CE：RX或TX模式选择
CSN：SPI片选信号
SCK：SPI时钟
MOSI：SPI数据输入
MISO：SPI数据输出
IRQ：可屏蔽中断脚

51测试程序
实测可用!

#define TX_ADR_WIDTH    5
#define RX_ADR_WIDTH    5
#define TX_PLOAD_WIDTH  32
#define RX_PLOAD_WIDTH  32#define MAX_TX  	0x10	//达到最大发送次数中断
#define TX_OK   	0x20	//TX发送完成中断
#define RX_OK   	0x40	//接收到数据中断const uchar TX_ADDRESS[TX_ADR_WIDTH]={0xEE,0xDD,0xCC,0xBB,0xAA};	//发送地址
const uchar RX_ADDRESS[RX_ADR_WIDTH]={0xAA,0xBB,0xCC,0xDD,0xEE};sbit CE   = P2^7;
sbit CSN  = P2^6;
sbit MISO = P2^3;
sbit MOSI = P2^4;
sbit SCK  = P2^5;
sbit IRQ  = P2^2;sbit LED=P1^0;void delay_us(uchar num)
{uchar i; for(i=0;i>num;i++)_nop_();
}void delay(uint t)
{uchar k;while(t--)for(k=0;k<200;k++);
}uchar SPI_RW(uchar byte)
{uchar bit_ctr;for(bit_ctr=0;bit_ctr<8;bit_ctr++) // output 8-bit{MOSI = (byte & 0x80); // output 'byte', MSB to MOSIbyte = (byte << 1); // shift next bit into MSB..SCK = 1; // Set SCK high..byte |= MISO; // capture current MISO bitSCK = 0; // ..then set SCK low again}return(byte); // return read byte
}uchar SPI_Write_Reg(uchar reg, uchar value)
{uchar status;CSN = 0; // CSN low, init SPI transactionstatus = SPI_RW(reg); // select registerSPI_RW(value); // ..and write value to it..CSN = 1; // CSN high againreturn(status); // return nRF24L01 status byte
}uchar SPI_Write_Buf(uchar reg, uchar *pBuf, uchar bytes)
{uchar status,byte_ctr;CSN = 0; // Set CSN low, init SPI tranactionstatus = SPI_RW(reg); // Select register to write tofor(byte_ctr=0; byte_ctr<bytes; byte_ctr++) // then write allSPI_RW(*pBuf++);CSN = 1; // Set CSN high againreturn(status); // return nRF24L01 status byte
}void RX_Mode_Init(void)
{CE=0;SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH);SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH);SPI_Write_Reg(WRITE_REG + EN_AA, 0x01); // Enable Auto.Ack:Pipe0SPI_Write_Reg(WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0SPI_Write_Reg(WRITE_REG + RF_CH, 0);SPI_Write_Reg(WRITE_REG + RX_PW_P0, TX_PLOAD_WIDTH);SPI_Write_Reg(WRITE_REG + RF_SETUP, 0x0f);SPI_Write_Reg(WRITE_REG + CONFIG, 0x0f); // Set PWR_UP bit, enableCE = 1; // Set CE pin high to enable RX device
}uchar SPI_Read_Reg(uchar reg)
{uchar reg_val;CSN = 0; // CSN low, initialize SPI communicationSPI_RW(reg); // Select register to read from..reg_val = SPI_RW(0); // ..then read registervalueCSN = 1; // CSN high, terminate SPI communicationreturn(reg_val); // return register value
}uchar NRF24L01_TxPacket(uchar *txbuf)
{uchar state;CE=0;SPI_Write_Buf(WR_TX_PLOAD,txbuf,TX_PLOAD_WIDTH); //写数据到TX_BUFCE=1;while(IRQ==1); //等待发送完成LED = ~LED;state=SPI_Read_Reg(STATUS);  SPI_Write_Reg(WRITE_REG+STATUS,state); //清除中断标志TX_DS或MAX_RTif(state&MAX_TX) //达到最多重发中断{SPI_Write_Reg(FLUSH_TX,0xff); //清除TX FIFO寄存器return MAX_TX; }if(state&TX_OK) //发送完成{return TX_OK;}return 0xff; //发送失败
}void Send_Buf(uchar *buf)
{CE=0;SPI_Write_Reg(WRITE_REG+CONFIG,0x0e);CE=1;delay_us(15);NRF24L01_TxPacket(buf);CE=0;SPI_Write_Reg(WRITE_REG+CONFIG, 0x0f);CE=1;	
}int main()
{uchar buf[TX_PLOAD_WIDTH];RX_Mode_Init();buf[0]=2; //无线串口模块需要第一位标识长度(忽略)buf[1]=0xaa;buf[2]=0x55;while(1){Send_Buf(buf);delay(1000);}
}

模块不能自发自收

TX_ADDR和RX_ADDR_P0地址可以相同。但是TX_ADDR是目标板地址，RX_ADDR_P0是本模块地址。只有收发地址配置正确才能收发成功

最主要是RX_Mode_Init中寄存器的配置：
RF_CH，射频通道频率。收发必须一致（F0= 2400 + RF_CH [MHz]）
RF_SETUP，射频寄存器。数据传输速率、发射功率、低噪声放大增益，收发必须一致
CRCO，校验方式。收发必须一致