hal_rf_set_channel.c

来自「zigbee子节点源代码」· C语言 代码 · 共 31 行

#include "include.h"

//-------------------------------------------------------------------------------------------------------
//	void halRfSetChannel(UINT8 Channel)
//
//	DESCRIPTION:
//		Programs CC2420 for a given IEEE 802.15.4 channel. 
//		Note that SRXON, STXON or STXONCCA must be run for the new channel selection to take full effect.
//
//	PARAMETERS:
//		UINT8 channel
//			The channel number (11-26)
//-------------------------------------------------------------------------------------------------------
void halRfSetChannel(UINT8 channel) {
	UINT16 f;
	
	// Derive frequency programming from the given channel number
	f = (UINT16) (channel - 11); // Subtract the base channel 
	f = f + (f << 2);    		 // Multiply with 5, which is the channel spacing
	f = f + 357 + 0x4000;		 // 357 is 2405-2048, 0x4000 is LOCK_THR = 1
	
    // Write it to the CC2420
	DISABLE_GLOBAL_INT();
	FASTSPI_SETREG(CC2420_FSCTRL, f);
	ENABLE_GLOBAL_INT();

} // rfSetChannel