/1. 程序分别下载到2个开发板，注意两个板都要接上USB电源供电。
//2. 然后按S2后发送信息，发送完毕后蜂鸣器响一下，对方受到信息后同样 响一下。
//3. 而且两个开发板都可以做为发送和接收，一个做为发送，对应另一即为接收,实现及时双向通信。
//4. QX-MCS51开发板上最下角第一个按键
//
#include <reg52.h>
#include <ABSACC.h>
#include <intrins.h>
#include <stdio.h>
//----------------------------------------------------------------------------------------------------------------
#define uint unsigned int
#define uchar unsigned char
//----------------------------------------------------------------------------------------------------------------
#define BYTE_BIT0 0x01
#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;
//---------------------------------------------------发送数据缓冲区-------------------------------------------------
#define TxRxBuf_Len 4
unsigned char TxRxBuf[TxRxBuf_Len]={0x29,0x30,0x31,0x32,};
code TxAddress[4]={0xcc,0xcc,0xcc,0xcc};
char tf;
//----------------------------------------NRF905工作模式控制端口------------------------------------------------------
sbit TXEN=P1^0;
sbit TRX_CE=P3^2;
sbit PWR=P1^1;
//-------------------------------------------------------------------------------------------
sbit LED=P2^3; //蜂鸣器
//----------------------------------------NRF905 数据交换端口---------------------------------------------------
sbit MISO=P1^6;
sbit MOSI=P1^5;
sbit SCK=P1^7;
sbit CSN=P1^3;
//----------------------------------------nrf905状态端口---------------------------------------------------------
sbit AM=P1^4;
sbit DR=P3^3;
sbit CD=P1^2;
//---------------------------------------------------------------------------------------------------------------
//----------------------------------------按键端口-------------------------------------------------------
sbit KEY=P3^0; //QX-MCS51开发板上左下角第一个按键
//----------------------------------------nrf905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
0x04,0x04, //接收发送有效数据长度为4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
};
//================================================延时===========================================================
void nrf905_Delay(int n)
{
uint i;
while(n--)
for(i=0;i<80;i++);
}
//=================================================SPI读函数=======================================================
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;
}
//===========================================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---------------------------------------------
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
PWR=1; // nRF905 power on
TRX_CE=0; // Set nRF905 in standby mode
TXEN=0; // set radio in Rx mode
}
//-----------------------------------------------------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);
}
CSN=1; // Disable Spi
}
//-----------------------------------------------------发送数据打包---------------------------------------------------
void TxPacket(uchar *TxRxBuf)
{
uchar i;
//Config905();
CSN=0;
SpiWrite(WTP); // Write payload command
for (i=0;i<4;i++)
{
SpiWrite(TxRxBuf); // Write 32 bytes Tx data
}
CSN=1;
nrf905_Delay(1); // Spi disable
CSN=0; // Spi enable for write a spi command
SpiWrite(WTA); // Write address command
for (i=0;i<4;i++) // 写入与对方地址一样的地址
{
SpiWrite(TxAddress);
}
CSN=1; // Spi disable
TRX_CE=1; // Set TRX_CE high,start Tx data transmission
nrf905_Delay(1); // while (DR!=1);
TRX_CE=0; // Set TRX_CE low
}
//----------------------------------------------设置发送初始状态---------------------------------------------
void SetTxMode(void)
{
TRX_CE=0;
TXEN=1;
nrf905_Delay(1); // nrf905_Delay for mode change(>=650us)
}
//-----------------------------------------------设置接收初始化---------------------------------------------------
void SetRxMode(void)
{
TXEN=0;
TRX_CE=1;
nrf905_Delay(1); // nrf905_Delay for mode change(>=650us)
}
//-------------------------------------------------判断数据接收状态-----------------------------------------------------
unsigned char CheckDR(void) //检查是否有新数据传入 Data Ready
{
DR=1;
//通过对端口写1，可以使端口为输入状态，这51的 特性。不熟悉者可以参阅51相关书籍作证(将DR端口设置为输入状态。)
if (DR==1)
{
DR=0;
return 1;
}
else
{
return 0;
}
}
//----------------------------------------------------读NRF905接收数据------------------------------------------------------------
void RxPacket(void)
{
uchar i;
nrf905_Delay(1);
// TRX_CE=0; // Set nRF905 in standby mode
nrf905_Delay(100);
TRX_CE=0;
CSN=0; // Spi enable for write a spi command
nrf905_Delay(1);
SpiWrite(RRP);
for (i = 0 ;i < 4 ;i++)
{
TxRxBuf=SpiRead(); // Read data and save to buffer
}
CSN=1;
nrf905_Delay(10);
TRX_CE=1;
}
//--------------------------------------------------------数据接收------------------------------------------------
void RX(void)
{
SetRxMode();
// while (CheckDR()==0); 为了实现双向通信，就不能一直处于接收等待状态，所以注释掉
nrf905_Delay(10);
RxPacket();
if(TxRxBuf[0]==0x29)
{
LED=0;
nrf905_Delay(300);
LED=1;
nrf905_Delay(300);//接收到数据 后闪烁
}
}
//-----------------------------------------------------------------------------------------------------------------
void main(void)
{
nRF905Init();
Config905();
LED=1;
while(1)
{
RX();
if(KEY ==0 )
{
while(KEY==0);
tf = 1 ;
TxRxBuf[0]=0x29;
}
if (tf==1)
{
SetTxMode();
TxPacket(TxRxBuf); // 发送命令数据
LED=0;
nrf905_Delay(300);
LED=1;
nrf905_Delay(300); //发送后蜂鸣器响一下
tf = 0;
}
}
}
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