Point Labs / RadioHeadLite

This driver is a stripped down version of the Radiohead 1.45 driver, and covers fewer radios. Threading and an event queue have been added to make the ISR's more stable across architectures. Specifically The STM32L4 parts

Dependents:   Threaded_LoRa_Modem

RHCRC.cpp@0:ab4e012489ef, 2015-10-15 (annotated)

Committer:
davidr99
Date:
Thu Oct 15 01:27:00 2015 +0000
Revision:
0:ab4e012489ef
Messy start, but a port for RadioHead.; Currently the SPI modulus are the only ones that work.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
davidr99 0:ab4e012489ef 1 /* Copyright (c) 2002, 2003, 2004 Marek Michalkiewicz
davidr99 0:ab4e012489ef 2 Copyright (c) 2005, 2007 Joerg Wunsch
davidr99 0:ab4e012489ef 3 All rights reserved.
davidr99 0:ab4e012489ef 4
davidr99 0:ab4e012489ef 5 Redistribution and use in source and binary forms, with or without
davidr99 0:ab4e012489ef 6 modification, are permitted provided that the following conditions are met:
davidr99 0:ab4e012489ef 7
davidr99 0:ab4e012489ef 8 * Redistributions of source code must retain the above copyright
davidr99 0:ab4e012489ef 9 notice, this list of conditions and the following disclaimer.
davidr99 0:ab4e012489ef 10
davidr99 0:ab4e012489ef 11 * Redistributions in binary form must reproduce the above copyright
davidr99 0:ab4e012489ef 12 notice, this list of conditions and the following disclaimer in
davidr99 0:ab4e012489ef 13 the documentation and/or other materials provided with the
davidr99 0:ab4e012489ef 14 distribution.
davidr99 0:ab4e012489ef 15
davidr99 0:ab4e012489ef 16 * Neither the name of the copyright holders nor the names of
davidr99 0:ab4e012489ef 17 contributors may be used to endorse or promote products derived
davidr99 0:ab4e012489ef 18 from this software without specific prior written permission.
davidr99 0:ab4e012489ef 19
davidr99 0:ab4e012489ef 20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
davidr99 0:ab4e012489ef 21 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
davidr99 0:ab4e012489ef 22 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
davidr99 0:ab4e012489ef 23 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
davidr99 0:ab4e012489ef 24 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
davidr99 0:ab4e012489ef 25 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
davidr99 0:ab4e012489ef 26 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
davidr99 0:ab4e012489ef 27 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
davidr99 0:ab4e012489ef 28 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
davidr99 0:ab4e012489ef 29 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
davidr99 0:ab4e012489ef 30 POSSIBILITY OF SUCH DAMAGE. */
davidr99 0:ab4e012489ef 31
davidr99 0:ab4e012489ef 32 // Port to Energia / MPS430 by Yannick DEVOS XV4Y - (c) 2013
davidr99 0:ab4e012489ef 33 // http://xv4y.radioclub.asia/
davidr99 0:ab4e012489ef 34 //
davidr99 0:ab4e012489ef 35
davidr99 0:ab4e012489ef 36 // Adapted to RadioHead use by Mike McCauley 2014
davidr99 0:ab4e012489ef 37 // This is to prevent name collisions with other similar library functions
davidr99 0:ab4e012489ef 38 // and to provide a consistent API amonng all processors
davidr99 0:ab4e012489ef 39 //
davidr99 0:ab4e012489ef 40
davidr99 0:ab4e012489ef 41 /* $Id: RHCRC.cpp,v 1.1 2014/06/24 02:40:12 mikem Exp $ */
davidr99 0:ab4e012489ef 42
davidr99 0:ab4e012489ef 43 #include <RHCRC.h>
davidr99 0:ab4e012489ef 44
davidr99 0:ab4e012489ef 45 #define lo8(x) ((x)&0xff)
davidr99 0:ab4e012489ef 46 #define hi8(x) ((x)>>8)
davidr99 0:ab4e012489ef 47
davidr99 0:ab4e012489ef 48 uint16_t RHcrc16_update(uint16_t crc, uint8_t a)
davidr99 0:ab4e012489ef 49 {
davidr99 0:ab4e012489ef 50 int i;
davidr99 0:ab4e012489ef 51
davidr99 0:ab4e012489ef 52 crc ^= a;
davidr99 0:ab4e012489ef 53 for (i = 0; i < 8; ++i)
davidr99 0:ab4e012489ef 54 {
davidr99 0:ab4e012489ef 55 if (crc & 1)
davidr99 0:ab4e012489ef 56 crc = (crc >> 1) ^ 0xA001;
davidr99 0:ab4e012489ef 57 else
davidr99 0:ab4e012489ef 58 crc = (crc >> 1);
davidr99 0:ab4e012489ef 59 }
davidr99 0:ab4e012489ef 60 return crc;
davidr99 0:ab4e012489ef 61 }
davidr99 0:ab4e012489ef 62
davidr99 0:ab4e012489ef 63 uint16_t RHcrc_xmodem_update (uint16_t crc, uint8_t data)
davidr99 0:ab4e012489ef 64 {
davidr99 0:ab4e012489ef 65 int i;
davidr99 0:ab4e012489ef 66
davidr99 0:ab4e012489ef 67 crc = crc ^ ((uint16_t)data << 8);
davidr99 0:ab4e012489ef 68 for (i=0; i<8; i++)
davidr99 0:ab4e012489ef 69 {
davidr99 0:ab4e012489ef 70 if (crc & 0x8000)
davidr99 0:ab4e012489ef 71 crc = (crc << 1) ^ 0x1021;
davidr99 0:ab4e012489ef 72 else
davidr99 0:ab4e012489ef 73 crc <<= 1;
davidr99 0:ab4e012489ef 74 }
davidr99 0:ab4e012489ef 75
davidr99 0:ab4e012489ef 76 return crc;
davidr99 0:ab4e012489ef 77 }
davidr99 0:ab4e012489ef 78
davidr99 0:ab4e012489ef 79 uint16_t RHcrc_ccitt_update (uint16_t crc, uint8_t data)
davidr99 0:ab4e012489ef 80 {
davidr99 0:ab4e012489ef 81 data ^= lo8 (crc);
davidr99 0:ab4e012489ef 82 data ^= data << 4;
davidr99 0:ab4e012489ef 83
davidr99 0:ab4e012489ef 84 return ((((uint16_t)data << 8) | hi8 (crc)) ^ (uint8_t)(data >> 4)
davidr99 0:ab4e012489ef 85 ^ ((uint16_t)data << 3));
davidr99 0:ab4e012489ef 86 }
davidr99 0:ab4e012489ef 87
davidr99 0:ab4e012489ef 88 uint8_t RHcrc_ibutton_update(uint8_t crc, uint8_t data)
davidr99 0:ab4e012489ef 89 {
davidr99 0:ab4e012489ef 90 uint8_t i;
davidr99 0:ab4e012489ef 91
davidr99 0:ab4e012489ef 92 crc = crc ^ data;
davidr99 0:ab4e012489ef 93 for (i = 0; i < 8; i++)
davidr99 0:ab4e012489ef 94 {
davidr99 0:ab4e012489ef 95 if (crc & 0x01)
davidr99 0:ab4e012489ef 96 crc = (crc >> 1) ^ 0x8C;
davidr99 0:ab4e012489ef 97 else
davidr99 0:ab4e012489ef 98 crc >>= 1;
davidr99 0:ab4e012489ef 99 }
davidr99 0:ab4e012489ef 100
davidr99 0:ab4e012489ef 101 return crc;
davidr99 0:ab4e012489ef 102 }
davidr99 0:ab4e012489ef 103
davidr99 0:ab4e012489ef 104