static void RADIO_HandleStateMachine(void) { uint8_t status; for(;;) { /* will break/return */ switch (RADIO_AppStatus) { case RADIO_INITIAL_STATE: RF1_StopRxTx(); /* will send/receive data later */ RADIO_AppStatus = RADIO_RECEIVER_ALWAYS_ON; /* turn receive on */ break; /* process switch again */ case RADIO_RECEIVER_ALWAYS_ON: /* turn receive on */ RX_POWERUP(); RF1_StartRxTx(); /* Listening for packets */ RADIO_AppStatus = RADIO_READY_FOR_TX_RX_DATA; break; /* process switch again */ case RADIO_READY_FOR_TX_RX_DATA: /* we are ready to receive/send data data */ if (RADIO_isrFlag) { /* Rx interrupt? */ RADIO_isrFlag = FALSE; /* reset interrupt flag */ (void)CheckRx(); /* get message */ RADIO_AppStatus = RADIO_RECEIVER_ALWAYS_ON; /* continue listening */ break; /* process switch again */ } if (CheckTx()==ERR_OK) { /* there was data and it has been sent */ RADIO_AppStatus = RADIO_WAITING_DATA_SENT; break; /* process switch again */ } return; case RADIO_WAITING_DATA_SENT: if (RADIO_isrFlag) { /* check if we have received an interrupt: this is either timeout or low level ack */ RADIO_isrFlag = FALSE; /* reset interrupt flag */ status = RF1_GetStatus(); if (status&RF1_STATUS_RX_DR) { /* data received interrupt */ RF1_ResetStatusIRQ(RF1_STATUS_RX_DR); /* clear bit */ } if (status&RF1_STATUS_TX_DS) { /* data sent interrupt */ RF1_ResetStatusIRQ(RF1_STATUS_TX_DS); /* clear bit */ } if (status&RF1_STATUS_MAX_RT) { /* retry timeout interrupt */ RF1_ResetStatusIRQ(RF1_STATUS_MAX_RT); /* clear bit */ RF1_Write(RF1_FLUSH_TX); /* flush old data */ RADIO_AppStatus = RADIO_TIMEOUT; /* timeout */ } else { RADIO_AppStatus = RADIO_RECEIVER_ALWAYS_ON; /* turn receive on */ } break; /* process switch again */ } return; case RADIO_TIMEOUT: Err((unsigned char*)"ERR: Timeout\r\n"); RADIO_AppStatus = RADIO_RECEIVER_ALWAYS_ON; /* turn receive on */ break; /* process switch again */ default: /* should not happen! */ return; } /* switch */ } /* for */ }
/* called to check if we have something in the RX queue. If so, we queue it */ static uint8_t CheckRx(void) { uint8_t res = ERR_OK; uint8_t RxDataBuffer[RPHY_BUFFER_SIZE]; uint8_t status; RPHY_PacketDesc packet; bool hasRxData; hasRxData = FALSE; packet.flags = RPHY_PACKET_FLAGS_NONE; packet.phyData = &RxDataBuffer[0]; packet.phySize = sizeof(RxDataBuffer); #if NRF24_DYNAMIC_PAYLOAD packet.rxtx = RPHY_BUF_PAYLOAD_START(packet.phyData); #else packet.rxtx = &RPHY_BUF_SIZE(packet.phyData); /* we transmit the data size too */ #endif status = RF1_GetStatus(); if (status&RF1_STATUS_RX_DR) { /* data received interrupt */ hasRxData = TRUE; #if NRF24_DYNAMIC_PAYLOAD uint8_t payloadSize; (void)RF1_ReadNofRxPayload(&payloadSize); if (payloadSize>32) { /* packet with error? */ RF1_Write(RF1_FLUSH_RX); /* flush old data */ return ERR_FAILED; } else { RF1_RxPayload(packet.rxtx, payloadSize); /* get payload: note that we transmit <size> as payload! */ RPHY_BUF_SIZE(packet.phyData) = payloadSize; } #else RF1_RxPayload(packet.rxtx, RPHY_PAYLOAD_SIZE); /* get payload: note that we transmit <size> as payload! */ #endif RF1_ResetStatusIRQ(RF1_STATUS_RX_DR|RF1_STATUS_TX_DS|RF1_STATUS_MAX_RT); /* make sure we reset all flags. Need to have the pipe number too */ } if (status&RF1_STATUS_TX_DS) { /* data sent interrupt */ RF1_ResetStatusIRQ(RF1_STATUS_TX_DS); /* clear bit */ } if (status&RF1_STATUS_MAX_RT) { /* retry timeout interrupt */ RF1_ResetStatusIRQ(RF1_STATUS_MAX_RT); /* clear bit */ } if (hasRxData) { /* put message into Rx queue */ res = RMSG_QueueRxMsg(packet.phyData, packet.phySize, RPHY_BUF_SIZE(packet.phyData), packet.flags); if (res!=ERR_OK) { if (res==ERR_OVERFLOW) { Err((unsigned char*)"ERR: Rx queue overflow!\r\n"); } else { Err((unsigned char*)"ERR: Rx Queue full?\r\n"); } } } return res; }