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【每周分享】STM32F103核心板+HX1838实现红外遥控电脑

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yuyy1989|  楼主 | 2024-11-7 17:48 | 只看该作者 |只看大图 回帖奖励 |倒序浏览 |阅读模式
ST, STM32, 红外遥控, hx1838
#申请原创# #技术资源# @21小跑堂  红外遥控是利用红外光进行通信的设备，由红外LED将调制后的信号发出，由专用的红外接收头进行解调输出。红外线的波长在可见光范围外，所以人眼是看不到的。在生活中电视机空调等设备都可以用红外遥控器来控制，正好手里有个HX1838红外接收器和遥控器，想着也给电脑做个红外遥控。
用到的设备：HX1838红外接收器，红外遥控，引出USB的STM32F103核心板

基本原理就是用STM32F103核心板模拟USB键盘，解析HX1838收到的红外信号后转为按键命令发送给电脑
先来实现对红外信号的解析，要解析红外信号就要用到红外接收器，红外接收器是一种能够接收红外光信号并将其转换为电信号的元件。红外接收器会对接收到的红外光信号进行解析，以还原出原始的指令或数据。红外接收头通常被集成在一个元件中，内部包含光敏二极管等关键部件，以及用于信号放大、解调等功能的电路。这里用到的HX1838模块是可接收标准38KHz调制的遥控器信号，通过对进行编程，即可实现对遥控器信号的解码操作。
这套遥控套件使用的是NEC编码，关于NEC编码的介绍可以看这篇帖子 【每周分享】红外遥控中常用的NEC编码https://bbs.21ic.com/icview-3409956-1-1.html
HX1838模块接收到38KHz的红外PWM信号时输出低电平，否则输出高电平，这点和NEC编码中相反，编程时需要注意，程序通过高低电平的时间来解析红外数据。
配套遥控器的按键码

先根据NEC编码规则写出解析红外信号的代码
复制
enum

{

    IR_CODE_STEP_IDLE = 0,

    IR_CODE_STEP_START,

    IR_CODE_STEP_DATA,

    IR_CODE_STEP_STOP,

};

enum

{

    IR_CODE_FLAG_NONE = 0,

    IR_CODE_FLAG_CMD,

    IR_CODE_FLAG_REPEAT,

};

#define MAX_TIME_DIFF 60

uint32_t IR_time_us = 0;

uint32_t IR_H_time_us = 0;

uint32_t IR_L_time_us = 0;

uint8_t IR_code[4];

uint8_t IR_code_index = 0;

uint8_t IR_code_bit = 0;

uint8_t IR_code_step = IR_CODE_STEP_IDLE;

uint8_t IR_lev_last = 0;

uint8_t IR_code_flag = IR_CODE_FLAG_NONE;



uint8_t IRIsTimeInRange(uint32_t time,uint32_t targettime,uint32_t diff)

{

    if(time < targettime && targettime - time > diff)

        return 0;

    if(time > targettime && time - targettime > diff)

        return 0;

    return 1;

}

void IRTimeCount(uint32_t us)

{

    IR_time_us += us;

}

void IRDataProc(void)

{

    switch(IR_code_step)

    {

        case IR_CODE_STEP_IDLE:

            if(IRIsTimeInRange(IR_H_time_us,9000,MAX_TIME_DIFF) != 0)

            {

                IR_code_step = IR_CODE_STEP_START;

                IR_code_flag = IR_CODE_FLAG_NONE;

            }

            break;

        case IR_CODE_STEP_START:

            if(IRIsTimeInRange(IR_L_time_us,4500,MAX_TIME_DIFF) != 0)

            {

                //开始指令

                memset(IR_code,0,4);

                IR_code_index = 0;

                IR_code_bit = 0;

                IR_code_step = IR_CODE_STEP_DATA;

            }

            else if(IRIsTimeInRange(IR_L_time_us,2250,MAX_TIME_DIFF) != 0)

            {

                //重复指令

                IR_code_step = IR_CODE_STEP_STOP;

                IR_code_flag = IR_CODE_FLAG_REPEAT;

            }

            else

            {

                IR_code_step = IR_CODE_STEP_IDLE;

                IR_code_flag = IR_CODE_FLAG_NONE;

            }

            break;

        case IR_CODE_STEP_DATA:

            if(IRIsTimeInRange(IR_H_time_us,560,MAX_TIME_DIFF) != 0)

            {

                if(IRIsTimeInRange(IR_L_time_us,1690,MAX_TIME_DIFF) != 0)

                {

                    IR_code[IR_code_index] |= (1<<IR_code_bit);

                }

                else if(IRIsTimeInRange(IR_L_time_us,560,MAX_TIME_DIFF) == 0)

                {

                    IR_code_step = IR_CODE_STEP_IDLE;

                    IR_code_flag = IR_CODE_FLAG_NONE;

                }

                IR_code_bit += 1;

                if(IR_code_bit == 8)

                {

                    IR_code_bit = 0;

                    IR_code_index += 1;

                    if(IR_code_index == 4)

                    {

                        IR_code_step = IR_CODE_STEP_STOP;

                        IR_code_flag = IR_CODE_FLAG_CMD;

                    }

                }

            }

            else

            {

                IR_code_step = IR_CODE_STEP_IDLE;

                IR_code_flag = IR_CODE_FLAG_NONE;

            }

            break;

        case IR_CODE_STEP_STOP:

            if(IRIsTimeInRange(IR_H_time_us,560,MAX_TIME_DIFF) != 0)

            {

                //结束指令

                IR_code_step = IR_CODE_STEP_IDLE;

            }

            else

            {

                IR_code_step = IR_CODE_STEP_IDLE;

                IR_code_flag = IR_CODE_FLAG_NONE;

            }

            break;

        default:

            IR_code_step = IR_CODE_STEP_IDLE;

            break;

    }

}

void IRIOcheck(uint8_t lev)

{

    if(lev != IR_lev_last)

    {

        IR_lev_last = lev;

        if(lev == 0)

        {

            IR_H_time_us = IR_time_us;

            if(IR_code_step == IR_CODE_STEP_IDLE || IR_code_step == IR_CODE_STEP_STOP)

            {

                IRDataProc();

            }

        }

        else

        {

            if(IR_code_step == IR_CODE_STEP_IDLE)

            {

                IR_L_time_us = 0;

            }

            else

            {

                IR_L_time_us = IR_time_us;

                IRDataProc();

            }

        }

        IR_time_us = 0;

    }

}
通过STM32CubeMX配置一个定时器用来对高低电平进行计时，为了避免太过频繁的进入中断，这里配置的周期是20us

在定时器中断函数里调用IRTimeCount传入参数为定时器触发的周期
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void TIM4_IRQHandler(void)

{

  /* USER CODE BEGIN TIM4_IRQn 0 */

    if(LL_TIM_IsActiveFlag_UPDATE(TIM4) == SET)

    {

        LL_TIM_ClearFlag_UPDATE(TIM4);

        IRTimeCount(20);

    }

  /* USER CODE END TIM4_IRQn 0 */

  /* USER CODE BEGIN TIM4_IRQn 1 */



  /* USER CODE END TIM4_IRQn 1 */

}
配置检测红外信号的引脚，我这里使用的是PB9开启了双边沿中断

触发中断后检测PB9的电平，需要注意的是要做取反处理
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uint8_t ir_pin_it_flag = 0;

void EXTI9_5_IRQHandler(void)

{

  /* USER CODE BEGIN EXTI9_5_IRQn 0 */



  /* USER CODE END EXTI9_5_IRQn 0 */

  if (LL_EXTI_IsActiveFlag_0_31(LL_EXTI_LINE_9) != RESET)

  {

    LL_EXTI_ClearFlag_0_31(LL_EXTI_LINE_9);

    /* USER CODE BEGIN LL_EXTI_LINE_9 */

        ir_pin_it_flag = 1;

    /* USER CODE END LL_EXTI_LINE_9 */

  }

  /* USER CODE BEGIN EXTI9_5_IRQn 1 */



  /* USER CODE END EXTI9_5_IRQn 1 */

}

void IRAPP(void)

{

    if(ir_pin_it_flag != 0)

    {

        ir_pin_it_flag = 0;

        IRIOcheck(!LL_GPIO_IsInputPinSet(IR_PIN_GPIO_Port,IR_PIN_Pin));

    }

}

如果不用中断就直接轮询PB9的状态
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void IRAPP(void)

{

    IRIOcheck(!LL_GPIO_IsInputPinSet(IR_PIN_GPIO_Port,IR_PIN_Pin));

}

在主循环中调用IRAPP()，检测到正确的红外控制命令后IR_code_flag会被置位，先通过串口打印看看效果
复制
if(IR_code_flag == IR_CODE_FLAG_CMD)

{

        printf("rev ir data: %02X%02X%02X%02X\r\n",IR_code[0],IR_code[1],IR_code[2],IR_code[3]);

        IR_code_flag = IR_CODE_FLAG_NONE;

}

else if(IR_code_flag == IR_CODE_FLAG_REPEAT)

{

        printf("rev ir repeat\r\n");

}



接下来实现用STM32F103模拟键盘，在STM32CubeMX中开启USBDevice

选择HID

生成的代码默认设备类型是鼠标，找个键盘的描述符替换掉usbd_hid.c中的鼠标描述符
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//#define HID_MOUSE_REPORT_DESC_SIZE    74U

#define HID_MOUSE_REPORT_DESC_SIZE    63U

/*修改usbd_hid.c中的报告设备描述符*/

__ALIGN_BEGIN static uint8_t HID_MOUSE_ReportDesc[HID_MOUSE_REPORT_DESC_SIZE] __ALIGN_END =

{

        0x05, 0x01, // USAGE_PAGE (Generic Desktop) //63

        0x09, 0x06, // USAGE (Keyboard)

        0xa1, 0x01, // COLLECTION (Application)

        0x05, 0x07, // USAGE_PAGE (Keyboard)

        0x19, 0xe0, // USAGE_MINIMUM (Keyboard LeftControl)

        0x29, 0xe7, // USAGE_MAXIMUM (Keyboard Right GUI)

        0x15, 0x00, // LOGICAL_MINIMUM (0)

        0x25, 0x01, // LOGICAL_MAXIMUM (1)

        0x75, 0x01, // REPORT_SIZE (1)

        0x95, 0x08, // REPORT_COUNT (8)

        0x81, 0x02, // INPUT (Data,Var,Abs)

        0x95, 0x01, // REPORT_COUNT (1)

        0x75, 0x08, // REPORT_SIZE (8)

        0x81, 0x03, // INPUT (Cnst,Var,Abs)

        0x95, 0x05, // REPORT_COUNT (5)

        0x75, 0x01, // REPORT_SIZE (1)

        0x05, 0x08, // USAGE_PAGE (LEDs)

        0x19, 0x01, // USAGE_MINIMUM (Num Lock)

        0x29, 0x05, // USAGE_MAXIMUM (Kana)

        0x91, 0x02, // OUTPUT (Data,Var,Abs)

        0x95, 0x01, // REPORT_COUNT (1)

        0x75, 0x03, // REPORT_SIZE (3)

        0x91, 0x03, // OUTPUT (Cnst,Var,Abs)

        0x95, 0x06, // REPORT_COUNT (6)

        0x75, 0x08, // REPORT_SIZE (8)

        0x15, 0x00, // LOGICAL_MINIMUM (0)

        0x25, 0x65, // LOGICAL_MAXIMUM (101)

        0x05, 0x07, // USAGE_PAGE (Keyboard)

        0x19, 0x00, // USAGE_MINIMUM (Reserved (no event indicated))

        0x29, 0x65, // USAGE_MAXIMUM (Keyboard Application)

        0x81, 0x00, // INPUT (Data,Ary,Abs)

        0xc0,       // END_COLLECTION

};

文件中USBD_HID_OtherSpeedCfgDesc这两处也改掉

看一下键盘HID消息格式

找一份键盘值映射代码
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typedef enum

{

    KEYBOARD_NONE = 0,

    KEYBOARD_ERROR_ROLL_OVER,

    KEYBOARD_POST_FAIL,

    KEYBOARD_ERROR_UNDEFINED,

    KEYBOARD_A,

    KEYBOARD_B,

    KEYBOARD_C,

    KEYBOARD_D,

    KEYBOARD_E,

    KEYBOARD_F,

    KEYBOARD_G,

    KEYBOARD_H,

    KEYBOARD_I,

    KEYBOARD_J,

    KEYBOARD_K,

    KEYBOARD_L,

    KEYBOARD_M,

    KEYBOARD_N,

    KEYBOARD_O,

    KEYBOARD_P,

    KEYBOARD_Q,

    KEYBOARD_R,

    KEYBOARD_S,

    KEYBOARD_T,

    KEYBOARD_U,

    KEYBOARD_V,

    KEYBOARD_W,

    KEYBOARD_X,

    KEYBOARD_Y,

    KEYBOARD_Z,

    KEYBOARD_1_EXCLAMATION,

    KEYBOARD_2_AT,

    KEYBOARD_3_NUMBER_SIGN,

    KEYBOARD_4_DOLLAR,

    KEYBOARD_5_PERCENT,

    KEYBOARD_6_CARET,

    KEYBOARD_7_AMPERSAND,

    KEYBOARD_8_ASTERISK,

    KEYBOARD_9_OPARENTHESIS,

    KEYBOARD_0_CPARENTHESIS,

    KEYBOARD_ENTER,

    KEYBOARD_ESCAPE,

    KEYBOARD_BACKSPACE,

    KEYBOARD_TAB,

    KEYBOARD_SPACEBAR,

    KEYBOARD_MINUS_UNDERSCORE,

    KEYBOARD_EQUAL_PLUS,

    KEYBOARD_OBRACKET_AND_OBRACE,

    KEYBOARD_CBRACKET_AND_CBRACE,

    KEYBOARD_BACKSLASH_VERTICAL_BAR,

    KEYBOARD_NONUS_NUMBER_SIGN_TILDE,

    KEYBOARD_SEMICOLON_COLON,

    KEYBOARD_SINGLE_AND_DOUBLE_QUOTE,

    KEYBOARD_GRAVE_ACCENT_AND_TILDE,

    KEYBOARD_COMMA_AND_LESS,

    KEYBOARD_DOT_GREATER,

    KEYBOARD_SLASH_QUESTION,

    KEYBOARD_CAPS_LOCK,

    KEYBOARD_F1,

    KEYBOARD_F2,

    KEYBOARD_F3,

    KEYBOARD_F4,

    KEYBOARD_F5,

    KEYBOARD_F6,

    KEYBOARD_F7,

    KEYBOARD_F8,

    KEYBOARD_F9,

    KEYBOARD_F10,

    KEYBOARD_F11,

    KEYBOARD_F12,

    KEYBOARD_PRINTSCREEN,

    KEYBOARD_SCROLL_LOCK,

    KEYBOARD_PAUSE,

    KEYBOARD_INSERT,

    KEYBOARD_HOME,

    KEYBOARD_PAGEUP,

    KEYBOARD_DELETE,

    KEYBOARD_END1,

    KEYBOARD_PAGEDOWN,

    KEYBOARD_RIGHTARROW,

    KEYBOARD_LEFTARROW,

    KEYBOARD_DOWNARROW,

    KEYBOARD_UPARROW,

    KEYBOARD_KEYBOARDPAD_NUM_LOCK_AND_CLEAR,

    KEYBOARD_KEYBOARDPAD_SLASH,

    KEYBOARD_KEYBOARDPAD_ASTERIKS,

    KEYBOARD_KEYBOARDPAD_MINUS,

    KEYBOARD_KEYBOARDPAD_PLUS,

    KEYBOARD_KEYBOARDPAD_ENTER,

    KEYBOARD_KEYBOARDPAD_1_END,

    KEYBOARD_KEYBOARDPAD_2_DOWN_ARROW,

    KEYBOARD_KEYBOARDPAD_3_PAGEDN,

    KEYBOARD_KEYBOARDPAD_4_LEFT_ARROW,

    KEYBOARD_KEYBOARDPAD_5,

    KEYBOARD_KEYBOARDPAD_6_RIGHT_ARROW,

    KEYBOARD_KEYBOARDPAD_7_HOME,

    KEYBOARD_KEYBOARDPAD_8_UP_ARROW,

    KEYBOARD_KEYBOARDPAD_9_PAGEUP,

    KEYBOARD_KEYBOARDPAD_0_INSERT,

    KEYBOARD_KEYBOARDPAD_DECIMAL_SEPARATOR_DELETE,

    KEYBOARD_NONUS_BACK_SLASH_VERTICAL_BAR,

    KEYBOARD_APPLICATION,

    KEYBOARD_POWER,

    KEYBOARD_KEYBOARDPAD_EQUAL,

    KEYBOARD_F13,

    KEYBOARD_F14,

    KEYBOARD_F15,

    KEYBOARD_F16,

    KEYBOARD_F17,

    KEYBOARD_F18,

    KEYBOARD_F19,

    KEYBOARD_F20,

    KEYBOARD_F21,

    KEYBOARD_F22,

    KEYBOARD_F23,

    KEYBOARD_F24,

    KEYBOARD_EXECUTE,

    KEYBOARD_HELP,

    KEYBOARD_MENU,

    KEYBOARD_SELECT,

    KEYBOARD_STOP,

    KEYBOARD_AGAIN,

    KEYBOARD_UNDO,

    KEYBOARD_CUT,

    KEYBOARD_COPY,

    KEYBOARD_PASTE,

    KEYBOARD_FIND,

    KEYBOARD_MUTE,

    KEYBOARD_VOLUME_UP,

    KEYBOARD_VOLUME_DOWN,

    KEYBOARD_LOCKING_CAPS_LOCK,

    KEYBOARD_LOCKING_NUM_LOCK,

    KEYBOARD_LOCKING_SCROLL_LOCK,

    KEYBOARD_KEYBOARDPAD_COMMA,

    KEYBOARD_KEYBOARDPAD_EQUAL_SIGN,

    KEYBOARD_INTERNATIONAL1,

    KEYBOARD_INTERNATIONAL2,

    KEYBOARD_INTERNATIONAL3,

    KEYBOARD_INTERNATIONAL4,

    KEYBOARD_INTERNATIONAL5,

    KEYBOARD_INTERNATIONAL6,

    KEYBOARD_INTERNATIONAL7,

    KEYBOARD_INTERNATIONAL8,

    KEYBOARD_INTERNATIONAL9,

    KEYBOARD_LANG1,

    KEYBOARD_LANG2,

    KEYBOARD_LANG3,

    KEYBOARD_LANG4,

    KEYBOARD_LANG5,

    KEYBOARD_LANG6,

    KEYBOARD_LANG7,

    KEYBOARD_LANG8,

    KEYBOARD_LANG9,

    KEYBOARD_ALTERNATE_ERASE,

    KEYBOARD_SYSREQ,

    KEYBOARD_CANCEL,

    KEYBOARD_CLEAR,

    KEYBOARD_PRIOR,

    KEYBOARD_RETURN,

    KEYBOARD_SEPARATOR,

    KEYBOARD_OUT,

    KEYBOARD_OPER,

    KEYBOARD_CLEAR_AGAIN,

    KEYBOARD_CRSEL,

    KEYBOARD_EXSEL,

    KEYBOARD_RESERVED1,

    KEYBOARD_RESERVED2,

    KEYBOARD_RESERVED3,

    KEYBOARD_RESERVED4,

    KEYBOARD_RESERVED5,

    KEYBOARD_RESERVED6,

    KEYBOARD_RESERVED7,

    KEYBOARD_RESERVED8,

    KEYBOARD_RESERVED9,

    KEYBOARD_RESERVED10,

    KEYBOARD_RESERVED11,

    KEYBOARD_KEYBOARDPAD_00,

    KEYBOARD_KEYBOARDPAD_000,

    KEYBOARD_THOUSANDS_SEPARATOR,

    KEYBOARD_DECIMAL_SEPARATOR,

    KEYBOARD_CURRENCY_UNIT,

    KEYBOARD_CURRENCY_SUB_UNIT,

    KEYBOARD_KEYBOARDPAD_OPARENTHESIS,

    KEYBOARD_KEYBOARDPAD_CPARENTHESIS,

    KEYBOARD_KEYBOARDPAD_OBRACE,

    KEYBOARD_KEYBOARDPAD_CBRACE,

    KEYBOARD_KEYBOARDPAD_TAB,

    KEYBOARD_KEYBOARDPAD_BACKSPACE,

    KEYBOARD_KEYBOARDPAD_A,

    KEYBOARD_KEYBOARDPAD_B,

    KEYBOARD_KEYBOARDPAD_C,

    KEYBOARD_KEYBOARDPAD_D,

    KEYBOARD_KEYBOARDPAD_E,

    KEYBOARD_KEYBOARDPAD_F,

    KEYBOARD_KEYBOARDPAD_XOR,

    KEYBOARD_KEYBOARDPAD_CARET,

    KEYBOARD_KEYBOARDPAD_PERCENT,

    KEYBOARD_KEYBOARDPAD_LESS,

    KEYBOARD_KEYBOARDPAD_GREATER,

    KEYBOARD_KEYBOARDPAD_AMPERSAND,

    KEYBOARD_KEYBOARDPAD_LOGICAL_AND,

    KEYBOARD_KEYBOARDPAD_VERTICAL_BAR,

    KEYBOARD_KEYBOARDPAD_LOGIACL_OR,

    KEYBOARD_KEYBOARDPAD_COLON,

    KEYBOARD_KEYBOARDPAD_NUMBER_SIGN,

    KEYBOARD_KEYBOARDPAD_SPACE,

    KEYBOARD_KEYBOARDPAD_AT,

    KEYBOARD_KEYBOARDPAD_EXCLAMATION_MARK,

    KEYBOARD_KEYBOARDPAD_MEMORY_STORE,

    KEYBOARD_KEYBOARDPAD_MEMORY_RECALL,

    KEYBOARD_KEYBOARDPAD_MEMORY_CLEAR,

    KEYBOARD_KEYBOARDPAD_MEMORY_ADD,

    KEYBOARD_KEYBOARDPAD_MEMORY_SUBTRACT,

    KEYBOARD_KEYBOARDPAD_MEMORY_MULTIPLY,

    KEYBOARD_KEYBOARDPAD_MEMORY_DIVIDE,

    KEYBOARD_KEYBOARDPAD_PLUSMINUS,

    KEYBOARD_KEYBOARDPAD_CLEAR,

    KEYBOARD_KEYBOARDPAD_CLEAR_ENTRY,

    KEYBOARD_KEYBOARDPAD_BINARY,

    KEYBOARD_KEYBOARDPAD_OCTAL,

    KEYBOARD_KEYBOARDPAD_DECIMAL,

    KEYBOARD_KEYBOARDPAD_HEXADECIMAL,

    KEYBOARD_RESERVED12,

    KEYBOARD_RESERVED13,

    KEYBOARD_LEFTCONTROL,

    KEYBOARD_LEFTSHIFT,

    KEYBOARD_LEFTALT,

    KEYBOARD_LEFT_GUI,

    KEYBOARD_RIGHTCONTROL,

    KEYBOARD_RIGHTSHIFT,

    KEYBOARD_RIGHTALT,

    KEYBOARD_RIGHT_GUI,

} USBH_HID_KEYBOARD_VALUE_T;
将遥控器的数字键按照原本的数字输入，方向键控制光标方向，OK键回车，*键退格，#键del
复制
uint8_t IRCode2Key(uint8_t ircode)

{

    switch(ircode)

    {

        case 0x45:

            return KEYBOARD_1_EXCLAMATION;

        case 0x46:

            return KEYBOARD_2_AT;

        case 0x47:

            return KEYBOARD_3_NUMBER_SIGN;

        case 0x44:

            return KEYBOARD_4_DOLLAR;

        case 0x40:

            return KEYBOARD_5_PERCENT;

        case 0x43:

            return KEYBOARD_6_CARET;

        case 0x07:

            return KEYBOARD_7_AMPERSAND;

        case 0x15:

            return KEYBOARD_8_ASTERISK;

        case 0x9:

            return KEYBOARD_9_OPARENTHESIS;

        case 0x16:

            return KEYBOARD_BACKSPACE;

        case 0x19:

            return KEYBOARD_0_CPARENTHESIS;

        case 0x0D:

            return KEYBOARD_DELETE;

        case 0x0C:

            break;

        case 0x18:

            return KEYBOARD_UPARROW;

        case 0x5E:

            break;

        case 0x08:

            return KEYBOARD_LEFTARROW;

        case 0x1C:

            return KEYBOARD_ENTER;

        case 0x5A:

            return KEYBOARD_RIGHTARROW;

        case 0x42:

            break;

        case 0x52:

            return KEYBOARD_DOWNARROW;

        case 0x4A:

            break;

        default:

            break;

    }

    return 0;

}
发送按键数据后还要发送一个空的包，表示按键抬起，不然会一直输入，在定时器哪里增加个变量来计时
复制
uint16_t release_key_time = 0;

void IRTimeCount(uint32_t us)

{

    IR_time_us += us;

    if(release_key_time > us)

    {

        release_key_time -= us;

    }

    else if(release_key_time > 0)

    {

        release_key_time = 1;

    }

}

void IRAPP(void)

{

    uint8_t HID_Buffer[8] = {0};

    if(ir_pin_it_flag != 0)

    {

        ir_pin_it_flag = 0;

        IRIOcheck(!LL_GPIO_IsInputPinSet(IR_PIN_GPIO_Port,IR_PIN_Pin));

    }

    if(IR_code_flag == IR_CODE_FLAG_CMD)

    {

        //printf("rev ir data: %02X%02X%02X%02X\r\n",IR_code[0],IR_code[1],IR_code[2],IR_code[3]);

        IR_code_flag = IR_CODE_FLAG_NONE;

        if((IR_code[2]^IR_code[3]) == 0xFF)

        {

            HID_Buffer[2] = IRCode2Key(IR_code[2]);

            USBD_HID_SendReport(&hUsbDeviceFS, HID_Buffer, 8);

            release_key_time = 20000;

        }

    }

    else if(IR_code_flag == IR_CODE_FLAG_REPEAT)

    {

        //printf("rev ir repeat\r\n");

        IR_code_flag = IR_CODE_FLAG_NONE;

    }

    if(release_key_time == 1)

    {

        release_key_time = 0;

        USBD_HID_SendReport(&hUsbDeviceFS, HID_Buffer, 8);

    }

}
需要注意开启USB后要注释掉串口相关操作，不然会有问题，我这里会出现发送空指令变成输入e的情况，最终效果如下

就实际使用来说蓝牙或者2.4G的遥控更好用，这个项目适合对红外解码和USB通讯的学习。



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