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Add TPMS initial demodulator implementation.

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Right now, 2FSK, 19200 baud, +/-38400Hz deviation. No effort is made to check CRC/checksums or decode packets.
This commit is contained in:
Jared Boone 2015-11-10 15:19:56 -08:00
parent 6cdef7026d
commit 9f6c495fef
7 changed files with 227 additions and 0 deletions
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34
firmware/application/ui_receiver.cpp
View file

@ -503,10 +503,17 @@ void ReceiverView::on_show() {
this->on_packet_ais(*message);
}
);
message_map.register_handler(Message::ID::TPMSPacket,
[this](Message* const p) {
const auto message = static_cast<const TPMSPacketMessage*>(p);
this->on_packet_tpms(*message);
}
);
}
void ReceiverView::on_hide() {
auto& message_map = context().message_map();
message_map.unregister_handler(Message::ID::TPMSPacket);
message_map.unregister_handler(Message::ID::AISPacket);
}
@ -519,6 +526,31 @@ void ReceiverView::on_packet_ais(const AISPacketMessage& message) {
}
}
void ReceiverView::on_packet_tpms(const TPMSPacketMessage& message) {
auto payload = message.packet.payload;
auto payload_length = message.packet.bits_received;
for(size_t i=0; i<payload_length; i+=2) {
if( payload[i+0] != payload[i+1] ) {
payload[i>>1] = payload[i+1];
} else {
payload[i>>1] = 0;
}
}
std::string hex;
uint8_t c = 0;
for(size_t i=0; i<15*8; i++) {
c = (c << 1) | payload[i];
if( (i & 7) == 7 ) {
hex += to_string_hex(c, 2);
}
}
auto console = reinterpret_cast<Console*>(widget_content.get());
console->writeln(hex);
}
void ReceiverView::focus() {
button_done.focus();
}
@ -547,6 +579,7 @@ void ReceiverView::on_modulation_changed(int32_t modulation) {
/* TODO: This is TERRIBLE!!! */
switch(modulation) {
case 3:
case 5:
receiver_model.set_baseband_configuration({
.mode = modulation,
.sampling_rate = 2457600,
@ -579,6 +612,7 @@ void ReceiverView::on_modulation_changed(int32_t modulation) {
switch(modulation) {
case 3:
case 5:
widget_content = std::make_unique<Console>();
add_child(widget_content.get());
break;