Foreword
GD32F450使用官方的库的时候USB可以正常使用，但是使用CubeMX的时候USB无法正常工作。
现象
使用CubeMX，STM32F429直接生成USB Device设备，比如HID或者虚拟串口，都无法直接工作，连电脑直接没反应。
但是如果使用GD官方库的usb例程，比如键盘啊，u盘啊什么的，都可以正常工作。那肯定不是硬件问题了。
时钟不同
首先怀疑时钟有问题，由于GD本身多给了USB一个可选时钟源，如果是STM32F429直接跑180M，那USB肯定不能正常工作，但是这种不正常USB连接电脑时会有提示，而现在是任何提示都没有，感觉就像没连接一样。
/*!
\brief configure USB clock
\param[in] none
\param[out] none
\retval none
*/
void usb_rcu_config(void)
{
#ifdef USE_USB_FS
#ifndef USE_IRC48M
rcu_pll48m_clock_config(RCU_PLL48MSRC_PLLQ);
rcu_ck48m_clock_config(RCU_CK48MSRC_PLL48M);
#else
/* enable IRC48M clock */
rcu_osci_on(RCU_IRC48M);
/* wait till IRC48M is ready */
while (SUCCESS != rcu_osci_stab_wait(RCU_IRC48M)) {
}
rcu_ck48m_clock_config(RCU_CK48MSRC_IRC48M);
#endif /* USE_IRC48M */
rcu_periph_clock_enable(RCU_USBFS);
#elif defined(USE_USB_HS)
#ifdef USE_EMBEDDED_PHY
#ifndef USE_IRC48M
rcu_pll48m_clock_config(RCU_PLL48MSRC_PLLQ);
rcu_ck48m_clock_config(RCU_CK48MSRC_PLL48M);
#else
/* enable IRC48M clock */
rcu_osci_on(RCU_IRC48M);
/* wait till IRC48M is ready */
while (SUCCESS != rcu_osci_stab_wait(RCU_IRC48M)) {
}
rcu_ck48m_clock_config(RCU_CK48MSRC_IRC48M);
#endif /* USE_IRC48M */
#elif defined(USE_ULPI_PHY)
rcu_periph_clock_enable(RCU_USBHSULPI);
#endif /* USE_EMBEDDED_PHY */
rcu_periph_clock_enable(RCU_USBHS);
#endif /* USB_USBFS */
}
时钟上主要是这里设置一下时钟源和频率，但是如果不设置其实默认就是这样的，那也没错。
其实分析到这里就卡壳了，发现USB直接就不工作，如果不仔细分析GD库的底层代码根本不可能发现这里的问题。
不过我是看到了别人的帖子，遇到了一样的问题，直接拿到了答案，所以还是记录一下这里的问题。
https://bbs.21ic.com/forum.php?mod=viewthread&tid=3122092&highlight=gd32%2Busb
USBFS_GCCFG
usb_status usb_core_init (usb_core_basic usb_basic, usb_core_regs *usb_regs)
{
if (USB_ULPI_PHY == usb_basic.phy_itf) {
usb_regs->gr->GCCFG &= ~GCCFG_PWRON;
if (usb_basic.sof_enable) {
usb_regs->gr->GCCFG |= GCCFG_SOFOEN;
}
/* initialize the ULPI interface */
usb_regs->gr->GUSBCS &= ~(GUSBCS_EMBPHY | GUSBCS_ULPIEOI);
#ifdef USBHS_EXTERNAL_VBUS_ENABLED
/* use external VBUS driver */
usb_regs->gr->GUSBCS |= GUSBCS_ULPIEVD;
#else
/* use internal VBUS driver */
usb_regs->gr->GUSBCS &= ~GUSBCS_ULPIEVD;
#endif /* USBHS_EXTERNAL_VBUS_ENABLED */
/* soft reset the core */
usb_core_reset (usb_regs);
} else {
usb_regs->gr->GUSBCS |= GUSBCS_EMBPHY;
/* soft reset the core */
usb_core_reset (usb_regs);
/* active the transceiver and enable VBUS sensing */
usb_regs->gr->GCCFG |= GCCFG_PWRON | GCCFG_VBUSACEN | GCCFG_VBUSBCEN;
#ifndef VBUS_SENSING_ENABLED
usb_regs->gr->GCCFG |= GCCFG_VBUSIG;
#endif /* VBUS_SENSING_ENABLED */
从GD的库里可以看到，虽然没有用VBUS，但是他却把VBUS给使能了。
对应到ST的HAL库这里
HAL_StatusTypeDef USB_DevInit(USB_OTG_GlobalTypeDef *USBx, USB_OTG_CfgTypeDef cfg)
{
HAL_StatusTypeDef ret = HAL_OK;
uint32_t USBx_BASE = (uint32_t)USBx;
uint32_t i;
for (i = 0U; i < 15U; i++)
{
USBx->DIEPTXF[i] = 0U;
}
#if defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx) || defined(STM32F412Rx) || defined(STM32F412Cx) || defined(STM32F413xx) || defined(STM32F423xx)
/* VBUS Sensing setup */
if (cfg.vbus_sensing_enable == 0U)
{
USBx_DEVICE->DCTL |= USB_OTG_DCTL_SDIS;
/* Deactivate VBUS Sensing B */
USBx->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
/* B-peripheral session valid override enable */
USBx->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
USBx->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
}
else
{
/* Enable HW VBUS sensing */
USBx->GCCFG |= USB_OTG_GCCFG_VBDEN;
}
#else
/* VBUS Sensing setup */
if (cfg.vbus_sensing_enable == 0U)
{
/*
* Disable HW VBUS sensing. VBUS is internally considered to be always
* at VBUS-Valid level (5V).
*/
USBx_DEVICE->DCTL |= USB_OTG_DCTL_SDIS;
USBx->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS;
USBx->GCCFG &= ~USB_OTG_GCCFG_VBUSBSEN;
USBx->GCCFG &= ~USB_OTG_GCCFG_VBUSASEN;
}
else
{
/* Enable HW VBUS sensing */
USBx->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
USBx->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
}
#endif /* defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx) || defined(STM32F412Rx) || defined(STM32F412Cx) || defined(STM32F413xx) || defined(STM32F423xx) */
// 我后加的这两句
USBx->GCCFG |= USB_OTG_GCCFG_VBUSBSEN;
USBx->GCCFG |= USB_OTG_GCCFG_VBUSASEN;
/* Restart the Phy Clock */
USBx_PCGCCTL = 0U;
/* Device mode configuration */
USBx_DEVICE->DCFG |= DCFG_FRAME_INTERVAL_80;
if (cfg.phy_itface == USB_OTG_ULPI_PHY)
{
if (cfg.speed == USBD_HS_SPEED)
{
/* Set Core speed to High speed mode */
(void)USB_SetDevSpeed(USBx, USB_OTG_SPEED_HIGH);
}
else
{
/* Set Core speed to Full speed mode */
(void)USB_SetDevSpeed(USBx, USB_OTG_SPEED_HIGH_IN_FULL);
}
}
else
{
/* Set Core speed to Full speed mode */
(void)USB_SetDevSpeed(USBx, USB_OTG_SPEED_FULL);
}
/* Flush the FIFOs */
if (USB_FlushTxFifo(USBx, 0x10U) != HAL_OK) /* all Tx FIFOs */
{
ret = HAL_ERROR;
}
if (USB_FlushRxFifo(USBx) != HAL_OK)
{
ret = HAL_ERROR;
}
/* Clear all pending Device Interrupts */
USBx_DEVICE->DIEPMSK = 0U;
USBx_DEVICE->DOEPMSK = 0U;
USBx_DEVICE->DAINTMSK = 0U;
for (i = 0U; i < cfg.dev_endpoints; i++)
{
if ((USBx_INEP(i)->DIEPCTL & USB_OTG_DIEPCTL_EPENA) == USB_OTG_DIEPCTL_EPENA)
{
if (i == 0U)
{
USBx_INEP(i)->DIEPCTL = USB_OTG_DIEPCTL_SNAK;
}
else
{
USBx_INEP(i)->DIEPCTL = USB_OTG_DIEPCTL_EPDIS | USB_OTG_DIEPCTL_SNAK;
}
}
else
{
USBx_INEP(i)->DIEPCTL = 0U;
}
USBx_INEP(i)->DIEPTSIZ = 0U;
USBx_INEP(i)->DIEPINT = 0xFB7FU;
}
for (i = 0U; i < cfg.dev_endpoints; i++)
{
if ((USBx_OUTEP(i)->DOEPCTL & USB_OTG_DOEPCTL_EPENA) == USB_OTG_DOEPCTL_EPENA)
{
if (i == 0U)
{
USBx_OUTEP(i)->DOEPCTL = USB_OTG_DOEPCTL_SNAK;
}
else
{
USBx_OUTEP(i)->DOEPCTL = USB_OTG_DOEPCTL_EPDIS | USB_OTG_DOEPCTL_SNAK;
}
}
else
{
USBx_OUTEP(i)->DOEPCTL = 0U;
}
USBx_OUTEP(i)->DOEPTSIZ = 0U;
USBx_OUTEP(i)->DOEPINT = 0xFB7FU;
}
USBx_DEVICE->DIEPMSK &= ~(USB_OTG_DIEPMSK_TXFURM);
/* Disable all interrupts. */
USBx->GINTMSK = 0U;
/* Clear any pending interrupts */
USBx->GINTSTS = 0xBFFFFFFFU;
/* Enable the common interrupts */
if (cfg.dma_enable == 0U)
{
USBx->GINTMSK |= USB_OTG_GINTMSK_RXFLVLM;
}
/* Enable interrupts matching to the Device mode ONLY */
USBx->GINTMSK |= USB_OTG_GINTMSK_USBSUSPM | USB_OTG_GINTMSK_USBRST |
USB_OTG_GINTMSK_ENUMDNEM | USB_OTG_GINTMSK_IEPINT |
USB_OTG_GINTMSK_OEPINT | USB_OTG_GINTMSK_IISOIXFRM |
USB_OTG_GINTMSK_PXFRM_IISOOXFRM | USB_OTG_GINTMSK_WUIM;
if (cfg.Sof_enable != 0U)
{
USBx->GINTMSK |= USB_OTG_GINTMSK_SOFM;
}
if (cfg.vbus_sensing_enable == 1U)
{
USBx->GINTMSK |= (USB_OTG_GINTMSK_SRQIM | USB_OTG_GINTMSK_OTGINT);
}
return ret;
}
st正常情况下不使用VUBS自然也不可能设置这两位，但是为了适配GD需要强行使能。
USBFS_DSTAT
| 地址偏移 | ST | GD |
|---|---|---|
| 0x808 | OTG_FS_DSTS | USBFS_DSTAT |
BIT3在ST中不稳定误差的显示，而GD中保留
BIT0 在ST中没有明确说到底0是挂起还是非挂起，但是从代码里看到，1是挂起，0是没挂起
void HAL_PCD_SuspendCallback(PCD_HandleTypeDef *hpcd)
#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
{
// 这个回调说明，是等于1的时候是suspend mode
/* Inform USB library that core enters in suspend Mode. */
USBD_LL_Suspend((USBD_HandleTypeDef*)hpcd->pData);
__HAL_PCD_GATE_PHYCLOCK(hpcd);
/* Enter in STOP mode. */
而GD这里是相反的，GD明确说了0是挂起状态，1是非挂起状态 一定要注意，库里这个地方设置的是相反的。
void HAL_PCD_IRQHandler(PCD_HandleTypeDef *hpcd)
{
USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;
uint32_t USBx_BASE = (uint32_t)USBx;
uint32_t i, ep_intr, epint, epnum;
uint32_t fifoemptymsk, temp;
USB_OTG_EPTypeDef *ep;
/* ensure that we are in device mode */
if (USB_GetMode(hpcd->Instance) == USB_OTG_MODE_DEVICE)
{
/* avoid spurious interrupt */
if (__HAL_PCD_IS_INVALID_INTERRUPT(hpcd))
{
return;
}
if (__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_MMIS))
{
/* incorrect mode, acknowledge the interrupt */
__HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_MMIS);
}
/* Handle RxQLevel Interrupt */
if (__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_RXFLVL))
{
USB_MASK_INTERRUPT(hpcd->Instance, USB_OTG_GINTSTS_RXFLVL);
temp = USBx->GRXSTSP;
ep = &hpcd->OUT_ep[temp & USB_OTG_GRXSTSP_EPNUM];
if (((temp & USB_OTG_GRXSTSP_PKTSTS) >> 17) == STS_DATA_UPDT)
{
if ((temp & USB_OTG_GRXSTSP_BCNT) != 0U)
{
(void)USB_ReadPacket(USBx, ep->xfer_buff,
(uint16_t)((temp & USB_OTG_GRXSTSP_BCNT) >> 4));
ep->xfer_buff += (temp & USB_OTG_GRXSTSP_BCNT) >> 4;
ep->xfer_count += (temp & USB_OTG_GRXSTSP_BCNT) >> 4;
}
}
else if (((temp & USB_OTG_GRXSTSP_PKTSTS) >> 17) == STS_SETUP_UPDT)
{
(void)USB_ReadPacket(USBx, (uint8_t *)hpcd->Setup, 8U);
ep->xfer_count += (temp & USB_OTG_GRXSTSP_BCNT) >> 4;
}
else
{
/* ... */
}
USB_UNMASK_INTERRUPT(hpcd->Instance, USB_OTG_GINTSTS_RXFLVL);
}
if (__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_OEPINT))
{
epnum = 0U;
/* Read in the device interrupt bits */
ep_intr = USB_ReadDevAllOutEpInterrupt(hpcd->Instance);
while (ep_intr != 0U)
{
if ((ep_intr & 0x1U) != 0U)
{
epint = USB_ReadDevOutEPInterrupt(hpcd->Instance, (uint8_t)epnum);
if ((epint & USB_OTG_DOEPINT_XFRC) == USB_OTG_DOEPINT_XFRC)
{
CLEAR_OUT_EP_INTR(epnum, USB_OTG_DOEPINT_XFRC);
(void)PCD_EP_OutXfrComplete_int(hpcd, epnum);
}
if ((epint & USB_OTG_DOEPINT_STUP) == USB_OTG_DOEPINT_STUP)
{
CLEAR_OUT_EP_INTR(epnum, USB_OTG_DOEPINT_STUP);
/* Class B setup phase done for previous decoded setup */
(void)PCD_EP_OutSetupPacket_int(hpcd, epnum);
}
if ((epint & USB_OTG_DOEPINT_OTEPDIS) == USB_OTG_DOEPINT_OTEPDIS)
{
CLEAR_OUT_EP_INTR(epnum, USB_OTG_DOEPINT_OTEPDIS);
}
/* Clear Status Phase Received interrupt */
if ((epint & USB_OTG_DOEPINT_OTEPSPR) == USB_OTG_DOEPINT_OTEPSPR)
{
CLEAR_OUT_EP_INTR(epnum, USB_OTG_DOEPINT_OTEPSPR);
}
/* Clear OUT NAK interrupt */
if ((epint & USB_OTG_DOEPINT_NAK) == USB_OTG_DOEPINT_NAK)
{
CLEAR_OUT_EP_INTR(epnum, USB_OTG_DOEPINT_NAK);
}
}
epnum++;
ep_intr >>= 1U;
}
}
if (__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_IEPINT))
{
/* Read in the device interrupt bits */
ep_intr = USB_ReadDevAllInEpInterrupt(hpcd->Instance);
epnum = 0U;
while (ep_intr != 0U)
{
if ((ep_intr & 0x1U) != 0U) /* In ITR */
{
epint = USB_ReadDevInEPInterrupt(hpcd->Instance, (uint8_t)epnum);
if ((epint & USB_OTG_DIEPINT_XFRC) == USB_OTG_DIEPINT_XFRC)
{
fifoemptymsk = (uint32_t)(0x1UL << (epnum & EP_ADDR_MSK));
USBx_DEVICE->DIEPEMPMSK &= ~fifoemptymsk;
CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_XFRC);
if (hpcd->Init.dma_enable == 1U)
{
hpcd->IN_ep[epnum].xfer_buff += hpcd->IN_ep[epnum].maxpacket;
/* this is ZLP, so prepare EP0 for next setup */
if ((epnum == 0U) && (hpcd->IN_ep[epnum].xfer_len == 0U))
{
/* prepare to rx more setup packets */
(void)USB_EP0_OutStart(hpcd->Instance, 1U, (uint8_t *)hpcd->Setup);
}
}
#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
hpcd->DataInStageCallback(hpcd, (uint8_t)epnum);
#else
HAL_PCD_DataInStageCallback(hpcd, (uint8_t)epnum);
#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
}
if ((epint & USB_OTG_DIEPINT_TOC) == USB_OTG_DIEPINT_TOC)
{
CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_TOC);
}
if ((epint & USB_OTG_DIEPINT_ITTXFE) == USB_OTG_DIEPINT_ITTXFE)
{
CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_ITTXFE);
}
if ((epint & USB_OTG_DIEPINT_INEPNE) == USB_OTG_DIEPINT_INEPNE)
{
CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_INEPNE);
}
if ((epint & USB_OTG_DIEPINT_EPDISD) == USB_OTG_DIEPINT_EPDISD)
{
CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_EPDISD);
}
if ((epint & USB_OTG_DIEPINT_TXFE) == USB_OTG_DIEPINT_TXFE)
{
(void)PCD_WriteEmptyTxFifo(hpcd, epnum);
}
}
epnum++;
ep_intr >>= 1U;
}
}
/* Handle Resume Interrupt */
if (__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_WKUINT))
{
/* Clear the Remote Wake-up Signaling */
USBx_DEVICE->DCTL &= ~USB_OTG_DCTL_RWUSIG;
if (hpcd->LPM_State == LPM_L1)
{
hpcd->LPM_State = LPM_L0;
#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
hpcd->LPMCallback(hpcd, PCD_LPM_L0_ACTIVE);
#else
HAL_PCDEx_LPM_Callback(hpcd, PCD_LPM_L0_ACTIVE);
#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
}
else
{
#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
hpcd->ResumeCallback(hpcd);
#else
HAL_PCD_ResumeCallback(hpcd);
#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
}
__HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_WKUINT);
}
/* Handle Suspend Interrupt */
if (__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_USBSUSP))
{
// 这里是我修改后的
if ((USBx_DEVICE->DSTS & USB_OTG_DSTS_SUSPSTS) != USB_OTG_DSTS_SUSPSTS)
{
#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
hpcd->SuspendCallback(hpcd);
#else
HAL_PCD_SuspendCallback(hpcd);
#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
}
__HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_USBSUSP);
}
除了这个地方还有一个也需要改，唤醒这里也需要修改为不相等，否则会出现USB插电脑有反应，但是获取描述符失败。
/**
* @brief USB_ActivateRemoteWakeup active remote wakeup signalling
* @param USBx Selected device
* @retval HAL status
*/
HAL_StatusTypeDef USB_ActivateRemoteWakeup(USB_OTG_GlobalTypeDef *USBx)
{
uint32_t USBx_BASE = (uint32_t)USBx;
if ((USBx_DEVICE->DSTS & USB_OTG_DSTS_SUSPSTS) != USB_OTG_DSTS_SUSPSTS)
{
/* active Remote wakeup signalling */
USBx_DEVICE->DCTL |= USB_OTG_DCTL_RWUSIG;
}
return HAL_OK;
}
Summary
这个问题直接搜还搜不到，必须得论坛内搜，才能看到这个帖子，我之前已经调了2天，没找到原因。
论坛里随手搜了一下，没想到竟然遇到了一模一样的问题，省了好多功夫。
如果不知道的情况下，就得去GD底层库一点点看，一点点对比了，那花的时间可就太多了。
而且看贴子里基本都是说不兼容，不能用，如果不坚持看下去肯定就放弃，转而使用GD自己的库了。
Quote
https://bbs.21ic.com/forum.php?mod=viewthread&tid=3122092&highlight=gd32%2Busb