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80 lines
2.9 KiB
80 lines
2.9 KiB
#include "llusb_declarations.h"
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USB_OTG_GlobalTypeDef *USBx = USB_OTG_FS;
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static void OTG_FS_IRQ_Handler(void) {
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NVIC_DisableIRQ(OTG_FS_IRQn);
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//__disable_irq();
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usb_irqhandler();
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//__enable_irq();
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NVIC_EnableIRQ(OTG_FS_IRQn);
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}
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void usb_init(void) {
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REGISTER_INTERRUPT(OTG_FS_IRQn, OTG_FS_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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// full speed PHY, do reset and remove power down
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/*puth(USBx->GRSTCTL);
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print(" resetting PHY\n");*/
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while ((USBx->GRSTCTL & USB_OTG_GRSTCTL_AHBIDL) == 0U);
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//print("AHB idle\n");
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// reset PHY here
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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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//print("reset done\n");
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// internal PHY, force device mode
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USBx->GUSBCFG = USB_OTG_GUSBCFG_PHYSEL | USB_OTG_GUSBCFG_FDMOD;
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// slowest timings
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USBx->GUSBCFG |= ((USBD_FS_TRDT_VALUE << 10) & USB_OTG_GUSBCFG_TRDT);
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// power up the PHY
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USBx->GCCFG = USB_OTG_GCCFG_PWRDWN;
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//USBx->GCCFG |= USB_OTG_GCCFG_VBDEN | USB_OTG_GCCFG_SDEN |USB_OTG_GCCFG_PDEN | USB_OTG_GCCFG_DCDEN;
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/* B-peripheral session valid override enable*/
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USBx->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
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USBx->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
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// be a device, slowest timings
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//USBx->GUSBCFG = USB_OTG_GUSBCFG_FDMOD | USB_OTG_GUSBCFG_PHYSEL | USB_OTG_GUSBCFG_TRDT | USB_OTG_GUSBCFG_TOCAL;
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//USBx->GUSBCFG |= (uint32_t)((USBD_FS_TRDT_VALUE << 10) & USB_OTG_GUSBCFG_TRDT);
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//USBx->GUSBCFG = USB_OTG_GUSBCFG_PHYSEL | USB_OTG_GUSBCFG_TRDT | USB_OTG_GUSBCFG_TOCAL;
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// **** for debugging, doesn't seem to work ****
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//USBx->GUSBCFG |= USB_OTG_GUSBCFG_CTXPKT;
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// reset PHY clock
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USBx_PCGCCTL = 0;
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// enable the fancy OTG things
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// DCFG_FRAME_INTERVAL_80 is 0
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//USBx->GUSBCFG |= USB_OTG_GUSBCFG_HNPCAP | USB_OTG_GUSBCFG_SRPCAP;
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USBx_DEVICE->DCFG |= USB_OTG_SPEED_FULL | USB_OTG_DCFG_NZLSOHSK;
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//USBx_DEVICE->DCFG = USB_OTG_DCFG_NZLSOHSK | USB_OTG_DCFG_DSPD;
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//USBx_DEVICE->DCFG = USB_OTG_DCFG_DSPD;
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// clear pending interrupts
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USBx->GINTSTS = 0xBFFFFFFFU;
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// setup USB interrupts
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// all interrupts except TXFIFO EMPTY
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//USBx->GINTMSK = 0xFFFFFFFF & ~(USB_OTG_GINTMSK_NPTXFEM | USB_OTG_GINTMSK_PTXFEM | USB_OTG_GINTSTS_SOF | USB_OTG_GINTSTS_EOPF);
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//USBx->GINTMSK = 0xFFFFFFFF & ~(USB_OTG_GINTMSK_NPTXFEM | USB_OTG_GINTMSK_PTXFEM);
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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 | USB_OTG_GINTMSK_USBSUSPM |
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USB_OTG_GINTMSK_CIDSCHGM | USB_OTG_GINTMSK_SRQIM | USB_OTG_GINTMSK_MMISM | USB_OTG_GINTMSK_EOPFM;
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USBx->GAHBCFG = USB_OTG_GAHBCFG_GINT;
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// DCTL startup value is 2 on new chip, 0 on old chip
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USBx_DEVICE->DCTL = 0;
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// enable the IRQ
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NVIC_EnableIRQ(OTG_FS_IRQn);
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}
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