commandsounderm.nc

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

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/* 
 * Authors:  Wei Hong
 *           Intel Research Berkeley Lab
 * Date:     7/15/2002
 *
 */

// register command for turning sounder on for a peroid of time
// SetSound(uint16_t n): turn sounder on for n milliseconds
module CommandSounderM
{
	provides interface StdControl;
	uses
	{
		interface CommandRegister as SetSound;
		interface StdControl as SounderControl;
		interface Timer as Clock1;
		interface StdControl as TimerControl;
	}
}
implementation
{
	bool commandPending;
	command result_t StdControl.init()
	{
		ParamList paramList;
		call SounderControl.init();
		call TimerControl.init();
		setParamList(&paramList, 1, INT16);
		if (call SetSound.registerCommand("SetSnd", VOID, 0, &paramList) != SUCCESS)
			return FAIL;
		commandPending = FALSE;
		return SUCCESS;
	}

	command result_t StdControl.start()
	{
		return SUCCESS;
	}

	command result_t StdControl.stop()
        {
		return SUCCESS;
	}

	event result_t SetSound.commandFunc(char *commandName, char *resultBuf, SchemaErrorNo *errorNo, ParamVals *params)
	{
		int16_t arg = *(uint16_t*)(params->paramDataPtr[0]);
		if (commandPending)
			return FAIL;
		commandPending = TRUE;
		call Clock1.start(TIMER_ONE_SHOT, arg);
		return call SounderControl.start();
	}

	event result_t Clock1.fired()
	{
	  result_t ret = call SounderControl.stop();
		commandPending = FALSE;
		return ret;
	}
}