117 lines
4.5 KiB
C
117 lines
4.5 KiB
C
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/*
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(C) 2015-2016 flabbergast <s3+flabbergast@sdfeu.org>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "hal.h"
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#define PWM_DRIVER PWMD1
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static void pwmpcb(PWMDriver *pwmp) {
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(void)pwmp;
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palSetLine(LINE_LED);
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}
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static void pwmc0cb(PWMDriver *pwmp) {
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(void)pwmp;
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palClearLine(LINE_LED);
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}
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static PWMConfig pwmcfg = {
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24000000, /* 24MHz PWM clock frequency. */
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12000, /* Initial PWM period 1ms */
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pwmpcb,
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{
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{PWM_OUTPUT_DISABLED, pwmc0cb},
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{PWM_OUTPUT_DISABLED, NULL},
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},
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};
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/* Breathing Sleep LED brighness(PWM On period) table
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*
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* http://www.wolframalpha.com/input/?i=%28sin%28+x%2F64*pi%29**8+*+255%2C+x%3D0+to+63
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* (0..63).each {|x| p ((sin(x/64.0*PI)**8)*255).to_i }
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*/
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/* ruby -e "a = ((0..255).map{|x| Math.exp(Math.cos(Math::PI+(2*x*(Math::PI)/255)))-Math.exp(-1) }); m = a.max; a.map\!{|x| (9900*x/m).to_i+1}; p a" */
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#define BREATHE_STEP 16 /* ms; = 4000ms/TABLE_SIZE */
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#define TABLE_SIZE 256
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static const uint16_t breathing_table[TABLE_SIZE] = {
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1, 1, 2, 5, 8, 12, 17, 24, 31, 39, 48, 58, 69, 81, 95, 109, 124, 140, 158, 177, 196, 217, 239, 263, 287, 313, 340, 369, 399, 430, 463, 497, 532, 570, 608, 649, 691, 734, 779, 827, 875, 926, 979, 1033, 1090, 1148, 1209, 1271, 1336, 1403, 1472, 1543, 1617, 1693, 1771, 1852, 1935, 2021, 2109, 2199, 2292, 2387, 2486, 2586, 2689, 2795, 2903, 3014, 3127, 3243, 3362, 3482, 3606, 3731, 3859, 3989, 4122, 4256, 4392, 4531, 4671, 4813, 4957, 5102, 5248, 5396, 5545, 5694, 5845, 5995, 6147, 6298, 6449, 6600, 6751, 6901, 7050, 7198, 7344, 7489, 7632, 7772, 7911, 8046, 8179, 8309, 8435, 8557, 8676, 8790, 8900, 9005, 9105, 9201, 9291, 9375, 9454, 9527, 9593, 9654, 9708, 9756, 9797, 9831, 9859, 9880, 9894, 9900, 9901, 9894, 9880, 9859, 9831, 9797, 9756, 9708, 9654, 9593, 9527, 9454, 9375, 9291, 9201, 9105, 9005, 8900, 8790, 8676, 8557, 8435, 8309, 8179, 8046, 7911, 7772, 7632, 7489, 7344, 7198, 7050, 6901, 6751, 6600, 6449, 6298, 6147, 5995, 5845, 5694, 5545, 5396, 5248, 5102, 4957, 4813, 4671, 4531, 4392, 4256, 4122, 3989, 3859, 3731, 3606, 3482, 3362, 3243, 3127, 3014, 2903, 2795, 2689, 2586, 2486, 2387, 2292, 2199, 2109, 2021, 1935, 1852, 1771, 1693, 1617, 1543, 1472, 1403, 1336, 1271, 1209, 1148, 1090, 1033, 979, 926, 875, 827, 779, 734, 691, 649, 608, 570, 532, 497, 463, 430, 399, 369, 340, 313, 287, 263, 239, 217, 196, 177, 158, 140, 124, 109, 95, 81, 69, 58, 48, 39, 31, 24, 17, 12, 8, 5, 2, 1, 1
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};
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uint16_t table_pos = 0;
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static THD_WORKING_AREA(waBreatheThread, 128);
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static THD_FUNCTION(BreatheThread, arg) {
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(void)arg;
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chRegSetThreadName("breatheThread");
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while(!chThdShouldTerminateX()) {
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pwmEnableChannel(&PWM_DRIVER, 0, PWM_PERCENTAGE_TO_WIDTH(&PWM_DRIVER,breathing_table[table_pos]));
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table_pos = (table_pos+1) % TABLE_SIZE;
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chThdSleepMilliseconds(BREATHE_STEP);
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}
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}
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/*
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* Application entry point.
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*/
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int main(void) {
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/*
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* System initializations.
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* - HAL initialization, this also initializes the configured device drivers
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* and performs the board-specific initializations.
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* - Kernel initialization, the main() function becomes a thread and the
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* RTOS is active.
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*/
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halInit();
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chSysInit();
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/*
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* Initialize the PWM driver.
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*/
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pwmStart(&PWM_DRIVER, &pwmcfg);
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pwmEnablePeriodicNotification(&PWM_DRIVER);
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/*
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* Starts the PWM channel 0; turn the LED off.
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*/
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pwmEnableChannel(&PWM_DRIVER, 0, PWM_PERCENTAGE_TO_WIDTH(&PWM_DRIVER, 0));
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pwmEnableChannelNotification(&PWM_DRIVER, 0); // MUST be before EnableChannel...
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/*
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* Create the breathe thread.
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*/
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thread_t *breathe_thread_p;
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breathe_thread_p = chThdCreateStatic(waBreatheThread, sizeof(waBreatheThread), NORMALPRIO, BreatheThread, NULL);
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/*
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* Normal main() thread activity, in this demo it does nothing.
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*/
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while (!chThdShouldTerminateX()) {
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chThdSleepMilliseconds(500);
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}
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chThdTerminate(breathe_thread_p);
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chThdSleepMilliseconds(2*BREATHE_STEP);
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/*
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* Disables channel 0 and stops the drivers.
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*/
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pwmDisableChannel(&PWM_DRIVER, 0);
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pwmStop(&PWM_DRIVER);
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return 0;
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}
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