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cortex-m: Add task_wait_event_mask() helper function

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BUG=chrome-os-partner:27180
BRANCH=rambi
TEST=Tested indirectly via subsequent patches to use
this call in the adc and i2c handlers for the lm4.

Change-Id: I53501fdf47d606ea6c7705facb66e945e25d9745
Signed-off-by: Dave Parker <dparker@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/191300
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
ChromeOS Developer
2014-03-22 13:56:42 -07:00
committed by chrome-internal-fetch
parent 7895c27803
commit d9bd95200f
2 changed files with 49 additions and 1 deletions
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29
core/cortex-m/task.c
View File

@@ -380,6 +380,35 @@ uint32_t task_wait_event(int timeout_us)
return __wait_evt(timeout_us, TASK_ID_IDLE);
}
uint32_t task_wait_event_mask(uint32_t event_mask, int timeout_us)
{
uint64_t deadline = get_time().val + timeout_us;
uint32_t events = 0;
int time_remaining_us = timeout_us;
/* Add the timer event to the mask so we can indicate a timeout */
event_mask |= TASK_EVENT_TIMER;
while (!(events & event_mask)) {
/* Collect events to re-post later */
events |= __wait_evt(time_remaining_us, TASK_ID_IDLE);
time_remaining_us = deadline - get_time().val;
if (timeout_us > 0 && time_remaining_us <= 0) {
/* Ensure we return a TIMER event if we timeout */
events |= TASK_EVENT_TIMER;
break;
}
}
/* Re-post any other events collected */
if (events & ~event_mask)
atomic_or(task_get_event_bitmap(task_get_current()),
events & ~event_mask);
return events & event_mask;
}
void task_enable_irq(int irq)
{
CPU_NVIC_EN(irq / 32) = 1 << (irq % 32);

21
include/task.h
View File

@@ -95,9 +95,28 @@ uint32_t *task_get_event_bitmap(task_id_t tskid);
* @param timeout_us If > 0, sets a timer to produce the TASK_EVENT_TIMER
* event after the specified micro-second duration.
*
* @return The bitmap of received events. */
* @return The bitmap of received events.
*/
uint32_t task_wait_event(int timeout_us);
/**
* Wait for any event included in an event mask.
*
* If one or more events are already pending, returns immediately. Otherwise,
* it de-schedules the calling task and wakes up the next one in the priority
* order. Automatically clears the bitmap of received events before returning
* the events which are set.
*
* @param event_mask Bitmap of task events to wait for.
*
* @param timeout_us If > 0, sets a timer to produce the TASK_EVENT_TIMER
* event after the specified micro-second duration.
*
* @return The bitmap of received events. Includes
* TASK_EVENT_TIMER if the timeout is reached.
*/
uint32_t task_wait_event_mask(uint32_t event_mask, int timeout_us);
/**
* Prints the list of tasks.
*