g_rx.c

这个是我自己写的一个改进的9E5接受程序

#include <Nordic\reg9e5.h>

#define HFREQ 0                     // 0=433MHz, 1=868/915MHz
bit rx_rqst;
char rcv_data;

unsigned char SpiReadWrite(unsigned char b)
{
    EXIF &= ~0x20;                  // spi接口设置函数
    SPI_DATA = b;                   // Move byte to send to SPI data register
    while((EXIF & 0x20) == 0x00)    // Wait until SPI hs finished transmitting
        ;
    return SPI_DATA;
}


void PutChar(char c)                 
{
    while(!TI)                                   //输出字符函数 
        ;
	TI = 0;
    SBUF = c;
}

void PutString(const char *s)
{
    while(*s != 0)                               //输出字符串函数
        PutChar(*s++);
}



unsigned char ReceivePacket()
{
    unsigned char b;

    TRX_CE = 1;

    while(DR == 0)
        ;
    RACSN = 0;
    SpiReadWrite(RRP);
    b = SpiReadWrite(0);
    RACSN = 1;
    TRX_CE = 0;
    return b;
}

void Receiver(void)
{
    unsigned char b;
    TXEN = 0;
    for(;;)
    {
        b = ReceivePacket();
        P0 = (b >> 1);
	if (rx_rqst==1)
	{  rx_rqst=0; PutChar(rcv_data);}
    }
}

void uart_init(void)
{
    TH1 = 0xE6;                      //串口初始化函数 19200@16MHz (when T1M=1 and SMOD=1)
    CKCON |= 0x30;                  // T1M=1 (/4 timer clock)
    PCON = 0x80;                    // SMOD=1 (double baud rate)
    SCON = 0x52;                    // Serial mode1, enable receiver
    TMOD = 0x20;                    // Timer1 8bit auto reload 
    TR1 = 1;                        // Start timer1
    
}


void Init(void)
{
    unsigned char tmp;              //芯片初始化

    P0_ALT = 0x06;
    P0_DIR = 0x02;

    SPICLK = 0;                     // Max SPI clock
    SPI_CTRL = 0x02;                // Connect internal SPI controller to Radio

    // Configure Radio:
    RACSN = 0;
    SpiReadWrite(WRC | 0x03);       // Write to RF config address 3 (RX payload)
    SpiReadWrite(0x01);             // One byte RX payload
    SpiReadWrite(0x01);             // One byte TX payload
    RACSN = 1;

    RACSN = 0;
    SpiReadWrite(RRC | 0x01);       // Read RF config address 1
    tmp = SpiReadWrite(0) & 0xf1;   // Clear the power and frequency setting bits
    RACSN = 1;

    RACSN = 0;
    SpiReadWrite(WRC | 0x01);      // Write RF config address 1
                                   // Change to 433 or 868/915MHz defined by HFREQ above:
    SpiReadWrite(tmp | (HFREQ << 1));
    RACSN = 1;

    RACSN = 0;
    SpiReadWrite(RRC | 0x09);       // Read RF config Rx_deepess 1
    tmp = SpiReadWrite(0) | 0x04;   // Clear the power and frequency setting bits
    RACSN = 1;


    RACSN = 0;
    SpiReadWrite(WRC | 0x09);       // Write to RF config Rx_deepess 9 (cpu clk)
    SpiReadWrite(tmp);             // One byte RX cpu clk
    RACSN = 1;



}

void DR_ISR(void) interrupt 10
{

  EXIF = EXIF & 0xBF;

    RACSN = 0;
    SpiReadWrite(RRP);
    rcv_data = SpiReadWrite(0);
    
    RACSN = 1;

    if (!rcv_data )
      { rx_rqst=1; }

}

 
void main(void)
{
    Init();
    uart_init();
 
    EX4 = 1;
    PX4 = 1;
    EA = 1;
    
    Receiver();
}