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Minor cleanup

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This commit is contained in:
Peter Antypas 2020-12-27 08:01:44 -08:00
parent 69a4b83d54
commit f9d25888f3
3 changed files with 9 additions and 35 deletions
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2
latest/Firmware/Inc/bsp/bsp.hpp
View File

@ -27,7 +27,7 @@
// Either modify this header or define a different symbol in the preprocessor to build for a different board
#ifndef BOARD_REV
#define BOARD_REV 100
#define BOARD_REV 61
#endif
/**

5
latest/Firmware/Src/NoiseFloorDetector.cpp
View File

@ -22,6 +22,7 @@
#include "EventQueue.hpp"
#include "AISChannels.h"
#include <stdio.h>
#include <bsp/bsp.hpp>
#define WINDOW_SIZE 10
@ -46,7 +47,11 @@ NoiseFloorDetector::NoiseFloorDetector()
void NoiseFloorDetector::report(char channel, uint8_t rssi)
{
#if BOARD_REV == 61 or BOARD_REV == 52
if ( rssi < 0x12 ) // Not realistic, likely a bug
#else
if ( rssi < 0x32 ) // Not realistic, likely a bug
#endif
return;
if ( channel == 'A' )

37
latest/Firmware/Src/Receiver.cpp
View File

@ -73,7 +73,6 @@ void Receiver::switchToChannel(VHFChannel channel)
mNextChannel = channel;
}
// TODO: This is a really, really long operation - over 320us !!!
void Receiver::startListening(VHFChannel channel, bool reconfigGPIOs)
{
if ( reconfigGPIOs )
@ -94,9 +93,7 @@ void Receiver::startListening(VHFChannel channel, bool reconfigGPIOs)
/**
* This never takes more than 65us now :D
*/
//bsp_signal_high();
sendCmdNoWait(START_RX, &options, sizeof options);//, NULL, 0);
//bsp_signal_low();
sendCmdNoWait(START_RX, &options, sizeof options);
}
void Receiver::resetBitScanner()
@ -111,22 +108,14 @@ void Receiver::resetBitScanner()
mRXPacket->reset();
}
/*
* TODO: Under a worst case scenario, this interrupt service method
* can take up to 320us to complete (that's 4 clock bits!!!)
*
* Re-architecting will be necessary to resolve this.
*/
void Receiver::onBitClock()
{
//bsp_signal_high();
++mSlotBitNumber;
// Don't waste time processing bits when the transceiver is transmitting
if ( gRadioState == RADIO_TRANSMITTING )
{
//bsp_signal_low();
return;
}
@ -147,29 +136,10 @@ void Receiver::onBitClock()
{
startReceiving(mChannel, false);
}
#if ENABLE_TX
/**
* This trick ensures that we only sample RSSI every N time slots and never in the
* same time slot for both ICs, so we don't conduct long SPI operations on consecutive
* interrupt handlers that might exceed the bit clock period. There is no reason for RSSI
* collection to have a high duty cycle anyway, it just serves to establish the noise floor.
*/
#if FULL_RSSI_SAMPLING
else if ( mTimeSlot != 0xffffffff && mSlotBitNumber != 0xffff && mSlotBitNumber == CCA_SLOT_BIT )
{
mRXPacket->setRSSI(reportRSSI());
}
#else
else if ( mTimeSlot != 0xffffffff && mSlotBitNumber != 0xffff &&
mTimeSlot % 17 == mChipID &&
mSlotBitNumber == CCA_SLOT_BIT - 1 )
{
mRXPacket->setRSSI(reportRSSI());
}
#endif
#endif
//bsp_signal_low();
}
/**
@ -221,6 +191,7 @@ Receiver::Action Receiver::processNRZIBit(uint8_t bit)
* we gain enough confidence that this is not random noise.
*/
if ( mBitWindow == 0b1010101001111110 || mBitWindow == 0b0101010101111110 )
//if ( (mBitWindow & 0x0fff) == 0b101001111110 || (mBitWindow &0x0fff) == 0b010101111110 )
{
mBitState = BIT_STATE_IN_PACKET;
mRXPacket->setChannel(mChannel);
@ -230,7 +201,7 @@ Receiver::Action Receiver::processNRZIBit(uint8_t bit)
}
case BIT_STATE_IN_PACKET:
{
if ( mOneBitCount >= 7 || mRXPacket->size() >= MAX_AIS_RX_PACKET_SIZE )
if ( mOneBitCount >= 7 || mRXPacket->size() >= MAX_AIS_RX_PACKET_SIZE - 2 )
{
// Start over
return RESTART_RX;
@ -337,11 +308,9 @@ void Receiver::pushPacket()
*/
uint8_t Receiver::reportRSSI()
{
//bsp_signal_high();
uint8_t rssi = readRSSI();
char channel = AIS_CHANNELS[mChannel].designation;
NoiseFloorDetector::instance().report(channel, rssi);
//bsp_signal_low();
return rssi;
}