void radio_txNow() { PORT_TIMER_WIDTH count; // change state radio_vars.state = RADIOSTATE_TRANSMITTING; //enable radio interrupts enable_radio_interrupts(); //make sure we are not transmitting already while(HWREG(RFCORE_XREG_FSMSTAT1) & RFCORE_XREG_FSMSTAT1_TX_ACTIVE); // send packet by STON strobe see pag 669 CC2538_RF_CSP_ISTXON(); //wait 192uS count=0; while(!((HWREG(RFCORE_XREG_FSMSTAT1) & RFCORE_XREG_FSMSTAT1_TX_ACTIVE))){ count++; //debug } }
/*---------------------------------------------------------------------------*/ static int transmit(unsigned short transmit_len) { uint8_t counter; int ret = RADIO_TX_ERR; rtimer_clock_t t0; uint8_t was_off = 0; PRINTF("RF: Transmit\n"); if(!(rf_flags & RX_ACTIVE)) { t0 = RTIMER_NOW(); on(); was_off = 1; while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + ONOFF_TIME)); } if(channel_clear() == CC2538_RF_CCA_BUSY) { RIMESTATS_ADD(contentiondrop); return RADIO_TX_COLLISION; } /* * prepare() double checked that TX_ACTIVE is low. If SFD is high we are * receiving. Abort transmission and bail out with RADIO_TX_COLLISION */ if(REG(RFCORE_XREG_FSMSTAT1) & RFCORE_XREG_FSMSTAT1_SFD) { RIMESTATS_ADD(contentiondrop); return RADIO_TX_COLLISION; } /* Start the transmission */ ENERGEST_OFF(ENERGEST_TYPE_LISTEN); ENERGEST_ON(ENERGEST_TYPE_TRANSMIT); CC2538_RF_CSP_ISTXON(); counter = 0; while(!((REG(RFCORE_XREG_FSMSTAT1) & RFCORE_XREG_FSMSTAT1_TX_ACTIVE)) && (counter++ < 3)) { clock_delay_usec(6); } if(!(REG(RFCORE_XREG_FSMSTAT1) & RFCORE_XREG_FSMSTAT1_TX_ACTIVE)) { PRINTF("RF: TX never active.\n"); CC2538_RF_CSP_ISFLUSHTX(); ret = RADIO_TX_ERR; } else { /* Wait for the transmission to finish */ while(REG(RFCORE_XREG_FSMSTAT1) & RFCORE_XREG_FSMSTAT1_TX_ACTIVE); ret = RADIO_TX_OK; } ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT); ENERGEST_ON(ENERGEST_TYPE_LISTEN); if(was_off) { off(); } RIMESTATS_ADD(lltx); return ret; }