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Update README for updated instructions

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README.md
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## General Instructions
The ENC424J600 Ethernet controller module supports operation in one of the following interfaces: Serial Peripheral Interace (SPI), or Parallel Slave Port (PSP). This Rust library currently only supports the use of SPI for STM32F4xx microcontrollers.
The ENC424J600 Ethernet controller module supports operation in one of the following interfaces: Serial Peripheral Interace (SPI), or Parallel Slave Port (PSP). This Rust library supports the use of SPI for all embedded systems compatible with the Rust [`embedded-hal`](https://crates.io/crates/embedded-hal) crate.
On ENC424J600, the **INTn/SPISEL** pin is multiplexed with an **interrupt function** (INTn) and an **interface selection function** (SPISEL). During power-up, to select SPI as the interface, INTn/SPISEL needs to latch a logic high for 1-10 us, driven outside of ENC424J600. After ENC424J600 has been initialsed, the same pin can be used to indicate occurrence of interrupt with a logic low, or idling with a logic high, driven by ENC424J600. Therefore, on the microcontroller side, the mode of driving the pin should be chosen by design: it should be **tri-stated** if interrupt is enabled, or **push-pull** otherwise.
To help facilitate the user, we provide a [`nix-shell`](https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html#idm140737320154096) environment and a set of Shell scripts to perform certain tasks, such as creating a ready-to-use [`tmux`](https://github.com/tmux/tmux/wiki) session for debugging an STM32 microcontroller, as well as compiling and running STM32-based examples.
### Instructions for STM32F407 Examples
These examples assume that the **SPI1** port is connected to the Ethernet module, and the **GPIO PA1** pin is connected to its SPISEL pin. Since no interrupts are involved, GPIO PA1 is configured as a **push-pull** output to only initialise the controller. The program output is logged via ITM stimulus port 0.
Currently, the provided examples are for STM32F4xx microcontrollers using the Rust [`stm32f4xx-hal`](https://crates.io/crates/stm32f4xx-hal) crate. These examples assume that the **SPI1** port is connected to the Ethernet module, and the **GPIO PA1** pin is connected to its SPISEL pin. Since no interrupts are involved, GPIO PA1 is configured as a **push-pull** output to only initialise the controller. The program output is logged via ITM stimulus port 0.
## Examples
@ -27,18 +29,20 @@ This program demonstrates the Ethernet TX capability on an STM32F407 board. Once
#### How-to
1. Connect your STM32F407 device to the computer. Without changing any code, you may use an STLink V2 debugger. Then, on a console window, run OpenOCD and debug the example program:
1. Connect your STM32F407 device to the computer. Without changing any code, you may use an STLink V2 debugger.
2. Create a `tmux` session for debugging:
```sh
$ nix-shell
[nix-shell]$ run-openocd-f4x
[nix-shell]$ run-tmux-env
```
3. When the `tmux` session is ready, on the top-right pane, compile and run the example program:
```sh
[nix-shell]$ tx_stm32f407
```
2. On a separate console window, run [`itmdump`](https://docs.rs/itm/) to observe the output:
```sh
$ nix-shell
[nix-shell]$ run-itmdump-follow
```
4. Observe the output on the left pane. If you wish to debug manually, run `run-help` to see the list of all available commands.
#### Expected Output
@ -70,25 +74,27 @@ This program demonstrates the TCP connectivity using **smoltcp** on an STM32F407
#### How-to
1. Connect your STM32F407 device to the computer. Without changing any code, you may use an STLink V2 debugger. Then, on a console window, run OpenOCD and debug the example program. Choose your own IPv4 address and prefix length:
1. Connect your STM32F407 device to the computer. Without changing any code, you may use an STLink V2 debugger.
2. Create a `tmux` session for debugging:
```sh
$ nix-shell
[nix-shell]$ run-openocd-f4x
[nix-shell]$ run-tmux-env
```
3. When the `tmux` session is ready, on the top-right pane, compile and run the example program. Choose your own IPv4 address and prefix length:
```sh
[nix-shell]$ tcp_stm32f407 <ip> <prefix>
```
2. On a separate console window, run [`itmdump`](https://docs.rs/itm/) to observe the output:
```sh
$ nix-shell
[nix-shell]$ run-itmdump-follow
```
3. To test the TCP ports, open another console window and use utilities like NetCat (`nc`):
4. To test the TCP ports, switch to the bottom-right pane (with <kbd>Ctrl</kbd>+<kbd>B</kbd>, followed by an arrow key) and use utilities like NetCat (`nc`):
```sh
$ nc <ip> <port-number>
```
Multiple instances of Netcat can run to use all the ports simultaneously. Use Ctrl+C to disconnect from the port manually (especially for the greeting port).
5. Observe the output on the left pane. If you wish to debug manually, run `run-help` to see the list of all available commands.
#### Expected Output
(Note: the IP address, MAC address and timestamps shown below are examples only.)