Additional outputs using a SX1509B Expander
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I may be wrong, but I think pull-up resistors can only be enabled on ports of the Duet board itself.
There are source-files specifically for this expansion chip (here), however I have no idea what the "DuetNG" denomination is about to be honest. Also, this branch seems to be of the 2.x firmware only? -
@t0bias, which firmware version are you using? In particular, part of that code was rewritten between versions 3.2.2 and 3.3beta1, so what works in one might not work in the other.
I can increase the number of available GpOut ports in the next 3.3beta. Would 20 be sufficient?
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@dc42 thanks for your reply. I am using version 3.1.1, would a upgrade fix the issue?
yes, 20 would be sufficient, maybe a bit more would be even better still?
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@t0bias said in Additional outputs using a SX1509B Expander:
@dc42 thanks for your reply. I am using version 3.1.1, would a upgrade fix the issue?
An upgrade to 3.3beta1 might possibly fix it, if it doesn't then let me know and I'll implement a fix in 3.3beta2.
yes, 20 would be sufficient, maybe a bit more would be even better still?
Memory is rather tight on the Duet 2, so I'll set it to 20 in 3.3beta2. It's already 32 on Duet 3 and 3 Mini.
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I upgraded to 3.3beta1 today, but it still doesn't work unfortunately
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Thanks, this is on my list to test/investigate.
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I have just tested this, and ports sx1509b.0, .1 and .2 all work for me using RRF 3.2.2 and also using RRF 3.3beta1. I didn't test the other ports.
Points to note:
- M115 will report the SX1509B if it is detected:
04/03/2021, 11:17:06 m115 FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.3beta1 ELECTRONICS: Duet WiFi 1.02 or later + DueX5 + SX1509B expander FIRMWARE_DATE: 2021-02-14 16:00:49- My test system includes a very old DueX5. On these old boards, the TWC and TWD pins are labelled the wrong way round on the 10-pin expansion header. They are also labelled incorrectly on the wiring diagrams at https://duet3d.dozuki.com/Wiki/Duex_wiring_diagrams for the 0.6 and 0.7 boards. On all DueX revisions, TWC (aka SCL) is next to the ground pin at the end of the header.
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Strange, the SX1509B is in fact detected:
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.3beta1 ELECTRONICS: Duet WiFi 1.02 or later + SX1509B expander FIRMWARE_DATE: 2021-02-14 16:00:49however the pins don't get driven high (or low) using the M42 commands.
I am confident the I²C-Wiring is correct, since I tried using a MCP23017 based relay board that responds to I²C-Commands just fine.Any suggestions or ideas are highly appreciated!
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@t0bias
Have you checked the I2C address?
It has to be set to 0x71Here some code to test it directly with M260
https://forum.duet3d.com/topic/13911/sx1509-on-maestro-does-it-work/3 -
@t0bias, if the board is detected then the I2C pins are connected correctly and the slave address is set correctly.
How are you testing the outputs of the SX1509B? I have connected each output through a 100 ohm resistor to one of the cathodes of a 2-digit common anode 7-segment display, with the anodes connected to +3.3V.
