uint8 SendByCSMA(u8 *buff,uint8 length)
{
uint8 cca_value = 0;
uint32 wait_time = 0;
uint32 q,w;
//wait_time = ((MAX_DEVICE_NUM - EndPointDevice.free_node)*SLOT_LENGTH)/10;
q=MAX_DEVICE_NUM - EndPointDevice.free_node;
w=q*SLOT_LENGTH;
wait_time=w/100;
while(Frame_Time<=wait_time); //等待到达CSMA时隙 超帧内时间<=负载数*时隙长度
//TIME1_LOW;
CSMABackOff();
//TIME1_HIGH;
cca_value = (A7139_GetRSSI()+A7139_GetRSSI())/2;
if(cca_value<CCA)
{
SendPack();
RXMode();
}
else
{
CSMABackOff();
CSMA_BackOff_Count++;
}
if(CSMA_BackOff_Count>CSMA_BACKOFF_TIME)
return CSMA_FAIL;
else
return CSMA_SUCCESS;
}
uint8 RecvDataACK()
{
send_time = Frame_Time;
while(GIO2==0)
{
if(Frame_Time>send_time+DATAACK_TIMEOUT) //60为DataACK接收超时，在收到ACK时不会进入if内
{
TIME1_LOW;
resend_count++;
EndPointDevice.data_ack = 0;
RXMode();
//TIME1_HIGH;
PostTask(EVENT_CSMA_RESEND);
return 0;
}
}
A7139_ReadFIFO(DataRecvBuffer,MAX_PACK_LENGTH);
RXMode();
if(PackValid()&&(Unpack(DataRecvBuffer) == DATAACK_TYPE)) //如果收到正确的ACK
{
DataACKHandler();
if(EndPointDevice.power == 1)
{
A7139_DeepSleep();
DIS_INT;
}
return 1;
}
else //否则进入CSMA阶段
{
PostTask(EVENT_CSMA_RESEND);
EndPointDevice.data_ack = 0;
return 0;
}
}
bool NRFLib::wait_for_message(unsigned char buf[], int wait) {
if (_txmode)
RXMode();
unsigned char received;
for (int i=0; i<wait; i++) {
received = receive_message(buf);
if (received) return true;
delay(1);
}
return false;
}
bool NRFLib::receive_message(unsigned char buf[]) {
if (_txmode)
RXMode();
unsigned char status = SPI_Read(STATUS); // read register STATUS's value
unsigned char fifo = SPI_Read(0x17);
//if(status&RX_DR){ // if receive data ready (TX_DS) interrupt
if (!(fifo&1)) {
SPI_Read_Buf(RD_RX_PLOAD, buf, _payload); // read playload to rx_buf
//flushRX(); // clear RX_FIFO
SPI_RW_Reg(WRITE_REG+STATUS,0x70); //0x70); // clear RX_DR or TX_DS or MAX_RT interrupt flag
return true;
}
return false;
}
void DataSend(void)
{
//before_slot_wake = (((EndPointDevice.cluster_innernum-1)*SLOT_LENGTH)-WAKE_TIME)+5000;
//为什么写一起就不对！！！
a = (EndPointDevice.cluster_innernum-1);
b = a*SLOT_LENGTH;
c = b + 5000; //每个时隙向后移5ms，让中继切换状态
before_slot_wake = (c-WAKE_TIME)/100;
DIS_INT;
while(Frame_Time<=before_slot_wake);
EndPointDevice.data_ack = 0;
A7139_Wake();
CreatSendData();
TIME1_LOW;
SendPack();
RXMode();
ack_flag = RecvDataACK();
if(ack_flag == 1)
{
A7139_Sleep();
}
else
{
EN_INT;
//TIME1_HIGH;
//delay_ms(5);
//TIME1_LOW;
//delay_ms(5);
//TIME1_HIGH;
}
if((EndPointDevice.power == 0))
EN_INT;
}
bool NRFLib::data_ready(void){
if (_txmode)
RXMode();
unsigned char status = SPI_Read(STATUS); // read register STATUS's value
return (status & RX_DR);
}
