Dominic Ottaviano / XBEE_900HP_SPI

This is an experimental driver for the XBee 900 HP pro module's SPI connection. This driver is unfinished and stability is not guaranteed. Use with caution.

Dependents:   Sentinel_BASE Sentinel_NODE

xbee900hp.cpp@0:8c8a8244e590, 2015-04-20 (annotated)

Committer:
ottaviano3
Date:
Mon Apr 20 21:04:26 2015 +0000
Revision:
0:8c8a8244e590
Child:
1:b97d46c5d7ce
First revision XBee 900 HP SPI driver

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ottaviano3 0:8c8a8244e590 1 #include "xbee900hp.h"
ottaviano3 0:8c8a8244e590 2
ottaviano3 0:8c8a8244e590 3 /**
ottaviano3 0:8c8a8244e590 4 * Initialize the xBee Module
ottaviano3 0:8c8a8244e590 5 */
ottaviano3 0:8c8a8244e590 6 xbee900hp::xbee900hp(PinName pin_mosi,PinName pin_miso,PinName pin_sck,PinName pin_attn, PinName pin_rst, PinName pin_dout)
ottaviano3 0:8c8a8244e590 7 : _pin_rst(pin_rst), _pin_attn(pin_attn), _pin_dout(pin_dout), _xbeespi(pin_mosi,pin_miso,pin_sck)
ottaviano3 0:8c8a8244e590 8 {
ottaviano3 0:8c8a8244e590 9 _xbeespi.format(8,0);
ottaviano3 0:8c8a8244e590 10 _xbeespi.frequency(1000000);
ottaviano3 0:8c8a8244e590 11
ottaviano3 0:8c8a8244e590 12 reset();
ottaviano3 0:8c8a8244e590 13 }
ottaviano3 0:8c8a8244e590 14
ottaviano3 0:8c8a8244e590 15 /**
ottaviano3 0:8c8a8244e590 16 * Destructor
ottaviano3 0:8c8a8244e590 17 */
ottaviano3 0:8c8a8244e590 18 xbee900hp::~xbee900hp() {}
ottaviano3 0:8c8a8244e590 19
ottaviano3 0:8c8a8244e590 20
ottaviano3 0:8c8a8244e590 21
ottaviano3 0:8c8a8244e590 22 /**
ottaviano3 0:8c8a8244e590 23 * Reset xBee to SPI mode
ottaviano3 0:8c8a8244e590 24 */
ottaviano3 0:8c8a8244e590 25 void xbee900hp::reset()
ottaviano3 0:8c8a8244e590 26 {
ottaviano3 0:8c8a8244e590 27 // Set Xbee to SPI mode
ottaviano3 0:8c8a8244e590 28 _pin_dout = 0;
ottaviano3 0:8c8a8244e590 29 _pin_rst = 0;
ottaviano3 0:8c8a8244e590 30 // Minimum pulse is 1ms
ottaviano3 0:8c8a8244e590 31 wait_ms(1);
ottaviano3 0:8c8a8244e590 32 _pin_rst = 1;
ottaviano3 0:8c8a8244e590 33
ottaviano3 0:8c8a8244e590 34 // Wait for asst pin to go low to indicate SPI mode
ottaviano3 0:8c8a8244e590 35 while(_pin_attn != 0) { }
ottaviano3 0:8c8a8244e590 36
ottaviano3 0:8c8a8244e590 37 _pin_dout = 1;
ottaviano3 0:8c8a8244e590 38
ottaviano3 0:8c8a8244e590 39 // wait for module to come back online
ottaviano3 0:8c8a8244e590 40 wait_ms(500);
ottaviano3 0:8c8a8244e590 41 }
ottaviano3 0:8c8a8244e590 42
ottaviano3 0:8c8a8244e590 43 /**
ottaviano3 0:8c8a8244e590 44 * Send packet out on RF
ottaviano3 0:8c8a8244e590 45 */
ottaviano3 0:8c8a8244e590 46 void xbee900hp::sendPacket(char* data, unsigned int length)
ottaviano3 0:8c8a8244e590 47 {
ottaviano3 0:8c8a8244e590 48 // checksum
ottaviano3 0:8c8a8244e590 49 unsigned int checksum;
ottaviano3 0:8c8a8244e590 50 unsigned int checksumsub = 0;
ottaviano3 0:8c8a8244e590 51
ottaviano3 0:8c8a8244e590 52 // start char
ottaviano3 0:8c8a8244e590 53 _xbeespi.write(0x7E);
ottaviano3 0:8c8a8244e590 54 // lenght
ottaviano3 0:8c8a8244e590 55 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 56
ottaviano3 0:8c8a8244e590 57 unsigned int totallength = 14 + length - 1;
ottaviano3 0:8c8a8244e590 58 _xbeespi.write(totallength);
ottaviano3 0:8c8a8244e590 59
ottaviano3 0:8c8a8244e590 60 // frame delimter
ottaviano3 0:8c8a8244e590 61 _xbeespi.write(0x10);
ottaviano3 0:8c8a8244e590 62 checksumsub += 0x10;
ottaviano3 0:8c8a8244e590 63 // id for later reference 0 = no id
ottaviano3 0:8c8a8244e590 64 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 65
ottaviano3 0:8c8a8244e590 66 // destination address
ottaviano3 0:8c8a8244e590 67 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 68 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 69 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 70 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 71 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 72 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 73 _xbeespi.write(0xFF);
ottaviano3 0:8c8a8244e590 74 checksumsub += 0xFF;
ottaviano3 0:8c8a8244e590 75 _xbeespi.write(0xFF);
ottaviano3 0:8c8a8244e590 76 checksumsub += 0xFF;
ottaviano3 0:8c8a8244e590 77
ottaviano3 0:8c8a8244e590 78 // reserved field, dont change
ottaviano3 0:8c8a8244e590 79 _xbeespi.write(0xFF);
ottaviano3 0:8c8a8244e590 80 checksumsub += 0xFF;
ottaviano3 0:8c8a8244e590 81 _xbeespi.write(0xFE);
ottaviano3 0:8c8a8244e590 82 checksumsub += 0xFE;
ottaviano3 0:8c8a8244e590 83
ottaviano3 0:8c8a8244e590 84 //bcast radius
ottaviano3 0:8c8a8244e590 85 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 86
ottaviano3 0:8c8a8244e590 87 //transmit options 0x00 to disable ACK
ottaviano3 0:8c8a8244e590 88 _xbeespi.write(0x00);
ottaviano3 0:8c8a8244e590 89
ottaviano3 0:8c8a8244e590 90 // dat data
ottaviano3 0:8c8a8244e590 91 for (int i = 0; i < (length - 1); i++) {
ottaviano3 0:8c8a8244e590 92 _xbeespi.write(*data);
ottaviano3 0:8c8a8244e590 93 checksumsub += (*(data++));
ottaviano3 0:8c8a8244e590 94 }
ottaviano3 0:8c8a8244e590 95
ottaviano3 0:8c8a8244e590 96
ottaviano3 0:8c8a8244e590 97 // Calculate checksum
ottaviano3 0:8c8a8244e590 98 checksumsub = checksumsub & 0xFF;
ottaviano3 0:8c8a8244e590 99 checksum = 0xFF - checksumsub;
ottaviano3 0:8c8a8244e590 100
ottaviano3 0:8c8a8244e590 101 // finally write checksum
ottaviano3 0:8c8a8244e590 102 _xbeespi.write(checksum);
ottaviano3 0:8c8a8244e590 103 }