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DIY-Multiprotocol-TX-Module/Multiprotocol/Binary_Signature.ino
Ben Lye 331da37840 Update Binary_Signature.ino (#278) 
Clean up the comments, add bitmasks.
2019-10-02 10:15:13 +02:00

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/*
This project is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Multiprotocol is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Multiprotocol. If not, see <http://www.gnu.org/licenses/>.
*/
/************************/
/** Firmware Signature **/
/************************/
/*
The firmware signature is appended to the compiled binary image in order to provide information
about the options used to compile the firmware file. This information is then used by Multi-module
flashing tools to verify that the image is correct / valid.
In order for the build process to determine the options used to build the firmware this file conditionally
declares 'flag' variables for the options we are interested in.
When the pre-compiler parses the source code these variables are either present or not in the parsed cpp file,
typically '$build_dir$/preproc/ctags_target_for_gcc_minus_e.cpp'.
Once the .bin file is created an additional command-line build tool scans the parsed cpp file, detects the
flags, assembles the signature, and finally appends the signature to the end of the binary file.
The signature is 24 bytes long:
multi-x[8-byte hex code]-[8-byte version number]
For example:
multi-x1234abcd-01020199
The 8-byte hex code is a 32-bit bitmask value indicating the configuration options, currently:
Bit(s) Bitmask Option Comment
1-2 0x3 Module type Read as a two-bit value indicating a number from 0-3 which maps to a module type (AVR, STM32, OrangeRX)
3-7 0x7C Channel order Read as a five-bit value indicating a number from 0-23 which maps to as channel order (AETR, TAER, RETA, etc) (right-shift two bits to read)
8 0x80 Bootloader support Indicates whether or not the firmware was built with support for the bootloader
9 0x100 CHECK_FOR_BOOTLOADER Indicates if CHECK_FOR_BOOTLOADER is defined
10 0x200 INVERT_TELEMETRY Indicates if INVERT_TELEMETRY is defined
11 0x400 MULTI_STATUS Indicates if MULTI_STATUS is defined
12 0x800 MULTI_TELEMETRY Indicates if MULTI_TELEMETRY is defined
13 0x1000 DEBUG_SERIAL Indicates if DEBUG_SERIAL is defined
The 8-byte version number is the version number zero-padded to a fixed width of two-bytes per segment and no separator.
E.g. 1.2.3.45 becomes 01020345.
Multi Telemetery Type can be read from bits 11 and 12 using the bitmask 0xC00 and right-shifting ten bits:
Telemetry Type Decimal Value Binary Value
Undefined 0 00
erSkyTX 1 01
OpenTX 2 10
Module types are mapped to the following decimal / binary values:
Module Type Decimal Value Binary Valsue
AVR 0 00
STM32 1 01
OrangeRX 2 10
Channel orders are mapped to the following decimal / binary values:
Channel Order Decimal Value Binary Value
AETR 0 00000
AERT 1 00001
ARET 2 00010
ARTE 3 00011
ATRE 4 00100
ATER 5 00101
EATR 6 00110
EART 7 00111
ERAT 8 01000
ERTA 9 01001
ETRA 10 01010
ETAR 11 01011
TEAR 12 01100
TERA 13 01101
TREA 14 01110
TRAE 15 01111
TARE 16 10000
TAER 17 10001
RETA 18 10010
REAT 19 10011
RAET 20 10100
RATE 21 10101
RTAE 22 10110
RTEA 23 10111
*/
// Set the flags for detecting and writing the firmware signature
#if defined (CHECK_FOR_BOOTLOADER)
bool firmwareFlag_CHECK_FOR_BOOTLOADER = true;
#endif
#if defined (INVERT_TELEMETRY)
bool firmwareFlag_INVERT_TELEMETRY = true;
#endif
#if defined (MULTI_STATUS)
bool firmwareFlag_MULTI_STATUS = true;
#endif
#if defined (MULTI_TELEMETRY)
bool firmwareFlag_MULTI_TELEMETRY = true;
#endif
#if defined (DEBUG_SERIAL)
bool firmwareFlag_DEBUG_SERIAL = true;
#endif
// Channel order flags
#if defined (AETR)
bool firmwareFlag_ChannelOrder_AETR = true;
#endif
#if defined (AERT)
bool firmwareFlag_ChannelOrder_AERT = true;
#endif
#if defined (ARET)
bool firmwareFlag_ChannelOrder_ARET = true;
#endif
#if defined (ARTE)
bool firmwareFlag_ChannelOrder_ARTE = true;
#endif
#if defined (ATRE)
bool firmwareFlag_ChannelOrder_ATRE = true;
#endif
#if defined (ATER)
bool firmwareFlag_ChannelOrder_ATER = true;
#endif
#if defined (EATR)
bool firmwareFlag_ChannelOrder_EATR = true;
#endif
#if defined (EART)
bool firmwareFlag_ChannelOrder_EART = true;
#endif
#if defined (ERAT)
bool firmwareFlag_ChannelOrder_ERAT = true;
#endif
#if defined (ERTA)
bool firmwareFlag_ChannelOrder_ERTA = true;
#endif
#if defined (ETRA)
bool firmwareFlag_ChannelOrder_ETRA = true;
#endif
#if defined (ETAR)
bool firmwareFlag_ChannelOrder_ETAR = true;
#endif
#if defined (TEAR)
bool firmwareFlag_ChannelOrder_TEAR = true;
#endif
#if defined (TERA)
bool firmwareFlag_ChannelOrder_TERA = true;
#endif
#if defined (TREA)
bool firmwareFlag_ChannelOrder_TREA = true;
#endif
#if defined (TRAE)
bool firmwareFlag_ChannelOrder_TRAE = true;
#endif
#if defined (TARE)
bool firmwareFlag_ChannelOrder_TARE = true;
#endif
#if defined (TAER)
bool firmwareFlag_ChannelOrder_TAER = true;
#endif
#if defined (RETA)
bool firmwareFlag_ChannelOrder_RETA = true;
#endif
#if defined (REAT)
bool firmwareFlag_ChannelOrder_REAT = true;
#endif
#if defined (RAET)
bool firmwareFlag_ChannelOrder_RAET = true;
#endif
#if defined (RATE)
bool firmwareFlag_ChannelOrder_RATE = true;
#endif
#if defined (RTAE)
bool firmwareFlag_ChannelOrder_RTAE = true;
#endif
#if defined (RTEA)
bool firmwareFlag_ChannelOrder_RTEA = true;
#endif
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