126 lines
4.0 KiB
C
126 lines
4.0 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) 2019 Radomir Dopieralski
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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 <stdbool.h>
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#include "py/mpstate.h"
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#include "py/runtime.h"
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#include "__init__.h"
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#include "PewPew.h"
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#include "shared-bindings/digitalio/Pull.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "shared-bindings/util.h"
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#include "samd/timers.h"
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#include "supervisor/shared/translate.h"
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#include "timer_handler.h"
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static uint8_t pewpew_tc_index = 0xff;
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void pewpew_interrupt_handler(uint8_t index) {
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if (index != pewpew_tc_index) {
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return;
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}
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Tc* tc = tc_insts[index];
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if (!tc->COUNT16.INTFLAG.bit.MC0) {
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return;
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}
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pew_tick();
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// Clear the interrupt bit.
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tc->COUNT16.INTFLAG.reg = TC_INTFLAG_MC0;
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}
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void pew_init() {
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pew_obj_t* pew = MP_STATE_VM(pew_singleton);
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common_hal_digitalio_digitalinout_switch_to_input(pew->buttons, PULL_UP);
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for (size_t i = 0; i < pew->rows_size; ++i) {
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digitalio_digitalinout_obj_t *pin = MP_OBJ_TO_PTR(pew->rows[i]);
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common_hal_digitalio_digitalinout_switch_to_output(pin, false,
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DRIVE_MODE_PUSH_PULL);
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}
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for (size_t i = 0; i < pew->cols_size; ++i) {
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digitalio_digitalinout_obj_t *pin = MP_OBJ_TO_PTR(pew->cols[i]);
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common_hal_digitalio_digitalinout_switch_to_output(pin, true,
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DRIVE_MODE_OPEN_DRAIN);
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}
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if (pewpew_tc_index == 0xff) {
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// Find a spare timer.
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uint8_t index = find_free_timer();
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if (index == 0xff) {
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mp_raise_RuntimeError(translate("All timers in use"));
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}
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Tc *tc = tc_insts[index];
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pewpew_tc_index = index;
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set_timer_handler(true, index, TC_HANDLER_PEW);
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// We use GCLK0 for SAMD21 and GCLK1 for SAMD51 because they both run
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// at 48mhz making our math the same across the boards.
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#ifdef SAMD21
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turn_on_clocks(true, index, 0);
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#endif
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#ifdef SAMD51
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turn_on_clocks(true, index, 1);
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#endif
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#ifdef SAMD21
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tc->COUNT16.CTRLA.reg = TC_CTRLA_MODE_COUNT16 |
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TC_CTRLA_PRESCALER_DIV64 |
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TC_CTRLA_WAVEGEN_MFRQ;
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#endif
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#ifdef SAMD51
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tc_reset(tc);
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tc_set_enable(tc, false);
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tc->COUNT16.CTRLA.reg = TC_CTRLA_MODE_COUNT16
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| TC_CTRLA_PRESCALER_DIV64;
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tc->COUNT16.WAVE.reg = TC_WAVE_WAVEGEN_MFRQ;
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#endif
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tc_set_enable(tc, true);
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tc->COUNT16.CC[0].reg = 64;
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// Clear our interrupt in case it was set earlier
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tc->COUNT16.INTFLAG.reg = TC_INTFLAG_MC0;
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tc->COUNT16.INTENSET.reg = TC_INTENSET_MC0;
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tc_enable_interrupts(pewpew_tc_index);
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}
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}
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void pew_reset(void) {
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if (pewpew_tc_index != 0xff) {
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tc_reset(tc_insts[pewpew_tc_index]);
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pewpew_tc_index = 0xff;
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}
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MP_STATE_VM(pew_singleton) = NULL;
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}
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