- Add tud_audio_n_get_ep_out_ff(), tud_audio_n_get_ep_in_ff(),
tud_audio_n_get_rx_support_ff(), and tud_audio_n_get_tx_support_ff()
- Change get_linear_read/write_info() to return linear and wrapped part
at once
- Adjusted affected code in audio_device.c and tested with
audio_4_channel.
Implemented a special copy strategy to copy directly from the FIFO. This
function, however, is untested and should be regarded as unreliable
until somebody was able to test it
Some ST parts (like STM32F74xxx / STM32F75xxx) allow the USB_OTG_HS core to be used with
either an external high-speed ULPI PHY or an internal full-speed-only (12mbps) PHY. Currently
the code assumes than an ULPI PHY is used unless the chip has an internal high-speed PHY
(`#if defined(USB_HS_PHYC)`), with no provision to use the internal FS PHY.
Current implementation always sets odd/even bit for ISO transactions.
This is a good strategy only if interval is 1.
For ISO endpoint interval in (micro)frames is computed as
2^(interval-1), which means that odd/frame number should stay
same for interval values > 1.
With this change only when interval is 1 odd/even bit is modified.
dcd_edpt_close() no longer modifies FIFO distribution.
Code that that was commented out is removed along with
variables that are no longer used.
FIFO distribution among endpoints is handled upfront
and does not need to be modified in open and close endpoint
functions.
Recommended FIFO allocation schema includes 2 maximum endpoint sizes.
Comment suggested that this is the case while it would work according
to this description only in checked endpoints were ascending sizes.
Also two same size endpoints would be counted as one.
That is fixed by way sz is filled.
Calculation used too much modulo operation while single division was enough
to account for odd FIFO sizes.
Extra space that is evenly distributed between Bulk and control endpoints
was incorrectly calculated it could prevent allocation of ISO endpoint FIFO
when bulk endpoints existed with smaller endpoint numbers.
Minimum endpoint FIFO size is 16 32bit words, FIFO space requirement is
now observed.
