[GreatFET] I2C FRAM read/write issue

Jacob Graves jacob at greatscottgadgets.com
Mon Feb 1 14:11:43 EST 2021

This looks like there's something wrong with your write tool, not the 
hardware. Have you installed latest host/firmware code from master? You 
should be able to read/write to an incorrect address without error, it 
just won't do anything useful.

On 1/27/21 1:00 PM, Michael Messuri wrote:
> I'm having an issue trying to read/write an I2C FRAM (Adafruit I2C 
> FRAM Breakout) and was hoping someone with more experience could help 
> me solve it the problem:
>     When I issue the cmd: "gf i2c -z -v" the results come back that 
> address 0x50 is both read/writable (there is a WR in column 0) and 
> address 0x70 (with a W in column C) is writable.  However, when I then 
> issue the cmd: "gf i2c -a 0x50 -w 0x01 -v" I get a traceback in file 
> greatfet_i2c.py line 73 with a TypeError: 'tuple' object cannot be 
> interpreted as an integer.  Now if I try the same type of thing inside 
> the shell I see that I am not receiving any status results from the 
> i2c read or i2c write results.
>     at this point I am a little unclear why the scan result would come 
> back as r/w at address 0x50 (which is default for the i2c fram) and 
> then any r/w command would fail.
> Thanks.
> -- Michael --
> mmessuri at 4rsons.com
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