update readme

README.md

@@ -1,10 +1,32 @@
 # SD_Swap
 
-## A development tool which swaps an SD card between a USB3 card reader or a SBC.
+## A development tool which swaps an SD card between a USB3 card reader and a SBC.
+
+### About
+
+SD_Swap allows reflashing of an SD card connected to the DUT (Device Under Test), without physical contact with the device. The board is designed in such way that it fits into micro SD card slots. Thanks to this, there is no need for special cables with a micro SD adapter, though it may be beneficial to add an extention to avoid accidentally breaking your boards SD connector if someone yanks the cable.
+
+This project was inspired by the [SDWire](https://wiki.tizen.org/SDWire) project.
+The major improvements are:
+- USB-C
+- USB3.0 read/write speeds
+- Simplified design/control
+- Solder jumpers to disconnect LEDs
+- Dim LEDs so you wont get blinded
+
+I have got SD write speeds up to 65MiB/s so 520Mbit/s
+
+### Rational
+
+After seeing the [SDWire](https://wiki.tizen.org/SDWire) project I was disappointed by the complexity as well as the lack of USB3. So this project is uses the REALTEK RTS5306E controller which many USB3 to SD adapters use. The chip has power suspend functionality which we can use as a GPIO for switching hosts. The suspend option will shut off the SD cards power but not the controllers; it also has build-in RW protection as to finish writes before switching to the SBC
+
+The SDWire project uses a USB to GPIO chip for this, but they have two power controlled USB ports on the board as well as the above mentioned method.
 
 ### Software
 To swap the SD card between the host PC and the SBC you run
-`./swap.sh 0` or `./swap.sh 1`. 1 is the host PC while 0 is the SBC. You can also chose which device to use if you have multiple attached. To do this run `./swap.sh 1` to print the found devices and type `./swap.sh 1-4 1` or another usb number. I have future plans to write this script for Windows and OSX.
+`./swap.sh 0` or `./swap.sh 1`.
+
+ `1` is the host PC while `0` is the SBC. You can also chose which device to use if you have multiple attached. To do this run `./swap.sh 1` to print the found devices and type `./swap.sh 1-4 1` or another USB number. I have future plans to write this script for Windows and OSX.
 
 ```
 $ ./swap.sh -h
@@ -48,15 +70,25 @@ echo PC
 echo ${YOUR_USB_NUM} | sudo tee /sys/bus/usb/drivers/usb/bind
 ```
 ### Hardware
-The hardware is still WIP, but I have a mostly working prototype.
+#### LEDs
+ - D2 is the **red/blue** status LED it will be **blue** when the in passthrough mode, and **red** when the USB3 controller is reading/writing to it.
+ - D1 is the **yellow** activity LED and blinks when the USB3 controller is reading/writing.
+ - D3 is the **red** power LED and is active when the USB3 controller has power.
+
+ **NOTE**: The **red** power LED will not be on if the USB cable isn't 5V providing power.
+
+
 ![Front image of PCB](https://github.com/Mr-Bossman/SD_Swap/blob/master/images/Front.jpg?raw=true)
 ![Back image of PCB](https://github.com/Mr-Bossman/SD_Swap/blob/master/images/Back.jpg?raw=true)
 <!--
 ![Front image of rendered PCB](https://github.com/Mr-Bossman/SD_Swap/blob/master/images/Rendered_Front.jpg?raw=true)
 ![Back image of rendered PCB](https://github.com/Mr-Bossman/SD_Swap/blob/master/images/Rendered_Back.jpg?raw=true)
 -->
 
-### About
-After seeing the [SDWire](https://wiki.tizen.org/SDWire) project I was disappointed by the complexity as well as the lack of USB3. So this project is uses the REALTEK RTS5306E which many USB3 to SD adapers implement, the chip has suspend functionality which we will use as a GPIO for switching hosts. The suspend option will shut off the SD cards power but not the controllers; it also has build-in RW protection as to finnish writes before switching to the SBC
-
-The SDWire project uses a USB to GPIO chip for this, but they have 2 power controlled USB ports on the board as well as the above mentioned method.
+### TODO
+ - write script for Windows and OSX.
+ - Edit pick n' place csv
+ - Label stat leds
+ - Add use switching regulator
+ - Add E-Fuse
+ - Update readme

TODO

@@ -1,6 +1,5 @@
 Edit pick n' place csv
 Label stat leds
-regen sch and images
 Add use switching regulator
 Add E-Fuse
 Update readme