$B%j%9%H(B2-3-2.txt

$B"#%j%9%H(B2-3-2$B"#(B

#include "mbed.h"

unsigned char rxFIFO[256], txFIFO[256], raw_data[6];	// FIFO$B%P%C%U%!Ey$NDj5A(B
unsigned char rx_top, rx_end, tx_top, tx_end, phase;	// FIFO$B%]%$%s%?Ey$NDj5A(B

RawSerial xbee(PA_2, PA_3);
DigitalOut myled(LED1);

void tx_fifo_check(){
    if(xbee.writeable() == 1){			// $B%7%j%"%kAw?.%P%C%U%!$,!V6u!W$G$"$k$+(B?
        if(tx_top != tx_end){			// FIFO$BAw?.%P%C%U%!$KAw?.%G!<%?$,$"$k$+(B?
            xbee.putc(txFIFO[tx_end]);		// FIFO$BAw?.%P%C%U%!$+$i(B1$B%P%$%H$r(BXBee$BAw?.(B
            ++tx_end &= 255;			// FIFO$BAw?.FI$_=P$7%]%$%s%?$r(B1$B$D?J$a$k(B
        }
    }
    return;
}

int rx_fifo_check(){
    unsigned char data;
    if(rx_top != rx_end){				// FIFO$B<u?.%P%C%U%!$K<u?.%G!<%?$,$"$k$+(B?
        data = rxFIFO[rx_end];			// 1$B%P%$%H$r(BFIFO$B<u?.%P%C%U%!$+$i<u$1$H$k(B
        ++rx_end &= 255;				// FIFO$BAw?.FI$_=P$7%]%$%s%?$r(B1$B$D?J$a$k(B
        if (data < 33){
            phase = 0;
            return(1);					// $BM-8z%G!<%?$J$i%a%$%s$KJV$9(B
        }
        raw_data[phase] = data;			// 7$B%P%$%H%U%)!<%^%C%H$K@Q$`(B
        if(++phase > 5) phase = 0;
        return(0);
    }
    return(0);
}

void rx_fifoset(void){
    rxFIFO[rx_top] = xbee.getc();		// $B<u?.3d$j9~$_$,$"$l$P%G!<%?$r(BFIFO$B<u?.%P%C%U%!$K@Q$`(B
    ++rx_top &= 255;					// FIFO$B<u?.=q$-9~$_%]%$%s%?$r(B1$B$D?J$a$k(B
    return;
}

void tx_fifoset(unsigned char data){
    txFIFO[tx_top] = data;				// $B%G!<%?$r(BFIFO$BAw?.%P%C%U%!$K@Q$`(B
    ++tx_top &= 255;					// FIFO$BAw?.=q$-9~$_%]%$%s%?$r(B1$B$D?J$a$k(B
    return;
}

unsigned char hex_conv(unsigned char data){	// $B<u$1$H$C$??tCM(B(0-15)$B$r(B16$B?JJ8;z$KJQ49(B
    data &= 15;
    if(data < 10) return(data+48);
    else return(data+55);
}

unsigned char conv_hex(unsigned char data){	// $B<u$1$H$C$?(B16$B?JJ8;z$r?tCM(B(0-15)$B$KJQ49(B
    if((data > 47) && (data < 58)) return(data-48);
    else if((data > 64) && (data < 71)) return(data-55);
    return(0);
}

void tx_message(int data){	// $B<u$1$H$C$?(B24$B%S%C%H?tCM$r(B7$B%P%$%H%U%)!<%^%C%H$N%a%C%;!<%8$GAw?.(BFIFO$B$K@Q$`(B
    int i;
    for (i=0; i<6; i++){
        tx_fifoset(hex_conv((data>>(4*(5-i))) & 15));
    }
    tx_fifoset(13);
}

int main(){
    int i, j, k, sum;
    i = j = k = 0;
    rx_top = rx_end = tx_top = tx_end = phase = 0; 
    xbee.baud(38400);
    xbee.attach(&rx_fifoset, xbee.RxIrq);		// XBee$B<u?.3d$j9~$_$N@_Dj(B
    while(1){
        tx_fifo_check();						// $BAw?.(BFIFO$B$r%A%'%C%/(B
        if(rx_fifo_check() == 1){				// $B<u?.(BFIFO$B$r%A%'%C%/(B
            sum = 0;
            for (i=0; i<6; i++){
                sum += conv_hex(raw_data[i])<<(4*(5-i));
            }
            tx_message(sum); 				// $B<u?.$7$?%a%C%;!<%8$rAw?.(BFIFO$B$K@Q$`(B($B%(%3!<%P%C%/(B)
        }
        if(++j > 1000000){
            j = 0;
            myled = !myled;
            k &= 8388607;
            tx_message(k++); 				// $B%$%s%/%j%a%s%HCM$r%a%C%;!<%8$H$7$FAw?.(BFIFO$B$K@Q$`(B
        }
    }
}

========================
mbed$B%5%$%H(B
http://developer.mbed.org/users/nagasm/code/CQ_nagasm_02_serialRXTX_FIFO/
$B$K$F8x3+Cf(B
========================
