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); //blackApplication::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。