Posted on October 17, 2011 at 17:52I have been looking at the USB OTG Libraries for the 105/7 and I've come across the variable TotalFifoSize. It's set to 320, when using the Full speed core.
I was wondering if anyone knew if this was because of a hardware spec, that I can't seem to find, or if it is a choice made by the libraries, and if it is a choice, what are some of the reasons one might consider when making that choice.
The value is set to 320 in the file usb_core.c around line 234.
snippet of usb_core.c:
.....
/* initialize device cfg following its address */
if (coreID == USB_OTG_FS_CORE_ID)
{
baseAddress = USB_OTG_FS_BASE_ADDR;
pdev->cfg.coreID = USB_OTG_FS_CORE_ID;
pdev->cfg.host_channels = 8 ;
pdev->cfg.dev_endpoints = 4 ;
pdev->cfg.TotalFifoSize = 320; /* in 32-bits */
pdev->cfg.phy_itface = USB_OTG_EMBEDDED_PHY;
....
