README: update

README.md

@@ -3,42 +3,44 @@
 
 # Stabilizer Firmware
 
+## Hardware
+
+[![Hardware](https://github.com/sinara-hw/Stabilizer/wiki/Stabilizer_v1.0_top_small.jpg)](https://github.com/sinara-hw/Stabilizer)
+
+## Applications
+
+The Stabilizer firmware offeres a library of hardware and software functionality
+exposing input/output, timing, and digital signal processing features.
+An application can compose and configure these hardware and software components
+to implement different use cases. Several applications are provides by default
+
+### Dual-IIR
+
 ![Flow diagram](stabilizer_pid.svg)
 
-![Hardware](https://github.com/sinara-hw/Stabilizer/wiki/Stabilizer_v1.0_top_small.jpg)
-
-## Features
-
 * dual channel
 * SPI ADC
 * SPI DAC
-* 500 kHz rate, timed sampling
-* 2 µs latency, unmatched between channels
+* up to 800 kHz rate, timed sampling
+* down to 2 µs latency
 * f32 IIR math
 * generic biquad (second order) IIR filter
 * anti-windup
 * derivative kick avoidance
 
-## Limitations/TODOs
+### Lockin external
 
-* Fixed AFE gains
-* The IP and MAC address are [hardcoded](src/hardware/configuration.rs)
-* Expose configurable limits
-* 100Base-T only
-* Digital IO, GPIO header, AFE header, EEM header are not handled
-
-## Hardware
-
-See https://github.com/sinara-hw/Stabilizer
+### Lockin internal
 
 ## Minimal bootstrapping documentation
 
 * Clone or download this
 * Get [rustup](https://rustup.rs/)
-* Get [cargo-binutils](https://github.com/rust-embedded/cargo-binutils/)
 * `rustup target add thumbv7em-none-eabihf`
 * `cargo build --release`
-* Do not try the debug (default) mode. It is guaranteed to panic.
+* When using debug (non `--release`) mode, increase the sample interval significantly.
+  The added error checking code and missing optimizations may lead to the code
+  missing deadlines and panicing.
 
 ### Using Cargo-embed
 
@@ -55,30 +57,24 @@ See https://github.com/sinara-hw/Stabilizer
 * `openocd -f stabilizer.cfg` and leave it running
 * `cargo run --release`
 
-[^swd]: Build a cable: connect a standard 8 conductor ribbon with the wires numbered
-  `1-8` to the pins on the St-Link v2 single row 2.54mm connector as `647513(82)`
-  (`(i)` marks an unused wire)
-  and to the [1.27mm dual row](https://www.digikey.de/short/p41h0n) on Stabilizer as `657483x2x1`
-  (`x` marks an unused pin, enumeration is standard for dual row, as in the
-  schematic).
-  It's just folding the ribbon between wires `5` and `6`. The signals on the ribbon
-  are then `NRST,TDI,TDO,TCK,TMS,3V3,GND,GND`.
-
 ### Using USB-DFU
 
 * Install the DFU USB tool (`dfu-util`)
 * Connect to the Micro USB connector below the RJ45
 * Short JC2/BOOT
+* Get [cargo-binutils](https://github.com/rust-embedded/cargo-binutils/)
 * `cargo objcopy --release --bin dual-iir -- -O binary dual-iir.bin` or `arm-none-eabi-objcopy -O binary target/thumbv7em-none-eabihf/release/dual-iir dual-iir.bin`
 * `dfu-util -a 0 -s 0x08000000:leave -D dual-iir.bin`
 
 ### Using ST-Link virtual mass storage
 
+* Get [cargo-binutils](https://github.com/rust-embedded/cargo-binutils/)
 * `cargo objcopy --release --bin dual-iir -- -O binary dual-iir.bin` or `arm-none-eabi-objcopy -O binary target/thumbv7em-none-eabihf/release/dual-iir dual-iir.bin`
 * Connect the ST-Link debugger
 * copy `dual-iir.bin` to the `NODE_H743ZI` USB disk
 
 ## Protocol
 
-Stabilizer can be configured via MQTT under the topic `stabilizer/settings/<setting>`. Refer to
+Stabilizer can be configured via MQTT. Refer to
 [`miniconf`](https://github.com/quartiq/miniconf) for more information about topics.
+A basic command line interface is available in [`miniconf.py`](miniconf.py).