USB Device Issue on Cyclone V / HPS

@FabricNS

Please ignore above issue that wasn't it.

I played some more with the tinyusb code and finally found the problem.  It seems the old dwc2 USB controller receive fifo size must be set to a minimum of 119 words.  The fix is to edit the tinyusb/src/portable/synopsys/dwc2/dcd_dwc2.c file at the function calc_device_grxfsiz().

The original code is:

TU_ATTR_ALWAYS_INLINE static inline uint16_t calc_device_grxfsiz(uint16_t largest_ep_size, uint8_t ep_count) {
  return (uint16_t)(13 + 1 + 2 * ((largest_ep_size / 4) + 1) + 2 * ep_count);
}

I changed it to this:

TU_ATTR_ALWAYS_INLINE static inline uint16_t calc_device_grxfsiz(uint16_t largest_ep_size, uint8_t ep_count) {
  // Altera Cyclone V SoC DWC2 bug, the minimum grzfsiz is 119 words, i.e. 4*119 = 476 bytes
#if defined(TUP_USBIP_DWC2_CV) && TU_CHECK_MCU(OPT_MCU_CV)
  uint16_t words = (uint16_t)(13 + 1 + 2 * ((largest_ep_size / 4) + 1) + 2 * ep_count);
  if(words < 119) words = 119;
  return words;
#else
  return (uint16_t)(13 + 1 + 2 * ((largest_ep_size / 4) + 1) + 2 * ep_count);
#endif
}

You will also need to add OPT_MCU_CV into tinyusb/src/common/tusb_mcu.h:

......
//--------------------------------------------------------------------+
// Geehy
//--------------------------------------------------------------------+
#elif TU_CHECK_MCU(OPT_MCU_APM32F0XX)
  #define TUP_USBIP_FSDEV
  #define TUP_USBIP_FSDEV_APM32
  #define CFG_TUSB_FSDEV_PMA_SIZE 1024u

//--------------------------------------------------------------------+
// Altera Cyclone V SoC
//--------------------------------------------------------------------+
#elif TU_CHECK_MCU(OPT_MCU_CV)
  #define TUP_USBIP_DWC2
  #define TUP_USBIP_DWC2_CV

  #define TUP_DCD_ENDPOINT_MAX 16
#endif

and also ensure to set it in your tusb_config.h:

#ifndef CFG_TUSB_MCU
#define CFG_TUSB_MCU          OPT_MCU_CV
#endif