stm32 USB增加端點總結（端點用法）

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在原有的端點1和端點2基礎上增加一個雙向端點3.

由于EP3端點緩沖區只有512-32-64*7=32字節大小，所以發送長度不能大于32，否則多余的數據會丟失

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1. 修改usb_desc.c

?1）將端點數目改為6?

? /************** Descriptor of Custom HID interface ****************//* 09 */0x09,???????? /* bLength: Interface Descriptor size */USB_INTERFACE_DESCRIPTOR_TYPE,/* bDescriptorType: Interface descriptor type */0x00,???????? /* bInterfaceNumber: Number of Interface */0x00,???????? /* bAlternateSetting: Alternate setting */0x06,???????? /* bNumEndpoints */0xDC,???????? /* bInterfaceClass: Class code = 0DCH */0xA0,???????? /* bInterfaceSubClass : Subclass code = 0A0H */0xB0,???????? /* nInterfaceProtocol : Protocol code = 0B0H */0,??????????? /* iInterface: Index of string descriptor */

2）增加端點描述符

??? 0x07,???????? /* endpoint descriptor length = 07H */USB_ENDPOINT_DESCRIPTOR_TYPE, /* endpoint descriptor type = 05H */0x83,???????? /* endpoint 2 IN */0x02,????????????????????????????????????????????? /* bulk transfer = 02H */0x40,0x00,??? /* endpoint max packet size = 0040H */0x0A,???????? /* the value is invalid when bulk transfer */0x07,???????? /* endpoint descriptor length = 07H */USB_ENDPOINT_DESCRIPTOR_TYPE, /* endpoint descriptor type = 05H */0x03,???????? /* endpoint 2 OUT */0x02,????????????????????????????????????????????? /* bulk transfer = 02H */0x40,0x00,??? /* endpoint max packet size = 0040H */0x0A,???????? /* the value is invalid when bulk transfer */

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2. 修改usb_prop.c

1）在void CustomHID_Reset(void)中初始化端點3

? /* Initialize Endpoint 3 */SetEPType(ENDP3, EP_BULK);SetEPRxAddr(ENDP3, ENDP3_RXADDR);SetEPTxAddr(ENDP3, ENDP3_TXADDR);SetEPRxCount(ENDP3, EP_SIZE);SetEPRxStatus(ENDP3, EP_RX_VALID);SetEPTxStatus(ENDP3, EP_TX_NAK);

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3. 修改usb_conf.h

1）將端點書改為4

#define EP_NUM???? (4)

2）修改端點緩沖地址

/* buffer table base address */#define BTABLE_ADDRESS?? ???(0x00)/* EP0? *//* rx/tx buffer base address */#define ENDP0_RXADDR??????? (0x20)? //4*8=0x20,參照有道筆記“STM32 USB端點修改”#define ENDP0_TXADDR??????? (0x60)/* EP1? *//* tx buffer base address *///地址為32位對其,位4的倍數，不能超過 bMaxPacketSize//EP1#define ENDP1_RXADDR??????? (0xa0)? //每個緩沖區大小64#define ENDP1_TXADDR??????? (0xa0+64)EP2#define ENDP2_RXADDR??????? (0xa0+64+64)#define ENDP2_TXADDR??????? (0xa0+64+64+64)EP3#define ENDP3_RXADDR??????? (0xa0+64+64+64+64)#define ENDP3_TXADDR??????? (0xa0+64+64+64+64+64)

3）注釋回調函數

//#define? EP3_IN_Callback?? NOP_Process//#define? EP3_OUT_Callback?? NOP_Process

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4. 修改usb_endp.c

1）在void EP3_OUT_Callback(void)中實現usb接收數據處理

2）void EP3_IN_Callback(void)可不用實現

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5. 修改usbio.c

1）封裝上層接收與發送接口

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總結

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