GEX port to STM32F072. This is currently the main port.
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gex-f072/GexUnits/fcap/unit_fcap.c

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10 KiB

//
// Created by MightyPork on 2017/11/25.
//
#include "unit_base.h"
#include "unit_fcap.h"
#define FCAP_INTERNAL
#include "_fcap_internal.h"
// ------------------------------------------------------------------------
enum FcapCmd_ {
CMD_STOP = 0,
// Measuring a waveform
CMD_INDIRECT_CONT_START = 1, // keep measuring, read on demand
CMD_INDIRECT_BURST_START = 2, // wait and reply
// Counting pulses
CMD_DIRECT_CONT_START = 3, // keep measuring, read on demand
CMD_DIRECT_BURST_START = 4, // wait and reply
CMD_FREECOUNT_START = 5, // keep counting pulses until stopped, read on reply
CMD_MEASURE_SINGLE_PULSE = 6, // measure the first incoming pulse of the right polarity. NOTE: can glitch if the signal starts in the active level
CMD_FREECOUNT_CLEAR = 7, // clear the free counter, return last value
// Results readout for continuous modes
CMD_INDIRECT_CONT_READ = 10,
CMD_DIRECT_CONT_READ = 11,
CMD_FREECOUNT_READ = 12,
// configs
CMD_SET_POLARITY = 20,
CMD_SET_DIR_PRESC = 21,
CMD_SET_INPUT_FILTER = 22,
CMD_SET_DIR_MSEC = 23,
// go back to the configured settings
CMD_RESTORE_DEFAULTS = 30,
};
/** Handle a request message */
static error_t UFCAP_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
{
uint8_t presc;
uint16_t msec;
struct priv *priv = unit->data;
PayloadBuilder pb = pb_start(unit_tmp512, UNIT_TMP_LEN, NULL);
const char* msg_denied_on_pin = "Not available on the selected pin!";
switch (command) {
/**
* Stop any ongoing measurement and return to base state.
*/
case CMD_STOP:
UFCAP_SwitchMode(unit, OPMODE_IDLE);
return E_SUCCESS;
// ----------------------- CONFIG --------------------------
/**
* Set the active polarity, or triggering edge (for direct)
*
* pld: pol:u8 (0,1)
*/
case CMD_SET_POLARITY:
{
priv->active_level = pp_bool(pp);
}
return E_SUCCESS;
/**
* Set the direct measurement prescaller 1,2,4,8
*
* pld: presc:u8
*/
case CMD_SET_DIR_PRESC:
{
presc = pp_u8(pp);
if (presc != 1 && presc != 2 && presc != 4 && presc != 8) return E_BAD_VALUE;
priv->direct_presc = presc;
}
return E_SUCCESS;
/**
* Set the input filter for all modes
*
* pld: filter:u8 (0-15)
*/
case CMD_SET_INPUT_FILTER:
{
uint8_t input_filter = pp_u8(pp);
if (input_filter >= 16) return E_BAD_VALUE;
priv->dfilter = input_filter;
}
return E_SUCCESS;
/**
* Set the direct sampling time.
*
* pld: msec:u16
*/
case CMD_SET_DIR_MSEC:
{
msec = pp_u16(pp);
priv->direct_msec = msec;
}
return E_SUCCESS;
/**
* Reset all SET* settings to their default values, stop any ongoing measure.
*/
case CMD_RESTORE_DEFAULTS:
UFCAP_SwitchMode(unit, OPMODE_IDLE);
priv->active_level = priv->conf.active_level;
priv->direct_presc = priv->conf.direct_presc;
priv->direct_msec = priv->conf.direct_msec;
priv->dfilter = priv->conf.dfilter;
return E_SUCCESS;
// ------------------ COMMANDS ------------------------
/**
* Start indirect continuous measurement.
*/
case CMD_INDIRECT_CONT_START:
if (priv->opmode == OPMODE_INDIRECT_CONT) return E_SUCCESS; // no-op
if (priv->opmode != OPMODE_IDLE) return E_BUSY;
UFCAP_SwitchMode(unit, OPMODE_INDIRECT_CONT);
return E_SUCCESS;
/**
* Start a continuous direct measurement (counting pulses in fixed time intervals)
*
* - meas_time_ms 0 = no change
* - prescaller 0 = no change
*
* pld: meas_time_ms:u16, prescaller:u8
* - prescaller is 1,2,4,8; 0 = no change
*/
case CMD_DIRECT_CONT_START:
if (!priv->a_direct) {
// This works only if we use the ETR pin. TIM2 shares CH1 with ETR.
// If CH2 is selected as input, ETR is not available.
com_respond_str(MSG_ERROR, frame_id, msg_denied_on_pin);
return E_FAILURE;
}
if (priv->opmode == OPMODE_DIRECT_CONT) return E_SUCCESS; // no-op
if (priv->opmode != OPMODE_IDLE) return E_BUSY;
msec = pp_u16(pp);
presc = pp_u8(pp);
if (msec != 0) priv->direct_msec = msec;
if (presc != 0) priv->direct_presc = presc;
UFCAP_SwitchMode(unit, OPMODE_DIRECT_CONT);
return E_SUCCESS;
/**
* Start a burst of direct measurements with averaging.
* The measurement is performed on N consecutive pulses.
*
* pld: count:u16
*
* resp: core_mhz:u16, count:u16, period_sum:u64, ontime_sum:u64
*/
case CMD_INDIRECT_BURST_START:
if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
priv->ind_burst.n_target = pp_u16(pp);
priv->request_id = frame_id;
UFCAP_SwitchMode(unit, OPMODE_INDIRECT_BURST);
return E_SUCCESS;
/**
* Start a single direct measurement of the given length (pulses in time period)
* If 'prescaller' is not 0, it is changed via the param field.
*
* pld: meas_time_ms:u16, prescaller:u8
* - prescaller is 1,2,4,8; 0 = no change
*
* resp: prescaller:u8, meas_time_ms:u16, pulse_count:u32
*/
case CMD_DIRECT_BURST_START:
if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
priv->dir_burst.msec = pp_u16(pp);
presc = pp_u8(pp);
if (presc != 0) priv->direct_presc = presc;
priv->request_id = frame_id;
UFCAP_SwitchMode(unit, OPMODE_DIRECT_BURST);
return E_SUCCESS;
/**
* Measure a single pulse length of the given polarity.
* Measures time from a rising to a falling edge (or falling to rising, if polarity is 0)
*
* resp: core_mhz:u16, ontime:u32
*/
case CMD_MEASURE_SINGLE_PULSE:
if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
priv->request_id = frame_id;
UFCAP_SwitchMode(unit, OPMODE_SINGLE_PULSE);
return E_SUCCESS;
/**
* Start a free-running pulse counter.
*
* pld: prescaller:u8
* - prescaller is 1,2,4,8; 0 = no change
*/
case CMD_FREECOUNT_START:
if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
presc = pp_u8(pp);
if (presc != 0) priv->direct_presc = presc;
UFCAP_SwitchMode(unit, OPMODE_FREE_COUNTER);
return E_SUCCESS;
/**
* Reset the free-running pulse counter.
*
* resp: last_val:u32
*/
case CMD_FREECOUNT_CLEAR:
if (priv->opmode != OPMODE_FREE_COUNTER) {
return E_BAD_MODE;
}
pb_u32(&pb, UFCAP_FreeCounterClear(unit));
com_respond_pb(frame_id, MSG_SUCCESS, &pb);
return E_SUCCESS;
// ------------------ READING ---------------------
/**
* Read the most recent pulse measurement during continuous indirect measure.
*
* resp: core_mhz:u16, period:u32, ontime:u32
*/
case CMD_INDIRECT_CONT_READ:
if (priv->opmode != OPMODE_INDIRECT_CONT) {
return E_BAD_MODE;
}
if (priv->ind_cont.last_period == 0) {
return E_BUSY;
}
pb_u16(&pb, PLAT_AHB_MHZ);
pb_u32(&pb, priv->ind_cont.last_period);
pb_u32(&pb, priv->ind_cont.last_ontime);
com_respond_pb(frame_id, MSG_SUCCESS, &pb);
return E_SUCCESS;
/**
* Read the most recent result of a continuous direct measurement.
*
* resp: prescaller:u8, meas_time_ms:u16, pulse_count:u32
*/
case CMD_DIRECT_CONT_READ:
if (!priv->a_direct) { // see above
com_respond_str(MSG_ERROR, frame_id, msg_denied_on_pin);
return E_FAILURE;
}
if (priv->opmode != OPMODE_DIRECT_CONT) return E_BAD_MODE;
if (priv->dir_cont.last_count == 0) return E_BUSY;
pb_u8(&pb, priv->direct_presc);
pb_u16(&pb, priv->direct_msec);
pb_u32(&pb, priv->dir_cont.last_count);
com_respond_pb(frame_id, MSG_SUCCESS, &pb);
return E_SUCCESS;
/**
* Read the current value of the free-running pulse counter.
*
* The timing may have a significant jitter, this function is practically useful only for
* slow pulse sources (like a geiger counter, item counting etc)
*
* resp: count:u32
*/
case CMD_FREECOUNT_READ:
if (priv->opmode != OPMODE_FREE_COUNTER) {
return E_BAD_MODE;
}
pb_u32(&pb, UFCAP_GetFreeCounterValue(unit));
com_respond_pb(frame_id, MSG_SUCCESS, &pb);
return E_SUCCESS;
default:
return E_UNKNOWN_COMMAND;
}
}
// ------------------------------------------------------------------------
/** Frequency capture */
const UnitDriver UNIT_FCAP = {
.name = "FCAP",
.description = "Frequency and pulse measurement",
// Settings
.preInit = UFCAP_preInit,
.cfgLoadBinary = UFCAP_loadBinary,
.cfgWriteBinary = UFCAP_writeBinary,
.cfgLoadIni = UFCAP_loadIni,
.cfgWriteIni = UFCAP_writeIni,
// Init
.init = UFCAP_init,
.deInit = UFCAP_deInit,
// Function
.handleRequest = UFCAP_handleRequest,
};