TheArchive/mayhem-firmware
1
0
Fork 0
mirror of https://github.com/portapack-mayhem/mayhem-firmware.git synced 2025-08-23 22:38:13 +00:00
Code Issues Packages Projects Releases Wiki Activity

Transmit ChannelSpectrum data through separate FIFO.

Browse Source 
Allows handling of data during LCD "vertical retrace", independent of other baseband->application messages. A bit kludgy still...
This commit is contained in:
Jared Boone
2016-01-06 11:34:41 -08:00
parent 2cd28fcc0c
commit aaa1bc3a09
4 changed files with 37 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
firmware/baseband/spectrum_collector.cpp
View File

@@ -73,8 +73,8 @@ void SpectrumCollector::update() {
channel_spectrum_request_update = false;
fft_c_preswapped(channel_spectrum);
ChannelSpectrumMessage spectrum_message;
for(size_t i=0; i<spectrum_message.spectrum.db.size(); i++) {
ChannelSpectrum spectrum;
for(size_t i=0; i<spectrum.db.size(); i++) {
// Three point Hamming window.
const auto corrected_sample = channel_spectrum[i] * 0.54f
+ (channel_spectrum[(i-1) & 0xff] + channel_spectrum[(i+1) & 0xff]) * -0.23f;
@@ -82,14 +82,16 @@ void SpectrumCollector::update() {
const float db = complex16_mag_squared_to_dbv_norm(mag2);
constexpr float mag_scale = 5.0f;
const unsigned int v = (db * mag_scale) + 255.0f;
spectrum_message.spectrum.db[i] = std::max(0U, std::min(255U, v));
spectrum.db[i] = std::max(0U, std::min(255U, v));
}
/* TODO: Rename .db -> .magnitude, or something more (less!) accurate. */
spectrum_message.spectrum.db_count = spectrum_message.spectrum.db.size();
spectrum_message.spectrum.sampling_rate = channel_spectrum_sampling_rate;
spectrum_message.spectrum.channel_filter_pass_frequency = channel_filter_pass_frequency;
spectrum_message.spectrum.channel_filter_stop_frequency = channel_filter_stop_frequency;
shared_memory.application_queue.push(spectrum_message);
spectrum.db_count = spectrum.db.size();
spectrum.sampling_rate = channel_spectrum_sampling_rate;
spectrum.channel_filter_pass_frequency = channel_filter_pass_frequency;
spectrum.channel_filter_stop_frequency = channel_filter_stop_frequency;
fifo.in(spectrum);
FIFONotifyMessage message { &fifo };
shared_memory.application_queue.push(message);
}
}

3
firmware/baseband/spectrum_collector.hpp
View File

@@ -30,6 +30,8 @@
#include <cstdint>
#include <array>
#include "message.hpp"
class SpectrumCollector {
public:
constexpr SpectrumCollector(
@@ -49,6 +51,7 @@ public:
private:
BlockDecimator<256> channel_spectrum_decimator;
ChannelSpectrumFIFO fifo;
volatile bool channel_spectrum_request_update { false };
std::array<std::complex<float>, 256> channel_spectrum;