diff options
Diffstat (limited to 'port/fsdev/usb_dc_fsdev.c')
| -rw-r--r-- | port/fsdev/usb_dc_fsdev.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/port/fsdev/usb_dc_fsdev.c b/port/fsdev/usb_dc_fsdev.c index 3e1fa22b..eb8dde24 100644 --- a/port/fsdev/usb_dc_fsdev.c +++ b/port/fsdev/usb_dc_fsdev.c @@ -60,10 +60,30 @@ __WEAK void usb_dc_low_level_deinit(void) { } +/** + * @brief Initialize the USB device controller. + * @param busid USB bus index (fsdev supports a single instance, bus 0). + * @retval 0 on success. + */ int usb_dc_init(uint8_t busid) { usb_dc_low_level_init(); +#if defined(N32H4X_FSDEV) + /* N32H4x power-on sequence: the USB_CTRL reset value is 0x0300 + * -- PD(bit9, power-down) and FRST(bit8, force-reset) are both set. + * 1. Clear PD, wait for the internal analog voltage reference to settle. + * 2. Clear FRST. + * 3. Clear the STS register to drop pending interrupts. */ + USB->CNTR &= (uint32_t)~USB_CNTR_PDWN; /* exit power-down */ + + /* Wait for the internal reference voltage to stabilise. */ + for (volatile uint32_t i = 0U; i < 1000U; i++) { + } + + USB->CNTR &= (uint32_t)~USB_CNTR_FRES; /* clear force-reset flag */ + USB->ISTR = 0U; /* clear pending interrupts */ +#else /* Init Device */ /* CNTR_FRES = 1 */ USB->CNTR = (uint16_t)USB_CNTR_FRES; @@ -73,6 +93,7 @@ int usb_dc_init(uint8_t busid) /* Clear pending interrupts */ USB->ISTR = 0U; +#endif /*Set Btable Address*/ USB->BTABLE = BTABLE_ADDRESS; @@ -91,8 +112,13 @@ int usb_dc_init(uint8_t busid) /* Set interrupt mask */ USB->CNTR = (uint16_t)winterruptmask; +#if defined(N32H4X_FSDEV) + /* Enabling DP Pull-UP through USB_CTRL.PU */ + USB->CNTR |= (uint32_t)USB_CNTR_PU; +#else /* Enabling DP Pull-UP bit to Connect internal PU resistor on USB DP line */ USB->BCDR |= (uint16_t)USB_BCDR_DPPU; +#endif return 0; } @@ -325,6 +351,10 @@ int usbd_ep_start_read(uint8_t busid, const uint8_t ep, uint8_t *data, uint32_t return 0; } +/** + * @brief USB FS device interrupt handler: dispatches ISTR events. + * @param busid USB bus index (fsdev supports a single instance, bus 0). + */ void USBD_IRQHandler(uint8_t busid) { uint16_t wIstr, wEPVal; @@ -339,7 +369,13 @@ void USBD_IRQHandler(uint8_t busid) wIstr = USB->ISTR; /* extract highest priority endpoint number */ +#if defined(N32H4X_FSDEV) + /* EP_ID is at STS bits [11:8] */ + ep_idx = (uint8_t)((wIstr & USB_ISTR_EP_ID) >> USB_ISTR_EP_ID_Pos); +#else + /* ST: EP_ID is at ISTR bits [3:0] */ ep_idx = (uint8_t)(wIstr & USB_ISTR_EP_ID); +#endif if (ep_idx == 0U) { if ((wIstr & USB_ISTR_DIR) == 0U) { |