Difference between revisions of "MansOS Alarm"
(izeditēju laukā alarmu dokumentaciju, kas neatbilst esošajam kodam) |
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{{MansOS_ref_navbar|Alarm}} |
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NOTE: This feature is not implemented as described currently. Older interface version exists. |
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---- |
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Alarms are used to execute some code after a certain time period, possibly repeatedly. |
Alarms are used to execute some code after a certain time period, possibly repeatedly. |
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Note, that the number of timers is limited. |
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Initially there are ALARM_COUNT timers available. |
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The more timers you run, the less precise they may be due to the possibility for several of them to fire at the same time. Only one callback function will be executed immediately, the rest of them will wait for the previous callback to finish and thus will be delayed. |
The more timers you run, the less precise they may be due to the possibility for several of them to fire at the same time. Only one callback function will be executed immediately, the rest of them will wait for the previous callback to finish and thus will be delayed. |
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== Data types == |
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---- |
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'''AlarmId_t''' |
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{{MansOS_ref_navbar|Alarm}} |
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Handle (ID) for identifying the alarm when calling the alarm procedures. |
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'''AlarmCb_t''' |
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Alarm callback function pointer. Points to a function that will be called when the alarm event occurs. |
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'''AlarmType_t''' |
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Alarm types. These may be combined by "or"-ing or adding. |
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== Constants == |
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typedef enum { |
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ALARM_ONESHOOT = 0x01, // Fires the alarm once |
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ALARM_REPEAT = 0x02, // Fires the alarm repeatedly until stopped |
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ALARM_START = 0x04, // Starts the timer now. |
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} '''AlarmType_t'''; |
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const '''AlarmId_t''' ALARM_FAIL = -1; // Alarm operation failed |
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== Functions == |
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AlarmId_t '''alarmNew'''( AlarmCb_t callbackFunction ); |
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Create a new alarm. Returns the ID for the new alarm. Returns ALARM_FAIL when no alarms are available. |
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Set the callback function. |
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void '''alarmSet'''( AlarmId_t id, AlarmType_t type, uint delayInMs ) |
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Set the alarm type and time period in milliseconds. |
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Do not start the alarm unless ALARM_START is added to the type. |
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Stop the alarm if it is already running. |
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void '''alarmStart'''( AlarmId_t id ); |
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Start the alarm. Resets the alarm if it was already running. |
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void '''alarmStop'''( AlarmId_t id ); |
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Stop the alarm. You may start this alarm later again. |
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void '''alarmFree'''( AlarmId_t id ); |
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Stops and releases the alarm with this ID. |
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== Advanced Functions == |
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int alarmUnused(); |
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Returns the number of unused (free) alarms. |
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This number is limited, especially on the platforms with very limited memory. |
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Initially there are ALARM_COUNT alarms available. |
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== Example == |
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#include "alarm.h" |
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bool myStartAlarm() |
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{ |
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AlarmId_t id = alarmNew( myAlarm ); |
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if( id == ALARM_FAIL ) return false; |
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alarmSet( id, ALARM_REPEAT+ALARM_START, 1000); // Starts the timer now and fires every second |
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return true; |
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} |
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AlarmCb_t myAlarm() |
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{ |
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LedsToggleRed(); // Blink the red LED |
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} |
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Latest revision as of 14:49, 28 September 2011
| MansOS | --> | Reference | --> | Alarm | :: | #Basic | :: | #Advanced | :: | #Example |
Alarms are used to execute some code after a certain time period, possibly repeatedly.
The more timers you run, the less precise they may be due to the possibility for several of them to fire at the same time. Only one callback function will be executed immediately, the rest of them will wait for the previous callback to finish and thus will be delayed.
Declared in:
#include "alarm.h"
| MansOS | --> | Reference | --> | Alarm | :: | #Basic | :: | #Advanced | :: | #Example |
