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gex-core/units/touch/unit_touch.c

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//
// Created by MightyPork on 2017/11/25.
//
#include "unit_base.h"
#include "unit_touch.h"
#define TOUCH_INTERNAL
#include "_touch_internal.h"
// ------------------------------------------------------------------------
enum TouchCmd_ {
CMD_READ=0,
CMD_SET_BIN_THR=1,
CMD_DISABLE_ALL_REPORTS=2,
CMD_SET_DEBOUNCE_TIME=3,
CMD_SET_HYSTERESIS=4,
CMD_GET_CH_COUNT=10,
};
/** Handle a request message */
static error_t UTOUCH_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
{
struct priv* priv = unit->data;
PayloadBuilder pb = pb_start(unit_tmp512, UNIT_TMP_LEN, NULL);
switch (command) {
/**
* read the current touch pad values (smaller = higher capacity)
*
* resp: a list of u16 (order: group and pin, ascending)
*/
case CMD_READ:
if (priv->status == UTSC_STATUS_BUSY) return E_BUSY;
if (priv->status == UTSC_STATUS_FAIL) return E_HW_TIMEOUT;
for (int i = 0; i < 32; i++) {
if (priv->all_channels_mask & (1<<i)) {
pb_u16(&pb, priv->readouts[i]);
}
}
com_respond_pb(frame_id, MSG_SUCCESS, &pb);
return E_SUCCESS;
/**
* Set thresholds for the button mode.
*
* pld: a list of u16 for the enabled channels (order: group and pin, ascending)
*/
case CMD_SET_BIN_THR:
for (int i = 0; i < 32; i++) {
if (priv->all_channels_mask & (1<<i)) {
priv->bin_trig_cnt[i] = 0;
priv->binary_thr[i] = pp_u16(pp);
if (priv->readouts[i] >= (priv->binary_thr[i] + priv->binary_hysteresis)) {
priv->binary_active_bits |= 1<<i;
}
}
}
return E_SUCCESS;
/**
* Set the debounce time in ms (replaces the default value from settings)
*
* pld: ms:u16
*/
case CMD_SET_DEBOUNCE_TIME:
priv->binary_debounce_ms = pp_u16(pp);
return E_SUCCESS;
/**
* Set hysteresis (replaces the default value from settings)
*
* Hysteresis is added to the threshold value for the switch-off level
* (switch-off happens when the measured value is exceeded - capacity of the pad drops)
*
* pld: hyst:u16
*/
case CMD_SET_HYSTERESIS:
priv->binary_hysteresis = pp_u16(pp);
return E_SUCCESS;
/**
* Disable button mode reports. This effectively sets all thresholds to 0, disabling checking.
*/
case CMD_DISABLE_ALL_REPORTS:
for (int i = 0; i < 32; i++) {
if (priv->all_channels_mask & (1<<i)) {
priv->binary_thr[i] = 0;
priv->bin_trig_cnt[i] = 0;
}
}
priv->binary_active_bits = 0;
return E_SUCCESS;
/**
* Get the number of configured touch pad channels
*
* resp: count:u8
*/
case CMD_GET_CH_COUNT:;
uint8_t nb = 0;
for (int i = 0; i < 32; i++) {
if (priv->all_channels_mask & (1<<i)) {
nb++;
}
}
pb_u8(&pb, nb);
com_respond_pb(frame_id, MSG_SUCCESS, &pb);
return E_SUCCESS;
default:
return E_UNKNOWN_COMMAND;
}
}
// ------------------------------------------------------------------------
/** Unit template */
const UnitDriver UNIT_TOUCH = {
.name = "TOUCH",
.description = "Capacitive touch sensing",
// Settings
.preInit = UTOUCH_preInit,
.cfgLoadBinary = UTOUCH_loadBinary,
.cfgWriteBinary = UTOUCH_writeBinary,
.cfgLoadIni = UTOUCH_loadIni,
.cfgWriteIni = UTOUCH_writeIni,
// Init
.init = UTOUCH_init,
.deInit = UTOUCH_deInit,
// Function
.handleRequest = UTOUCH_handleRequest,
.updateTick = UTOUCH_updateTick,
};