146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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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 "ch.h"
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#include "hal.h"
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static void pwmpcb(PWMDriver *pwmp) {
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(void)pwmp;
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palClearPad(GPIOC, GPIOC_LED4);
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}
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static void pwmc1cb(PWMDriver *pwmp) {
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(void)pwmp;
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palSetPad(GPIOC, GPIOC_LED4);
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}
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static PWMConfig pwmcfg = {
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10000, /* 10kHz PWM clock frequency. */
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10000, /* Initial PWM period 1S. */
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pwmpcb,
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{
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{PWM_OUTPUT_ACTIVE_HIGH, pwmc1cb},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL}
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},
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0,
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0
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};
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icucnt_t last_width, last_period;
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static void icuwidthcb(ICUDriver *icup) {
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palSetPad(GPIOC, GPIOC_LED3);
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last_width = icuGetWidth(icup);
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}
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static void icuperiodcb(ICUDriver *icup) {
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palClearPad(GPIOC, GPIOC_LED3);
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last_period = icuGetPeriod(icup);
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}
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static void icuoverflowcb(ICUDriver *icup) {
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(void)icup;
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}
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static ICUConfig icucfg = {
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ICU_INPUT_ACTIVE_HIGH,
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10000, /* 10kHz ICU clock frequency. */
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icuwidthcb,
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icuperiodcb,
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icuoverflowcb,
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ICU_CHANNEL_1,
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0
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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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* Initializes the PWM driver 2 and ICU driver 3.
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* GPIOA6 is the ICU input (CH1).
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* GPIOA15 is the PWM output (CH1).
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* The two pins have to be externally connected together.
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*/
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pwmStart(&PWMD2, &pwmcfg);
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palSetPadMode(GPIOA, 15, PAL_MODE_ALTERNATE(2));
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icuStart(&ICUD3, &icucfg);
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palSetPadMode(GPIOA, 6, PAL_MODE_ALTERNATE(1));
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icuEnable(&ICUD3);
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chThdSleepMilliseconds(2000);
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/*
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* Starts the PWM channel 0 using 75% duty cycle.
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*/
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pwmEnableChannel(&PWMD2, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD2, 7500));
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chThdSleepMilliseconds(5000);
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/*
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* Changes the PWM channel 0 to 50% duty cycle.
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*/
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pwmEnableChannel(&PWMD2, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD2, 5000));
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chThdSleepMilliseconds(5000);
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/*
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* Changes the PWM channel 0 to 25% duty cycle.
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*/
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pwmEnableChannel(&PWMD2, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD2, 2500));
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chThdSleepMilliseconds(5000);
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/*
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* Changes PWM period to half second the duty cycle becomes 50%
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* implicitly.
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*/
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pwmChangePeriod(&PWMD2, 5000);
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chThdSleepMilliseconds(5000);
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/*
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* Disables channel 0 and stops the drivers.
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*/
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pwmDisableChannel(&PWMD2, 0);
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pwmStop(&PWMD2);
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icuDisable(&ICUD3);
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icuStop(&ICUD3);
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palClearPad(GPIOC, GPIOC_LED3);
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palClearPad(GPIOC, GPIOC_LED4);
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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 (TRUE) {
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chThdSleepMilliseconds(500);
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}
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return 0;
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}
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