130 lines
4.0 KiB
C
130 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) 2018 Dan Halbert 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 "common-hal/pulseio/PulseOut.h"
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#include "peripherals/nrf/timers.h"
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#include <stdint.h>
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#include "nrfx.h"
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#include "nrfx_timer.h"
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#include "py/mpconfig.h"
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#include "py/runtime.h"
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STATIC nrfx_timer_t nrfx_timers[] = {
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#if NRFX_CHECK(NRFX_TIMER0_ENABLED)
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#error NRFX_TIMER0_ENABLED should not be on: TIMER0 is used by the SoftDevice
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NRFX_TIMER_INSTANCE(0),
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#endif
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#if NRFX_CHECK(NRFX_TIMER1_ENABLED)
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NRFX_TIMER_INSTANCE(1),
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#endif
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#if NRFX_CHECK(NRFX_TIMER2_ENABLED)
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NRFX_TIMER_INSTANCE(2),
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#endif
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#if NRFX_CHECK(NRFX_TIMER3_ENABLED)
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NRFX_TIMER_INSTANCE(3),
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#endif
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#if NRFX_CHECK(NRFX_TIMER4_ENABLED)
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NRFX_TIMER_INSTANCE(4),
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#endif
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};
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static bool nrfx_timer_allocated[ARRAY_SIZE(nrfx_timers)];
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static bool nrfx_timer_never_reset[ARRAY_SIZE(nrfx_timers)];
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void timers_reset(void) {
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for (size_t i = 0; i < ARRAY_SIZE(nrfx_timers); i ++) {
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if (nrfx_timer_never_reset[i]) {
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continue;
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}
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nrfx_timer_uninit(&nrfx_timers[i]);
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nrfx_timer_allocated[i] = false;
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}
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}
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void nrf_peripherals_timer_never_reset(nrfx_timer_t* timer) {
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int idx = nrf_peripherals_timer_idx_from_timer(timer);
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nrfx_timer_never_reset[idx] = true;
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}
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void nrf_peripherals_timer_reset_ok(nrfx_timer_t* timer) {
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int idx = nrf_peripherals_timer_idx_from_timer(timer);
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nrfx_timer_never_reset[idx] = false;
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}
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nrfx_timer_t* nrf_peripherals_timer_from_reg(NRF_TIMER_Type* ptr) {
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for (size_t i = 0; i < ARRAY_SIZE(nrfx_timers); i ++) {
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if (nrfx_timers[i].p_reg == ptr) {
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return &nrfx_timers[i];
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}
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}
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return NULL;
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}
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size_t nrf_peripherals_timer_idx_from_timer(nrfx_timer_t* ptr) {
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for (size_t i = 0; i < ARRAY_SIZE(nrfx_timers); i ++) {
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if (&nrfx_timers[i] == ptr) {
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return i;
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}
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}
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return ~(size_t)0;
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}
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// Returns a free nrfx_timer instance, and marks it as allocated.
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// The caller should init as with the desired config.
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// Returns NULL if no timer is available.
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nrfx_timer_t* nrf_peripherals_allocate_timer(void) {
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for (size_t i = 0; i < ARRAY_SIZE(nrfx_timers); i ++) {
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if (!nrfx_timer_allocated[i]) {
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nrfx_timer_allocated[i] = true;
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return &nrfx_timers[i];
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}
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}
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return NULL;
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}
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nrfx_timer_t* nrf_peripherals_allocate_timer_or_throw(void) {
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nrfx_timer_t* result = nrf_peripherals_allocate_timer();
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if (!result) {
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mp_raise_RuntimeError(translate("All timers in use"));
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}
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return result;
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}
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// Free a timer, which may or may not have been initialized.
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void nrf_peripherals_free_timer(nrfx_timer_t* timer) {
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size_t idx = nrf_peripherals_timer_idx_from_timer(timer);
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if (idx != ~(size_t)0) {
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nrfx_timer_allocated[idx] = false;
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nrfx_timer_never_reset[idx] = false;
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// Safe to call even if not initialized.
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nrfx_timer_uninit(timer);
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}
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}
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