circuitpython/ports/atmel-samd/common-hal/touchio/TouchIn.c

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