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Added comment on frequency

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Nicolas Munnich 2024-09-02 17:42:53 +02:00
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docs/docs/development/hardware-integration/shift-registers.md
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@ -129,7 +129,7 @@ To add your shift register as a SPI device, you'll need to overwrite your board'
}; };
``` ```
If there is more than one device on the SPI bus, you will need to add additional pins to the `cs-gpios` phandle array - one for each device. The `@0` number marks the index of the `cs-gpios` pin used to control a device. If you have daisy chained multiple shift registers, you'll also want to increase the number of GPIOs that the shift register provides by editing the `ngpios` node - set this to your number of output pins (should be one of 8, 16, 24, 32). If there is more than one device on the SPI bus, you will need to add additional pins to the `cs-gpios` phandle array - one for each device. The `@0` number marks the index of the `cs-gpios` pin used to control a device. If you have daisy chained multiple shift registers, you'll also want to increase the number of GPIOs that the shift register provides by editing the `ngpios` node - set this to your number of output pins (should be one of 8, 16, 24, 32). You may also need to increase `spi-max-frequency` to a higher value if you have daisy chained shift registers, otherwise quick keypresses may on occasion not trigger.
### Using Shift Register Pins In Kscan ### Using Shift Register Pins In Kscan