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usbdux: usbduxsigma: added soft interval mode in the firmware 

urb->interval is ignored in xhci drivers. Instead, the firmware
has an interval counter and transmits data at this interval.
The uframes in-between are zero length packets. In order to be
backward compatible with older kernels which support only USB 2.0
and 1.1 there are two ADC modes in the firmware. The old one which
assumes that the interval is established by the host (urb->interval)
and the new one where the interval value is transmitted to the
firmware.

Signed-off-by: Bernd Porr <mail@berndporr.me.uk>
Signed-off-by: Kyle McMartin <kyle@kernel.org>
This commit is contained in:
Bernd Porr 2015-07-22 09:27:12 +01:00 committed by Kyle McMartin
parent 00810902b5
commit 22e3407bda
1 changed files with 27 additions and 0 deletions
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27
usbdux/usbduxsigma_firmware.asm
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@ -39,6 +39,8 @@
.equ DPTRL,85H
.equ DPTRH,86h
.equ ASYNC_ON,87h
.equ INTERVAL,88h ; uframe/frame interval
.equ INTCTR,89h ; interval counter
;;; actual code
.org 0000h ; after reset the processor starts here
@ -546,7 +548,18 @@ sof_isr:
push 07h ; R7
clr IE.7 ; make sure that no other int's disturbe us
mov r0,#INTCTR ; interval counter
mov a,@r0 ; get the value
dec a ; decrement
mov @r0,a ; save it again
jz sof_adc ; we do ADC functions
ljmp epfull ; we skip all adc functions
sof_adc:
mov r1,#INTERVAL ; get the interval
mov a,@r1 ; get it
mov @r0,a ; save it in the counter
mov a,EP2468STAT
anl a,#20H ; full?
jnz epfull ; EP6-buffer is full
@ -762,6 +775,7 @@ ep1out_jmp:
sjmp nothing ; a=6
sjmp pwm_on ; a=7
sjmp pwm_off ; a=8
sjmp startadcint ; a=9
nothing:
ljmp over_da
@ -790,12 +804,25 @@ initsgADchannel:
sjmp over_da
startadcint:
mov dptr,#0e781h ; FIFO buffer of EP1OUT from 2nd byte
movx a,@dptr ; interval is the 1st byte
inc dptr ; data pointer
sjmp startadc2 ; the other paramters as with startadc
;;; config AD:
;;; we write to the registers of the A/D converter
startadc:
mov dptr,#0e781h ; FIFO buffer of EP1OUT from 2nd byte
mov a,#1 ; interval is 1 here all the time
startadc2:
mov r0,#INTERVAL ; set it
mov @r0,a
mov r0,#INTCTR ; the counter is also just one
mov @r0,a
movx a,@dptr ; get length of channel list
inc dptr
mov r0,#MAXSMPL