146 lines
3.7 KiB
C++
146 lines
3.7 KiB
C++
/* Teensyduino Core Library
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* http://www.pjrc.com/teensy/
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* Copyright (c) 2017 PJRC.COM, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* 1. The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* 2. If the Software is incorporated into a build system that allows
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* selection among a list of target devices, then similar target
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* devices manufactured by PJRC.COM must be included in the list of
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* target devices and selectable in the same manner.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "IntervalTimer.h"
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static void dummy_funct(void);
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#if defined(KINETISK)
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#define NUM_CHANNELS 4
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static void (*funct_table[4])(void) = {dummy_funct, dummy_funct, dummy_funct, dummy_funct};
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#elif defined(KINETISL)
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#define NUM_CHANNELS 2
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static void (*funct_table[2])(void) = {dummy_funct, dummy_funct};
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uint8_t IntervalTimer::nvic_priorites[2] = {255, 255};
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#endif
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bool IntervalTimer::beginCycles(void (*funct)(), uint32_t cycles)
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{
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if (channel) {
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channel->TCTRL = 0;
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channel->TFLG = 1;
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} else {
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SIM_SCGC6 |= SIM_SCGC6_PIT;
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__asm__ volatile("nop"); // solves timing problem on Teensy 3.5
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PIT_MCR = 1;
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channel = KINETISK_PIT_CHANNELS;
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while (1) {
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if (channel->TCTRL == 0) break;
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if (++channel >= KINETISK_PIT_CHANNELS + NUM_CHANNELS) {
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channel = NULL;
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return false;
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}
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}
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}
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int index = channel - KINETISK_PIT_CHANNELS;
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funct_table[index] = funct;
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channel->LDVAL = cycles;
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channel->TCTRL = 3;
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#if defined(KINETISK)
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NVIC_SET_PRIORITY(IRQ_PIT_CH0 + index, nvic_priority);
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NVIC_ENABLE_IRQ(IRQ_PIT_CH0 + index);
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#elif defined(KINETISL)
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nvic_priorites[index] = nvic_priority;
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if (nvic_priorites[0] <= nvic_priorites[1]) {
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NVIC_SET_PRIORITY(IRQ_PIT, nvic_priorites[0]);
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} else {
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NVIC_SET_PRIORITY(IRQ_PIT, nvic_priorites[1]);
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}
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NVIC_ENABLE_IRQ(IRQ_PIT);
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#endif
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return true;
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}
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void IntervalTimer::end() {
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if (channel) {
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int index = channel - KINETISK_PIT_CHANNELS;
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#if defined(KINETISK)
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NVIC_DISABLE_IRQ(IRQ_PIT_CH0 + index);
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#elif defined(KINETISL)
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// TODO: disable IRQ_PIT, but only if both instances ended
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#endif
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funct_table[index] = dummy_funct;
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channel->TCTRL = 0;
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#if defined(KINETISL)
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nvic_priorites[index] = 255;
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if (nvic_priorites[0] <= nvic_priorites[1]) {
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NVIC_SET_PRIORITY(IRQ_PIT, nvic_priorites[0]);
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} else {
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NVIC_SET_PRIORITY(IRQ_PIT, nvic_priorites[1]);
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}
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#endif
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channel = 0;
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}
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}
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#if defined(KINETISK)
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void pit0_isr()
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{
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PIT_TFLG0 = 1;
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funct_table[0]();
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}
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void pit1_isr() {
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PIT_TFLG1 = 1;
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funct_table[1]();
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}
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void pit2_isr() {
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PIT_TFLG2 = 1;
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funct_table[2]();
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}
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void pit3_isr() {
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PIT_TFLG3 = 1;
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funct_table[3]();
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}
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#elif defined(KINETISL)
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void pit_isr() {
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if (PIT_TFLG0) {
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PIT_TFLG0 = 1;
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funct_table[0]();
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}
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if (PIT_TFLG1) {
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PIT_TFLG1 = 1;
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funct_table[1]();
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}
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}
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#endif
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static void dummy_funct(void)
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{
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}
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