MAX3421 as a host withy PICAXE

I need to read USB keyboard codes.
I have MAX3421 ev-kit and I'd like to write a code that will allow to detect and configure keyboard and then read codes for pressed keys.
So far I can read registers and write data to registers using half-duplex bit banging SPI.
Does anyone have experience with the MAX3421 working as a host?

On the 3421 ev-kit card I can see the bus-power-switch.
It is controlled by GPOUT7.
Start with setting the GPOUT7 = 1.
That should switch the power to the USB connector and set the FLAG on GPIN0 low.

:wink:
IanP

I write extensively about max3421e programming here -> Circuits@Home . Look for USB Host Shield. There is a lot of sample code, too.

felis_CO said:

I write extensively about max3421e programming here -> Circuits@Home . Look for USB Host Shield. There is a lot of sample code, too.

Click to expand...

Unfortumatelly all that stuff is in C and I am not "C-MAN"

---------- Post added at 07:35 ---------- Previous post was at 07:34 ----------

IanP said:

On the 3421 ev-kit card I can see the bus-power-switch.
It is controlled by GPOUT7.
Start with setting the GPOUT7 = 1.
That should switch the power to the USB connector and set the FLAG on GPIN0 low.

:wink:
IanP

Click to expand...

Yes, I can do that.
What would be next?

DrWhoF said:

What would be next?

Click to expand...

Try to set the MAX3421 as a low-speed host ..

:wink:
IanP

Try to set the MAX3421 as a low-speed host

Click to expand...

Which registers have to be set-up?

DrWhoF said:

Which registers have to be set-up?

Click to expand...

Set the following bits in the R27 register:

DPPULLDN - R27, b7
DMPULLDN - R27, b6
LOWSPEED - R27, b1
HOST - R27, b0

In other words, try to send 0xC3 to R27

Then issue a USB bus reset by setting BUSRST - R29, b0 --> wait something like 100ms and turn on frame markers by sending 0xCB to R27 ..
Now, clear bit FRAMEIRQ and at this stage MAX3421 should generate one SOF packet.

:wink:
IanP

Ok, the issue with the MAX3421 is solved, and I can set/read/reset all registers.
So I set it up into the low-speed-host mode, then I set the device address using SUDFIFO. **Next I sent to PERADDR 0x01 – device=keyboard, and so on ..

In an endless loop I send an IN token to EP1, read bits HRSLT0-4, if=0x00 success, and so on, ...., and so on ..
I could read USB keyboard’s press and release codes ..
Fine.

I tried another keyboard.
The same as above.

I tried another keyboard = nothing works.
Keyboard is OK when plugged to a PC.
When I try to send address to it (step **) it returns 0x0D, that is J-state, should be 0x00 => ACK.
So, I’m stuck here and at this moment have no clue what to do next.

Q: keyboards suppose to be low-speed devices. Is it possible that not all are?

It doesn’t look like you have performed full enumeration and the USB Enumeration is the process of detecting, identifying and loading drivers for a USB device ..
Some keyboards may respond without full enumeration, some may not .. it's difficult to predict a device's behaviour when you try to make a short-cut ..
Have you tried more keyboards and is that one that didn’t work somehow different from the others?

:wink:
IanP