It looks to me like it could be a cheaper alternative the the standard fdti chip everyone uses. Also being pin compatable wth the 18f44K50 (?) PIC it would be possible to have some nice options on boards that required different firmware.
I am currently looking at getting some usb-ttl boards made up that could be both a replacement for the fdti serial boards as well as a development platform for the 18f chip.
anyone have any comments on this chip or any other information as i havnt got to use one yet so i am guessing a bit.
I have been thinking for a while now that a addin board for the webserver would be a good idea. Also i have allways like the idea of the development kit from microchip. After a quick PM to ian he suggested to start up a thread so here we are.
My idea is to create a addon board with the same basic features from the internet radio board from microchip to allow it to stream audio and possibly even play mp3's etc from the sd card.
from what i can see, the following would need to be implemented.
1. 2 x SRAM chips. may as well start with the micro chip ones. http://ww1.microchip.com/downloads/en/DeviceDoc/22100D.pdf 2. VLSI VS1011E MPEG Audio Codec. again lets start with the same one they use and evaluate from there. 3. LCD display. my idea here is a simple character display as from what i have found and from what ian has mentioned a graphic display is harder to source. lets not rule it out though. 4. some buttons for input.
the first problem i saw was that theres not enough i/o to run all this directly to a addin board. from my calculations there is the 8 i/o on the expansion header and 4 pins for the SPI header.
since the 2 ram and the audio codec seem to be spi as well i figure we can use the 4 spi pins as well as 3 more pins for c/s. that leaves 5 i/o. now looking at the block diagram in the microchip site the audio chip it seems to require3 more pins. so until i have looked further i will assume that to be the case. leaving 2 more pin, pissibly another c/s pin, edit: a quick looks at the datasheet for the vs1011 it seems that it requires 7 i/o in total. 3 spi, cs as well as 3 others for data control. On the upside it does have 4 GP io coming out of the chip that we may be able to use for something.
My original idea was to use an i2c i/o expansion board for the lcd like the lcd board on the buspirate. but it seems that we are short on pins.
[s:]Im assuming that if i look i will be able to find a similar chip that uses spi. if it was a 16 i/o chip then we should have enough for lcd + some buttons.[/s:] edit: quick check of microchips website found a 16 bit spi i/o expansion chip. im sure there are other brands.
At this stage im going to look into this further but if anyone has any idea's and or comments please feel free to post.
since it looks like this forum is starting to get some answers. ill ask a question that i have been dieing to ask since i saw you were developing this.
Is this board either in its current form or possibble via new firmware.
I would love to see a replacement for microsofts MCE remote. I can buy the logitech harmony remotes to control the sending side of things but without the receiver theres not much point.
Now for the bad news. i have tried searching for some specifications for the MCE remote standard. but i havnt found anything. I do know that windows either has drivers built in or doesnt need drivers. so im guessing its a HID device.
Anyway food for thought.
Also one of the features that the genuine remote reveiver has is that it has 2 external IR led's for controlling external devices like settop boxes etc.
I think from what ian has said the current chip in the buspirate is getting pretty full.
is it worth looking at switching a v4 board to be one of the pic 33 series with alot more memory? I assume the pinouts are close enough to the current chip so those with the available equipment could swap the chip on the current boards.
Also maybe start to look at making modules in the code that can be included or not in the compile to suit the memory.
but hey im allready thinking of ways to stack it ontop of the current chip
As for a project suggestion from me. well i may as well look at moving my idea for the old webserver to this webserver. I have some DIY RGB light controllers that are DMX comatible. they are currently controlled via a PC and some software to do my xmas light display. My long term plan is to turn them into RGB garden lights with the ability to change the light pattern on them, so for me the ability to output a dmx data string would be great. with the idea of expanding it to show different patterns on the lights controllable via the webpage.
Im pretty sure I can handle the hardware interfacing to the devices.
I know its very "niche" but hey. its what i would be looking at after christmas.
overall Very nice Job, I will be ordering one or two very soon. Also if the PCB was available i would be be happy as well as i have most of the parts allready.
anyway its late here so imm off to think about the possibilities.
Well my free sunday board turned up a couple of days ago. thanks heaps.
i managed to sit down and go though my parts box and find alot of the parts needed. ( it helps to have ordered more than enough parts for your business card webserver)
I figure ill take your advice and upgrade the regulators from the smt packages you speced for the board. I also have a 20x4 lcd sitting here so once the rest is working ill add that. Strangly enough i couldnt find a 5v or 3.3v regulator in a ta220 package here at all. lots of smaller 100ma ones but nothing in a larger package. I assume the fet isnt to specific, i have some 2n7000 fets here i was gonna check to see if they would work.