最近需要做一个小工具，要用到USB CDC+HID设备。又重新研究了一下USB协议和STM32的USB驱动库，也踩了不少坑，因此把代码修改过程记录一下。
开发环境：
ST-LINK v2
STM32H743开发板
PC windows 11
cubeMX v6.9.2
cubeIDE v1.13.2
cubeprogramer v2.14.0
参考资料：
-
STMicroelectronics/stm32_mw_usb_device: Provides the USB Device library part of the STM32Cube MCU Component “middleware” for all STM32xx series. (github.com)
-
STM32实现USB复合设备CDC MSC的正确实现方式-物联沃-IOTWORD物联网
基于STM32CubeMx的USB CDC+MSC复合设备 - CodeBuug -
CDC + MSC USB Composite Device on STM32 HAL / Sudo Null IT News
-
STMicroelectronics (github.com)
-
Introduction to USB with STM32 - stm32mcu (stmicroelectronics.cn)
-
ST官方USB培训课程
MOOC - STM32 USB training - YouTube
码农的自我修养 - USB键盘和鼠标的数据包格式_键盘协议-CSDN博客 -
基于STM32CUBE的USB键盘例程 | MCU起航 (mcublog.cn)
-
基于STM32CUBE的USB鼠标键盘二合一 | MCU起航 (mcublog.cn)
-
USB调试工具大全 - USB中文网 (usbzh.com)
-
USB键盘实现——带指示灯的键盘（九）-CSDN博客
-
USB 键盘_tyustli的博客-CSDN博客
-
【经验分享】USB CDC 类入门培训 (stmicroelectronics.cn)
-
STM32 USB如何配置多个CDC设备—5个CDC设备 - 知乎 (zhihu.com)
-
【精选】基于STM32实现USB复合设备CDC+MSC正确实现方式_stm32 usb复合设备-CSDN博客
-
wenyezhong/usb_composite (github.com)
-
CDC + MSC USB Composite Device on STM32 HAL / Sudo Null IT News
-
Introduction to USB with STM32 - stm32mcu (stmicroelectronics.cn)
-
Defined Class Codes | USB-IF
要在一个USB接口外设上实现多个设备，较方便的方式就是构建复合设备，英文称做"composite device“。只要在配置描述符中把每个设备的每一组接口都描述清楚，PC就能分别实现对每个设备功能驱动了。 ST官方提供了一个项目仓库stm32_mw_usb_device/Class/CompositeBuilder/Src at master · STMicroelectronics/stm32_mw_usb_device (github.com)，里面包含了各种设备类的中间层代码，其中包含一个符合设备类，它不是一个USB设备类，而是提供了一个将其它设备整合到一起的程序入口，我们就基于此进行修改。最终我实现了一个VCP+HID键鼠套装复合设备。
操作步骤：
1.cubeMX生成工程
2.放入复合设备中间层代码
2.1 放入代码
把从ST提供的中间层代码库中的“CompositeBuilder”文件夹复制到工程目录的USB Class路径下。如下：
2.2 在工程配置中添加USE_USBD_COMPOSITE宏定义
2.3 修改代码BUG
虽然是ST官方提供的代码，但是用起来仍然是一堆BUG和很多未完成的功能，一个一个来把它解掉。这里我把代码修改的解释直接写到注释中，请看代码：
usbd_composite_builder.h
@@ -30,6 +30,7 @@ extern "C" {
/*这里增加几个宏定义，打开我们需要的设备类，CDC & HID，复合设备的描述符需要使用IAD描述符进行包装，所以USB_IAD宏也要打开*/
+#define USBD_CMPSIT_ACTIVATE_HID 1U
+#define USBD_CMPSIT_ACTIVATE_CDC 1U
+#define USBD_COMPOSITE_USE_IAD 1U
+#define USBD_CMPST_MAX_INST_NUM 2U#if USBD_CMPSIT_ACTIVATE_HID == 1U
@@ -223,7 +224,7 @@ typedef struct#endif /* (USBD_CMPSIT_ACTIVATE_CDC == 1) || (USBD_CMPSIT_ACTIVATE_RNDIS == 1) || (USBD_CMPSIT_ACTIVATE_CDC_ECM == 1)*/
/*我实际使用了芯片上的两个USB外设一个HS和一个FS，所以这个变量需要2套，用于放置各自的描述符函数指针，因此我这里要改成一个数据，如果只使用一个USB外设，就不需要改*/
-extern USBD_ClassTypeDef USBD_CMPSIT;
+extern USBD_ClassTypeDef USBD_CMPSIT[];/* Exported functions prototypes ---------------------------------------------*/uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev);
usbd_composite_builder.c
@@ -158,7 +163,7 @@ static void USBD_CMPSIT_MTPDesc(USBD_HandleTypeDef *pdev, uint32_t pConf, __IO* @{*//* This structure is used only for the Configuration descriptors and Device Qualifier *//*我使用了两套USB外设，所以这个数据结构要两套*/
-USBD_ClassTypeDef USBD_CMPSIT =
+USBD_ClassTypeDef USBD_CMPSIT[USBD_CMPST_MAX_INST_NUM] = {{NULL, /* Init, */NULL, /* DeInit, */
@@ -181,14 +186,36 @@ USBD_ClassTypeDef USBD_CMPSIT =#if (USBD_SUPPORT_USER_STRING_DESC == 1U)NULL,#endif /* USBD_SUPPORT_USER_STRING_DESC */
-};
-
+},
+{
+ NULL, /* Init, */
+ NULL, /* DeInit, */
+ NULL, /* Setup, */
+ NULL, /* EP0_TxSent, */
+ NULL, /* EP0_RxReady, */
+ NULL, /* DataIn, */
+ NULL, /* DataOut, */
+ NULL, /* SOF, */
+ NULL,
+ NULL,
+#ifdef USE_USB_HS
+ USBD_CMPSIT_GetHSCfgDesc,
+#else
+ NULL,
+#endif /* USE_USB_HS */
+ USBD_CMPSIT_GetFSCfgDescHS,
+ USBD_CMPSIT_GetOtherSpeedCfgDescHS,
+ USBD_CMPSIT_GetDeviceQualifierDescriptorHS,
+#if (USBD_SUPPORT_USER_STRING_DESC == 1U)
+ NULL,
+#endif /* USBD_SUPPORT_USER_STRING_DESC */
+}};/* The generic configuration descriptor buffer that will be filled by builderSize of the buffer is the maximum possible configuration descriptor size. */
/*申明两套配置描述符的memory空间*/
-__ALIGN_BEGIN static uint8_t USBD_CMPSIT_FSCfgDesc[USBD_CMPST_MAX_CONFDESC_SZ] __ALIGN_END = {0};
-static uint8_t *pCmpstFSConfDesc = USBD_CMPSIT_FSCfgDesc;
+__ALIGN_BEGIN static uint8_t USBD_CMPSIT_FSCfgDesc[USBD_CMPST_MAX_INST_NUM][USBD_CMPST_MAX_CONFDESC_SZ] __ALIGN_END = {0};
+static uint8_t *pCmpstFSConfDesc = USBD_CMPSIT_FSCfgDesc[0];/* Variable that dynamically holds the current size of the configuration descriptor */
-static __IO uint32_t CurrFSConfDescSz = 0U;
+static __IO uint32_t CurrFSConfDescSz[USBD_CMPST_MAX_INST_NUM] = {0U};#ifdef USE_USB_HS__ALIGN_BEGIN static uint8_t USBD_CMPSIT_HSCfgDesc[USBD_CMPST_MAX_CONFDESC_SZ] __ALIGN_END = {0};
@@ -266,12 +293,12 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev){uint8_t idxIf = 0U;uint8_t iEp = 0U;/*两套设备通过pdef->id变量进行区分，它是在设备初始化时被赋值*/
-
+ pCmpstFSConfDesc = USBD_CMPSIT_FSCfgDesc[pdev->id];/* For the first class instance, start building the config descriptor common part */if (pdev->classId == 0U){/* Add configuration and IAD descriptors */
- USBD_CMPSIT_AddConfDesc((uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz);
+ USBD_CMPSIT_AddConfDesc((uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id]);#ifdef USE_USB_HSUSBD_CMPSIT_AddConfDesc((uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz);#endif /* USE_USB_HS */
@@ -290,7 +317,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)pdev->tclasslist[pdev->classId].Ifs[0] = idxIf;/* Assign endpoint numbers *//*这里是HID描述符字段，一般是直接在描述符数据中修改，使用这个官方库接口就要在这里修改，它会自动计算描述符大小。这里把HID端点数量改成2个*/
- pdev->tclasslist[pdev->classId].NumEps = 1U; /* EP1_IN */
+ pdev->tclasslist[pdev->classId].NumEps = 2U; /* EP1_IN *//* Set IN endpoint slot */iEp = pdev->tclasslist[pdev->classId].EpAdd[0];
@@ -298,11 +325,15 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)/* Assign IN Endpoint */USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_INTR, pdev->tclasslist[pdev->classId].CurrPcktSze);
/*仿照输入端点的配置，分配输出端点*/
+ /* Set OUT endpoint slot */
+ iEp = pdev->tclasslist[pdev->classId].EpAdd[1];
+ USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_INTR, pdev->tclasslist[pdev->classId].CurrPcktSze);
+/* Configure and Append the Descriptor *//* 生成HID设备的描述符，包括IAD,interface,EPIN,EPOUT */
- USBD_CMPSIT_HIDMouseDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_HIDKBMouseDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSbreak;
@@ -330,7 +361,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_BULK, pdev->tclasslist[pdev->classId].CurrPcktSze);/* Configure and Append the Descriptor */
- USBD_CMPSIT_MSCDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_MSCDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_MSCDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -366,7 +397,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_INTR, CDC_CMD_PACKET_SIZE);/* Configure and Append the Descriptor */
- USBD_CMPSIT_CDCDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_CDCDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_CDCDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -389,7 +420,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)pdev->tclasslist[pdev->classId].NumEps = 0U; /* only EP0 is used *//* Configure and Append the Descriptor */
- USBD_CMPSIT_DFUDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_DFUDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_DFUDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -425,7 +456,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_INTR, CDC_RNDIS_CMD_PACKET_SIZE);/* Configure and Append the Descriptor */
- USBD_CMPSIT_RNDISDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_RNDISDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_RNDISDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -461,7 +492,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_INTR, CDC_ECM_CMD_PACKET_SIZE);/* Configure and Append the Descriptor */
- USBD_CMPSIT_CDC_ECMDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_CDC_ECMDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_CDC_ECMDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -491,7 +522,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_ISOC, pdev->tclasslist[pdev->classId].CurrPcktSze);/* Configure and Append the Descriptor (only FS mode supported) */
- USBD_CMPSIT_AUDIODesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_AUDIODesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);break;#endif /* USBD_CMPSIT_ACTIVATE_AUDIO */
@@ -518,7 +549,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_INTR, pdev->tclasslist[pdev->classId].CurrPcktSze);/* Configure and Append the Descriptor */
- USBD_CMPSIT_CUSTOMHIDDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_CUSTOMHIDDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_CUSTOMHIDDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -548,7 +579,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_ISOC, pdev->tclasslist[pdev->classId].CurrPcktSze);/* Configure and Append the Descriptor */
- USBD_CMPSIT_VIDEODesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_VIDEODesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_VIDEODesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -580,7 +611,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_BULK, pdev->tclasslist[pdev->classId].CurrPcktSze);/* Configure and Append the Descriptor */
- USBD_CMPSIT_PRNTDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_PRNTDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_PRNTDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -616,7 +647,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_INTR, CCID_CMD_PACKET_SIZE);/* Configure and Append the Descriptor */
- USBD_CMPSIT_CCIDDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_CCIDDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_CCIDDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -652,7 +683,7 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)USBD_CMPSIT_AssignEp(pdev, iEp, USBD_EP_TYPE_INTR, MTP_CMD_PACKET_SIZE);/* Configure and Append the Descriptor */
- USBD_CMPSIT_MTPDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz, (uint8_t)USBD_SPEED_FULL);
+ USBD_CMPSIT_MTPDesc(pdev, (uint32_t)pCmpstFSConfDesc, &CurrFSConfDescSz[pdev->id], (uint8_t)USBD_SPEED_FULL);#ifdef USE_USB_HSUSBD_CMPSIT_MTPDesc(pdev, (uint32_t)pCmpstHSConfDesc, &CurrHSConfDescSz, (uint8_t)USBD_SPEED_HIGH);
@@ -680,9 +711,23 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)*/uint8_t *USBD_CMPSIT_GetFSCfgDesc(uint16_t *length){
@@ -680,9 +711,23 @@ uint8_t USBD_CMPSIT_AddToConfDesc(USBD_HandleTypeDef *pdev)*//*由于我实际使用了两套设备，所以这里的描述符数据都有两份，返回地址时需要加上索引，后文类似，不再赘述*/uint8_t *USBD_CMPSIT_GetFSCfgDesc(uint16_t *length){
- *length = (uint16_t)CurrFSConfDescSz;
+ *length = (uint16_t)CurrFSConfDescSz[DEVICE_FS];
+
+ return USBD_CMPSIT_FSCfgDesc[DEVICE_FS];
+}#ifdef USE_USB_HS
@@ -708,9 +753,22 @@ uint8_t *USBD_CMPSIT_GetHSCfgDesc(uint16_t *length)*/uint8_t *USBD_CMPSIT_GetOtherSpeedCfgDesc(uint16_t *length){
- *length = (uint16_t)CurrFSConfDescSz;
+ *length = (uint16_t)CurrFSConfDescSz[DEVICE_FS];
+
+ return USBD_CMPSIT_FSCfgDesc[DEVICE_FS];
+}/**
@@ -725,6 +783,12 @@ uint8_t *USBD_CMPSIT_GetDeviceQualifierDescriptor(uint16_t *length)return USBD_CMPSIT_DeviceQualifierDesc;}+uint8_t *USBD_CMPSIT_GetDeviceQualifierDescriptorHS(uint16_t *length)
+{
+ *length = (uint16_t)(sizeof(USBD_CMPSIT_DeviceQualifierDesc));
+ return USBD_CMPSIT_DeviceQualifierDesc;
+}
+/*** @brief USBD_CMPSIT_FindFreeIFNbr* Find the first interface available slot
@@ -808,39 +872,60 @@ static void USBD_CMPSIT_AssignEp(USBD_HandleTypeDef *pdev, uint8_t Add, uint8_t}#if USBD_CMPSIT_ACTIVATE_HID == 1
+/**
- * @brief USBD_CMPSIT_HIDMouseDesc
+ * @brief USBD_CMPSIT_HIDKBMouseDesc* Configure and Append the HID Mouse Descriptor* @param pdev: device instance* @param pConf: Configuration descriptor pointer* @param Sze: pointer to the current configuration descriptor size* @retval None*/
/*这里需要重点关注，官方代码中没有IAD描述符（好像不要也行）。*/
-static void USBD_CMPSIT_HIDMouseDesc(USBD_HandleTypeDef *pdev, uint32_t pConf,
+static void USBD_CMPSIT_HIDKBMouseDesc(USBD_HandleTypeDef *pdev, uint32_t pConf,__IO uint32_t *Sze, uint8_t speed){static USBD_IfDescTypeDef *pIfDesc;static USBD_EpDescTypeDef *pEpDesc;
- static USBD_HIDDescTypeDef *pHidMouseDesc;
+ static USBD_HIDDescTypeDef *pHidKBMouseDesc;
+
+#if USBD_COMPOSITE_USE_IAD == 1
+ static USBD_IadDescTypeDef *pIadDesc;
+#endif /* USBD_COMPOSITE_USE_IAD == 1 */+#if USBD_COMPOSITE_USE_IAD == 1
+ pIadDesc = ((USBD_IadDescTypeDef *)(pConf + *Sze));
+ pIadDesc->bLength = (uint8_t)sizeof(USBD_IadDescTypeDef);
+ pIadDesc->bDescriptorType = USB_DESC_TYPE_IAD; /* IAD descriptor */
+ pIadDesc->bFirstInterface = pdev->tclasslist[pdev->classId].Ifs[0];
+ pIadDesc->bInterfaceCount = 1U; /* 1 interfaces */
+ pIadDesc->bFunctionClass = 0x03U;
+ pIadDesc->bFunctionSubClass = 0x00U;
+ pIadDesc->bFunctionProtocol = 0x00U;
+ pIadDesc->iFunction = 0U; /* String Index */
+ *Sze += (uint32_t)sizeof(USBD_IadDescTypeDef);
+#endif /* USBD_COMPOSITE_USE_IAD == 1 *//* Append HID Interface descriptor to Configuration descriptor */__USBD_CMPSIT_SET_IF(pdev->tclasslist[pdev->classId].Ifs[0], 0U, \/*鼠标的配置(0x02)，改成键盘(0x01)的*/
- (uint8_t)(pdev->tclasslist[pdev->classId].NumEps), 0x03U, 0x01U, 0x02U, 0U);
+ (uint8_t)(pdev->tclasslist[pdev->classId].NumEps), 0x03U, 0x01U, 0x01U, 0U);/* Append HID Functional descriptor to Configuration descriptor */
- pHidMouseDesc = ((USBD_HIDDescTypeDef *)(pConf + *Sze));
- pHidMouseDesc->bLength = (uint8_t)sizeof(USBD_HIDDescTypeDef);
- pHidMouseDesc->bDescriptorType = HID_DESCRIPTOR_TYPE;
- pHidMouseDesc->bcdHID = 0x0111U;
- pHidMouseDesc->bCountryCode = 0x00U;
- pHidMouseDesc->bNumDescriptors = 0x01U;
- pHidMouseDesc->bHIDDescriptorType = 0x22U;
- pHidMouseDesc->wItemLength = HID_MOUSE_REPORT_DESC_SIZE;
+ pHidKBMouseDesc = ((USBD_HIDDescTypeDef *)(pConf + *Sze));
+ pHidKBMouseDesc->bLength = (uint8_t)sizeof(USBD_HIDDescTypeDef);
+ pHidKBMouseDesc->bDescriptorType = HID_DESCRIPTOR_TYPE;
+ pHidKBMouseDesc->bcdHID = 0x0111U;
+ pHidKBMouseDesc->bCountryCode = 0x00U;
+ pHidKBMouseDesc->bNumDescriptors = 0x01U;
+ pHidKBMouseDesc->bHIDDescriptorType = 0x22U;
+ pHidKBMouseDesc->wItemLength = HID_KB_MOUSE_REPORT_DESC_SIZE;*Sze += (uint32_t)sizeof(USBD_HIDDescTypeDef);/* Append Endpoint descriptor to Configuration descriptor */__USBD_CMPSIT_SET_EP(pdev->tclasslist[pdev->classId].Eps[0].add, USBD_EP_TYPE_INTR, HID_EPIN_SIZE, \
- HID_HS_BINTERVAL, HID_FS_BINTERVAL);
+ HID_FS_BINTERVAL, HID_FS_BINTERVAL);
+/*增加对输出端点的描述符生成代码*/
+ /* Append Endpoint descriptor to Configuration descriptor */
+ __USBD_CMPSIT_SET_EP(pdev->tclasslist[pdev->classId].Eps[1].add, USBD_EP_TYPE_INTR, HID_EPOUT_SIZE, \
+ HID_FS_BINTERVAL, HID_FS_BINTERVAL);/* Update Config Descriptor and IAD descriptor */((USBD_ConfigDescTypeDef *)pConf)->bNumInterfaces += 1U;
@@ -915,7 +1000,7 @@ static void USBD_CMPSIT_CDCDesc(USBD_HandleTypeDef *pdev, uint32_t pConf, __IOpIadDesc->bFunctionClass = 0x02U;pIadDesc->bFunctionSubClass = 0x02U;pIadDesc->bFunctionProtocol = 0x01U;
- pIadDesc->iFunction = 0U; /* String Index */
+ pIadDesc->iFunction = 2U; /* String Index */*Sze += (uint32_t)sizeof(USBD_IadDescTypeDef);#endif /* USBD_COMPOSITE_USE_IAD == 1 */@@ -1848,8 +1933,8 @@ uint8_t USBD_CMPST_ClearConfDesc(USBD_HandleTypeDef *pdev)UNUSED(pdev);/* Reset the configuration descriptor pointer to default value and its size to zero */
- pCmpstFSConfDesc = USBD_CMPSIT_FSCfgDesc;
- CurrFSConfDescSz = 0U;
+ pCmpstFSConfDesc = USBD_CMPSIT_FSCfgDesc[pdev->id];
+ CurrFSConfDescSz[pdev->id] = 0U;#ifdef USE_USB_HSpCmpstHSConfDesc = USBD_CMPSIT_HSCfgDesc;3.修改代码
修改usbd_hid.h
将鼠标报告的4字节buffer宽度改成16字节，并且增加输出节点端点地址和buffer宽度定义，输出节点用于接收键盘LED状态。声明一个HID接收数据的buffer，这个buffer在usbd_hid.c中定义。
@@ -43,11 +43,15 @@ extern "C" {#ifndef HID_EPIN_ADDR#define HID_EPIN_ADDR 0x81U#endif /* HID_EPIN_ADDR */
-#define HID_EPIN_SIZE 0x04U
+#ifndef HID_EPOUT_ADDR
+#define HID_EPOUT_ADDR 0x01U
+#endif /* HID_EPIN_ADDR */
+#define HID_EPIN_SIZE 0x10U
+#define HID_EPOUT_SIZE 0x08U#define USB_HID_CONFIG_DESC_SIZ 34U#define USB_HID_DESC_SIZ 9U
-#define HID_MOUSE_REPORT_DESC_SIZE 74U
+#define HID_KB_MOUSE_REPORT_DESC_SIZE (76U+65U)#define HID_DESCRIPTOR_TYPE 0x21U#define HID_REPORT_DESC 0x22U
@@ -127,6 +131,7 @@ typedef structextern USBD_ClassTypeDef USBD_HID;#define USBD_HID_CLASS &USBD_HID
+extern uint8_t HidRxBuffer[];修改usbd_hid.c
1.增加out端点打开和关闭的处理过程
2.增加out端点数据接收函数
3.修改鼠标HID描述符，变成键盘鼠标复合设备的HID描述符，并修改相关宏定义
@@ -91,6 +91,7 @@ static uint8_t USBD_HID_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx);static uint8_t USBD_HID_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx);static uint8_t USBD_HID_Setup(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req);static uint8_t USBD_HID_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum);
+static uint8_t USBD_HID_DataOut(USBD_HandleTypeDef *pdev, uint8_t epnum);#ifndef USE_USBD_COMPOSITEstatic uint8_t *USBD_HID_GetFSCfgDesc(uint16_t *length);static uint8_t *USBD_HID_GetHSCfgDesc(uint16_t *length);
@@ -113,7 +114,7 @@ USBD_ClassTypeDef USBD_HID =NULL, /* EP0_TxSent */NULL, /* EP0_RxReady */USBD_HID_DataIn, /* DataIn */
- NULL, /* DataOut */
+ USBD_HID_DataOut, /* DataOut */NULL, /* SOF */NULL,NULL,
@@ -196,7 +197,7 @@ __ALIGN_BEGIN static uint8_t USBD_HID_Desc[USB_HID_DESC_SIZ] __ALIGN_END =0x00, /* bCountryCode: Hardware target country */0x01, /* bNumDescriptors: Number of HID class descriptors to follow */0x22, /* bDescriptorType */
- HID_MOUSE_REPORT_DESC_SIZE, /* wItemLength: Total length of Report descriptor */
+ HID_KB_MOUSE_REPORT_DESC_SIZE, /* wItemLength: Total length of Report descriptor */0x00,};@@ -217,50 +218,87 @@ __ALIGN_BEGIN static uint8_t USBD_HID_DeviceQualifierDesc[USB_LEN_DEV_QUALIFIER_};#endif /* USE_USBD_COMPOSITE */-__ALIGN_BEGIN static uint8_t HID_MOUSE_ReportDesc[HID_MOUSE_REPORT_DESC_SIZE] __ALIGN_END =
+__ALIGN_BEGIN static uint8_t HID_KB_MOUSE_ReportDesc[HID_KB_MOUSE_REPORT_DESC_SIZE] __ALIGN_END ={
- 0x05, 0x01, /* Usage Page (Generic Desktop Ctrls) */
- 0x09, 0x02, /* Usage (Mouse) */
- 0xA1, 0x01, /* Collection (Application) */
- 0x09, 0x01, /* Usage (Pointer) */
- 0xA1, 0x00, /* Collection (Physical) */
- 0x05, 0x09, /* Usage Page (Button) */
- 0x19, 0x01, /* Usage Minimum (0x01) */
- 0x29, 0x03, /* Usage Maximum (0x03) */
- 0x15, 0x00, /* Logical Minimum (0) */
- 0x25, 0x01, /* Logical Maximum (1) */
- 0x95, 0x03, /* Report Count (3) */
- 0x75, 0x01, /* Report Size (1) */
- 0x81, 0x02, /* Input (Data,Var,Abs) */
- 0x95, 0x01, /* Report Count (1) */
- 0x75, 0x05, /* Report Size (5) */
- 0x81, 0x01, /* Input (Const,Array,Abs) */
- 0x05, 0x01, /* Usage Page (Generic Desktop Ctrls) */
- 0x09, 0x30, /* Usage (X) */
- 0x09, 0x31, /* Usage (Y) */
- 0x09, 0x38, /* Usage (Wheel) */
- 0x15, 0x81, /* Logical Minimum (-127) */
- 0x25, 0x7F, /* Logical Maximum (127) */
- 0x75, 0x08, /* Report Size (8) */
- 0x95, 0x03, /* Report Count (3) */
- 0x81, 0x06, /* Input (Data,Var,Rel) */
- 0xC0, /* End Collection */
- 0x09, 0x3C, /* Usage (Motion Wakeup) */
- 0x05, 0xFF, /* Usage Page (Reserved 0xFF) */
- 0x09, 0x01, /* Usage (0x01) */
- 0x15, 0x00, /* Logical Minimum (0) */
- 0x25, 0x01, /* Logical Maximum (1) */
- 0x75, 0x01, /* Report Size (1) */
- 0x95, 0x02, /* Report Count (2) */
- 0xB1, 0x22, /* Feature (Data,Var,Abs,NoWrp) */
- 0x75, 0x06, /* Report Size (6) */
- 0x95, 0x01, /* Report Count (1) */
- 0xB1, 0x01, /* Feature (Const,Array,Abs,NoWrp) */
- 0xC0 /* End Collection */
+ 0x05, 0x01, // USAGE_PAGE (Generic Desktop)
+ 0x09, 0x06, // USAGE (Keyboard)
+ 0xa1, 0x01, // COLLECTION (Application)
+ 0x85, 0x01, // Report ID (1)
+ 0x05, 0x07, // USAGE_PAGE (Keyboard/Keypad)
+ 0x19, 0xe0, // USAGE_MINIMUM (Keyboard LeftControl)
+ 0x29, 0xe7, // USAGE_MAXIMUM (Keyboard Right GUI)
+ 0x15, 0x00, // LOGICAL_MINIMUM (0)
+ 0x25, 0x01, // LOGICAL_MAXIMUM (1)
+ 0x95, 0x08, // REPORT_COUNT (8)
+ 0x75, 0x01, // REPORT_SIZE (1)
+ 0x81, 0x02, // INPUT (Data,Var,Abs)
+ 0x95, 0x01, // REPORT_COUNT (1)
+ 0x75, 0x08, // REPORT_SIZE (8)
+ 0x81, 0x03, // INPUT (Cnst,Var,Abs)
+ 0x95, 0x06, // REPORT_COUNT (6)
+ 0x75, 0x08, // REPORT_SIZE (8)
+ 0x15, 0x00, // LOGICAL_MINIMUM (0)
+ 0x25, 0xFF, // LOGICAL_MAXIMUM (255)
+ 0x19, 0x00, // USAGE_MINIMUM (Reserved (no event indicated))
+ 0x29, 0x65, // USAGE_MAXIMUM (Keyboard Application)
+ 0x81, 0x00, // INPUT (Data,Ary,Abs)
+ 0x25, 0x01, // LOGICAL_MAXIMUM (1)
+ 0x95, 0x03, // REPORT_COUNT (2)
+ 0x75, 0x01, // REPORT_SIZE (1)
+ 0x05, 0x08, // USAGE_PAGE (LEDs)
+ 0x19, 0x01, // USAGE_MINIMUM (Num Lock)
+ 0x29, 0x03, // USAGE_MAXIMUM (Scroll Lock)
+ 0x91, 0x02, // OUTPUT (Data,Var,Abs)
+ 0x95, 0x01, // REPORT_COUNT (1)
+ 0x75, 0x05, // REPORT_SIZE (6)
+ 0x91, 0x03, // OUTPUT (Cnst,Var,Abs)
+ 0xc0, // END_COLLECTION
+ // 65 bytes
+ 0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
+ 0x09, 0x02, // Usage (Mouse)
+ 0xA1, 0x01, // Collection (Application)
+ 0x85, 0x02, // Report ID (2)
+ 0x09, 0x01, // Usage (Pointer)
+ 0xA1, 0x00, // Collection (Physical)
+ 0x05, 0x09, // Usage Page (Button)
+ 0x19, 0x01, // Usage Minimum (0x01)
+ 0x29, 0x03, // Usage Maximum (0x03)
+ 0x15, 0x00, // Logical Minimum (0)
+ 0x25, 0x01, // Logical Maximum (1)
+ 0x95, 0x03, // Report Count (3)
+ 0x75, 0x01, // Report Size (1)
+ 0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+ 0x95, 0x01, // Report Count (1)
+ 0x75, 0x05, // Report Size (5)
+ 0x81, 0x01, // Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
+ 0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
+ 0x09, 0x30, // Usage (X)
+ 0x09, 0x31, // Usage (Y)
+ 0x09, 0x38, // Usage (Wheel)
+ 0x15, 0x81, // Logical Minimum (-127)
+ 0x25, 0x7F, // Logical Maximum (127)
+ 0x75, 0x08, // Report Size (8)
+ 0x95, 0x03, // Report Count (3)
+ 0x81, 0x06, // Input (Data,Var,Rel,No Wrap,Linear,Preferred State,No Null Position)
+ 0xC0, // End Collection
+ 0x09, 0x3C, // Usage (Motion Wakeup)
+ 0x05, 0xFF, // Usage Page (Reserved 0xFF)
+ 0x09, 0x01, // Usage (0x01)
+ 0x15, 0x00, // Logical Minimum (0)
+ 0x25, 0x01, // Logical Maximum (1)
+ 0x75, 0x01, // Report Size (1)
+ 0x95, 0x02, // Report Count (2)
+ 0xB1, 0x22, // Feature (Data,Var,Abs,No Wrap,Linear,No Preferred State,No Null Position,Non-volatile)
+ 0x75, 0x06, // Report Size (6)
+ 0x95, 0x01, // Report Count (1)
+ 0xB1, 0x01, // Feature (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
+ 0xC0, // End Collection
+ // 76 + 65 bytes};+static uint8_t HIDOutEpAdd = HID_EPOUT_ADDR;
+uint8_t HidRxBuffer[8] = {0}; //for keyboard LEDs/*** @}*/
@@ -296,23 +334,32 @@ static uint8_t USBD_HID_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx)#ifdef USE_USBD_COMPOSITE/* Get the Endpoints addresses allocated for this class instance */HIDInEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_IN, USBD_EP_TYPE_INTR, (uint8_t)pdev->classId);
+ HIDOutEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_OUT, USBD_EP_TYPE_INTR, (uint8_t)pdev->classId);#endif /* USE_USBD_COMPOSITE */if (pdev->dev_speed == USBD_SPEED_HIGH){pdev->ep_in[HIDInEpAdd & 0xFU].bInterval = HID_HS_BINTERVAL;
+ pdev->ep_out[HIDOutEpAdd & 0xFU].bInterval = HID_HS_BINTERVAL;
+}else /* LOW and FULL-speed endpoints */{pdev->ep_in[HIDInEpAdd & 0xFU].bInterval = HID_FS_BINTERVAL;
+ pdev->ep_out[HIDOutEpAdd & 0xFU].bInterval = HID_FS_BINTERVAL;}/* Open EP IN */(void)USBD_LL_OpenEP(pdev, HIDInEpAdd, USBD_EP_TYPE_INTR, HID_EPIN_SIZE);pdev->ep_in[HIDInEpAdd & 0xFU].is_used = 1U;
+ (void)USBD_LL_OpenEP(pdev, HIDOutEpAdd, USBD_EP_TYPE_INTR, HID_EPOUT_SIZE);
+ pdev->ep_out[HIDOutEpAdd & 0xFU].is_used = 1U;hhid->state = USBD_HID_IDLE;
/*这句得加上，互联网上所有教程都没有提这里，不加会导致收不到PC下发的LED状态通知收不到*/
+ /* Prepare Out endpoint to receive 1st packet */
+ USBD_LL_PrepareReceive(pdev,HIDOutEpAdd,HidRxBuffer,2);
+return (uint8_t)USBD_OK;}@@ -330,12 +377,16 @@ static uint8_t USBD_HID_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx)#ifdef USE_USBD_COMPOSITE/* Get the Endpoints addresses allocated for this class instance */HIDInEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_IN, USBD_EP_TYPE_INTR, (uint8_t)pdev->classId);
+ HIDOutEpAdd = USBD_CoreGetEPAdd(pdev, USBD_EP_OUT, USBD_EP_TYPE_INTR, (uint8_t)pdev->classId);#endif /* USE_USBD_COMPOSITE *//* Close HID EPs */(void)USBD_LL_CloseEP(pdev, HIDInEpAdd);pdev->ep_in[HIDInEpAdd & 0xFU].is_used = 0U;pdev->ep_in[HIDInEpAdd & 0xFU].bInterval = 0U;
+ (void)USBD_LL_CloseEP(pdev, HIDOutEpAdd);
+ pdev->ep_out[HIDOutEpAdd & 0xFU].is_used = 0U;
+ pdev->ep_out[HIDOutEpAdd & 0xFU].bInterval = 0U;/* Free allocated memory */if (pdev->pClassDataCmsit[pdev->classId] != NULL)
@@ -412,8 +463,8 @@ static uint8_t USBD_HID_Setup(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *recase USB_REQ_GET_DESCRIPTOR:if ((req->wValue >> 8) == HID_REPORT_DESC){
- len = MIN(HID_MOUSE_REPORT_DESC_SIZE, req->wLength);
- pbuf = HID_MOUSE_ReportDesc;
+ len = MIN(HID_KB_MOUSE_REPORT_DESC_SIZE, req->wLength);
+ pbuf = HID_KB_MOUSE_ReportDesc;}else if ((req->wValue >> 8) == HID_DESCRIPTOR_TYPE){
@@ -620,6 +671,20 @@ static uint8_t USBD_HID_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum)return (uint8_t)USBD_OK;}
+/**
+ *USB_HID_DataOut buffer
+ */
+static uint8_t USBD_HID_DataOut (USBD_HandleTypeDef *pdev,
+ uint8_t epnum)
+{
+ USBD_LL_PrepareReceive(pdev,epnum,HidRxBuffer,2);
+ log_printf("USBD_HID_DataOut\r\n");
+ /* Ensure that the FIFO is empty before a new transfer, this condition could
+ be caused by a new transfer before the end of the previous transfer */
+ ((USBD_HID_HandleTypeDef *)pdev->pClassDataCmsit[pdev->classId])->state = USBD_HID_IDLE;
+ return USBD_OK;
+}
+
usbd_device.c
这里就看出使用ST官方提供的代码的好处，我们要构建一个复合设备，只需要在这里连续注册两次就可以了。
@@ -28,7 +28,7 @@#include "usbd_hid.h"/* USER CODE BEGIN Includes */
-
+#include "usbd_composite_builder.h"/* USER CODE END Includes *//* USER CODE BEGIN PV */
@@ -43,7 +43,11 @@/* USB Device Core handle declaration. */USBD_HandleTypeDef hUsbDeviceFS;
+uint8_t epnums_CDC_FS[] = {0x81U, 0x01U, 0x82U};
+uint8_t epnums_HID_FS[] = {0x83U, 0x03U};/** -- Insert your variables declaration here --
@@ -74,14 +78,32 @@ void MX_USB_DEVICE_Init(void){Error_Handler();}
- if (USBD_RegisterClass(&hUsbDeviceFS, &USBD_HID) != USBD_OK)
+ if (USBD_RegisterClassComposite(&hUsbDeviceFS, &USBD_CDC, CLASS_TYPE_CDC, &epnums_CDC_FS[0]) != USBD_OK)
+ {
+ Error_Handler();
+ }
+ hUsbDeviceFS.classId--;
+ if (USBD_CDC_RegisterInterface(&hUsbDeviceFS, &USBD_Interface_fops_FS) != USBD_OK)
+ {
+ Error_Handler();
+ }
+ hUsbDeviceFS.classId++;
+ if (USBD_RegisterClassComposite(&hUsbDeviceFS, &USBD_HID, CLASS_TYPE_HID, &epnums_HID_FS[0]) != USBD_OK){Error_Handler();
+// if (USBD_RegisterClass(&hUsbDeviceFS, &USBD_HID) != USBD_OK)
+// {
+// Error_Handler();
+// }if (USBD_Start(&hUsbDeviceFS) != USBD_OK){Error_Handler();
usbd_desc.c
修改配置描述符，设置成符合设备类。
@@ -156,9 +156,9 @@ __ALIGN_BEGIN uint8_t USBD_FS_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END =USB_DESC_TYPE_DEVICE, /*bDescriptorType*/0x00, /*bcdUSB */0x02,
- 0x00, /*bDeviceClass*/
- 0x00, /*bDeviceSubClass*/
- 0x00, /*bDeviceProtocol*/
+ 0xEF, /*bDeviceClass*/
+ 0x02, /*bDeviceSubClass*/
+ 0x01, /*bDeviceProtocol*/USB_MAX_EP0_SIZE, /*bMaxPacketSize*/LOBYTE(USBD_VID), /*idVendor*/HIBYTE(USBD_VID), /*idVendor*/
修改usbd_conf.c
由于我们使用到端点3，默认工程中是没有给端点3设置fifo的，所以加上。
@@ -24,6 +24,7 @@#include "usbd_def.h"#include "usbd_core.h"#include "usbd_hid.h"
+#include "usbd_cdc.h"/* USER CODE BEGIN Includes */@@ -423,7 +424,9 @@ USBD_StatusTypeDef USBD_LL_Init(USBD_HandleTypeDef *pdev)/* USER CODE BEGIN TxRx_Configuration */HAL_PCDEx_SetRxFiFo(&hpcd_USB_OTG_FS, 0x80);HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 0, 0x40);
- HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 1, 0x80);
+ HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 1, 0x40);
+ HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 3, 0x40);/* USER CODE END TxRx_Configuration */}if (pdev->id == DEVICE_HS) {
当我们使用复合设备时，下面这个函数也要改一下，裸机代码中没法动态分配内存，只能使用静态变量空间替换一下。初始程序中只支持一个设备，空间不够，我们需要把它扩容一下。
void *USBD_static_malloc(uint32_t size){
- UNUSED(size);
- static uint32_t mem[(sizeof(USBD_HID_HandleTypeDef)/4)+1];/* On 32-bit boundary */
- return mem;
+// UNUSED(size);
+ static uint32_t pcurmempos=0;
+ static uint32_t usedmemsz=0;
+ static uint32_t mem[(sizeof(USBD_HID_HandleTypeDef)+sizeof(USBD_CDC_HandleTypeDef))/4+1];/* On 32-bit boundary */
+ pcurmempos = usedmemsz;
+ usedmemsz += size/4;
+ return &mem[pcurmempos];}具体的代码改动没法全部贴出来，但是所有要改动的点都点到了。过程中在互联网上搜了大量资料，要么太旧，要么不全或者说的不清不楚。所以还是自己摸索了一遍，把过程记录在这里做个备忘。
