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philippe44
2021-12-05 18:25:12 -08:00
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@@ -258,11 +258,13 @@ Each expander can support up to 32 GPIO. To use an expander for buttons, an inte
The parameter "gpio_exp_config" is a semicolon (;) separated list with following syntax for each expander The parameter "gpio_exp_config" is a semicolon (;) separated list with following syntax for each expander
``` ```
model=<model>,addr=<addr>,[,port=system|dac][,base=<n>|100][,count=<n>|16][,intr=<gpio>] model=<model>,addr=<addr>,[,port=system|dac][,base=<n>|100][,count=<n>|16][,intr=<gpio>][,cs=<gpio>][,speed=<Hz>]
``` ```
- model: pca9535, pca85xx (untested) and mcp23017 - model: pca9535, pca85xx (untested), mcp23017 and mcp23s17 (SPI version, untested)
- addr: inthe i2c address decimal - addr: chip i2c/spi address (decimal)
- port: use either "system" port (shared with display for example) or "dac" port (system is default) - port (I2C): use either "system" port (shared with display for example) or "dac" port (system is default)
- cs (SPI): gpio used for Chip Select
- speed (SPI): speed of the SPI bus for that device (in Hz)
- base: GPIO numbering offset to use everywhere else (default 40) - base: GPIO numbering offset to use everywhere else (default 40)
- count: number of GPIO of expander (default 16 - might be obsolted if model if sufficient to decide) - count: number of GPIO of expander (default 16 - might be obsolted if model if sufficient to decide)
- intr: real GPIO to use as interrupt. - intr: real GPIO to use as interrupt.