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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/nlr.h"
#include "py/mperrno.h"
#include "py/runtime.h"
#include "py/binary.h"
#include "py/mphal.h"
#include "shared-bindings/touchio/TouchIn.h"
#include "tick.h"
#include "adafruit_ptc.h"
static uint16_t get_raw_reading(touchio_touchin_obj_t *self) {
adafruit_ptc_start_conversion(PTC, &self->config);
while (!adafruit_ptc_is_conversion_finished(PTC)) {
// wait
#ifdef MICROPY_VM_HOOK_LOOP
MICROPY_VM_HOOK_LOOP
#endif
}
return adafruit_ptc_get_conversion_result(PTC);
}
void common_hal_touchio_touchin_construct(touchio_touchin_obj_t* self,
const mcu_pin_obj_t *pin) {
if (!pin->has_touch) {
mp_raise_ValueError("Invalid pin");
}
claim_pin(pin);
/* Setup and enable generic clock source for PTC module. */
struct system_gclk_chan_config gclk_chan_conf;
system_gclk_chan_get_config_defaults(&gclk_chan_conf);
gclk_chan_conf.source_generator = GCLK_GENERATOR_3;
system_gclk_chan_set_config(PTC_GCLK_ID, &gclk_chan_conf);
system_gclk_chan_enable(PTC_GCLK_ID);
system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, PM_APBCMASK_PTC);
adafruit_ptc_get_config_default(&self->config);
self->config.pin = pin->pin;
self->config.yline = pin->touch_y_line;
adafruit_ptc_init(PTC, &self->config);
self->threshold = 2 * get_raw_reading(self);
}
void common_hal_touchio_touchin_deinit(touchio_touchin_obj_t* self) {
// TODO(tannewt): Reset the PTC.
reset_pin(self->pin->pin);
}
void touchin_reset() {
// TODO(tannewt): Reset the PTC.
}
bool common_hal_touchio_touchin_get_value(touchio_touchin_obj_t *self) {
uint16_t reading = get_raw_reading(self);
return reading > self->threshold;
}
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