Hi Hans,
If I understand correctly, I need to set bufsize in struct usb_config as
follows:
[UMASS_T_BBB_DATA_READ] = {
.type = UE_BULK,
.endpoint = UE_ADDR_ANY,
.direction = UE_DIR_IN,
.frames = 128,
.bufsize = UMASS_BULK_SIZE * 128,
.flags = {.proxy_buffer = 1,.short_xfer_ok = 1,
UMASS_USB_FLAGS},
.callback = &umass_t_bbb_data_read_callback,
.timeout = 0, /* overwritten later */
},
Thanks
Aman
On 02/20/2013 02:36 AM, Hans Petter Selasky wrote:
On Tuesday 19 February 2013 23:26:19 Aman Sawrup wrote:
I believe the amount of memory reserved needs to be much higher. For
example, if sizeof(struct usb_page) is 16 bytes, then for n_frbuffers of
128 and parm->bufsize of 131072, we need the following amount of memory
reserved:
parm->bufsize / USB_PAGE_SIZE * n_frbuffers * sizeof(struct usb_page)
= 131072 / 4096 * 128 * 16
= 65536
Hi,
The parm->bufsize is shared for all frbuffers, so the formula should be
correct. In your computation you assume that parm->bufsize gives the maximum
for each frbuffer. That is not the case.
That means, when you configure bufsize, you must not exceed that size as a
total when setting up frames. This include all transfer types. I think there
are asserts for that so you should get a panic fairly quickly.
--HPS
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