PROCESS_THREAD(interferer_example, ev, data)
{
PROCESS_EXITHANDLER()
PROCESS_BEGIN();
static struct etimer et;
//powertrace_start(CLOCK_SECOND * 2);
// Initial configurations on CC2420: channel and tx power
watchdog_stop();
cc2420_set_txpower(power);
cc2420_set_channel(26);
//printf("interfering with periodic interference\n");
// Continuous Interference
CC2420_SPI_ENABLE();
//SPI_SET_UNMODULATED(0x1800,0x0100,0x0508,0x0004);
SPI_SET_MODULATED(0x050C);
//powertrace_start(CLOCK_SECOND*2);
while(1){
for(power=3; power<32; power+=4){
SPI_SET_TXPOWER((0xa0ff & 0xffe0) | (power & 0x1f));
etimer_set(&et, CLOCK_SECOND/1000);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
//printf ("transmit power = %d\n",power);
}
for(power=27; power>3; power-=4){
SPI_SET_TXPOWER((0xa0ff & 0xffe0) | (power & 0x1f));
etimer_set(&et, CLOCK_SECOND/1000);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
//printf ("transmit power = %d\n",power);
}
for(power=3; power<32; power+=2){
SPI_SET_TXPOWER((0xa0ff & 0xffe0) | (0 & 0x1f));
etimer_set(&et, CLOCK_SECOND/1000);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
//printf ("transmit power = %d\n",power);
}
}
CC2420_SPI_DISABLE();
void powertrace_stop(void);
PROCESS_WAIT_EVENT();
PROCESS_END();
}
// Starts the interferer (0 = unmodulated carrier, !0 = modulated carrier)
void set_jammer(int carrier){
if(carrier){
/*
* The CC2420 has a built-in test pattern generator that can generate pseudo random sequence using the CRC generator.
* This is enabled by setting MDMCTRL1.TX_MODE to 3 and issue a STXON command strobe. The modulated spectrum is then available on the RF pins.
* The low byte of the CRC word is transmitted and the CRC is updated with 0xFF for each new byte.
* The length of the transmitted data sequence is 65535 bits. The transmitted data-sequence is then: [synch header] [0x00, 0x78, 0xb8, 0x4b, 0x99, 0xc3, 0xe9, …]
*/
SPI_SET_MODULATED(0x050C);
}
else{
/*
* An unmodulated carrier may be transmitted by setting MDMCTRL1.TX_MODE to 2, writing 0x1800 to the DACTST register and issue a STXON command strobe.
* The transmitter is then enabled while the transmitter I/Q DACs are overridden to static values.
* An unmodulated carrier will then be available on the RF output pins.
*/
SPI_SET_UNMODULATED(0x1800,0x0100,0x0508,0x0004);
}
}
static void modulated() // Sends a modulated carrier
{
SPI_SET_MODULATED(0x050C);
}