This is an example of the new PAL driver, note, the same application is implemented using callbacks or the new synchronous API, the new API looks much simpler.
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/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "ch.h"
#include "hal.h"
#include "portab.h"
/*===========================================================================*/
/* Generic code. */
/*===========================================================================*/
#if defined(PORTAB_LINE_LED2)
/*
* LED blinker thread, times are in milliseconds.
*/
static THD_WORKING_AREA(waThread1, 128);
static THD_FUNCTION(Thread1, arg) {
(void)arg;
chRegSetThreadName("blinker");
while (true) {
systime_t time = palReadLine(PORTAB_LINE_BUTTON) == PORTAB_BUTTON_PRESSED ? 250 : 500;
palToggleLine(PORTAB_LINE_LED2);
chThdSleepMilliseconds(time);
}
}
#endif
#if PAL_USE_WAIT || defined(__DOXYGEN__)
/*
* Application entry point.
*/
int main(void) {
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
chSysInit();
#if defined(PORTAB_LINE_LED2)
/*
* Creates the blinker thread.
*/
chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
#endif
/* Enabling events on both edges of the button line.*/
palEnableLineEvent(PORTAB_LINE_BUTTON, PAL_EVENT_MODE_BOTH_EDGES);
/*
* Normal main() thread activity.
*/
while (true) {
/* Waiting for an edge on the button.*/
palWaitLineTimeout(PORTAB_LINE_BUTTON, TIME_INFINITE);
/* Action depending on button state.*/
if (palReadLine(PORTAB_LINE_BUTTON) == PORTAB_BUTTON_PRESSED) {
palWriteLine(PORTAB_LINE_LED1, PORTAB_LEN_ON);
}
else {
palWriteLine(PORTAB_LINE_LED1, PORTAB_LEN_OFF);
}
}
}
#endif /* PAL_USE_WAIT */
#if !PAL_USE_WAIT && PAL_USE_CALLBACKS
static event_source_t button_pressed_event;
static event_source_t button_released_event;
static void button_cb(void *arg) {
(void)arg;
chSysLockFromISR();
if (palReadLine(PORTAB_LINE_BUTTON) == PORTAB_BUTTON_PRESSED) {
chEvtBroadcastI(&button_pressed_event);
}
else {
chEvtBroadcastI(&button_released_event);
}
chSysUnlockFromISR();
}
/*
* Application entry point.
*/
int main(void) {
event_listener_t el0, el1;
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
chSysInit();
/* Events initialization and registration.*/
chEvtObjectInit(&button_pressed_event);
chEvtObjectInit(&button_released_event);
chEvtRegister(&button_pressed_event, &el0, 0);
chEvtRegister(&button_released_event, &el1, 1);
#if defined(PORTAB_LINE_LED2)
/*
* Creates the blinker thread.
*/
chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
#endif
/* Enabling events on both edges of the button line.*/
palEnableLineEvent(PORTAB_LINE_BUTTON, PAL_EVENT_MODE_BOTH_EDGES);
palSetLineCallback(PORTAB_LINE_BUTTON, button_cb, NULL);
/*
* Normal main() thread activity.
*/
while (true) {
eventmask_t events;
events = chEvtWaitOne(EVENT_MASK(0) | EVENT_MASK(1));
if (events & EVENT_MASK(0)) {
palWriteLine(PORTAB_LINE_LED1, PORTAB_LEN_ON);
}
if (events & EVENT_MASK(1)) {
palWriteLine(PORTAB_LINE_LED1, PORTAB_LEN_OFF);
}
}
}
#endif /* !PAL_USE_WAIT && PAL_USE_CALLBACKS */
#if !PAL_USE_WAIT && !PAL_USE_CALLBACKS
/*
* Application entry point.
*/
int main(void) {
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
chSysInit();
#if defined(PORTAB_LINE_LED2)
/*
* Creates the blinker thread.
*/
chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
#endif
/*
* Normal main() thread activity.
*/
while (true) {
palToggleLine(PORTAB_LINE_LED1);
chThdSleepMilliseconds(500);
}
}
#endif /* !PAL_USE_WAIT && !PAL_USE_CALLBACKS */
The test application is available under /testhal/STM32/multi/PAL
Giovanni
