TouchGFX之调试

DebugPrinter类是一种在显示屏上打印调试消息的简单方法，无需向屏幕添加控件。

在使用DebugPrinter之前，需要分配一个实例并将其传递给Application类，且DebugPrinter实例必须兼容所使用的LCD类。该表列出了DebugPrinter类名称：

LCD 类	DebugPrinter类
LCD1bpp	LCD1DebugPrinter
LCD2bpp	LCD2DebugPrinter
LCD4bpp	LCD4DebugPrinter
LCD8bpp_ARGB2222	LCD8ARGB2222DebugPrinter
LCD8bpp_ABGR2222	LCD8ABGR2222DebugPrinter
LCD8bpp_RGBA2222	LCD8RGBA2222DebugPrinter
LCD8bpp_BGRA2222	LCD8BGRA2222DebugPrinter
LCD16bpp	LCD16DebugPrinter
LCD16bppSerialFlash	LCD16DebugPrinter
LCD24bpp	LCD24DebugPrinter
LCD32bpp	LCD32DebugPrinter

例如，这可以在FrontendApplication的构造函数中实现。

#include <gui/common/FrontendApplication.hpp>
#include <touchgfx/lcd/LCD16DebugPrinter.hpp>

LCD16DebugPrinter lcd16DebugPrinter;

FrontendApplication::FrontendApplication(Model& m, FrontendHeap& heap)
    : FrontendApplicationBase(m, heap)
{
  lcd16DebugPrinter.setPosition(0, 0, 240, 40);
  lcd16DebugPrinter.setScale(3);
  lcd16DebugPrinter.setColor(0x00); //black
  Application::setDebugPrinter(&lcd16DebugPrinter);
}

此时，我们已经将DebugPrinter配置为左上角240 x 40像素写入。现在可以编写程序打印字符串:

#ifndef SCREENVIEW_HPP
#define SCREENVIEW_HPP

#include <gui_generated/screen_screen/screenViewBase.hpp>
#include <gui/screen_screen/screenPresenter.hpp>

class screenView : public screenViewBase
{
public:
    screenView();
    virtual ~screenView() {}
    virtual void setupScreen();
    virtual void tearDownScreen();
		virtual void handleTickEvent();
protected:
	
private:
		int count;
		char debugStringBuffer[30];
};

#endif // SCREENVIEW_HPP

#include <gui/screen_screen/screenView.hpp>
#include <stdio.h>

screenView::screenView()
{
	count = 0;
}

void screenView::setupScreen()
{
    screenViewBase::setupScreen();
}

void screenView::tearDownScreen()
{
    screenViewBase::tearDownScreen();
}

void screenView::handleTickEvent()
{
  count++;
  snprintf(debugStringBuffer, sizeof(debugStringBuffer), "tick: %d", count);
	Application::getDebugPrinter()->setString(debugStringBuffer);
	Application::invalidateDebugRegion();	
}

其实不必在应用程序中多次调用DebugPrinter::setString。只需要更改缓存区的内容，但是请调用invalidateDebugRegion，这将使DebugPrinter绘制新内容。

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