Re: [Gumstix-users] I2C modules don't build?

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

Hi Nicholas,

On 4/30/06, Nicholas S-A <no...@ma...> wrote:
> >
> > The 0xbf will have selected an external crystal, so if you don't have
> > one connected up, that's why it's dead.
> >
>
> I attached an 8Mhz crystal and successfully programmed the bootloader.
> I am trying to load i2c-io on to it. I have the i2c bus connected, but
> the ATmega is not recognized:

> I2C Dev Addr: 0x0b
>       Version: 1
>    MinVersion: 1
>   Part Number: 0x9702 (ATMega128)
>      Reg Size:  256
>      RAM Size: 4096
>   EEPROM Size: 4096
>     Page Size:  256
>    Flash Size:  128k
> Node Name: not set
> Boot Delay: unset, defaults to 5 seconds
> I2C Addr: unset, defaults to 0x0b

So what I did was used the SetI2cAddr command to change the i2c
address of the robostix to something else (0x0c).

> I tried to change the BL_DEFAULT_I2C_ADDR (or something) to 0x0d, which
> caused some wierd error on line 48 of memcpy_ES:
> Assembling ../Common/memcpy_EP.S ...

The fact that it's even trying to assemble memcpy_EP.S means that you
forgot to specify the CPU_MCU=3D8 on the make command line. It defaults
to being an ATMega128 at 16 MHz.

So the best thing to do is this:

make CPU_MCU=3D8 CPU_FREQ=3D8 clean
make CPU_MCU=3D8 CPU_FREQ=3D8

Forgetting the CPU_MCU once will give you mixed executables. What I
really need to do is make the object files avr specific, but when I
started it was just targeting the ATMega8 so I didn't bother.

> ../Common/memcpy_EP.S: Assembler messages:
> ../Common/memcpy_EP.S:48: Error: constant value required
> ../Common/memcpy_EP.S:48: Error: number must be less than 64
> ../Common/memcpy_EP.S:54: Error: illegal opcode elpm for mcu atmega8
> which, if I remember correctly, did not happen before.
>
> so I just commented the dependency out because I had the binary still.
> (A temporary fix)

Your makefile should already look like this:

ifeq ($(CPU_MCU),128)
COMMON_OBJS +=3D memcpy_EP.o
endif

which means it only includes the memcpy_EP.o when targeting the ATMega128

I put my .hex files on my website:
http://www.davehylands.com/gumstix-wiki/ATMega8/i2c-Boot-m8-8MHz.hex
http://www.davehylands.com/gumstix-wiki/ATMega8/i2c-io-m8.hex

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/