From: Brendan Simon <Brendan@BrendanSimon.com> - 2006-01-13 05:24:23
>> I've had a look at the schematic for the Robostix and I finding it not
>> so easy to understand. Is there a block diagram available that is a
>> little clearer from an overall design perspective? If so could this be
>> added to the robostix schematic page. I basically want to know which
>> signals route to each of the major modules and sub-modules.
> Sounds like a great suggestion. I'll take a stab at doing that this evening=
> Page 3 of the ATMega 128 datasheet has a nice block diagram of the AVR itse=
No use reinventing the wheel. I'm more interested in the robostix
components and how the interconnect with each other and the gumstix.
>> From what I can derive from the schematic there seems to be only the
>> SPI and a few IO lines connected from the gumstix to the Atmega. Is
>> that correct? Are there any other lines or peripherals interconnecting
>> the two devices?
> The SPI and I2C busses are connected together. The STUART from the
> gumstix is right next to UART0 from the AVR and they can be jumpered
> together (this is required to do the ISP programming).
> I have i2c working pretty good between the two and I'm just wrapping
> up my bootloader. It can read and write Flash/EEPROM and SRAM on the
> Port E, pin 2 on the robostix (ATM_IRQ) connects through to LDD_11.
> The intent here was to have some way for the robostix to interrupt the
So there does not seem to be any way to wirte data in a parallel fasion,
right? Not 8 bits, or even 4 bits at a time. It has to be done
serially through either SPI or I2C. That's fine, I can cope with that.
Which is the fastest interface, SPI or I2C. I presume both can generate
interrupts when data or packets are sent or received.
Cheers and thanks,
From: Brendan Simon <Brendan@BrendanSimon.com> - 2006-01-14 01:35:31
> Message: 2
> Date: Thu, 12 Jan 2006 23:54:18 -0800
> From: Dave Hylands <dhylands@...>
> To: gumstix-users@...
> Subject: Re: [Gumstix-users] Robostix/gumstix connections
> Reply-To: gumstix-users@...
> I put the block diagram on the robostix schematic page.
I would probably add a label called "robostix connectors" at the bottom.
Also, is there a control signal to the level converter from the gumstix?
BTW, the URL above didn't work. I used this URL.