SBMP packet numbers used to request it
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FFT = DG_REQUEST_FFT
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} MEAS_FORMAT;
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/**
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* Reading procedure
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* -----------------
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*
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* 1. meas_request_data(count)
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* 2. wait for meas_chunk_ready() == true
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* 3. meas_get_chunk() to read the chunk last received
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* 4. if meas_is_last_chunk(), call meas_close() and DONE.
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* 5. meas_request_next_chunk() to get more data, goto 2
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*
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* Waiting should have a timeout, if data not received, return error status to client.
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*/
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/** Estimate time needed for sampling (with some space) */
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uint32_t meas_estimate_duration(uint32_t count,uint32_t freq);
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/** Request data from the sampling module. Count - number of samples. */
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bool meas_request_data(MEAS_FORMAT format, uint16_t count, uint32_t freq); // TODO specify what kind of data - currently direct samples.
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/** request next chunk */
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void meas_request_next_chunk(void);
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/** Check if chunk ready to be read */
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bool meas_chunk_ready(void);
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/** Check if closed (if data was expected, this means the peer aborted the transaction) */
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bool meas_is_closed(void);
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/** Get the stats struct */
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MeasStats *meas_get_stats(void);
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/**
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* @brief Get received chunk. NULL if none.
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*
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* The array is valid until next chunk is requested.
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* Chunk length in bytes is stored in the argument.
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*/
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uint8_t *meas_get_chunk(uint16_t *chunk_len);
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/** Check if this was the last chunk */
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bool meas_is_last_chunk(void);
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/** Terminate the readout. */
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void meas_close(void);
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#endif // SAMPLING_H
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