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