master._c

这是用C编的nrf905的通讯程序

//master

//最关键的是SPI的初始化，MSB首位和极性方式00，极性方式错误，数据则不正确

#include <iom16v.h>
#include <macros.h>

#include "config.h"
#include "nrf905.h"

#define MASTER  //编译控制是主机还是从机



#define T0N 25
void DelayUs(uint);
void DelayMs(uchar);
//32字节数据包发送时间 
//=650us_StartUp+200us_Preamble+(4+32+2)Byts*8Bit/50000bps*1000000us=6.6ms
#define RFTN 25  //发送测试间隔 10*20ms


bit bTimer,bRfSend;
uchar T0Cnt,RfCnt;

void port_init(void)
{
 PORTA = 0x0F;
 DDRA  = 0xF0;
 PORTB = BIT(AM)|BIT(CD)|BIT(DR)|BIT(MISO);
 DDRB  = BIT(CSN)|BIT(MOSI)|BIT(SCK);
 PORTC = 0x00;
 DDRC  = 0x00;
 PORTD = BIT(uPCLK)|BIT(2);
 DDRD  = BIT(TRXCE)|BIT(TX_EN)|BIT(PWR)|BIT(LED);
}


//TIMER0 initialize - prescale:1024
// WGM: Normal
// desired value: 20mSec
// actual value: 19.861mSec (0.7%)
void timer0_init(void)
{
 TCCR0 = 0x00; //stop
 TCNT0 = 0x71; //set count
 OCR0  = 0x8F;  //set compare
 TCCR0 = 0x05; //start timer
}

#pragma interrupt_handler timer0_ovf_isr:10
void timer0_ovf_isr(void)
{
 TCNT0 = 0x29; //reload counter value
 
 if (--T0Cnt==0)
   {T0Cnt=T0N;
    bTimer=1;
    }
if (--RfCnt==0)
   {RfCnt=RFTN;
    bRfSend=1;
    }
}

//SPI initialize
void spi_init(void)
{uchar temp;

 //SPCR = 0xD1; //SPI中断允许,SPI允许，主机模式，MSB，极性方式00，1/16系统时钟速率
 SPCR = 0x51; //不使用SPI中断,其它同上
 SPSR = 0x00; //setup SPI
 
 temp = SPSR; //!!!
 temp = SPDR; //清空SPI，和中断标志，使SPI空闲    
}


//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer0_init();
 
 spi_init();

 
 MCUCR = BIT(ISC01); //下降沿触发
 GICR  = 0x00;
 TIMSK = 0x05; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}



//接收处理
void RfRecvProc()
{uchar i;

   if ((PINB&(1<<AM))==0) return;//一般先AM=1指示地址匹配对
    
   if ((PINB&(1<<DR))==0) return;//DR=1时表示数据接收对而且Crc正确
   
   //已经接收到数据
   nrf905_ReadData();//读出...
   for (i=0;i<SIZE;i++)
   { if (RxBuf[i]!=(i+i)) 
        return;
   }
   
   //数据接收正确...灯指示
   CPL(PORTD,LED);
   
   //从机回送数据包,这样双方都能指示是否收到有效数据包
   #ifndef MASTER
     //RfSendProc();
   #endif
}

//发送测试
void RfSendProc()
{uchar i;
   for (i=0;i<SIZE;i++) TxBuf[i]=key;
   nrf905_SendData();//发送测试数据
   nrf905_RxOn();//重新回到接收状态
}

void TimerFunc()
{
   bTimer=0;
   //WDR();//clear WDT
   
   CPL(PORTD,LED);
   //SPDR=66;
}

void SystemIni()
{
  T0Cnt=T0N;
  RfCnt=RFTN;
}

void DelayMs(uchar ms)
{char i;
for (i=0;i<ms;i++)
  {DelayUs(1000);
  }
  return;
}

void DelayUs(uint us)
{uint i;
  for (i=0;i<us;i++)
  {NOP();NOP();NOP();NOP();NOP();NOP();
  }
}




////////////////////////////key interrupt/////////////////////////////////



#pragma interrupt_handler int0_isr:iv_INT0

void int0_isr(void)
{
uchar key_buf=16,i;
GICR=0x00; //关闭中断使能
DDRA=0xf0; //行列反转读取键盘的值
PORTA=0x0f;
if((~PINA)&0x01)
key_buf=0;
else if((~PINA)&0x02)
key_buf=1;
else if((~PINA)&0x04)
key_buf=2;
else if((~PINA)&0x08)
key_buf=3;
DDRA=0x0f;
PORTA=0xf0;
DelayUs(2000);
if((~PINA)&0x10)
key_buf+=0;
else if((~PINA)&0x20)
key_buf+=4;
else if((~PINA)&0x40)
key_buf+=8;
else if((~PINA)&0x80)
key_buf+=12;
else
key_buf=16;

if(key_buf!=16)
{
key=key_buf;

RfSendProc();
key_buf=16;

while((~PINA)&0xf0) ;//检测按键是否释放，若没有释放就一直循环
}

DDRA=0xf0;
PORTA=0x0f;
GIFR=0x40;
GICR=0x40; //中断复位
}


///////////////////////key over/////////////////////////////////////////





void main()
{
   init_devices();
   SystemIni();
   nrf905_Init();
   GICR  = BIT(INT0);

   while (1)
   {  
     RfRecvProc();//接收处理
   }
   
}