使用libusb同步函数读取USB鼠标、上机实验

IMX6ULL/doc_pic/12_USB/07_使用libusb读取鼠标数据.md

@@ -164,12 +164,13 @@ libusb_control_transfer(dev_handle, 0x21, 0x09, wValue, wIndex, &data, 1, timeou
 
 通过中断传输可以读到鼠标数据，它是8字节的数据，格式如下：
 
-| 偏移 | 大小  | 描述     |
+| 偏移 | 大小         | 描述     |
-| ---- | ----- | -------- |
+| ---- | ------------ | -------- |
-| 0    | 1字节 | 按键状态 |
+| 0    | 1字节        |          |
-| 1    | 1字节 | X位移    |
+| 1    | 1字节        | 按键状态 |
-| 2    | 1字节 | Y位移    |
+| 2    | 2字节        | X位移    |
-| 3    | 1字节 | 滚轮     |
+| 4    | 2字节        | Y位移    |
+| 6    | 1字节或2字节 | 滚轮     |
 
 
 
@@ -196,5 +197,86 @@ USB规范里为每个按键定义了16位的按键值，注意：它是16位的
 
 
 
+## 2. 使用同步接口读取鼠标数据
+
+源码在GIT仓库如下位置：
+
+![image-20220923143814977](pic/60_libusb_mouse_sync_src.png)
+
+
+
+### 2.1 编写源码
+
+```c
+
+```
+
+
+
+### 2.2 上机实验
+
+#### 2.2.1 在Ubuntu上实验
+
+```shell
+// 1. 安装开发包
+$ sudo apt install libusb-1.0-0-dev
+    
+// 2. 修改源码，包含libusb.h 头文件时用如下代码
+#include <libusb-1.0/libusb.h>
+
+// 3. 编译程序指定库
+gcc -o readmouse readmouse.c -lusb-1.0
+```
+
+
+
+#### 2.2.2 在开发板上实验
+
+
+
+* 交叉编译libusb
+
+  ```shell
+  sudo apt-get install libtool
+  
+  unzip libusb-1.0.26.zip
+  cd libusb-1.0.26
+  ./autogen.sh
+  
+  ./configure --host=arm-buildroot-linux-gnueabihf --prefix=$PWD/tmp
+  
+  make
+  
+  make install
+  
+  ls tmp/
+  include  lib
+  
+  ```
+
+  
+
+* 安装库、头文件到工具链的目录里
+
+  ```shell
+  libusb-1.0.26/tmp/lib$ cp * -rfd /home/book/100ask_imx6ull-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/
+  
+  libusb-1.0.26/tmp/include$ cp libusb-1.0 -rf /home/book/100ask_imx6ull-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/arm-buildroot-linux-gnueabihf/sysroot/usr/include/
+  ```
+
+  
+
+* 交叉编译app
+
+  ```shell
+  arm-buildroot-linux-gnueabihf-gcc -o readmouse readmouse.c -lusb-1.0
+  ```
+
+  
+
+
+
+
+
 
 

IMX6ULL/source/12_USB/02_libusb_mouse_sync/readmouse.c

@@ -0,0 +1,145 @@
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libusb-1.0/libusb.h>
+
+int main(int argc, char **argv)
+{
+	int err;
+	libusb_device *dev, **devs;
+    int num_devices;
+    int endpoint;
+    int interface_num;
+    int found = 0;
+    int transferred;
+    int count = 0;
+    unsigned char buffer[16];
+    struct libusb_config_descriptor *config_desc;
+    struct libusb_device_handle *dev_handle = NULL;
+    
+    /* libusb_init */
+
+	err = libusb_init(NULL);
+	if (err < 0) {
+		fprintf(stderr, "failed to initialise libusb %d - %s\n", err, libusb_strerror(err));
+		exit(1);
+	}
+
+    /* get device list */
+    if ((num_devices = libusb_get_device_list(NULL, &devs)) < 0) {
+        fprintf(stderr, "libusb_get_device_list() failed\n");
+        libusb_exit(NULL);
+        exit(1);
+    }
+    fprintf(stdout, "libusb_get_device_list() ok\n");
+
+    /* for each device, get config descriptor */
+	for (int i = 0; i < num_devices; i++) {
+        dev = devs[i];
+
+        /* parse interface descriptor, find usb mouse */        
+        err = libusb_get_config_descriptor(dev, 0, &config_desc);
+        if (err) {
+            fprintf(stderr, "could not get configuration descriptor\n");
+            continue;
+        }
+        fprintf(stdout, "libusb_get_config_descriptor() ok\n");
+
+        for (int interface = 0; interface < config_desc->bNumInterfaces; interface++) {
+            const struct libusb_interface_descriptor *intf_desc = &config_desc->interface[interface].altsetting[0];
+            interface_num = intf_desc->bInterfaceNumber;
+
+            if (intf_desc->bInterfaceClass != 3 || intf_desc->bInterfaceProtocol != 2)
+                continue;
+            else
+            
+{
+                /* 找到了USB鼠标 */
+                fprintf(stdout, "find usb mouse ok\n");
+                for (int ep = 0; ep < intf_desc->bNumEndpoints; ep++)
+                {
+                    if ((intf_desc->endpoint[ep].bmAttributes & 3) == LIBUSB_TRANSFER_TYPE_INTERRUPT ||
+                            (intf_desc->endpoint[ep].bEndpointAddress & 0x80) == LIBUSB_ENDPOINT_IN) {
+                        /* 找到了输入的中断端点 */
+                        fprintf(stdout, "find in int endpoint\n");
+                        endpoint = intf_desc->endpoint[ep].bEndpointAddress;
+                        found = 1;
+                        break;
+                    }
+                    
+                }
+            }
+
+            if (found)
+                break;
+        }
+
+        libusb_free_config_descriptor(config_desc);
+        
+        if (found)
+            break;        
+	}
+
+    if (!found)
+    {
+        /* free device list */
+        libusb_free_device_list(devs, 1);
+        libusb_exit(NULL);
+        exit(1);
+    }
+
+    if (found)
+    {
+        /* libusb_open */
+        err = libusb_open(dev, &dev_handle);
+        if (err)
+        {
+            fprintf(stderr, "failed to open usb mouse\n");
+            exit(1);
+        }
+        fprintf(stdout, "libusb_open ok\n");
+    }
+
+    /* free device list */
+    libusb_free_device_list(devs, 1);
+
+    /* claim interface */
+    libusb_set_auto_detach_kernel_driver(dev_handle, 1);  
+    err = libusb_claim_interface(dev_handle, interface_num);
+    if (err)
+    {
+        fprintf(stderr, "failed to libusb_claim_interface\n");
+        exit(1);
+    }
+    fprintf(stdout, "libusb_claim_interface ok\n");
+
+    /* libusb_interrupt_transfer */
+    while (1)
+    {
+		err = libusb_interrupt_transfer(dev_handle, endpoint, buffer, 16, &transferred, 5000);
+		if (!err) {
+			/* parser data */
+            printf("%04d datas: ", count++);
+            for (int i = 0; i < transferred; i++)
+            {
+                printf("%02x ", buffer[i]);
+            }
+            printf("\n");
+		} else if (err == LIBUSB_ERROR_TIMEOUT){
+            fprintf(stderr, "libusb_interrupt_transfer timout\n");
+		} else {
+            fprintf(stderr, "libusb_interrupt_transfer err : %d\n", err);
+            //exit(1);
+		}
+        
+    }
+
+    /* libusb_close */
+    libusb_release_interface(dev_handle, interface_num);
+    libusb_close(dev_handle);
+    libusb_exit(NULL);
+}
+

README.md

@@ -666,6 +666,15 @@ git clone https://e.coding.net/weidongshan/linux/doc_and_source_for_drivers.git
   07.1_USB鼠标协议
   ```
 
+* 2022.09.28 发布"USB子系统"
+
+  ```shell
+  07.2_使用libusb同步函数读取USB鼠标
+  07.3_上机实验1_在Ubuntu上实验
+  07.4_上机实验2_交叉编译libusb
+  07.5_上机实验3_在板上实验
+  ```
+
   
 
 

STM32MP157/doc_pic/12_USB/07_使用libusb读取鼠标数据.md

@@ -164,12 +164,13 @@ libusb_control_transfer(dev_handle, 0x21, 0x09, wValue, wIndex, &data, 1, timeou
 
 通过中断传输可以读到鼠标数据，它是8字节的数据，格式如下：
 
-| 偏移 | 大小  | 描述     |
+| 偏移 | 大小         | 描述     |
-| ---- | ----- | -------- |
+| ---- | ------------ | -------- |
-| 0    | 1字节 | 按键状态 |
+| 0    | 1字节        |          |
-| 1    | 1字节 | X位移    |
+| 1    | 1字节        | 按键状态 |
-| 2    | 1字节 | Y位移    |
+| 2    | 2字节        | X位移    |
-| 3    | 1字节 | 滚轮     |
+| 4    | 2字节        | Y位移    |
+| 6    | 1字节或2字节 | 滚轮     |
 
 
 
@@ -196,5 +197,86 @@ USB规范里为每个按键定义了16位的按键值，注意：它是16位的
 
 
 
+## 2. 使用同步接口读取鼠标数据
+
+源码在GIT仓库如下位置：
+
+![image-20220923143814977](pic/60_libusb_mouse_sync_src.png)
+
+
+
+### 2.1 编写源码
+
+```c
+
+```
+
+
+
+### 2.2 上机实验
+
+#### 2.2.1 在Ubuntu上实验
+
+```shell
+// 1. 安装开发包
+$ sudo apt install libusb-1.0-0-dev
+    
+// 2. 修改源码，包含libusb.h 头文件时用如下代码
+#include <libusb-1.0/libusb.h>
+
+// 3. 编译程序指定库
+gcc -o readmouse readmouse.c -lusb-1.0
+```
+
+
+
+#### 2.2.2 在开发板上实验
+
+
+
+* 交叉编译libusb
+
+  ```shell
+  sudo apt-get install libtool
+  
+  unzip libusb-1.0.26.zip
+  cd libusb-1.0.26
+  ./autogen.sh
+  
+  ./configure --host=arm-buildroot-linux-gnueabihf --prefix=$PWD/tmp
+  
+  make
+  
+  make install
+  
+  ls tmp/
+  include  lib
+  
+  ```
+
+  
+
+* 安装库、头文件到工具链的目录里
+
+  ```shell
+  libusb-1.0.26/tmp/lib$ cp * -rfd /home/book/100ask_imx6ull-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/
+  
+  libusb-1.0.26/tmp/include$ cp libusb-1.0 -rf /home/book/100ask_imx6ull-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/arm-buildroot-linux-gnueabihf/sysroot/usr/include/
+  ```
+
+  
+
+* 交叉编译app
+
+  ```shell
+  arm-buildroot-linux-gnueabihf-gcc -o readmouse readmouse.c -lusb-1.0
+  ```
+
+  
+
+
+
+
+
 
 

STM32MP157/source/A7/12_USB/02_libusb_mouse_sync/readmouse.c

@@ -0,0 +1,145 @@
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libusb-1.0/libusb.h>
+
+int main(int argc, char **argv)
+{
+	int err;
+	libusb_device *dev, **devs;
+    int num_devices;
+    int endpoint;
+    int interface_num;
+    int found = 0;
+    int transferred;
+    int count = 0;
+    unsigned char buffer[16];
+    struct libusb_config_descriptor *config_desc;
+    struct libusb_device_handle *dev_handle = NULL;
+    
+    /* libusb_init */
+
+	err = libusb_init(NULL);
+	if (err < 0) {
+		fprintf(stderr, "failed to initialise libusb %d - %s\n", err, libusb_strerror(err));
+		exit(1);
+	}
+
+    /* get device list */
+    if ((num_devices = libusb_get_device_list(NULL, &devs)) < 0) {
+        fprintf(stderr, "libusb_get_device_list() failed\n");
+        libusb_exit(NULL);
+        exit(1);
+    }
+    fprintf(stdout, "libusb_get_device_list() ok\n");
+
+    /* for each device, get config descriptor */
+	for (int i = 0; i < num_devices; i++) {
+        dev = devs[i];
+
+        /* parse interface descriptor, find usb mouse */        
+        err = libusb_get_config_descriptor(dev, 0, &config_desc);
+        if (err) {
+            fprintf(stderr, "could not get configuration descriptor\n");
+            continue;
+        }
+        fprintf(stdout, "libusb_get_config_descriptor() ok\n");
+
+        for (int interface = 0; interface < config_desc->bNumInterfaces; interface++) {
+            const struct libusb_interface_descriptor *intf_desc = &config_desc->interface[interface].altsetting[0];
+            interface_num = intf_desc->bInterfaceNumber;
+
+            if (intf_desc->bInterfaceClass != 3 || intf_desc->bInterfaceProtocol != 2)
+                continue;
+            else
+            
+{
+                /* 找到了USB鼠标 */
+                fprintf(stdout, "find usb mouse ok\n");
+                for (int ep = 0; ep < intf_desc->bNumEndpoints; ep++)
+                {
+                    if ((intf_desc->endpoint[ep].bmAttributes & 3) == LIBUSB_TRANSFER_TYPE_INTERRUPT ||
+                            (intf_desc->endpoint[ep].bEndpointAddress & 0x80) == LIBUSB_ENDPOINT_IN) {
+                        /* 找到了输入的中断端点 */
+                        fprintf(stdout, "find in int endpoint\n");
+                        endpoint = intf_desc->endpoint[ep].bEndpointAddress;
+                        found = 1;
+                        break;
+                    }
+                    
+                }
+            }
+
+            if (found)
+                break;
+        }
+
+        libusb_free_config_descriptor(config_desc);
+        
+        if (found)
+            break;        
+	}
+
+    if (!found)
+    {
+        /* free device list */
+        libusb_free_device_list(devs, 1);
+        libusb_exit(NULL);
+        exit(1);
+    }
+
+    if (found)
+    {
+        /* libusb_open */
+        err = libusb_open(dev, &dev_handle);
+        if (err)
+        {
+            fprintf(stderr, "failed to open usb mouse\n");
+            exit(1);
+        }
+        fprintf(stdout, "libusb_open ok\n");
+    }
+
+    /* free device list */
+    libusb_free_device_list(devs, 1);
+
+    /* claim interface */
+    libusb_set_auto_detach_kernel_driver(dev_handle, 1);  
+    err = libusb_claim_interface(dev_handle, interface_num);
+    if (err)
+    {
+        fprintf(stderr, "failed to libusb_claim_interface\n");
+        exit(1);
+    }
+    fprintf(stdout, "libusb_claim_interface ok\n");
+
+    /* libusb_interrupt_transfer */
+    while (1)
+    {
+		err = libusb_interrupt_transfer(dev_handle, endpoint, buffer, 16, &transferred, 5000);
+		if (!err) {
+			/* parser data */
+            printf("%04d datas: ", count++);
+            for (int i = 0; i < transferred; i++)
+            {
+                printf("%02x ", buffer[i]);
+            }
+            printf("\n");
+		} else if (err == LIBUSB_ERROR_TIMEOUT){
+            fprintf(stderr, "libusb_interrupt_transfer timout\n");
+		} else {
+            fprintf(stderr, "libusb_interrupt_transfer err : %d\n", err);
+            //exit(1);
+		}
+        
+    }
+
+    /* libusb_close */
+    libusb_release_interface(dev_handle, interface_num);
+    libusb_close(dev_handle);
+    libusb_exit(NULL);
+}
+