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led-matrix.cc
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led-matrix.cc
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// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
// Copyright (C) 2013 Henner Zeller <h.zeller@acm.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation version 2.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://gnu.org/licenses/gpl-2.0.txt>
#include "led-matrix.h"
#include <assert.h>
#include <math.h>
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <stdio.h>
#include <sys/time.h>
#include "gpio.h"
#include "thread.h"
#include "framebuffer-internal.h"
// Leave this in here for a while. Setting things from old defines.
#if defined(ADAFRUIT_RGBMATRIX_HAT)
# warning "You are using an old way to select the Adafruit HAT by defining -DADAFRUIT_RGBMATRIX_HAT"
# warning "The new way to do this is to set HARDWARE_DESC=adafruit-hat"
# warning "Check out https://github.com/hzeller/rpi-rgb-led-matrix#switch-the-pinout"
# undef DEFAULT_HARDWARE
# define DEFAULT_HARDWARE "adafruit-hat"
#endif
#if defined(ADAFRUIT_RGBMATRIX_HAT_PWM)
# warning "You are using an old way to select the Adafruit HAT with flicker mod by defining -DADAFRUIT_RGBMATRIX_HAT_PWM"
# warning "The new way to do this is to set HARDWARE_DESC=adafruit-hat-pwm"
# undef DEFAULT_HARDWARE
# define DEFAULT_HARDWARE "adafruit-hat-pwm"
#endif
namespace rgb_matrix {
// Pump pixels to screen. Needs to be high priority real-time because jitter
class RGBMatrix::UpdateThread : public Thread {
public:
UpdateThread(GPIO *io, FrameCanvas *initial_frame, bool show_refresh)
: io_(io), show_refresh_(show_refresh), running_(true),
current_frame_(initial_frame), next_frame_(NULL),
requested_frame_multiple_(1) {
pthread_cond_init(&frame_done_, NULL);
}
void Stop() {
MutexLock l(&running_mutex_);
running_ = false;
}
virtual void Run() {
unsigned frame_count = 0;
while (running()) {
struct timeval start, end;
if (show_refresh_) {
gettimeofday(&start, NULL);
}
current_frame_->framebuffer()->DumpToMatrix(io_);
{
MutexLock l(&frame_sync_);
// Do fast equality test first (likely due to frame_count reset).
if (frame_count == requested_frame_multiple_
|| frame_count % requested_frame_multiple_ == 0) {
// We reset to avoid frame hick-up every couple of weeks
// run-time iff requested_frame_multiple_ is not a factor of 2^32.
frame_count = 0;
if (next_frame_ != NULL) {
current_frame_ = next_frame_;
next_frame_ = NULL;
}
pthread_cond_signal(&frame_done_);
}
}
++frame_count;
if (show_refresh_) {
gettimeofday(&end, NULL);
int64_t usec = ((uint64_t)end.tv_sec * 1000000 + end.tv_usec)
- ((int64_t)start.tv_sec * 1000000 + start.tv_usec);
printf("\b\b\b\b\b\b\b\b%6.1fHz", 1e6 / usec);
}
}
}
FrameCanvas *SwapOnVSync(FrameCanvas *other, unsigned frame_fraction) {
MutexLock l(&frame_sync_);
FrameCanvas *previous = current_frame_;
next_frame_ = other;
requested_frame_multiple_ = frame_fraction;
frame_sync_.WaitOn(&frame_done_);
return previous;
}
private:
inline bool running() {
MutexLock l(&running_mutex_);
return running_;
}
GPIO *const io_;
const bool show_refresh_;
Mutex running_mutex_;
bool running_;
Mutex frame_sync_;
pthread_cond_t frame_done_;
FrameCanvas *current_frame_;
FrameCanvas *next_frame_;
unsigned requested_frame_multiple_;
};
// Some defaults. See options-initialize.cc for the command line parsing.
RGBMatrix::Options::Options() :
// Historically, we provided these options only as #defines. Make sure that
// things still behave as before if someone has set these.
// At some point: remove them from the Makefile. Later: remove them here.
#ifdef DEFAULT_HARDWARE
hardware_mapping(DEFAULT_HARDWARE),
#else
hardware_mapping("regular"),
#endif
rows(32), chain_length(1), parallel(1), pwm_bits(11),
#ifdef LSB_PWM_NANOSECONDS
pwm_lsb_nanoseconds(LSB_PWM_NANOSECONDS),
#else
pwm_lsb_nanoseconds(130),
#endif
brightness(100),
#ifdef RGB_SCAN_INTERLACED
scan_mode(1),
#else
scan_mode(0),
#endif
#ifdef DISABLE_HARDWARE_PULSES
disable_hardware_pulsing(true),
#else
disable_hardware_pulsing(false),
#endif
#ifdef SHOW_REFRESH_RATE
show_refresh_rate(true),
#else
show_refresh_rate(false),
#endif
#ifdef INVERSE_RGB_DISPLAY_COLORS
inverse_colors(true),
#else
inverse_colors(false),
#endif
led_rgb_sequence("RGB"),
row_address_type(0)
{
// Nothing to see here.
}
RGBMatrix::RGBMatrix(GPIO *io, const Options &options)
: params_(options), io_(NULL), updater_(NULL), shared_pixel_mapper_(NULL) {
assert(params_.Validate(NULL));
internal::Framebuffer::InitHardwareMapping(params_.hardware_mapping);
active_ = CreateFrameCanvas();
Clear();
SetGPIO(io, true);
// ApplyStaticTransformer(...); // TODO: add 1:8 multiplex for outdoor panels
}
RGBMatrix::RGBMatrix(GPIO *io, int rows, int chained_displays,
int parallel_displays)
: params_(Options()), io_(NULL), updater_(NULL), shared_pixel_mapper_(NULL) {
params_.rows = rows;
params_.chain_length = chained_displays;
params_.parallel = parallel_displays;
assert(params_.Validate(NULL));
internal::Framebuffer::InitHardwareMapping(params_.hardware_mapping);
active_ = CreateFrameCanvas();
Clear();
SetGPIO(io, true);
// ApplyStaticTransformer(...); // TODO: add 1:8 multiplex for outdoor panels
}
RGBMatrix::~RGBMatrix() {
updater_->Stop();
updater_->WaitStopped();
delete updater_;
// Make sure LEDs are off.
active_->Clear();
active_->framebuffer()->DumpToMatrix(io_);
for (size_t i = 0; i < created_frames_.size(); ++i) {
delete created_frames_[i];
}
delete shared_pixel_mapper_;
}
void RGBMatrix::SetGPIO(GPIO *io, bool start_thread) {
if (io != NULL && io_ == NULL) {
io_ = io;
internal::Framebuffer::InitGPIO(io_, params_.rows, params_.parallel,
!params_.disable_hardware_pulsing,
params_.pwm_lsb_nanoseconds,
params_.row_address_type);
}
if (start_thread) {
StartRefresh();
}
}
bool RGBMatrix::StartRefresh() {
if (updater_ == NULL && io_ != NULL) {
updater_ = new UpdateThread(io_, active_, params_.show_refresh_rate);
// If we have multiple processors, the kernel
// jumps around between these, creating some global flicker.
// So let's tie it to the last CPU available.
// The Raspberry Pi2 has 4 cores, our attempt to bind it to
// core #3 will succeed.
// The Raspberry Pi1 only has one core, so this affinity
// call will simply fail and we keep using the only core.
updater_->Start(99, (1<<3)); // Prio: high. Also: put on last CPU.
}
return updater_ != NULL;
}
FrameCanvas *RGBMatrix::CreateFrameCanvas() {
FrameCanvas *result =
new FrameCanvas(new internal::Framebuffer(params_.rows,
32 * params_.chain_length,
params_.parallel,
params_.scan_mode,
params_.led_rgb_sequence,
params_.inverse_colors,
&shared_pixel_mapper_));
if (created_frames_.empty()) {
// First time. Get defaults from initial Framebuffer.
do_luminance_correct_ = result->framebuffer()->luminance_correct();
}
result->framebuffer()->SetPWMBits(params_.pwm_bits);
result->framebuffer()->set_luminance_correct(do_luminance_correct_);
result->framebuffer()->SetBrightness(params_.brightness);
created_frames_.push_back(result);
return result;
}
FrameCanvas *RGBMatrix::SwapOnVSync(FrameCanvas *other,
unsigned frame_fraction) {
if (frame_fraction == 0) frame_fraction = 1; // correct user error.
FrameCanvas *const previous = updater_->SwapOnVSync(other, frame_fraction);
if (other) active_ = other;
return previous;
}
bool RGBMatrix::SetPWMBits(uint8_t value) {
const bool success = active_->framebuffer()->SetPWMBits(value);
if (success) {
params_.pwm_bits = value;
}
return success;
}
uint8_t RGBMatrix::pwmbits() { return params_.pwm_bits; }
// Map brightness of output linearly to input with CIE1931 profile.
void RGBMatrix::set_luminance_correct(bool on) {
active_->framebuffer()->set_luminance_correct(on);
do_luminance_correct_ = on;
}
bool RGBMatrix::luminance_correct() const {
return do_luminance_correct_;
}
void RGBMatrix::SetBrightness(uint8_t brightness) {
active_->framebuffer()->SetBrightness(brightness);
params_.brightness = brightness;
}
uint8_t RGBMatrix::brightness() {
return params_.brightness;
}
// -- Implementation of RGBMatrix Canvas: delegation to ContentBuffer
int RGBMatrix::width() const {
return active_->width();
}
int RGBMatrix::height() const {
return active_->height();
}
void RGBMatrix::SetPixel(int x, int y, uint8_t red, uint8_t green, uint8_t blue) {
active_->SetPixel(x, y, red, green, blue);
}
void RGBMatrix::Clear() {
active_->Clear();
}
void RGBMatrix::Fill(uint8_t red, uint8_t green, uint8_t blue) {
active_->Fill(red, green, blue);
}
namespace {
// A pixel mapper
class PixelMapExtractionCanvas : public Canvas {
public:
PixelMapExtractionCanvas(internal::PixelMapper *old_mapper)
: old_mapper_(old_mapper), new_mapper_(NULL) {}
virtual int width() const { return old_mapper_->width(); }
virtual int height() const { return old_mapper_->height(); }
void SetNewMapper(internal::PixelMapper *new_mapper) {
new_mapper_ = new_mapper;
}
void SetNewLocation(int x, int y) {
x_new = x;
y_new = y;
}
virtual void SetPixel(int x, int y, uint8_t r, uint8_t g, uint8_t b) {
const internal::PixelDesignator *orig_designator = old_mapper_->get(x, y);
if (orig_designator && new_mapper_) {
// Tell the new mapper at the new location what after the mapping was
// at the old location.
*new_mapper_->get(x_new, y_new) = *orig_designator;
}
}
virtual void Clear() {}
virtual void Fill(uint8_t red, uint8_t green, uint8_t blue) {}
private:
internal::PixelMapper *const old_mapper_;
internal::PixelMapper *new_mapper_;
int x_new, y_new;
};
} // anonymous namespace
void RGBMatrix::ApplyStaticTransformer(const CanvasTransformer &transformer) {
using internal::PixelMapper;
assert(shared_pixel_mapper_); // Not initialized yet ?
PixelMapExtractionCanvas extractor_canvas(shared_pixel_mapper_);
// These transformers traditionally only a non-const Transform()
// method, so that they can modify an instance variable keeping the delegate.
//
// We can't really change that now as we want to be backwards compatible.
//
// Having a const-reference as parameter to ApplyStaticTransformer() however
// is somewhat neat, so that it is possible to pass ad-hoc instances to
// ApplyStaticTransformer() (which are discarded after that all anyway).
//
// So we're slightly naughty here and cast the const away.
CanvasTransformer *non_const_transformer
= const_cast<CanvasTransformer*>(&transformer);
Canvas *mapped_canvas = non_const_transformer->Transform(&extractor_canvas);
const int new_width = mapped_canvas->width();
const int new_height = mapped_canvas->height();
PixelMapper *new_mapper = new PixelMapper(new_width, new_height);
extractor_canvas.SetNewMapper(new_mapper);
// Learn about the pixel mapping by going through all transformed pixels and
// build new PixelDesignator map.
for (int y = 0; y < new_height; ++y) {
for (int x = 0; x < new_width; ++x) {
extractor_canvas.SetNewLocation(x, y);
mapped_canvas->SetPixel(x, y, 0, 0, 0); // force copy of designator.
}
}
delete shared_pixel_mapper_;
shared_pixel_mapper_ = new_mapper;
}
// FrameCanvas implementation of Canvas
FrameCanvas::~FrameCanvas() { delete frame_; }
int FrameCanvas::width() const { return frame_->width(); }
int FrameCanvas::height() const { return frame_->height(); }
void FrameCanvas::SetPixel(int x, int y,
uint8_t red, uint8_t green, uint8_t blue) {
frame_->SetPixel(x, y, red, green, blue);
}
void FrameCanvas::Clear() { return frame_->Clear(); }
void FrameCanvas::Fill(uint8_t red, uint8_t green, uint8_t blue) {
frame_->Fill(red, green, blue);
}
bool FrameCanvas::SetPWMBits(uint8_t value) { return frame_->SetPWMBits(value); }
uint8_t FrameCanvas::pwmbits() { return frame_->pwmbits(); }
// Map brightness of output linearly to input with CIE1931 profile.
void FrameCanvas::set_luminance_correct(bool on) { frame_->set_luminance_correct(on); }
bool FrameCanvas::luminance_correct() const { return frame_->luminance_correct(); }
void FrameCanvas::SetBrightness(uint8_t brightness) { frame_->SetBrightness(brightness); }
uint8_t FrameCanvas::brightness() { return frame_->brightness(); }
void FrameCanvas::Serialize(const char **data, size_t *len) const {
frame_->Serialize(data, len);
}
bool FrameCanvas::Deserialize(const char *data, size_t len) {
return frame_->Deserialize(data, len);
}
void FrameCanvas::CopyFrom(const FrameCanvas &other) {
frame_->CopyFrom(other.frame_);
}
} // end namespace rgb_matrix