/***********************************************************************************
* @fn halRfTransmit
*
* @brief Transmit frame with Clear Channel Assessment.
*
* @param none
*
* @return uint8 - HAL_RF_SUCCESS or HAL_RF_FAILED
*/
uint8 halRfTransmit(void)
{
uint16 timeout = 2500; // 2500 x 20us = 50ms
uint8 status=0;
// DEBUG_MSG_FUNC_START;
// Wait for RSSI to become valid
while(!CC2520_RSSI_VALID_PIN);
// Reuse GPIO2 for TX_FRM_DONE exception
HAL_INT_OFF();
CC2520_CFG_GPIO_OUT(2, 1 + CC2520_EXC_TX_FRM_DONE);
HAL_INT_ON();
// Wait for the transmission to begin before exiting (makes sure that this function cannot be called
// a second time, and thereby cancelling the first transmission.
while(--timeout > 0) {
HAL_INT_OFF();
CC2520_INS_STROBE(CC2520_INS_STXONCCA);
HAL_INT_ON();
if (CC2520_SAMPLED_CCA_PIN) break;
#if 0 // POOH
halMcuWaitUs(20);
#else
Delay(20);
#endif
}
if (timeout == 0) {
DEBUG_MSG_FUNC_ERROR;
status = HAL_RF_FAILED;
CC2520_INS_STROBE(CC2520_INS_SFLUSHTX);
}
else {
status = HAL_RF_SUCCESS;
// Wait for TX_FRM_DONE exception
while(!CC2520_TX_FRM_DONE_PIN);
HAL_INT_OFF();
CC2520_CLEAR_EXC(CC2520_EXC_TX_FRM_DONE);
HAL_INT_ON();
}
// Reconfigure GPIO2
HAL_INT_OFF();
CC2520_CFG_GPIO_OUT(2, CC2520_GPIO_RSSI_VALID);
HAL_INT_ON();
return status;
}
/***********************************************************************************
* @fn halRfWaitTransceiverReady
*
* @brief Wait until the transceiver is ready (SFD low).
*
* @param none
*
* @return none
*/
void halRfWaitTransceiverReady(void)
{
#ifdef INCLUDE_PA
// GPIO3 is not conncted to combo board; use SFD at GPIO2 instead
HAL_INT_OFF();
// GPIO2 = SFD
CC2520_CFG_GPIO_OUT(2,CC2520_GPIO_SFD);
while (CC2520_GPIO2_IPIN);
// GPIO2 = default (RSSI_VALID)
CC2520_CFG_GPIO_OUT(2,CC2520_GPIO_RSSI_VALID);
HAL_INT_ON();
#else
while (CC2520_GPIO3_IPIN);
#endif
}
/***********************************************************************************
* @fn halIntOff
*
* @brief Turns global interrupts off.
*
* @param none
*
* @return none
*/
void halIntOff(void) {
HAL_INT_OFF();
}
