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Updated MCP23008 MCP23017 (markdown)

andrethomas 2018-08-07 20:32:01 +02:00
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MCP23008-MCP23017.md

@ -178,4 +178,34 @@ In the example above the rule would respond to an interrupt of HIGH on pin 0 of
See the Wiki on [Using Rules](https://github.com/arendst/Sonoff-Tasmota/wiki/Rules) for more information on how this can be helpful to your requirements. See the Wiki on [Using Rules](https://github.com/arendst/Sonoff-Tasmota/wiki/Rules) for more information on how this can be helpful to your requirements.
_Finally, keep in mind that the MCP23008/MCP23017 chip will only store the last interrupt registered in the interrupt register and capture register - Because the interrupt register is only checked every 50 milliseconds by the Tasmota firmware you may experience missed interrupts if your incoming signals fluctuate/change faster than 20 times per second._ _Finally, keep in mind that the MCP23008/MCP23017 chip will only store the last interrupt registered in the interrupt register and capture register - Because the interrupt register is only checked every 50 milliseconds by the Tasmota firmware you may experience missed interrupts if your incoming signals fluctuate/change faster than 20 times per second._
***
### EXPERIMENTAL OUTPUT FUNCTIONS
An output version of xsns_29_mcp230xx.ino can be found here https://github.com/andrethomas/Sonoff-Tasmota/blob/mcp230xx_output/sonoff/xsns_29_mcp230xx.ino
Replacing the original file with the one above will allow you to enable experimental OUTPUT support by adding the following compiler directive to your user_config.h
`#define USE_MCP230xx_OUTPUT`
This will extend the sensor29 command enabling pinmode 5 for output, for example:
```
sensor29 0,5,0 // Configure pin 0 as OUTPUT and default to LOW(0) on reset/power-up
sensor29 0,5,1 // Configure pin 0 as OUTPUT and default to HIGH(1) on reset/power-up
```
If SAVE_STATE / setoption0 is enabled in your firmware configuration then the last known state of the pin will be used on power-up/reset thereby ignoring the pull-up parameter in the commands above.
To change the state of an output pin you may use:
```
sensor29 0,ON // Turn pin 0 ON/HIGH/1
sensor29 0,OFF // Turn pin 0 OFF/LOW/0
sensor29 0,T // Toggle the current state of pin 0 from HIGH to LOW or LOW to HIGH
```
Please note that this functionality is EXPERIMENTAL and support is not guaranteed.
As at the time of writing this, the above functionality is not yet staged for implementation in the Tasmota development branch.