145 lines
4.5 KiB
C
145 lines
4.5 KiB
C
/*
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* This file is part of the MicroPython 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/microcontroller/Pin.h"
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#include "shared-bindings/touchio/TouchIn.h"
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#include "supervisor/shared/translate/translate.h"
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// Native touchio only exists for SAMD21
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#ifdef SAMD21
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#include "hpl/pm/hpl_pm_base.h"
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#include "samd/clocks.h"
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#include "samd/pins.h"
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#include "adafruit_ptc.h"
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bool touch_enabled = false;
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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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RUN_BACKGROUND_TASKS;
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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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raise_ValueError_invalid_pin();
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}
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claim_pin(pin);
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// Turn on the PTC if its not in use. We won't turn it off until reset.
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if (((Ptc *)PTC)->CTRLA.bit.ENABLE == 0) {
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// We run the PTC at 8mhz so divide the 48mhz clock by 6.
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uint8_t gclk = find_free_gclk(6);
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if (gclk > GCLK_GEN_NUM) {
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mp_raise_RuntimeError(translate("No free GCLKs"));
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}
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enable_clock_generator(gclk, CLOCK_48MHZ, 6);
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/* Setup and enable generic clock source for PTC module. */
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connect_gclk_to_peripheral(gclk, PTC_GCLK_ID);
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_pm_enable_bus_clock(PM_BUS_APBC, PTC);
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}
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adafruit_ptc_get_config_default(&self->config);
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self->config.pin = pin->number;
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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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// Initial values for pins will vary, depending on what peripherals the pins
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// share on-chip.
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//
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// Set a "touched" threshold not too far above the initial value.
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// For simple finger touch, the values may vary as much as a factor of two,
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// but for touches using fruit or other objects, the difference is much less.
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self->threshold = get_raw_reading(self) + 100;
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}
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bool common_hal_touchio_touchin_deinited(touchio_touchin_obj_t *self) {
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return self->config.pin == NO_PIN;
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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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if (common_hal_touchio_touchin_deinited(self)) {
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return;
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}
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// We leave the clocks running because they may be in use by others.
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reset_pin_number(self->config.pin);
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self->config.pin = NO_PIN;
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}
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void touchin_reset() {
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Ptc *ptc = ((Ptc *)PTC);
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if (ptc->CTRLA.bit.ENABLE == 1) {
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ptc->CTRLA.bit.ENABLE = 0;
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while (ptc->CTRLA.bit.ENABLE == 1) {
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}
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ptc->CTRLA.bit.SWRESET = 1;
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while (ptc->CTRLA.bit.SWRESET == 1) {
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}
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}
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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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uint16_t common_hal_touchio_touchin_get_raw_value(touchio_touchin_obj_t *self) {
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return get_raw_reading(self);
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}
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uint16_t common_hal_touchio_touchin_get_threshold(touchio_touchin_obj_t *self) {
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return self->threshold;
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}
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void common_hal_touchio_touchin_set_threshold(touchio_touchin_obj_t *self, uint16_t new_threshold) {
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self->threshold = new_threshold;
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}
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#endif // SAMD21
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