Create a basic transport layer

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "wifi-nina"
+version = "0.1.0"
+authors = ["David Flemström <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+embedded-hal = { version = "0.2.3", features = ["unproven"] }
+log = { version = "0.4.8", default-features = false }
+nb = { version = "0.1.2", default-features = false }
+no-std-net = { version = "0.3.0", default-features = false }
+num_enum = { version = "0.4.2", default-features = false }

src/command.rs

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+#[derive(Clone, Copy, Debug, Eq, PartialEq, num_enum::IntoPrimitive, num_enum::TryFromPrimitive)]
+#[repr(u8)]
+pub enum Command {
+    SetNetCmd = 0x10,
+    SetPassphraseCmd = 0x11,
+    SetKeyCmd = 0x12,
+    SetIpConfigCmd = 0x14,
+    SetDnsConfigCmd = 0x15,
+    SetHostnameCmd = 0x16,
+    SetPowerModeCmd = 0x17,
+    SetApNetCmd = 0x18,
+    SetApPassphraseCmd = 0x19,
+    SetDebugCmd = 0x1A,
+    GetTemperatureCmd = 0x1B,
+
+    GetConnStatusCmd = 0x20,
+    GetIpaddrCmd = 0x21,
+    GetMacaddrCmd = 0x22,
+    GetCurrSsidCmd = 0x23,
+    GetCurrBssidCmd = 0x24,
+    GetCurrRssiCmd = 0x25,
+    GetCurrEnctCmd = 0x26,
+    ScanNetworks = 0x27,
+    StartServerTcpCmd = 0x28,
+    GetStateTcpCmd = 0x29,
+    DataSentTcpCmd = 0x2A,
+    AvailDataTcpCmd = 0x2B,
+    GetDataTcpCmd = 0x2C,
+    StartClientTcpCmd = 0x2D,
+    StopClientTcpCmd = 0x2E,
+    GetClientStateTcpCmd = 0x2F,
+    DisconnectCmd = 0x30,
+    GetIdxRssiCmd = 0x32,
+    GetIdxEnctCmd = 0x33,
+    ReqHostByNameCmd = 0x34,
+    GetHostByNameCmd = 0x35,
+    StartScanNetworks = 0x36,
+    GetFwVersionCmd = 0x37,
+    SendDataUdpCmd = 0x39,
+    GetRemoteDataCmd = 0x3A,
+    GetTimeCmd = 0x3B,
+    GetIdxBssid = 0x3C,
+    GetIdxChannelCmd = 0x3D,
+    PingCmd = 0x3E,
+    GetSocketCmd = 0x3F,
+
+    // All command with DATA_FLAG 0x40 send a 16bit Len
+    SendDataTcpCmd = 0x44,
+    GetDatabufTcpCmd = 0x45,
+    InsertDatabufCmd = 0x46,
+
+    // regular format commands
+    SetPinMode = 0x50,
+    SetDigitalWrite = 0x51,
+    SetAnalogWrite = 0x52,
+}

src/full_duplex.rs

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+pub trait FullDuplexExt<Word>: embedded_hal::spi::FullDuplex<Word>
+where
+    Word: core::fmt::LowerHex + Copy + Default,
+{
+    fn send_exchange(&mut self, word: Word) -> Result<(), Self::Error> {
+        nb::block!(self.send(word))?;
+        log::trace!("send {:#04x}", word);
+        nb::block!(self.read())?;
+        Ok(())
+    }
+
+    fn recv_exchange(&mut self) -> Result<Word, Self::Error> {
+        nb::block!(self.send(Word::default()))?;
+        let byte = nb::block!(self.read())?;
+        log::trace!("recv {:#04x}", byte);
+        Ok(byte)
+    }
+}
+
+impl<T, Word> FullDuplexExt<Word> for T
+where
+    T: embedded_hal::spi::FullDuplex<Word>,
+    Word: core::fmt::LowerHex + Copy + Default,
+{
+}