简单来说，绝对鼠标 是一种根据绝对坐标系 来定位光标的输入设备。
为了更好地理解，我们通常将其与日常使用的普通鼠标（即相对鼠标 ）进行对比。
核心区别总结
- 绝对鼠标 ：关心“你在哪里 ”。它直接告诉电脑：“把光标放在屏幕的(X, Y)坐标上。”
- 相对鼠标 ：关心“你移动了多少 ”。它告诉电脑：“光标从当前位置向某个方向移动了ΔX和ΔY的距离。”
一、绝对鼠标报告描述符：
const uint8_t HIDMSDescr[] =
{ 0x05,0x01, //0 GLOBAL_USAGE_PAGE(Generic Desktop Controls) 0x09,0x02, //2 LOCAL_USAGE(Mouse) 0xA1,0x01, //4 MAIN_COLLECTION(Applicatior) 0x09,0x01, //6 LOCAL_USAGE(Pointer) 0xA1,0x00, //8 MAIN_COLLECTION(Physical) 0x05,0x09, //12 GLOBAL_USAGE_PAGE(Button) 0x19,0x01, //14 LOCAL_USAGE_MINIMUM(1) 0x29,0x05, //16 LOCAL_USAGE_MAXIMUM(5) 0x15,0x00, //18 GLOBAL_LOGICAL_MINIMUM(0) 0x25,0x01, //20 GLOBAL_LOCAL_MAXIMUM(1) 0x95,0x05, //22 GLOBAL_REPORT_COUNT(5) 0x75,0x01, //24 GLOBAL_REPORT_SIZE(1) 0x81,0x02, //26 MAIN_INPUT(data var absolute NoWrap linear PreferredState NoNullPosition NonVolatile ) Input 0.50x95,0x01, //28 GLOBAL_REPORT_COUNT(1) 0x75,0x03, //30 GLOBAL_REPORT_SIZE(3) 0x81,0x03, //32 MAIN_INPUT(const var absolute NoWrap linear PreferredState NoNullPosition NonVolatile ) Input 1.00x05,0x01, //34 GLOBAL_USAGE_PAGE(Generic Desktop Controls) 0x09,0x30, //36 LOCAL_USAGE(X) 0x15,0x00, //38 GLOBAL_LOGICAL_MINIMUM(0) 0x26,0xFF,0x0F, //40 GLOBAL_LOCAL_MAXIMUM(4095/4095) 0x75,0x0D, //43 GLOBAL_REPORT_SIZE(13) 0x95,0x01, //45 GLOBAL_REPORT_COUNT(1) 0x81,0x02, //47 MAIN_INPUT(data var absolute NoWrap linear PreferredState NoNullPosition NonVolatile ) Input 2.50x75,0x03, //49 GLOBAL_REPORT_SIZE(3) 0x95,0x01, //51 GLOBAL_REPORT_COUNT(1) 0x81,0x03, //53 MAIN_INPUT(const var absolute NoWrap linear PreferredState NoNullPosition NonVolatile ) Input 3.00x09,0x31, //55 LOCAL_USAGE(Y) 0x15,0x00, //57 GLOBAL_LOGICAL_MINIMUM(0) 0x26,0xFF,0x0F, //59 GLOBAL_LOCAL_MAXIMUM(4095/4095) 0x75,0x0D, //62 GLOBAL_REPORT_SIZE(13) 0x95,0x01, //64 GLOBAL_REPORT_COUNT(1) 0x81,0x02, //66 MAIN_INPUT(data var absolute NoWrap linear PreferredState NoNullPosition NonVolatile ) Input 4.50x75,0x03, //68 GLOBAL_REPORT_SIZE(3) 0x95,0x01, //70 GLOBAL_REPORT_COUNT(1) 0x81,0x03, //72 MAIN_INPUT(const var absolute NoWrap linear PreferredState NoNullPosition NonVolatile ) Input 5.00x09,0x38, //74 LOCAL_USAGE(Wheel) 0x15,0x81, //76 GLOBAL_LOGICAL_MINIMUM(-127) 0x25,0x7F, //78 GLOBAL_LOCAL_MAXIMUM(127) 0x75,0x08, //80 GLOBAL_REPORT_SIZE(8) 0x95,0x01, //82 GLOBAL_REPORT_COUNT(1) 0x81,0x06, //84 MAIN_INPUT(data var relative NoWrap linear PreferredState NoNullPosition NonVolatile ) Input 6.00xC0, //86 MAIN_COLLECTION_END 0xC0, //87 MAIN_COLLECTION_END
};
二、报告描述符解析：
|
字节位置
|
位范围
|
功能说明
|
数值含义
|
|---|---|---|---|
|
字节0
|
位0-4
|
按钮状态
|
每个位对应一个按钮（0=未按下，1=按下）
位0: 按钮1（左键） |
|
位5-7 |
填充位 |
固定为0，用于数据对齐 | |
|
字节1 |
位0-7 |
X坐标低字节 |
X轴坐标的低8位（0-255） |
|
字节2 |
位0-4 |
X坐标高字节 |
X轴坐标的高5位（与字节1组合成13位） |
|
位5-7 |
填充位 |
固定为0 | |
|
字节3 |
位0-7 |
Y坐标低字节 |
Y轴坐标的低8位（0-255） |
|
字节4 |
位0-4 |
Y坐标高字节 |
Y轴坐标的高5位（与字节3组合成13位） |
|
位5-7 |
填充位 |
固定为0 | |
|
字节5 |
位0-7 |
滚轮数据 |
相对滚轮值（-127到+127） |
三、数据上传接口，示例程序将绝对鼠标写在接口1-端点2（接口0为键盘）；需先查看自己电脑屏幕分辨率信息（见下图），此次测试电脑电脑分辨率为1920*1080；
/********************************************************************** @fn DevHIDMouseReport** @brief 上报鼠标数据** @return none*/
uint8_t MouseStatus[ 6 ] = { 0x00 };
__HIGH_CODE
void DevHIDMouseReport(uint8_t button , uint16_t X , uint16_t Y , int8_t wheel)
{uint16_t x_pix_val = 0;/* 绝对鼠标x坐标值 */uint16_t y_pix_val = 0;/* 绝对鼠标y坐标值 */x_pix_val = (X) * 4096/1920;//4096为绝对鼠标报告描述符中X轴分辨率最大值,1920为当前主机电脑的X分辨率y_pix_val = (Y) * 4096/1080;//4096为绝对鼠标报告描述符中Y轴分辨率最大值,1080为当前主机电脑的X分辨率
MouseStatus[ 0 ] = button;MouseStatus[ 1 ] = (uint8_t)x_pix_val;/* X_Val_l */MouseStatus[ 2 ] = (uint8_t)(x_pix_val>>8);/* X_Val_h */MouseStatus[ 3 ] = (uint8_t)y_pix_val;/* Y_Val_l */MouseStatus[ 4 ] = (uint8_t)(y_pix_val>>8);/* Y_Val_h */MouseStatus[ 5 ] = wheel;//-127 ~ 127
memcpy(pEP2_IN_DataBuf, MouseStatus, sizeof(MouseStatus));//拷贝到端点2DMA缓存中DevEP2_IN_Deal(sizeof(MouseStatus));//端点2置ACK,等待主机来取数据
}
四、数据上报演示
/********************************************************************** @fn main** @brief 主函数** @return none*/
int main()
{HSECFG_Capacitance(HSECap_18p);SetSysClock(SYSCLK_FREQ);DebugInit();PRINT("start\n");pEP0_RAM_Addr = EP0_Databuf;pEP1_RAM_Addr = EP1_Databuf;pEP2_RAM_Addr = EP2_Databuf;pEP3_RAM_Addr = EP3_Databuf;USB_DeviceInit();PFIC_EnableIRQ(USB_IRQn);while(1){//模拟鼠标从(0,0)滑动到(648,648)uint16_t Y_val=0;for(uint16_t X_val = 0 ; X_val<=648;X_val+=16){DevHIDMouseReport(0,X_val,Y_val,0);Y_val += 16;DelayMs(20);}DelayMs(20);DevHIDMouseReport(0,0,0,-1);//鼠标滚轮向下移动一个单位DelayMs(20);DevHIDMouseReport(0,0,0, 1);//鼠标滚轮向上移动一个单位DelayMs(1000);}
}