ESP8266 part of the f105-motor-demo project (see f105-motor-demo_stm32)
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f105-motor-demo_esp/user/sampling.h

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#ifndef SAMPLING_H
#define SAMPLING_H
#include <esp8266.h>
#include <httpd.h>
#include "datalink.h"
// ms
#define SAMP_RD_TMEO 300
#define SAMP_RD_RETRY_COUNT 3
#define SAMP_RD_TMEO_TOTAL (SAMP_RD_TMEO*SAMP_RD_RETRY_COUNT+200)
typedef struct {
uint32_t count;
float freq; // actual frequency - not exact due to the prescaller limitations
float min;
float max;
float rms;
} MeasStats;
typedef enum {
RAW = DG_REQUEST_RAW, // same as the SBMP packet numbers used to request it
FFT = DG_REQUEST_FFT
} MEAS_FORMAT;
/**
* Reading procedure
* -----------------
*
* 1. meas_request_data(count)
* 2. wait for meas_chunk_ready() == true
* 3. meas_get_chunk() to read the chunk last received
* 4. if meas_is_last_chunk(), call meas_close() and DONE.
* 5. meas_request_next_chunk() to get more data, goto 2
*
* Waiting should have a timeout, if data not received, return error status to client.
*/
/** Estimate time needed for sampling (with some space) */
uint32_t meas_estimate_duration(uint32_t count,uint32_t freq);
/** Request data from the sampling module. Count - number of samples. */
bool meas_request_data(MEAS_FORMAT format, uint16_t count, uint32_t freq); // TODO specify what kind of data - currently direct samples.
/** request next chunk */
void meas_request_next_chunk(void);
/** Check if chunk ready to be read */
bool meas_chunk_ready(void);
/** Check if closed (if data was expected, this means the peer aborted the transaction) */
bool meas_is_closed(void);
/** Get the stats struct */
MeasStats *meas_get_stats(void);
/**
* @brief Get received chunk. NULL if none.
*
* The array is valid until next chunk is requested.
* Chunk length in bytes is stored in the argument.
*/
uint8_t *meas_get_chunk(uint16_t *chunk_len);
/** Check if this was the last chunk */
bool meas_is_last_chunk(void);
/** Terminate the readout. */
void meas_close(void);
/** Wait for one chunk, with possible retries. True = chunk ready, false = failed. */
bool meas_wait_for_chunk(void);
#endif // SAMPLING_H