本帖最后由 xld0932 于 2022-7-2 19:46 编辑
概述 CW32F030CxTx StartKit开发板板载了三个按键，一个是用于复位芯片的RESET按键，另外两个是可用户自定义的编程按键，通过原理图知道KEY1/KEY2分别与PA1/PA2相连接，本文将结合开源的MultiButton软件库现实现这两个按键的多态功能；为了能够实时监测/查看按键状态，我们还配置了USART串口实现了printf的功能，当然为了后面的调试方便，基于USART还移植了Letter-shell_3.x软件库，为后面调试、或者是发送shell命令调用软件代码功能先做好准备，当前本文先讲述一下移植，具体应用到后面使用的时候再详细描述。
MultiButton MultiButton是一个小巧装简单易用的事件驱动型按键驱动模块，使用C语言实现，它是基于面向对象方式设计思路实现的，每个按键对象都会单独使用一份数据结构来管理，所以MultiButton可以无限量的扩展按键，其按键事件的回调异步处理方式可以简化程序结构，去除了冗余的按键处理硬编码，让按键业务逻辑更清晰。详情可以参考如下链接：https://github.com/0x1abin/MultiButton
MultiButton包含了7种类型的按键事件，如下所示：
MultiButton的使用方法也很简单，下面将一步步来进行讲解…… struct Button button1 - 初始化按键对象，此时需要绑定这个按键的GPIO端口引脚电平读取接口函数read_pin_level()，后面两个参数是按键有效触发的电平值和按键ID号，这个ID号必须是唯一值，不能重复哦
button_init(&button1, read_pin_level, 0, 1) - 注册按键事件，用户可以根据应用功能的需要对相应的按键注册一个或者多个事件，然后在回调函数里面实现用户按键的具体功能
button_attach(&button1, SINGLE_CLICK, BTN_SingleClickHandler) button_attach(&button1, DOUBLE_CLICK, BTN_DoubleClickHandler) button_start(&button1) - 设置一个循环调用后台的处理函数，我们使用上一节讲到的MultiTimer来实现这个功能，调用button_ticks()函数即可。
MultiButton实现代码 - MultiTimer KEY_MultiTimer;
- struct Button KEY1;
- struct Button KEY2;
- uint8_t key1_pin_level(void)
- {
- return GPIO_ReadPin(CW_GPIOA, GPIO_PIN_1);
- }
- uint8_t key2_pin_level(void)
- {
- return GPIO_ReadPin(CW_GPIOA, GPIO_PIN_2);
- }
- void KEY_PressDownHandler(void *btn)
- {
- Button *key = btn;
- switch(key->button_id)
- {
- case 1 : printf("\r\nKEY1 : Press Down"); break;
- case 2 : printf("\r\nKEY2 : Press Down"); break;
- default: break;
- }
- }
- void KEY_PressUpHandler(void *btn)
- {
- Button *key = btn;
- switch(key->button_id)
- {
- case 1 : printf("\r\nKEY1 : Press Up"); break;
- case 2 : printf("\r\nKEY2 : Press Up"); break;
- default: break;
- }
- }
- void KEY_PressRepeatHandler(void *btn)
- {
- Button *key = btn;
- switch(key->button_id)
- {
- case 1 : printf("\r\nKEY1 : Press Repeat"); break;
- case 2 : printf("\r\nKEY2 : Press Repeat"); break;
- default: break;
- }
- }
- void KEY_SingleClickHandler(void *btn)
- {
- Button *key = btn;
- switch(key->button_id)
- {
- case 1 : printf("\r\nKEY1 : Single Click"); break;
- case 2 : printf("\r\nKEY2 : Single Click"); break;
- default: break;
- }
- }
- void KEY_DoubleClickHandler(void *btn)
- {
- Button *key = btn;
- switch(key->button_id)
- {
- case 1 : printf("\r\nKEY1 : Double Click"); break;
- case 2 : printf("\r\nKEY2 : Double Click"); break;
- default: break;
- }
- }
- void KEY_LongPressStartHandler(void *btn)
- {
- Button *key = btn;
- switch(key->button_id)
- {
- case 1 : printf("\r\nKEY1 : Long Press Start"); break;
- case 2 : printf("\r\nKEY2 : Long Press Start"); break;
- default: break;
- }
- }
- void KEY_LongPressHoldHandler(void *btn)
- {
- Button *key = btn;
- switch(key->button_id)
- {
- case 1 : printf("\r\nKEY1 : Long Press Hold"); break;
- case 2 : printf("\r\nKEY2 : Long Press Hold"); break;
- default: break;
- }
- }
- void KEY_Init(void)
- {
- GPIO_InitTypeDef GPIO_InitStruct;
- __RCC_GPIOA_CLK_ENABLE();
- GPIO_InitStruct.Pins = GPIO_PIN_1 | GPIO_PIN_2;
- GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
- GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
- GPIO_InitStruct.IT = GPIO_IT_NONE;
- GPIO_Init(CW_GPIOA, &GPIO_InitStruct);
- button_init(&KEY1, key1_pin_level, GPIO_Pin_RESET, 1);
- button_init(&KEY2, key2_pin_level, GPIO_Pin_RESET, 2);
- button_attach(&KEY1, PRESS_DOWN, KEY_PressDownHandler);
- button_attach(&KEY1, PRESS_UP, KEY_PressUpHandler);
- button_attach(&KEY1, PRESS_REPEAT, KEY_PressRepeatHandler);
- button_attach(&KEY1, SINGLE_CLICK, KEY_SingleClickHandler);
- button_attach(&KEY1, DOUBLE_CLICK, KEY_DoubleClickHandler);
- button_attach(&KEY1, LONG_PRESS_START, KEY_LongPressStartHandler);
- button_attach(&KEY1, LONG_PRESS_HOLD, KEY_LongPressHoldHandler);
- button_attach(&KEY2, SINGLE_CLICK, KEY_SingleClickHandler);
- button_start(&KEY1);
- button_start(&KEY2);
- MultiTimerStart(&KEY_MultiTimer, 5, KEY_MultiTimerCallback, "KEY Scan");
- }
- void KEY_MultiTimerCallback(MultiTimer *timer, void *userData)
- {
- button_ticks();
- MultiTimerStart(&KEY_MultiTimer, 5, KEY_MultiTimerCallback, "KEY Scan");
- }
运行结果
Letter-shell_3.x Letter-shell是一个用C语言来编写的，可以嵌入在程序中的嵌入式shell，主要面向嵌入式设备，以C语言函数为运行单位，可以通过命令行调用，运行程序中的函数。其实从早期的2.x版本就已经开发开使用了，相比于其它shell来说操作更为方便，增加shell指令的方式也更为灵活；在CW32芯片上是首次基于USART来移植Letter-shell_3.x的版本，相对于功能而言，新版本增加了用户管理、权限管理、以及对文件系统的初步支持；但对于移植来说，最大的体会就是修改了读写函数的原型，提升了效率；还有就是在Letter-shell_3.x版本上需要申请一片缓冲区，其它的与Letter-shell_2.x的移植大体一致，详情可以参考如下链接：https://github.com/NevermindZZT/letter-shell，费话不多说，直接上代码： - Shell shell;
- char shellBuffer[512];
- signed short shellPortRead(char *data, unsigned short len)
- {
- return len;
- }
- signed short shellPortWrite(char *data, unsigned short len)
- {
- for(unsigned short i = 0; i < len; i++)
- {
- USART_SendData_8bit(CW_UART1, *data++);
- while(USART_GetFlagStatus(CW_UART1, USART_FLAG_TXE) == RESET);
- }
- while(USART_GetFlagStatus(CW_UART1, USART_FLAG_TXBUSY) != RESET);
- return len;
- }
- void shellPortInit(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
- RCC_AHBPeriphClk_Enable(RCC_AHB_PERIPH_GPIOA, ENABLE);
- RCC_APBPeriphClk_Enable2(RCC_APB2_PERIPH_UART1, ENABLE);
- PA08_AFx_UART1TXD();
- PA09_AFx_UART1RXD();
- GPIO_InitStructure.Pins = GPIO_PIN_8;
- GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
- GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
- GPIO_Init(CW_GPIOA, &GPIO_InitStructure);
- GPIO_InitStructure.Pins = GPIO_PIN_9;
- GPIO_InitStructure.Mode = GPIO_MODE_INPUT_PULLUP;
- GPIO_Init(CW_GPIOA, &GPIO_InitStructure);
- USART_InitStructure.USART_BaudRate = 115200;
- USART_InitStructure.USART_Over = USART_Over_16;
- USART_InitStructure.USART_Source = USART_Source_PCLK;
- USART_InitStructure.USART_UclkFreq = 64000000;
- USART_InitStructure.USART_StartBit = USART_StartBit_FE;
- USART_InitStructure.USART_StopBits = USART_StopBits_1;
- USART_InitStructure.USART_Parity = USART_Parity_No ;
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
- USART_Init(CW_UART1, &USART_InitStructure);
- NVIC_SetPriority(UART1_IRQn, 0);
- NVIC_EnableIRQ(UART1_IRQn);
- USART_ITConfig(CW_UART1, USART_IT_RC, ENABLE);
- shell.read = shellPortRead;
- shell.write = shellPortWrite;
- shellInit(&shell, shellBuffer, sizeof(shellBuffer));
- }
- void shellPortHandler(void)
- {
- if(USART_GetITStatus(CW_UART1, USART_IT_RC) != RESET)
- {
- shellHandler(&shell, USART_ReceiveData_8bit(CW_UART1));
- USART_ClearITPendingBit(CW_UART1, USART_IT_RC);
- }
- }
- int fputc(int ch, FILE *f)
- {
- USART_SendData_8bit(CW_UART1, (uint8_t)ch);
- while(USART_GetFlagStatus(CW_UART1, USART_FLAG_TXE) == RESET);
- while(USART_GetFlagStatus(CW_UART1, USART_FLAG_TXBUSY) == SET);
- return ch;
- }
运行结果
工程源码
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