README: init

README.md

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+# Thermostat v2 prototype firmware
+
+## Building
+
+### Debian-based systems (tested on Ubuntu 19.10)
+
+- install git, clone this repository
+- install [rustup](https://rustup.rs/)
+
+```shell
+rustup toolchain install nightly
+rustup update
+rustup target add thumbv7em-none-eabihf --toolchain nightly
+rustup default nightly
+cargo build --release
+```
+
+The built ELF file will be at `target/thumbv7em-none-eabihf/release/thermostat`
+
+
+## Network
+
+### Setup
+
+Ethernet, IP: 192.168.1.26/24
+
+Use netcat to connect to port 23/tcp (telnet)
+
+telnet clients send binary data after connect. Enter \n once to
+invalidate the first line of input.
+
+
+### Reading ADC input
+
+Set report mode to `on` for a continuous stream of input data.
+
+The scope of this setting is per TCP session.
+
+
+### Commands
+
+| Syntax                           | Function                                        |
+| ---                              | ---                                             |
+| `report`                         | Show current input                              |
+| `report mode`                    | Show current report mode                        |
+| `report mode <off/on>`           | Set report mode                                 |
+| `pwm`                            | Show current PWM settings                       |
+| `pwm <0/1> max_i_pos <width>`    | Set PWM duty cycle for **max_i_pos** to *width* |
+| `pwm <0/1> max_i_neg <width>`    | Set PWM duty cycle for **max_i_neg** to *width* |
+| `pwm <0/1> max_v <width>`        | Set PWM duty cycle for **max_v** to *width*     |
+| `pwm <0/1> <width>`              | Disengage PID, set **i_set** DAC to *width*     |
+| `pwm <0/1> pid`                  | Set PWM to be controlled by PID                 |
+| `pid`                            | Show PID configuration                          |
+| `pid <0/1> target <value>`       | Set the PID controller target                   |
+| `pid <0/1> kp <value>`           | Set proportional gain                           |
+| `pid <0/1> ki <value>`           | Set integral gain                               |
+| `pid <0/1> kd <value>`           | Set differential gain                           |
+| `pid <0/1> output_min <value>`   | Set mininum output                              |
+| `pid <0/1> output_max <value>`   | Set maximum output                              |
+| `pid <0/1> integral_min <value>` | Set integral lower bound                        |
+| `pid <0/1> integral_max <value>` | Set integral upper bound                        |
+| `s-h`                            | Show Steinhart-Hart equation parameters         |
+| `s-h <0/1> <t/b/r0> <value>`     | Set Steinhart-Hart parameter for a channel      |
+| `postfilter <0/1> rate <rate>`   | Set postfilter output data rate                 |