main.c

本程序是NRF950的程序,主要包括发送和接受程序,希望能对大家有帮助

//------------------------
#include <avr/io.h>
#include <avr/signal.h>
#include <avr/interrupt.h>
#include <compat/twi.h>
#include <avr/delay.h>
#include <avr/pgmspace.h>   
#include <avr/eeprom.h>
//------------------------
//宏定义
#define fosc 7372800 //晶振7.3728MHZ
#define baud 9600	 //波特率

//nrf905
#define CONTROL_PORT PORTD
#define CONTROL_DDR DDRD
#define CONTROL_PIN PIND
#define TRX_CE    PD6
#define TXEN      PD5
#define PWR_UP    PD7
//#define AM        PD1  //INT1
//#define CD	      PD2  //INT2
#define DR	      PD2  //INT0
#define CSN		  PD4

unsigned char tx_data_buf[32]; //发送缓冲区
unsigned char rx_data_buf[32]; //接收缓冲区
unsigned char xxx[10];  //配置RF寄存器的数据缓冲区

//地址寄存器
const unsigned char tx_address_reg_buf[4]={
		0xa5,			//TX_ADDRESS_BYTE0=RX_ADDRESS_BYTE0
		0xb5,			//TX_ADDRESS_BYTE1=RX_ADDRESS_BYTE1
		0xc5,			//TX_ADDRESS_BYTE2=RX_ADDRESS_BYTE2
		0xd5,			//TX_ADDRESS_BYTE3=RX_ADDRESS_BYTE3
			         	  };


//配置寄存器为10个字节
//芯片上电后初始化值为6C 00 44 20 20 E7 E7 E7 E7 E7
//DATASHEET P20
const unsigned char config_reg_buf[10]={
		0x4c,//0b01001100,	//CH_NO[7:0]=76,RFfreq=422.4+76/10=430MHZ
		0x00,//0b00000000,	//bit[7:6]:notused /bit5:AUTO_RETRAN=’0’
                                  //bit4:RX_RED_PWR=’0’/bit[3:2]:PA_PWR=’00’-10dBm
                                  //bit1:HFREQ_PLL=0, PLL=433MHZ /bit0:CH_NO[8]=’0’
		0x44,//0b01000100,	//bit7:not used/bit[6:4]:TX_AFW=’100’4Bytes
					//bit3:not used/bit[2:0]:RX_AFW=’100’4Bytes  
		0x20,//0b00100000, 	//bit[7:6]:not use  /bit[5:0]:RX_PW=’100000'32Bytes
		0x20,//0b00100000,	//bit[7:6]not use  /bit[5:0]TX_PW=’100000’32Bytes
		0xa5,			//RX_ADDRESS_BYTE0=TX_ADDRESS_BYTE0
		0xb5,			//RX_ADDRESS_BYTE1=TX_ADDRESS_BYTE1
		0xc5,			//RX_ADDRESS_BYTE2=TX_ADDRESS_BYTE2
		0xd5,			//RX_ADDRESS_BYTE3=TX_ADDRESS_BYTE3
		0xce //0b11001110    //bit7:CRC_MODE=’1’CRC16  /bit6:CRC_EN=’1’  CRC  Enable
					 //bit[5:3]:XOF=’011’8MHZ  /bit[2]UP_CLK_EN=’1’  Enable
					 //bit[1:0]:UP_CLK_FRE=’11’  500KHZ
	};




volatile unsigned char re_ok=0;

void delay_1us(void);
void delay_nus(unsigned int n);
void delay_1ms(void);
void delay_nms(unsigned int n);

//------------------------

void port_init(void)
{
    //所有端口设为输入，所有端口的上拉电阻有效
	//所有端口输出为高电平
    // PortB
	PORTB = 0xff; 
	DDRB = 0x00;  
	// PortC
	PORTC = 0xff;
	DDRC = 0x00;
	// PortD
	PORTD = 0xff;
	DDRD = 0x00;   
}

/*---------------UART0初始化----------------*/
void uart_init(void)
{
 UCSRB = 0x00; //disable while setting baud rate
 UCSRA = 0x00;
 UCSRC = (1<<URSEL )| 0x06;  //URSEL=1时才能写UCSRC，8位
 UBRRL=(fosc/16/(baud+1))%256;
 UBRRH=(fosc/16/(baud+1))/256;
 UCSRB = 0x18;  //允许接收，允许发送。
 //UCSRB = 0x98;  //允许串口接收中断，允许接收，允许发送。
 
}


void SPI_MasterInit(void)
{
/* 设置MOSI 和SCK SS为输出，其他为输入 */
DDRB |= (1<<PB5)|(1<<PB3)|(1<<PB2);
/* 使能SPI 主机模式，设置时钟速率为fck/16 */
SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0);
}


void SPI_transmit(char cData)
{
/* 启动数据传输 */
SPDR = cData;
/* 等待传输结束 */
while(!(SPSR & (1<<SPIF)))
;
}

unsigned char SPI_receive(void)
{
/* 启动数据传输 */
SPDR = 0x00;
/* 等待传输结束 */
while(!(SPSR & (1<<SPIF)))
;
return SPDR;
}


//串口接收完成中断程序
SIGNAL(SIG_UART_RECV)   
{
 
}

//===============================================
//串口函数	
//===============================================
/*---------------字符输出函数---------------*/
void put1char(unsigned char c)
	{
     while (!(UCSRA&(1<<UDRE)));
	 UDR=c;
	}
/*---------------字符输入函数---------------*/
unsigned char get1char(void)
  	{
	 while (!(UCSRA&(1<<RXC)));
     return UDR;
	}
/*---------------字符串输出函数-------------*/
int puts(char *s)
	{
	while (*s)
		{
		put1char(*s);
		s++;
		}
    put1char(0x0a);//回车换行
	put1char(0x0d);
	return 1;
	}
/*---------不含回车换行的字符串输出函数----*/
void putstr(char *s)
	{
	while (*s)
		{
		put1char(*s);
		s++;
		}
	}
//===============================================
//延时函数	
//===============================================
//1us延时函数
void delay_1us(void)
{
	asm( "nop" );  //4m时为1us,8m时为0.125us，16m时为0.25us.
	asm( "nop" );
	asm( "nop" );
	asm( "nop" );
	asm( "nop" );  //4m时为1us,8m时为0.125us，16m时为0.25us.
	asm( "nop" );
	asm( "nop" );
	asm( "nop" );
}

//n us 延时函数
void delay_nus(unsigned int n)
{
	unsigned int i;
	for(i=0;i<n;i++)delay_1us();
}

//1ms延时函数
void delay_1ms(void)
{
	unsigned int i;
	for(i=0;i<600;i++) delay_1us();
}

//n ms延时函数
void delay_nms(unsigned int n)
{
	unsigned int i;
	for(i=0;i<n;i++)delay_1ms();
}


//======================================================
//以下是有关NRF905的函数
//======================================================
//写TX地址4个字节
void write_tx_address(unsigned char tx_address_bytes_num)
{
	unsigned char i;
	CONTROL_PORT &= ~(1<<CSN);
	SPI_transmit(0x22);//0b00100010 
	i=0;
	while(tx_address_bytes_num--)
	{
		SPI_transmit(tx_address_reg_buf[i]);
		i++;
	}
	CONTROL_PORT |= (1<<CSN);
}

//写TX有效数据32个字节
void write_tx_payload(unsigned char tx_payload_bytes_num)
{
	unsigned char i=0;
	CONTROL_PORT &= ~(1<<CSN);
	SPI_transmit(0x20);//0b00100000
	while(tx_payload_bytes_num--)
	{
		SPI_transmit(tx_data_buf[i]);  
		i++;
	}
	//SPI_transmit(tx_data_buf[1]);
	//SPI_transmit(tx_data_buf[2]);
	CONTROL_PORT |= (1<<CSN);
}


void read_rx_payload(unsigned char rx_payload_bytes_num)
{
	unsigned char i;
	//CSN=0;
	CONTROL_PORT &= ~(1<<CSN);
	SPI_transmit(0x24);//0b00100100
	i=0;
	while(rx_payload_bytes_num--)
	{
		rx_data_buf[i]=SPI_receive();
		i++;
	}
	
	//CSN=1;
	CONTROL_PORT |= (1<<CSN);
}



void send_rx_data_to_pc(void)
{
	unsigned char i;
	i=0;
	for(i=0;i<32;i++)	//send ASCII char'Comait CRM401XNC'use UART
	{
		put1char(rx_data_buf[i]);
	}
}


//发送RF数据
void send_rf_data(void)
{
	unsigned char i;
	write_tx_address(4);
	write_tx_payload(32);
	CONTROL_PORT |= (1<<TRX_CE);
	i=100;
	while(i--);  //等待NRF905数据传输完成
	CONTROL_PORT &= ~(1<<TRX_CE);
}



//发送模式
void transmit_mode(void)
{
 //nrf905进入发送模式
 CONTROL_PORT |= (1<<PWR_UP); 
 CONTROL_PORT |= (1<<TRX_CE);
 CONTROL_PORT |= (1<<TXEN);
 delay_nms(2);  
}


//接收模式
void receive_mode(void)
{
//nrf905进入接收模式
 CONTROL_PORT |= (1<<PWR_UP); 
 CONTROL_PORT |= (1<<TRX_CE);
 CONTROL_PORT &= ~(1<<TXEN);  
 delay_nms(2); 	
}

void read_config(void)
{         
         unsigned char i ;
		 
		 CONTROL_PORT &= ~(1<<CSN);
         SPI_transmit(0x10); //0b00010000
         i =0;
         for(i=0;i<10;i++)
          {
		   xxx[i]=SPI_receive();
          }
		 CONTROL_PORT |= (1<<CSN);
}

void write_config(void)
{
         unsigned char i ;
		 CONTROL_PORT &= ~(1<<CSN);
         SPI_transmit(0x00);  //发送写配置寄存器的命令
         i =0;
         for(i=0;i<10;i++)
         {
		  SPI_transmit(config_reg_buf[i]);
         }
		 CONTROL_PORT |= (1<<CSN);
}

//nrf905初始化
void nrf905_init(void)
{
	unsigned char i;
	delay_nms(10);
	//STANDBY和SPI编程模式
	CONTROL_PORT |= (1<<PWR_UP);  
	CONTROL_PORT &= ~(1<<TRX_CE);
	CONTROL_PORT &= ~(1<<TXEN);
	CONTROL_PORT |= (1<<CSN);
	
	i=0;

	for(i=0;i<32;i++)	//Clear the data buffer 清接收缓冲区
	{	
		rx_data_buf[i]=0;
		tx_data_buf[i]=0;
	}
	write_config();
	
}

//外部中断0中断服务函数
SIGNAL(SIG_INTERRUPT0)
{
  read_rx_payload(32);  //保存在rx_data_buf里
  re_ok=1;
}

//====================================================================
//主程序开始
//====================================================================
int main(void)
{
 //------------------------
 cli();
 port_init();
 uart_init();
 SPI_MasterInit();
 sei();
 
 DDRD |= (1<<PD3);   //LED
 
 CONTROL_DDR |= (1<<TRX_CE);
 CONTROL_DDR |= (1<<TXEN);
 CONTROL_DDR |= (1<<PWR_UP);
 CONTROL_DDR |= (1<<CSN);
 
 //standby 模式
 CONTROL_PORT |= (1<<PWR_UP); 
 CONTROL_PORT &= ~(1<<TRX_CE);
 
 nrf905_init();
 
 receive_mode();  //接收模式
 
 delay_nms(5);
 
 //外部中断0上升沿中断
 MCUCR |= (1<<ISC01)|(1<<ISC00);
 GICR |= (1<<INT0);  
 
 while(1)
   {
    if(re_ok==1)
	{
	 re_ok=0;
     send_rx_data_to_pc();
	 
	 tx_data_buf[0]=rx_data_buf[0]++;
	 tx_data_buf[1]=rx_data_buf[1]++;
	 tx_data_buf[2]=rx_data_buf[2]++;
	 tx_data_buf[3]=rx_data_buf[3]++;
	 tx_data_buf[4]=rx_data_buf[4]++;
	 
	 transmit_mode();  //发射模式
	 send_rf_data(); 
	 receive_mode();  //接收模式
	 
	 PORTD ^= (1<<PD3);   //LED
    }
	
	if(get1char()==0x26)
	{
	 tx_data_buf[0]=0x88;
	 tx_data_buf[1]=0x77;
	 tx_data_buf[2]=0x66;
	 tx_data_buf[3]=0x55;
	 tx_data_buf[4]=0x33;
	 
	 transmit_mode();  //发射模式
	 send_rf_data(); 
	 receive_mode();  //接收模式
	 
	  PORTD ^= (1<<PD3);   //LED
	}
	
	
   /*
	 if(bit_is_set(PIND,2) != 0)   //DR(PD.2)
	 {
	  read_rx_payload(32);  //保存在rx_data_buf里
	  send_rx_data_to_pc();
	 }	
	 
	*/
   }  //while
   
} //main
//====================================================================
//主程序结束
//====================================================================