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79 lines
2.8 KiB
79 lines
2.8 KiB
#include "llusb_declarations.h"
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USB_OTG_GlobalTypeDef *USBx = USB_OTG_HS;
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static void OTG_HS_IRQ_Handler(void) {
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NVIC_DisableIRQ(OTG_HS_IRQn);
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usb_irqhandler();
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NVIC_EnableIRQ(OTG_HS_IRQn);
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}
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void usb_init(void) {
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REGISTER_INTERRUPT(OTG_HS_IRQn, OTG_HS_IRQ_Handler, 1500000U, FAULT_INTERRUPT_RATE_USB) // TODO: Find out a better rate limit for USB. Now it's the 1.5MB/s rate
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// Disable global interrupt
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USBx->GAHBCFG &= ~(USB_OTG_GAHBCFG_GINT);
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// Select FS Embedded PHY
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USBx->GUSBCFG |= USB_OTG_GUSBCFG_PHYSEL;
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// Force device mode
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USBx->GUSBCFG &= ~(USB_OTG_GUSBCFG_FHMOD | USB_OTG_GUSBCFG_FDMOD);
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USBx->GUSBCFG |= USB_OTG_GUSBCFG_FDMOD;
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delay(250000); // Wait for about 25ms (explicitly stated in H7 ref manual)
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// Wait for AHB master IDLE state.
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while ((USBx->GRSTCTL & USB_OTG_GRSTCTL_AHBIDL) == 0U);
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// Core Soft Reset
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USBx->GRSTCTL |= USB_OTG_GRSTCTL_CSRST;
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while ((USBx->GRSTCTL & USB_OTG_GRSTCTL_CSRST) == USB_OTG_GRSTCTL_CSRST);
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// Activate the USB Transceiver
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USBx->GCCFG |= USB_OTG_GCCFG_PWRDWN;
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for (uint8_t i = 0U; i < 15U; i++) {
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USBx->DIEPTXF[i] = 0U;
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}
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// VBUS Sensing setup
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USBx_DEVICE->DCTL |= USB_OTG_DCTL_SDIS;
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// Deactivate VBUS Sensing B
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USBx->GCCFG &= ~(USB_OTG_GCCFG_VBDEN);
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// B-peripheral session valid override enable
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USBx->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
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USBx->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
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// Restart the Phy Clock
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USBx_PCGCCTL = 0U;
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// Device mode configuration
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USBx_DEVICE->DCFG |= DCFG_FRAME_INTERVAL_80;
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USBx_DEVICE->DCFG |= USB_OTG_SPEED_FULL | USB_OTG_DCFG_NZLSOHSK;
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// Flush FIFOs
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USBx->GRSTCTL = (USB_OTG_GRSTCTL_TXFFLSH | (0x10U << 6));
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while ((USBx->GRSTCTL & USB_OTG_GRSTCTL_TXFFLSH) == USB_OTG_GRSTCTL_TXFFLSH);
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USBx->GRSTCTL = USB_OTG_GRSTCTL_RXFFLSH;
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while ((USBx->GRSTCTL & USB_OTG_GRSTCTL_RXFFLSH) == USB_OTG_GRSTCTL_RXFFLSH);
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// Clear all pending Device Interrupts
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USBx_DEVICE->DIEPMSK = 0U;
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USBx_DEVICE->DOEPMSK = 0U;
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USBx_DEVICE->DAINTMSK = 0U;
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USBx_DEVICE->DIEPMSK &= ~(USB_OTG_DIEPMSK_TXFURM);
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// Disable all interrupts.
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USBx->GINTMSK = 0U;
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// Clear any pending interrupts
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USBx->GINTSTS = 0xBFFFFFFFU;
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// Enable interrupts matching to the Device mode ONLY
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USBx->GINTMSK = USB_OTG_GINTMSK_USBRST | USB_OTG_GINTMSK_ENUMDNEM | USB_OTG_GINTMSK_OTGINT |
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USB_OTG_GINTMSK_RXFLVLM | USB_OTG_GINTMSK_GONAKEFFM | USB_OTG_GINTMSK_GINAKEFFM |
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USB_OTG_GINTMSK_OEPINT | USB_OTG_GINTMSK_IEPINT |
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USB_OTG_GINTMSK_CIDSCHGM | USB_OTG_GINTMSK_SRQIM | USB_OTG_GINTMSK_MMISM;
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// Set USB Turnaround time
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USBx->GUSBCFG |= ((USBD_FS_TRDT_VALUE << 10) & USB_OTG_GUSBCFG_TRDT);
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// Enables the controller's Global Int in the AHB Config reg
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USBx->GAHBCFG |= USB_OTG_GAHBCFG_GINT;
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// Soft disconnect disable:
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USBx_DEVICE->DCTL &= ~(USB_OTG_DCTL_SDIS);
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// enable the IRQ
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NVIC_EnableIRQ(OTG_HS_IRQn);
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}
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