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fix some typos

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ahtn 2017-09-20 19:05:00 +10:00
parent f21a9c566c
commit c86b57a966
1 changed files with 15 additions and 9 deletions
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24
keyplus_mini/README.md
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@ -10,10 +10,11 @@ should be SS.
### Wiring key matrix
The key matrix should be wired to the ROW and COL pins on the PCB. Wiring of the
ROW and COL and column pins should start from the lowest number pin (i.e. `ROW0`
ROW and COL pins should start from the lowest number pin (i.e. `ROW0`
and `COL0`) and work up in consecutive order. The diodes in the key matrix should
point from the COL to ROW pins (other scan modes not implemented yet).
The `COL15, COL14, COL13, COL12` pins (underlined on the PCB) may also be used
as `ROW` pins. They map to the following row pins:
@ -27,16 +28,17 @@ Thus it is possible to have up to 120 keys connected using a 10x12 matrix.
### Wired split with I2C
To connect to boards with I2C for wired split, connect the 5V, SDA, SCL, and
GND pins between devices. You can connect several devices in this manner, they
GND pins between devices. You can connect several devices in this manner. They
just need to share 5V, SDA, SCL and GND pins.
I would recommend **NOT** using TRRS connectors for wired split. While connecting and
disconnecting the device the contacts inside the TRRS cable can short to one
another. Instead I would recommend using micro USB ports, or another
connector that doesn't short it's contacts when it is plugged/unplugged. Then
you will be able to take advantage of the wireless/wired hot plugging
functionality without worrying about damaging the hardware. You can find
male-to-male micro USB cables online with a bit of searching.
I would recommend **NOT** using TRRS connectors for wired split. While
connecting and disconnecting the cabel, the contacts inside the TRRS cable can
short to one another. Instead, I would recommend using micro USB ports, or
another connector that doesn't short it's contacts when it is
plugged/unplugged. Then you will be able to take advantage of the
wireless/wired hot plugging functionality without worrying about damaging the
hardware. You can find male-to-male micro USB cables online with a bit of
searching.
### Wireless with nRF24L01+
@ -59,6 +61,8 @@ To connect an nRF24L01+ module you will need to connect these pins:
* MI -> MI / MISO
* SS -> SS / CSN (Note: rev2 PCB use MO instead)
* SCK -> SCK
* GND -> GND
* 3V -> 3.3V
![surface mount nRF24L01+ module pin out](https://raw.githubusercontent.com/ahtn/keyplus/master/notes/mini-nrf24l01-smd.jpg)
@ -120,6 +124,7 @@ Where each line shows which keys in the matrix are currently being pressed.
Note only devices directly connected by USB will report key presses using
passthrough mode.
## xusb bootloader
The bootloader installed on the ATxmega is the [xusb bootloader](https://github.com/ahtn/xusb-boot).
@ -134,6 +139,7 @@ external programmer. This is done to protect the encryption keys that are
stored in flash. Also, for security reasons the bootloader will wipe SRAM on
power up.
## Trouble shooting
* Make sure that the battery contacts have a firm connection. I've had issues