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Tasmota supports indiviual chip mirrored INT GPIO's with interrupt on change only. IOCON is configured like I suggest you try without interrupts first and rely on the polling of Tasmota and see how that works. |
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While looking over the MCP23x config possibilities I see an opportunity to make Open Drain interrupts user configurable. I'll work on that now. |
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In latest dev (v14.4.0.1) the following addition has been made: Template option IOCON - Optional. IOCON I/O Expander configuration register (bitmap: 0 MIRROR 0 DISSLW HAEN ODR INTPOL 0. Default 0b01011000 = 0x58) Example: Notice the addition of value pair IOCON 0x5C. On restart the value becomes active: |
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Thank you for your quick support. |
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Meanwhile I was able to build the board and did some testing. I also set the common interrupt to line to “MCP23xxx INT” (1) since all MCP interrupt ports share a common interrupt port on the ESP. |
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Did you configure the interrupt GPIO in Tasmota?
Once I configure that I see this in log mode 4: Notice the first message. EDIT1: I use a 2k2 pull-up on the combined interrupt line. EDIT2: If you do not need multipress these commands speed up response considerably: |
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Today I downloaded the developement branch again. then I changed the user_config_override.h file. I use a lot of drivers since I use one binary for all of my projects. Checked the pull-up (4k7 in my case). Checked the version of Tasmota Firmware build. Checked Log Level4. Still don't see an interrupt. I also checked the logic level of GPIO33. (MCP23xxx Int) From my perspective this is wrong. Without power I meassure 5k1 Ohm from GPIO33 to GND. I assume one open drain pin is permant active (low). This is my mcp23x.dat file. Is this correct regardring "IOCON":0x5C? In my case 3 MCP23017 interrupt ports are connected to MCP23xxx int. |
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Do you think it's worth to rebuild this on a bread board? Right now, I use SMD parts and I cannot check which input port is going low. I assume either a defective chip or the register programming might be wrong. |
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Hello,
I'm going to use multiple MCP23017 as input in a project. Every MCP23017 provides two interrupt ports INTA and INTB. I'm aware that these ports can be connected to an ESP port.
MCP23017 INT-ports can be programmed for interrupts on low active, high active and open drain.
I don't what the driver does.
My idea is to connect all INT-ports of all MSP to one ESP Port.
With open drain configuration of the MSP INT-ports this will work and I could also power the MCP with 5V while the interrupt can be used with 3,3V (pullup to 3,3V).
My question is:
Is the driver in Tasmota using the interrupts pins of MSP23017 in open drain mode?
In my opinion the would always require a pull-up resistor or is the ESP input configured with a weak pull-up in the ESP.
Can I use multiple MSP23017 interrupts by connection them all together?
Do I have to use an external pull-up or is the ESP configured with an internal pullup?
Thank you für your answers.
Karsten
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