Git-Mirrors/portapack-mayhem
1
0
Fork 0
mirror of https://github.com/eried/portapack-mayhem.git synced 2025-07-29 17:49:14 -04:00
Code Issues Projects Releases Packages Wiki Activity

Rework BitHistory, BitPattern, PacketBuilder.

Browse source 
Templatize PacketBuilder to optionally bit unstuff, and have flexible packet termination behavior.
This commit is contained in:
Jared Boone 2015-11-09 14:38:09 -08:00
parent 0b522abbc1
commit 0789d50fdf
5 changed files with 59 additions and 69 deletions
Download patch file Download diff file Expand all files Collapse all files

52
firmware/baseband/packet_builder.hpp
View file

@ -29,21 +29,33 @@
#include "bit_pattern.hpp"
template<typename PreambleMatcher, typename UnstuffMatcher, typename EndMatcher>
class PacketBuilder {
public:
using PayloadType = std::bitset<1024>;
using PayloadHandlerFunc = std::function<void(const PayloadType& payload, const size_t bits_received)>;
PacketBuilder(
const PreambleMatcher preamble_matcher,
const UnstuffMatcher unstuff_matcher,
const EndMatcher end_matcher,
const PayloadHandlerFunc payload_handler
) : payload_handler { payload_handler }
) : payload_handler { payload_handler },
preamble(preamble_matcher),
unstuff(unstuff_matcher),
end(end_matcher)
{
}
void configure(
const BitPattern preamble,
const BitPattern unstuffing
);
const PreambleMatcher preamble_matcher,
const UnstuffMatcher unstuff_matcher
) {
preamble = preamble_matcher;
unstuff = unstuff_matcher;
reset_state();
}
void execute(
const uint_fast8_t symbol
@ -52,25 +64,24 @@ public:
switch(state) {
case State::Preamble:
if( found_preamble() ) {
if( preamble(bit_history, bits_received) ) {
state = State::Payload;
}
break;
case State::Payload:
if( !found_stuffing_bit() ) {
if( !unstuff(bit_history, bits_received) ) {
payload[bits_received++] = symbol;
}
if( found_end_flag() ) {
payload_handler(payload, bits_received - 7);
if( end(bit_history, bits_received) ) {
payload_handler(payload, bits_received);
reset_state();
} else {
if( packet_truncated() ) {
reset_state();
}
}
break;
default:
@ -89,30 +100,21 @@ private:
return bits_received >= payload.size();
}
bool found_preamble() const {
return bit_history.matches(preamble_pattern);
}
bool found_stuffing_bit() const {
return bit_history.matches(unstuff_pattern);
}
bool found_end_flag() const {
return bit_history.matches(end_flag_pattern);
}
const PayloadHandlerFunc payload_handler;
BitHistory bit_history;
BitPattern preamble_pattern { 0b0101010101111110, 16, 1 };
BitPattern unstuff_pattern { 0b111110, 6 };
BitPattern end_flag_pattern { 0b01111110, 8 };
PreambleMatcher preamble;
UnstuffMatcher unstuff;
EndMatcher end;
size_t bits_received { 0 };
State state { State::Preamble };
PayloadType payload;
void reset_state();
void reset_state() {
bits_received = 0;
state = State::Preamble;
}
};
#endif/*__PACKET_BUILDER_H__*/