hal_rf_wait_for_crystal_oscillator.c

来自「zigbee中心节点源代码」· C语言 代码 · 共 25 行

#include "include.h"

//-------------------------------------------------------------------------------------------------------
//	void rfWaitForCrystalOscillator(void)
//
//	DESCRIPTION:
//		Waits for the crystal oscillator to become stable. The flag is polled via the SPI status byte.
//      
//      Note that this function will lock up if the SXOSCON command strobe has not been given before the
//      function call. Also note that global interrupts will always be enabled when this function 
//      returns.
//-------------------------------------------------------------------------------------------------------
void halRfWaitForCrystalOscillator(void) {
    BYTE spiStatusByte;

    // Poll the SPI status byte until the crystal oscillator is stable
    do {
	    DISABLE_GLOBAL_INT();
	    FASTSPI_UPD_STATUS(spiStatusByte);
	    ENABLE_GLOBAL_INT();
    } while (!(spiStatusByte & (BM(CC2420_XOSC16M_STABLE))));//?
} // halRfWaitForCrystalOscillator