Interface with SX1509

[Algadz]

Hi everyone,

I need some additionnal output so I'm trying to use the Sparkfun SX1509 i2c extension board.

My setup (M115 call) : 1.21RC1 ELECTRONICS: Duet Ethernet 1.02 or later + SX1509B expander FIRMWARE_DATE: 2018-01-25

I have soldered the sx1509 to be at i2c address 0x71 (I've checked with my Raspberry Pi that the address is correct).

My problem is the following:

I tryed to use the M42 S255 P1 command to set sx1509 pin 15 to HIGH,
and the board answer is : "Logical pin 255 is not available for writing" (same problem for pin 220 to 235)

Is there any thing to do to set this pin to output mode ?

I've tryed using :
M260 A0X0E B0X00
M260 A0X0F B0X00
to set RegDir register of the sx1509 to set pin 0 to 15 to output mode but the problem remain

I've also tried to send :
M260 A0X10 B0XFF
M260 A0X11 B0XFF
to set RegData register and set pin 0 to 15 to HIGH but no result either.

Thank you
Alban

[Algadz]

Also for the wiring of the sx1509, I plugged it to the following pin of the expansion header of the Duet Ethernet

SX1509 DUET
SCL –--> TWCK0
SDA ----> TWD0

[dc42]

The logical pin numbers you need to use in the M42 command are 120 to 135.

[Algadz]

Thanks it works !

You might have to correct the port value in the wiki here (?) :
https://duet3d.com/wiki/Adding_additional_output_ports

Alban

[dc42]

Done.