circuitpython/shared-module/_pew/PewPew.c

126 lines
4.0 KiB
C

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