touchGFX综合学习七、touchGFX使用实体按键（正点原子H750开发版）

一、touchGFX工程搭建

1、touchGFX界面搭建

放置一个box作为背景，使用实体按键更改背景颜色。

2、touchGFX interactions添加

红色框内填写的是实体按键返回值哦。

二、代码修改

1、实现按键初始化和扫描函数

按键返回值要和touchgfx designer interactions里面设置的一样哦，
我的工程返回值为：

#define KEY0_PRES   '0'   //KEY0���º󷵻�ֵ
#define KEY1_PRES '1' //KEY1���º󷵻�ֵ
#define KEY2_PRES '2' //KEY2���º󷵻�ֵ
#define WKUP_PRES   '3' //WKUP���º󷵻�ֵ

key.c

#include "key.h"
#include "delay.h"

//?????????????
void key_init(void)
{
    GPIO_InitTypeDef GPIO_Initure;

    __HAL_RCC_GPIOA_CLK_ENABLE();           //????GPIOA???
    __HAL_RCC_GPIOC_CLK_ENABLE();           //????GPIOC???
    __HAL_RCC_GPIOH_CLK_ENABLE();           //????GPIOH???

    GPIO_Initure.Pin=GPIO_PIN_0;            //PA0
    GPIO_Initure.Mode=GPIO_MODE_INPUT;      //????
    GPIO_Initure.Pull=GPIO_PULLDOWN;        //????
    GPIO_Initure.Speed=GPIO_SPEED_FREQ_VERY_HIGH;     //????
    HAL_GPIO_Init(GPIOA,&GPIO_Initure);
    
    GPIO_Initure.Pin=GPIO_PIN_13;           //PC13
    GPIO_Initure.Mode=GPIO_MODE_INPUT;      //????
    GPIO_Initure.Pull=GPIO_PULLUP;          //????
    GPIO_Initure.Speed=GPIO_SPEED_FREQ_VERY_HIGH;     //????
    HAL_GPIO_Init(GPIOC,&GPIO_Initure);
    
    GPIO_Initure.Pin=GPIO_PIN_2|GPIO_PIN_3; //PH2,3
    HAL_GPIO_Init(GPIOH,&GPIO_Initure);
}

//????????????
//????????
//mode:0,???????????;1,?????????;
//0??????κ????????
//1??WKUP???? WK_UP
//?????????????????,KEY0>KEY1>KEY2>WK_UP!!
u8 key_scan(u8 mode)
{
    static u8 key_up=1;     //??????????
    if(mode==1)key_up=1;    //???????
    if(key_up&&(KEY0==0||KEY1==0||KEY2==0||WK_UP==1))
    {
        key_up=0;
        if(KEY0==0)       return KEY0_PRES;
        else if(KEY1==0)  return KEY1_PRES;
        else if(KEY2==0)  return KEY2_PRES;
        else if(WK_UP==1) return WKUP_PRES;          
    }else if(KEY0==1&&KEY1==1&&KEY2==1&&WK_UP==0)key_up=1;
    return 0;   //?????????
}

key.h

#ifndef _KEY_H
#define _KEY_H
#include "sys.h"
#ifdef __cplusplus
extern "C"
{
#endif

#define KEY0        HAL_GPIO_ReadPin(GPIOH,GPIO_PIN_3)  //KEY0����PH3
#define KEY1        HAL_GPIO_ReadPin(GPIOH,GPIO_PIN_2)  //KEY1����PH2
#define KEY2        HAL_GPIO_ReadPin(GPIOC,GPIO_PIN_13) //KEY2����PC13
#define WK_UP       HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0)  //WKUP����PA0

#define KEY0_PRES   '0'   //KEY0���º󷵻�ֵ
#define KEY1_PRES '1' //KEY1���º󷵻�ֵ
#define KEY2_PRES '2' //KEY2���º󷵻�ֵ
#define WKUP_PRES   '3' //WKUP���º󷵻�ֵ

void key_init(void);  //����IO��ʼ������
u8 key_scan(u8 mode); //����ɨ�躯��

#ifdef __cplusplus
}
#endif
#endif

2、添加一个KeyController类

KeyController类要继承ButtonController类。在ButtonController中有两个纯虚函数，子类必须实现

KeyController.hpp

#ifndef _KEYCONTROLLER_T_
#define _KEYCONTROLLER_T_


#include <platform/driver/button/ButtonController.hpp>


namespace touchgfx
{
class KeyController : public ButtonController
{
public:
  KeyController();
  virtual ~KeyController();
  
  virtual void init();
  virtual bool sample(uint8_t& key);    
  
};
}
#endif

KeyController.cpp

#include "KeyController.hpp"
#include "key.h"

using namespace touchgfx;

KeyController::KeyController()
{
  
}
KeyController::~KeyController()
{
  
}
    
void KeyController::init()
{
  key_init();
}
bool KeyController::sample(uint8_t& key)
{
  uint8_t keyValue = key_scan(0);
  if(keyValue !=0)
  {
    key = keyValue;
    
    return true;
  }
  
  return false;
}

3、将新添加的类赋值为系统

打开​​TouchGFXHAL.cpp​​​文件新建一个​​KeyController​​对象

static touchgfx::KeyController keyController;

然后在​​void TouchGFXHAL::initialize()​​里面这个对象赋值给系统，记得调用初始化函数

keyController.init();
  setButtonController(&keyController);

#include <TouchGFXHAL.hpp>
#include <KeyController.hpp>

static touchgfx::KeyController keyController;
/* USER CODE BEGIN TouchGFXHAL.cpp */

using namespace touchgfx;

void TouchGFXHAL::initialize()
{
    // Calling parent implementation of initialize().
    //
    // To overwrite the generated implementation, omit call to parent function
    // and implemented needed functionality here.
    // Please note, HAL::initialize() must be called to initialize the framework.

    TouchGFXGeneratedHAL::initialize();
    
    uint32_t frameSize = DISPLAY_HEIGHT*DISPLAY_WIDTH*3;
    setFrameBufferStartAddresses((void *)(0xC0000000),(void *)(0xC0000000+frameSize),(void *)(0xC0000000+frameSize*2));
    setFrameRateCompensation(true);
    
    keyController.init();
    setButtonController(&keyController);
}