I replaced my i2c files with those from the trunk r2209 and all of i2c.c! i2c.c@ i2c.n! i2c.n@ i2c.m!n@ give me what I was expecting.
What I was doing incorrectly below I don't know but perhaps starting from a completely fresh UNO (as I did above) was part of the solution. Apologies, I will do that first next time. Tristan On 25Jan17 00:37, Tristan Williams wrote: > Hello, > > I am in the process of connecting a keypad to an i2c port expander > (PCF8574A) to an UNO and have run into the following problem. More > than likely the problem is my lack of understanding. Writing to the > port expander appears to be no problem. Reading from it using i2c.>n > results in the UNO hanging. Writing zero bytes and then reading 1 byte > using i2c.m>n appears to read the port expander correctly (i.e. 1 0 > $38 i2c.m>n). What am I missing? Edited minicom session below. > > Best wishes and thanks, > Tristan > > amforth 6.3 ATmega328P Forthduino > > i2c.init.default > ok > > i2c.detect > 0 1 2 3 4 5 6 7 8 9 A B C D E F > 0: -- -- -- -- -- -- -- -- -- > 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- > 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- > 30: -- -- -- -- -- -- -- -- 38 -- -- -- -- -- -- -- > 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- > 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- > 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- > 70: -- -- -- -- -- -- -- -- > ok > > # turns on each LED attached to the port expander (ports sinking) > > $00 1 $38 i2c.n> > ok > > # turns off each LED attached to the port expander > > $ff 1 $38 i2c.n> > ok > > # this hangs the UNO > > 1 $38 i2c.>n > > # (repeating all comands except the one above) > # this reads the port expander address and leaves $ff on the stack > > 1 0 $38 i2c.m>n > ok > > > > > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Amforth-devel mailing list for http://amforth.sf.net/ > Amforth-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/amforth-devel > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
