hello all:
Recently, I spend some time reading codes about cc2420 and meet some
questions to ask you.
some codes in file CC2420ControlM.nc:
async command result_t CC2420Control.OscillatorOn() {
uint16_t i;
uint8_t status;
i = 0;
// uncomment to measure the startup time from
// high to low to high transitions
// output "1" on the CCA pin
#ifdef CC2420_MEASURE_OSCILLATOR_STARTUP
call HPLChipcon.write(CC2420_IOCFG1, 31);
// output oscillator stable on CCA pin
// error in CC2420 datasheet 1.2: SFDMUX and CCAMUX incorrectly
labelled
TOSH_uwait(50);
#endif
call HPLChipcon.write(CC2420_IOCFG1, 24);
// have an event/interrupt triggered when it starts up
call CCA.startWait(TRUE);
// start the oscillator
status = call HPLChipcon.cmd(CC2420_SXOSCON); //turn-on crystal
return SUCCESS;
}
I want to kown : if we want to turn on crystal, one code "call
HPLChipcon.cmd(CC2420_SXOSCON)" is enough. why we use " call
HPLChipcon.write(CC2420_IOCFG1, 31) call HPLChipcon.write(CC2420_IOCFG1,
24) call CCA.startWait(TRUE)" before it? what are the functions of
them? can you explain them detailedly?? thank you very much!!!
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