/***********************************************************************************
* @fn halRfTransmit
*
* @brief Transmit frame with Clear Channel Assessment.
*
* @param none
*
* @return uint8 - SUCCESS or FAILED
*/
uint8 halRfTransmit(void) {
uint16 timeout = 500; // 500 x 100us = 50ms
uint8 status = 0;
// Wait for RSSI to become valid
while (!CC2520_RSSI_VALID_PIN){};
// Reuse GPIO2 for TX_FRM_DONE exception
CC2520_CFG_GPIO_OUT(2, 1 + CC2520_EXC_TX_FRM_DONE);
// Wait for the transmission to begin before exiting (makes sure that this function cannot be called
// a second time, and thereby canceling the first transmission.
while (--timeout > 0) {
CC2520_INS_STROBE(CC2520_INS_STXONCCA);
if (CC2520_SAMPLED_CCA_PIN) {
break;
}
chThdSleepMicroseconds(100);
}
if (timeout == 0) {
status = FAILED;
CC2520_INS_STROBE(CC2520_INS_SFLUSHTX);
} else {
status = SUCCESS;
// Wait for TX_FRM_DONE exception
while (!CC2520_TX_FRM_DONE_PIN) {};
CC2520_CLEAR_EXC(CC2520_EXC_TX_FRM_DONE);
}
// Reconfigure GPIO2
CC2520_CFG_GPIO_OUT(2, CC2520_GPIO_RSSI_VALID);
return status;
}
/***********************************************************************************
* @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;
}
