raspi: add raspberry pi hardware overview

bluekitchen · Jan 22, 2019 · 84b427c · 84b427c
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commit 84b427c
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diff --git a/port/raspi/README.md b/port/raspi/README.md
@@ -95,6 +95,18 @@ Copy one of the examples to the Rasperry Pi and just run them. BTstack will powe
 	BTstack counter 0001
 	BTstack up and running at B8:27:EB:27:AF:56
 
+## Bluetooth Hardware Overview
+
+Model                    | Bluetooth Controller                                    | UART Type | UART Flowcontrol | BT_REG_EN   | HCI Transport | Baudrate
+-------------------------|---------------------------------------------------------|-----------|------------------|-------------|---------------|----------
+Older                    | None                                                    |           |                  |             |               |
+Pi 3 Model A, Model B    | [CYW43438](http://www.cypress.com/file/298076/download) | Hardware  | No               | 128         | H5            | 921600
+Pi 3 Model A+, Model B + | [CYW43455](http://www.cypress.com/file/358916/download) | Hardware  | Yes              | 129 (See 1) | H4            | 921600 (See 2)
+Pi Zero W                | [CYW43438](http://www.cypress.com/file/298076/download) | Hardware  | Yes              | 45          | H4            | 921600
+
+1. Model A+/B+ have BT_REG_EN AND WL_REG_EN on the same (virtual) GPIO 129. A Bluetooth Controller power cycle also shuts down Wifi (temporarily). BTstack avoids a power cycle on A+/B+.
+2. Model A+/B+ support 3 mbps baudrate. Not enabled/activated yet.
+
 ## TODO
 - Raspberry Pi Zero W: Check if higher baud rate can be used, 3 mbps does not work.
 - Raspberry + RedBear IoT pHAT (AP6212A = BCM4343) port: IoT pHAT need to get detected and the UART configured appropriately.