NucleoF401RE - XBee serial RX/TX with FIFO buffer. RX: Interrupt - FIFO buffering. TX: FIFO buffering - polling (tx_buffer empty). In this program, received data (7bytes format ([000000-7FFFFF]+13(cr)]) is merged to auto-increment message to transfer.
main.cpp@0:0d80708af8ce, 2014-12-06 (annotated)
- Committer:
- nagasm
- Date:
- Sat Dec 06 04:31:53 2014 +0000
- Revision:
- 0:0d80708af8ce
NucleoF401RE + XBee Rx/Tx program.; RX - Interrupt - FIFO buffering.; TX - FIFO buffering - polling (buffer empty).; In this program, received message (7bytes format ([000000-7FFFFF]+13(cr)]) id merged to auto-increment data to transfer.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
nagasm | 0:0d80708af8ce | 1 | #include "mbed.h" |
nagasm | 0:0d80708af8ce | 2 | |
nagasm | 0:0d80708af8ce | 3 | unsigned char rxFIFO[256], txFIFO[256], raw_data[6]; |
nagasm | 0:0d80708af8ce | 4 | unsigned char rx_top, rx_end, tx_top, tx_end, phase; |
nagasm | 0:0d80708af8ce | 5 | |
nagasm | 0:0d80708af8ce | 6 | RawSerial xbee(PA_2, PA_3); |
nagasm | 0:0d80708af8ce | 7 | DigitalOut myled(LED1); |
nagasm | 0:0d80708af8ce | 8 | |
nagasm | 0:0d80708af8ce | 9 | void tx_fifo_check(){ |
nagasm | 0:0d80708af8ce | 10 | if(xbee.writeable() == 1){ |
nagasm | 0:0d80708af8ce | 11 | if(tx_top != tx_end){ |
nagasm | 0:0d80708af8ce | 12 | xbee.putc(txFIFO[tx_end]); |
nagasm | 0:0d80708af8ce | 13 | ++tx_end &= 255; |
nagasm | 0:0d80708af8ce | 14 | } |
nagasm | 0:0d80708af8ce | 15 | } |
nagasm | 0:0d80708af8ce | 16 | return; |
nagasm | 0:0d80708af8ce | 17 | } |
nagasm | 0:0d80708af8ce | 18 | |
nagasm | 0:0d80708af8ce | 19 | int rx_fifo_check(){ |
nagasm | 0:0d80708af8ce | 20 | unsigned char data; |
nagasm | 0:0d80708af8ce | 21 | if(rx_top != rx_end){ |
nagasm | 0:0d80708af8ce | 22 | data = rxFIFO[rx_end]; |
nagasm | 0:0d80708af8ce | 23 | ++rx_end &= 255; |
nagasm | 0:0d80708af8ce | 24 | if (data < 33){ |
nagasm | 0:0d80708af8ce | 25 | phase = 0; |
nagasm | 0:0d80708af8ce | 26 | return(1); |
nagasm | 0:0d80708af8ce | 27 | } |
nagasm | 0:0d80708af8ce | 28 | raw_data[phase] = data; |
nagasm | 0:0d80708af8ce | 29 | if(++phase > 5) phase = 0; |
nagasm | 0:0d80708af8ce | 30 | return(0); |
nagasm | 0:0d80708af8ce | 31 | } |
nagasm | 0:0d80708af8ce | 32 | return(0); |
nagasm | 0:0d80708af8ce | 33 | } |
nagasm | 0:0d80708af8ce | 34 | |
nagasm | 0:0d80708af8ce | 35 | void rx_fifoset(void){ |
nagasm | 0:0d80708af8ce | 36 | rxFIFO[rx_top] = xbee.getc(); |
nagasm | 0:0d80708af8ce | 37 | ++rx_top &= 255; |
nagasm | 0:0d80708af8ce | 38 | return; |
nagasm | 0:0d80708af8ce | 39 | } |
nagasm | 0:0d80708af8ce | 40 | |
nagasm | 0:0d80708af8ce | 41 | void tx_fifoset(unsigned char data){ |
nagasm | 0:0d80708af8ce | 42 | txFIFO[tx_top] = data; |
nagasm | 0:0d80708af8ce | 43 | ++tx_top &= 255; |
nagasm | 0:0d80708af8ce | 44 | return; |
nagasm | 0:0d80708af8ce | 45 | } |
nagasm | 0:0d80708af8ce | 46 | |
nagasm | 0:0d80708af8ce | 47 | unsigned char hex_conv(unsigned char data){ |
nagasm | 0:0d80708af8ce | 48 | data &= 15; |
nagasm | 0:0d80708af8ce | 49 | if(data < 10) return(data+48); |
nagasm | 0:0d80708af8ce | 50 | else return(data+55); |
nagasm | 0:0d80708af8ce | 51 | } |
nagasm | 0:0d80708af8ce | 52 | |
nagasm | 0:0d80708af8ce | 53 | unsigned char conv_hex(unsigned char data){ |
nagasm | 0:0d80708af8ce | 54 | if((data > 47) && (data < 58)) return(data-48); |
nagasm | 0:0d80708af8ce | 55 | else if((data > 64) && (data < 71)) return(data-55); |
nagasm | 0:0d80708af8ce | 56 | return(0); |
nagasm | 0:0d80708af8ce | 57 | } |
nagasm | 0:0d80708af8ce | 58 | |
nagasm | 0:0d80708af8ce | 59 | void tx_message(int data){ |
nagasm | 0:0d80708af8ce | 60 | int i; |
nagasm | 0:0d80708af8ce | 61 | for (i=0; i<6; i++){ |
nagasm | 0:0d80708af8ce | 62 | tx_fifoset(hex_conv((data>>(4*(5-i))) & 15)); |
nagasm | 0:0d80708af8ce | 63 | } |
nagasm | 0:0d80708af8ce | 64 | tx_fifoset(13); |
nagasm | 0:0d80708af8ce | 65 | } |
nagasm | 0:0d80708af8ce | 66 | |
nagasm | 0:0d80708af8ce | 67 | int main(){ |
nagasm | 0:0d80708af8ce | 68 | int i, j, k, sum; |
nagasm | 0:0d80708af8ce | 69 | i = j = k = 0; |
nagasm | 0:0d80708af8ce | 70 | rx_top = rx_end = tx_top = tx_end = phase = 0; |
nagasm | 0:0d80708af8ce | 71 | xbee.baud(38400); |
nagasm | 0:0d80708af8ce | 72 | xbee.attach(&rx_fifoset, xbee.RxIrq); |
nagasm | 0:0d80708af8ce | 73 | while(1){ |
nagasm | 0:0d80708af8ce | 74 | tx_fifo_check(); |
nagasm | 0:0d80708af8ce | 75 | if(rx_fifo_check() == 1){ |
nagasm | 0:0d80708af8ce | 76 | sum = 0; |
nagasm | 0:0d80708af8ce | 77 | for (i=0; i<6; i++){ |
nagasm | 0:0d80708af8ce | 78 | sum += conv_hex(raw_data[i])<<(4*(5-i)); |
nagasm | 0:0d80708af8ce | 79 | } |
nagasm | 0:0d80708af8ce | 80 | tx_message(sum); /* Echo Back */ |
nagasm | 0:0d80708af8ce | 81 | } |
nagasm | 0:0d80708af8ce | 82 | if(++j > 1000000){ |
nagasm | 0:0d80708af8ce | 83 | j = 0; |
nagasm | 0:0d80708af8ce | 84 | myled = !myled; |
nagasm | 0:0d80708af8ce | 85 | k &= 8388607; |
nagasm | 0:0d80708af8ce | 86 | tx_message(k++); |
nagasm | 0:0d80708af8ce | 87 | } |
nagasm | 0:0d80708af8ce | 88 | } |
nagasm | 0:0d80708af8ce | 89 | } |