GD32F407实现usb通讯

#include "gd32f4xx.h"
#include "usbd_core.h"
#include "usbd_cdc_rtx.h"

// USB传输缓冲区大小
#define BUFFER_SIZE 64

// USB设备端口配置
#define USB_CORE_RX_PORT GPIOA
#define USB_CORE_RX_PIN GPIO_PIN_11
#define USB_CORE_TX_PORT GPIOA
#define USB_CORE_TX_PIN GPIO_PIN_12

static uint8_t usbReceiveBuffer[BUFFER_SIZE];
static uint8_t usbTransmitBuffer[BUFFER_SIZE];

void usbCdcDataReceived(uint8_t *data, uint32_t length)
{
    // 在这里处理接收到的USB数据
    // 可以将数据发送回上位机或进行其他操作
    usbSendData(data, length);
}

usbd_cdc_cb_struct cdcCallbacks = {
    .data_received = usbCdcDataReceived
};

void usbInterruptHandler(void)
{
    usbd_polling(&USB_OTG_dev);
}

void usbInit(void)
{
    nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3);
    rcu_pll48m_clock_config(RCU_PLL