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161 lines
6.4 KiB
161 lines
6.4 KiB
//
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// Created by MightyPork on 2018/02/03.
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//
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// Defines and prototypes used internally by the ADC unit.
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//
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#ifndef GEX_F072_ADC_INTERNAL_H
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#define GEX_F072_ADC_INTERNAL_H
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#ifndef ADC_INTERNAL
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#error bad include!
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#endif
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#include "unit_base.h"
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//#define adc_dbg dbg
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#define adc_dbg(...) do {} while(0)
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#define UADC_MAX_FREQ_FOR_AVERAGING 20000
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#define UADC_MAX_CHANNEL 17
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enum uadc_opmode {
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ADC_OPMODE_UNINIT, //!< Not yet switched to any mode
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ADC_OPMODE_IDLE, //!< Idle. Allows immediate value readout and averaging.
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ADC_OPMODE_REARM_PENDING, //!< Idle, waiting for the next sample to re-arm (auto trigger).
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ADC_OPMODE_ARMED, //!< Armed for a trigger. Direct access and averaging are disabled.
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ADC_OPMODE_TRIGD, //!< Triggered, sending pre-trigger and streaming captured data.
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ADC_OPMODE_BLCAP, //!< Capture of fixed length without a trigger
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ADC_OPMODE_STREAM, //!< Unlimited capture
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ADC_OPMODE_EMERGENCY_SHUTDOWN, //!< Used when the buffers overrun to safely transition to IDLE after a delay
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};
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enum uadc_event {
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EVT_CAPT_START = 50, //!< Capture start (used in event in the first frame when trigger is detected)
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EVT_CAPT_MORE = 51, //!< Capture data payload (used as TYPE for all capture types)
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EVT_CAPT_DONE = 52, //!< End of trig'd or block capture payload (last frame with data),
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//!< or a farewell message after closing stream using abort(), in this case without data.
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};
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/** Private data structure */
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struct priv {
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struct {
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uint32_t channels; //!< bit flags (will be recorded in order 0-15)
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uint8_t sample_time; //!< 0-7 (corresponds to 1.5-239.5 cycles) - time for the sampling capacitor to charge
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uint32_t frequency; //!< Timer frequency in Hz. Note: not all frequencies can be achieved accurately
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uint32_t buffer_size; //!< Buffer size in bytes (count 2 bytes per channel per measurement) - faster sampling freq needs bigger buffer
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uint16_t averaging_factor; //!< Exponential averaging factor 0-1000
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bool enable_averaging;
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} cfg;
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// Peripherals
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ADC_TypeDef *ADCx; //!< The ADC peripheral used
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ADC_Common_TypeDef *ADCx_Common; //!< The ADC common control block
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TIM_TypeDef *TIMx; //!< ADC timing timer instance
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DMA_TypeDef *DMAx; //!< DMA isnatnce used
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uint8_t dma_chnum; //!< DMA channel number
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DMA_Channel_TypeDef *DMA_CHx; //!< DMA channel instance
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uint8_t channel_nums[18];
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// Live config
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float real_frequency;
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uint32_t real_frequency_int;
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uint32_t channels_mask; //!< channels bitfield including tsense and vref
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float avg_factor_as_float;
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uint16_t *dma_buffer; //!< malloc'd buffer for the samples
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uint8_t nb_channels; //!< nbr of enabled adc channels
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uint32_t buf_itemcount; //!< real size of the buffer in samples (adjusted to fit 2x whole multiple of sample group)
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// Trigger state
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uint32_t trig_stream_remain; //!< Counter of samples remaining to be sent in the post-trigger stream
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uint16_t trig_holdoff_remain; //!< Tmp counter for the currently active hold-off
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uint16_t trig_prev_level; //!< Value of the previous sample, used to detect trigger edge
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uint32_t stream_startpos; //!< Byte offset in the DMA buffer where the next capture for a stream should start.
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//!< Updated in TH/TC and on trigger (after the preceding data is sent as a pretrig buffer)
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enum uadc_opmode opmode; //!< OpMode (state machine state)
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float averaging_bins[18]; //!< Averaging buffers, enough space to accommodate all channels (16 external + 2 internal)
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uint16_t last_samples[18]; //!< If averaging is disabled, the last captured sample is stored here.
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// Trigger config
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uint8_t trigger_source; //!< number of the pin selected as a trigger source
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uint32_t pretrig_len; //!< Pre-trigger length, nbr of historical samples to report when trigger occurs
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uint32_t trig_len; //!< Trigger length, nbr of samples to report AFTER a trigger occurs
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uint16_t trig_level; //!< Triggering level in LSB
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uint8_t trig_edge; //!< Which edge we want to trigger on. 1-rising, 2-falling, 3-both
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bool auto_rearm; //!< Flag that the trigger should be re-armed after the stream finishes
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uint16_t trig_holdoff; //!< Trigger hold-off time, set when configuring the trigger
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TF_ID stream_frame_id; //!< Session ID for multi-part stream (response or report)
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uint8_t stream_serial; //!< Serial nr of a stream frame
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bool tc_pending;
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bool ht_pending;
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};
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/** Allocate data structure and set defaults */
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error_t UADC_preInit(Unit *unit);
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/** Load from a binary buffer stored in Flash */
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void UADC_loadBinary(Unit *unit, PayloadParser *pp);
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/** Write to a binary buffer for storing in Flash */
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void UADC_writeBinary(Unit *unit, PayloadBuilder *pb);
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// ------------------------------------------------------------------------
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/** Parse a key-value pair from the INI file */
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error_t UADC_loadIni(Unit *unit, const char *key, const char *value);
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/** Generate INI file section for the unit */
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void UADC_writeIni(Unit *unit, IniWriter *iw);
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// ------------------------------------------------------------------------
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/** Finalize unit set-up */
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error_t UADC_init(Unit *unit);
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/** Tear down the unit */
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void UADC_deInit(Unit *unit);
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/** Configure DMA (buffer count etc) */
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void UADC_SetupDMA(Unit *unit);
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// ------------------------------------------------------------------------
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/** DMA half/complete handler */
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void UADC_DMA_Handler(void *arg);
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/** ADC eod of sequence handler */
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void UADC_ADC_EOS_Handler(void *arg);
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/** Switch to a different opmode */
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void UADC_SwitchMode(Unit *unit, enum uadc_opmode new_mode);
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/** Handle trigger - process pre-trigger and start streaming the requested number of samples */
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void UADC_HandleTrigger(Unit *unit, uint8_t edge_type, uint64_t timestamp);
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/** Handle a periodic tick - expiring the hold-off */
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void UADC_updateTick(Unit *unit);
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/** Send a end-of-stream message to PC's stream listener so it can shut down. */
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void UADC_ReportEndOfStream(Unit *unit);
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/** Start a block capture */
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void UADC_StartBlockCapture(Unit *unit, uint32_t len, TF_ID frame_id);
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/** Start stream */
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void UADC_StartStream(Unit *unit, TF_ID frame_id);
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/** End stream */
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void UADC_StopStream(Unit *unit);
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/** Configure frequency */
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error_t UADC_SetSampleRate(Unit *unit, uint32_t hertz);
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/** Abort capture */
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void UADC_AbortCapture(Unit *unit);
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#endif //GEX_F072_ADC_INTERNAL_H
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