NRF905无线模块收发程序

#include <AT89X52.h> #include <ABSACC.h> #include <intrins.h> #include <stdio.h> #define uint unsigned int #define uchar unsigned char //------------------------------------------------------位表示----------------------------------------------- #define BYTE_BIT0 0x01 #define BYTE_BIT1 0x02 #define BYTE_BIT2 0x04 #define BYTE_BIT3 0x08 #define BYTE_BIT4 0x10 #define BYTE_BIT5 0x20 #define BYTE_BIT6 0x40 #define BYTE_BIT7 0x80 //---------------------------------------------------------------------------------------------------------------- bdata unsigned char DATA_BUF; #define DATA7 ((DATA_BUF& BYTE_BIT7) != 0) #define DATA0 ((DATA_BUF& BYTE_BIT0) != 0) sbit flag = DATA_BUF^7; sbit flag1 = DATA_BUF^0; //------------------------------------------NRF905控制IO------------------------------------------------------ sbit TXEN=P2^0; sbit TRX_CE=P2^1; sbit MISO=P2^4; sbit MOSI=P2^5; sbit SCK=P2^6; sbit CSN=P2^7; sbit AM=P2^2; sbit DR=P1^7; sbit CD=P0^7; //--------------------------------------------------NRF905的SPI控制指令----------------------------------- #define WC 0x00 #define RC 0x10 #define WTP 0x20 #define RTP 0x21 #define WTA 0x22 #define RTA 0x23 #define RRP 0x24 //-----------------------------------------------NRF905寄存器配置--------------------------------------- unsigned char idata RFConf[11]= { 0x00, //配置命令// 0x4c, //CH_NO,配置频段在430MHZ 0x0C, //输出功率为10db,不重发，节电为正常模式 0x44, //地址宽度设置，为4字节 0x01,0x01, //接收发送有效数据长度为1字节 0xCC,0xCC,0xCC,0xCC, //接收地址 0x58, //CRC充许，8位CRC校验，外部时钟信号不使能，16M晶振 }; unsigned char test_data= 0xFF; unsigned char Rx1[1]={0xFF}; code TxAddress[4]={0xcc,0xcc,0xcc,0xcc}; //-----------------------------------------------延时-------------------------------------------------------------- static void delay(uchar n) { uint i; while(n--) for(i=0;i<80;i++); } //----------------------------------------------SPI写函数--------------------------------------------------------- void SpiWrite(unsigned char send) { unsigned char i; DATA_BUF=send; for (i=0;i<8;i++) { if (DATA7) //总是发送最高位 { MOSI=1; } else { MOSI=0; } SCK=1; DATA_BUF=DATA_BUF<<1; SCK=0; } } //---------------------------------------------初始化nRF905状态--------------------------------------------- void nRF905Init(void) { CSN=1; // Spi disable SCK=0; // Spi clock line init low DR=1; // Init DR for input AM=1; // Init AM for input CD=1; // Init CD for input TRX_CE=0; // Set nRF905 in standby mode TXEN=0; // set radio in Rx mode _nop_(); } //----------------------------------------------NRF905初始化寄存器------------------------------------------ void Config905(void) { uchar i; CSN=0; // Spi enable for write a spi command //SpiWrite(WC); // Write config command写放配置命令 for (i=0;i<11;i++) // Write configration words 写放配置字 { SpiWrite(RFConf[i]); } CSN=1; // Disable Spi } //----------------------------------------打包待发送的数据----------------------------------------------- void TxPacket(void) { uchar i; CSN=0; SpiWrite(WTP); // Write payload command for (i=0;i<1;i++) { SpiWrite(test_data); // Write 32 bytes Tx data } // Spi enable for write a spi command CSN=1; delay(2); // Spi disable CSN=0; // Spi enable for write a spi command SpiWrite(WTA); // Write address command for (i=0;i<4;i++) // Write 4 bytes address { SpiWrite(TxAddress[i]); } CSN=1; // Spi disable TRX_CE=1; // Set TRX_CE high,start Tx data transmission delay(1); //while (DR != 1); TRX_CE=0; // Set TRX_CE low } //--------------------------------------------设置发送模式-------------------------------------------------- void SetTxMode(void) { TRX_CE=0; TXEN=1; delay(1); // delay1 for mode change(>=650us) delay(20); } //--------------------------------------------------------------------------------------------------------------- unsigned char CheckCD(void) //Pin->检查是否已存在 同频率载波 { if (CD==1) { return 1; } else { return 0; } } //---------------------------------------------------数据发送------------------------------------------------- void TX(void) { SetTxMode();// Set nRF905 in Tx mode TxPacket();// Send data by nRF905 CheckCD(); // 返回CD的当前电平 } //-------------------------------------------------SPI读1字节函数------------------------------------------------- unsigned char SpiRead(void) { unsigned char j; for (j=0;j<8;j++) { DATA_BUF=DATA_BUF<<1; SCK=1; if (MISO) //读取最高位，保存至最末尾，通过左移位完成整个字节 { DATA_BUF|=BYTE_BIT0; } else { DATA_BUF&=~BYTE_BIT0; } SCK=0; } return DATA_BUF; } //--------------------------------------------------设置接收状态-------------------------------------------------- void SetRxMode(void) { TXEN=0; TRX_CE=1; delay(2); // delay for mode change(>=650us) // Delay(2); } //--------------------------------------------------判断是否接收数据--------------------------------------------- unsigned char CheckDR(void) //检查是否有新数据传入 Data Ready { if (DR==1&&TRX_CE==1 && TXEN==0) { //Delay(30); return 1; } else { return 0; } } //--------------------------------------------------读取接收缓冲区数据----------------------------------------- void RxPacket(void) //读数据 { uchar i; // Delay(1); // TRX_CE=0; // Set nRF905 in standby mode // Delay(2); TRX_CE=0; CSN=0; // Spi enable for write a spi command delay(1); SpiWrite(RRP); for (i = 0 ;i < 1 ;i++) { Rx1[i]=SpiRead(); // Read data and save to buffer } CSN=1; TRX_CE=1; } //-------------------------------------------------数据接收---------------------------------------------------- void RX(void) { SetRxMode(); // Set nRF905 in Rx mode while ((CheckDR()==0)) { } RxPacket(); P0=Rx1[0]; } //---------------------------------------------------------------------------------------------------------------- void delay1(uint i) { for(;i>0;i--) ; } void SET_NRF() { delay1(500); TX(); P1_0=~P1_0; } void main(void) { nRF905Init(); Config905(); P3=0XFF; P0=0xff; while(1) { test_data=P3; SET_NRF(); while(P3_7 == 0) { RX(); } } }