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Nascent support for OOK TPMS transponders.

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Apparently, Subaru and GMC. No CRC or other validation, no attempt to interpret packet contents yet.
This commit is contained in:
Jared Boone 2016-04-11 11:53:17 -07:00
parent dc16aa478f
commit e85503cd81
2 changed files with 47 additions and 2 deletions
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14
firmware/baseband/proc_tpms.cpp
View File

@ -21,8 +21,6 @@
#include "proc_tpms.hpp"
#include "portapack_shared_memory.hpp"
#include "dsp_fir_taps.hpp"
TPMSProcessor::TPMSProcessor() {
@ -45,6 +43,18 @@ void TPMSProcessor::execute(const buffer_c8_t& buffer) {
clock_recovery(mf.get_output());
}
}
for(size_t i=0; i<decim_1_out.count; i+=channel_decimation) {
const auto sliced = ook_slicer_5sps(decim_1_out.p[i]);
slicer_history = (slicer_history << 1) | sliced;
ook_clock_recovery_subaru(slicer_history, [this](const bool symbol) {
this->packet_builder_ook_subaru.execute(symbol);
});
ook_clock_recovery_gmc(slicer_history, [this](const bool symbol) {
this->packet_builder_ook_gmc.execute(symbol);
});
}
}
void TPMSProcessor::consume_symbol(

35
firmware/baseband/proc_tpms.hpp
View File

@ -32,7 +32,10 @@
#include "packet_builder.hpp"
#include "baseband_packet.hpp"
#include "ook.hpp"
#include "message.hpp"
#include "portapack_shared_memory.hpp"
#include <cstdint>
#include <cstddef>
@ -83,6 +86,38 @@ private:
}
};
static constexpr float channel_rate_in = 307200.0f;
static constexpr size_t channel_decimation = 8;
static constexpr float channel_sample_rate = channel_rate_in / channel_decimation;
OOKSlicerMagSquaredInt ook_slicer_5sps { 5 };
uint32_t slicer_history { 0 };
OOKClockRecovery ook_clock_recovery_subaru {
channel_sample_rate / 8192.0f
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_ook_subaru {
{ 0b010101010101010101011110, 24, 0 },
{ },
{ 80 },
[](const baseband::Packet& packet) {
const TPMSPacketMessage message { tpms::SignalType::Subaru, packet };
shared_memory.application_queue.push(message);
}
};
OOKClockRecovery ook_clock_recovery_gmc {
channel_sample_rate / 8400.0f
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_ook_gmc {
{ 0b01010101010101010101010101100101, 32, 0 },
{ },
{ 192 },
[](const baseband::Packet& packet) {
const TPMSPacketMessage message { tpms::SignalType::GMC, packet };
shared_memory.application_queue.push(message);
}
};
void consume_symbol(const float symbol);
void payload_handler(const baseband::Packet& packet);
};