智能车制作

标题: nrf905 接受程序单片机80C51 [打印本页]

作者: 数据库——嘎嘎 时间: 2012-9-2 19:43
标题: nrf905 接受程序单片机80C51
#include <reg52.h>
#include <ABSACC.h>
#include <intrins.h>
#include <stdio.h>
#define uint unsigned int                   //0 ~ 255
#define uchar unsigned char
//------------------------------------------------------------------------------------------------------------------
#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;//bdata    --->    可位寻址的片内ram
#define DATA7 ((DATA_BUF&BYTE_BIT7) != 0)
#define DATA0 ((DATA_BUF&BYTE_BIT0) != 0)
//sbit  flag =DATA_BUF^7;
//sbit  flag1 =DATA_BUF^0;
//---------------------------------------------------------------------------------------------------------------
#define TxRxBuf_Len 4
unsigned char TxRxBuffer[TxRxBuf_Len];
//----------------------------------------------NRF905控制IO------------------------------------------------------
sbit TXEN=P2^4;
sbit TRX_CE=P0^0;
sbit PWR=P2^5;
//----------------------------------------------NRF905 SPI接口---------------------------------------------------
sbit MISO=P0^3;
sbit MOSI=P0^6;
sbit SCK=P0^4;
sbit CSN=P0^5;
//----------------------------------------nrf905状态标志---------------------------------------------------------
sbit AM=P0^2;
sbit DR=P2^7;
sbit CD=P2^6;
//---------------------------------------------------------------------------------------------------------------
sbit led=P1^0;
//-----------------------------------------------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32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

      };
//---------------------------------------------------NRF905控制命令------------------------------------------------------
#define WC    0x00
#define RC    0x10
#define WTP    0x20
#define RTP    0x21
#define WTA    0x22
#define RTA    0x23
#define RRP    0x24
//---------------------------------------------------------------延时----------------------------------------
void Delay(uchar n)
{
uint k;
while(n--)
for(k=0;k<8;k++);
}

//-------------------------------------------------------NRF905 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;
}
//-------------------------------------------------------NRF905 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
for (i=0;i<11;i++)  // Write configration words  写放配置字
{
   SpiWrite(RFConf[i]);
}
CSN=1;                // Disable Spi
}
//--------------------------------------------------设置接收状态-----------------------------------------------------
void SetRxMode(void)
{
TXEN=0;
TRX_CE=1;
Delay(1);                // delay for mode change(>=650us)
}
//---------------------------------------------------接收状态判断--------------------------------------------------
unsigned char CheckDR(void)    //检查是否有新数据传入 Data Ready
{
if (AM==1&&CD==1&&DR==1)
{
      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(100);
TRX_CE=0;
CSN=0;                   // Spi enable for write a spi command
Delay(1);
SpiWrite(RRP);
for (i = 0 ;i < 4 ;i++)
{
      TxRxBuffer[i]=SpiRead();       // Read data and save to buffer
}
CSN=1;
Delay(10);
TRX_CE=1;
}
//-------------------------------------------------------接收数据------------------------------------------------
void  RX(void)
{
      SetRxMode();       // Set nRF905 in Rx mode
      led=0;
      while (CheckDR()==0);
      RxPacket();
      while(AM==1||DR==1);
}

void ini_uart()
{
      TMOD=0x20; //T1方式2,用于UART波特率
      TH1=0xFD;
      TL1=0xFD; //UART波特率设置:9600
      TR1=1;

      SCON=0x50; //UART方式1:8位UART; REN=1:允许接收
      PCON=0x00; //SMOD=0:波特率不加倍
      TI = 0;
      RI = 0;
      EA = 1;
      ES=0;

}

//------------------------------------------------------主函数---------------------------------------------------
void main(void)
{ uchar j;
nRF905Init();
Config905();
ini_uart();
while(1)
{
      RX();
      Delay(10);
      CSN=0;
      led=0;
      Delay(5000);
      led=1;
      Delay(5000);
      for (j=0;j<4;j++)
      {
      SBUF = TxRxBuffer[j];
      while (TI == 0);
      TI = 0;
      }
      CSN=1;
      Delay(1);
      }

}

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