From 5ddac977a9db7e966969ec8e912af0b903f9539d Mon Sep 17 00:00:00 2001
From: spacemeowx2 <spacemeowx2@gmail.com>
Date: Thu, 3 Dec 2020 21:47:28 +0800
Subject: [PATCH] Add handshake code

---
 Cargo.lock                                   | 710 +++++++++++++++++++
 README.md                                    |   2 +
 blflash/Cargo.toml                           |  19 +-
 blflash/src/chip/bl602/eflash_loader_40m.bin | Bin 0 -> 29264 bytes
 blflash/src/chip/bl602/mod.rs                |   1 +
 blflash/src/chip/mod.rs                      |   1 +
 blflash/src/config.rs                        |  34 +
 blflash/src/connection.rs                    | 101 +++
 blflash/src/error.rs                         |  50 ++
 blflash/src/flasher.rs                       |  84 +++
 blflash/src/lib.rs                           |   9 +
 blflash/src/main.rs                          |  51 +-
 cargo-blflash/Cargo.toml                     |   7 +-
 13 files changed, 1064 insertions(+), 5 deletions(-)
 create mode 100644 blflash/src/chip/bl602/eflash_loader_40m.bin
 create mode 100644 blflash/src/chip/bl602/mod.rs
 create mode 100644 blflash/src/chip/mod.rs
 create mode 100644 blflash/src/config.rs
 create mode 100644 blflash/src/connection.rs
 create mode 100644 blflash/src/error.rs
 create mode 100644 blflash/src/flasher.rs
 create mode 100644 blflash/src/lib.rs

diff --git a/Cargo.lock b/Cargo.lock
index 628bfbb..836e1c3 100644
--- a/Cargo.lock
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diff --git a/README.md b/README.md
index aa46a22..6da921f 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,5 @@
 BL602 serial flasher
 
 Inspired by https://github.com/esp-rs/espflash
+
+ISP documentation: https://github.com/bouffalolab/bl_docs/tree/main/BL602_ISP
diff --git a/blflash/Cargo.toml b/blflash/Cargo.toml
index 49ad5c1..be49478 100644
--- a/blflash/Cargo.toml
+++ b/blflash/Cargo.toml
@@ -4,6 +4,23 @@ version = "0.1.0"
 authors = ["spacelin <spacelin@tencent.com>"]
 edition = "2018"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[[bin]]
+name = "blflash"
+path = "src/main.rs"
+
+[lib]
 
 [dependencies]
+serial = "0.4"
+xmas-elf = "0.7.0"
+main_error = "0.1.1"
+pico-args = "0.3.4"
+serde = { version = "1.0", features = ["derive"] }
+toml = "0.5"
+directories-next = "1.0.1"
+thiserror = "1.0.22"
+indicatif = "0.15.0"
+log = "0.4.11"
+env_logger = "0.8.2"
+deku = "0.9.1"
+byteorder = "1.3.4"
diff --git a/blflash/src/chip/bl602/eflash_loader_40m.bin b/blflash/src/chip/bl602/eflash_loader_40m.bin
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literal 0
HcmV?d00001

diff --git a/blflash/src/chip/bl602/mod.rs b/blflash/src/chip/bl602/mod.rs
new file mode 100644
index 0000000..eb2f090
--- /dev/null
+++ b/blflash/src/chip/bl602/mod.rs
@@ -0,0 +1 @@
+pub const _EFLASH_LOADER: &'static [u8] = include_bytes!("eflash_loader_40m.bin");
diff --git a/blflash/src/chip/mod.rs b/blflash/src/chip/mod.rs
new file mode 100644
index 0000000..6b79f9b
--- /dev/null
+++ b/blflash/src/chip/mod.rs
@@ -0,0 +1 @@
+mod bl602;
diff --git a/blflash/src/config.rs b/blflash/src/config.rs
new file mode 100644
index 0000000..dc64cac
--- /dev/null
+++ b/blflash/src/config.rs
@@ -0,0 +1,34 @@
+use directories_next::ProjectDirs;
+use serde::Deserialize;
+use std::fs::read;
+
+#[derive(Debug, Deserialize, Default)]
+pub struct Config {
+    #[serde(default)]
+    pub connection: Connection,
+    #[serde(default)]
+    pub build: Build,
+}
+
+#[derive(Debug, Deserialize, Default)]
+pub struct Connection {
+    pub serial: Option<String>,
+}
+
+#[derive(Debug, Deserialize, Default)]
+pub struct Build {
+    pub tool: Option<String>,
+}
+
+impl Config {
+    /// Load the config from config file
+    pub fn load() -> Self {
+        let dirs = ProjectDirs::from("rs", "esp", "espflash").unwrap();
+        let file = dirs.config_dir().join("espflash.toml");
+        if let Ok(data) = read(&file) {
+            toml::from_slice(&data).unwrap()
+        } else {
+            Self::default()
+        }
+    }
+}
\ No newline at end of file
diff --git a/blflash/src/connection.rs b/blflash/src/connection.rs
new file mode 100644
index 0000000..b363c15
--- /dev/null
+++ b/blflash/src/connection.rs
@@ -0,0 +1,101 @@
+use std::io::{Read, Write, Cursor};
+use std::thread::sleep;
+use std::time::Duration;
+use crate::{Error, RomError};
+use byteorder::{ReadBytesExt, LittleEndian};
+
+use serial::{BaudRate, SerialPort, SerialPortSettings};
+
+pub const DEFAULT_BAUDRATE: BaudRate = BaudRate::Baud115200;
+
+pub struct Connection {
+    serial: Box<dyn SerialPort>,
+    baud_rate: BaudRate,
+}
+
+impl Connection {
+    pub fn new(serial: impl SerialPort + 'static) -> Self {
+        Connection {
+            serial: Box::new(serial),
+            baud_rate: DEFAULT_BAUDRATE,
+        }
+    }
+
+    pub fn reset_to_flash(&mut self) -> Result<(), Error> {
+        self.serial.set_rts(true)?;
+        sleep(Duration::from_millis(50));
+        self.serial.set_dtr(true)?;
+        sleep(Duration::from_millis(50));
+        self.serial.set_dtr(false)?;
+        sleep(Duration::from_millis(50));
+        self.serial.set_rts(false)?;
+        sleep(Duration::from_millis(50));
+
+        Ok(())
+    }
+
+    pub fn set_timeout(&mut self, timeout: Duration) -> Result<(), Error> {
+        self.serial.set_timeout(timeout)?;
+        Ok(())
+    }
+
+    pub fn set_baud(&mut self, speed: BaudRate) -> Result<(), Error> {
+        self.baud_rate = speed;
+        self.serial
+            .reconfigure(&|setup: &mut dyn SerialPortSettings| setup.set_baud_rate(speed))?;
+        Ok(())
+    }
+
+    pub fn with_timeout<T, F: FnMut(&mut Connection) -> Result<T, Error>>(
+        &mut self,
+        timeout: Duration,
+        mut f: F,
+    ) -> Result<T, Error> {
+        let old_timeout = self.serial.timeout();
+        self.serial.set_timeout(timeout)?;
+        let result = f(self);
+        self.serial.set_timeout(old_timeout)?;
+        result
+    }
+
+    fn read_exact(&mut self, len: usize) -> Result<Vec<u8>, Error> {
+        let mut buf = vec![0u8; len];
+        self.serial.read_exact(&mut buf)?;
+        Ok(buf)
+    }
+
+    pub fn read_response(&mut self, len: usize) -> Result<Vec<u8>, Error> {
+        let resp = self.read_exact(2)?;
+        log::trace!("read_response {}", String::from_utf8_lossy(&resp).to_string());
+        match &resp[0..2] {
+            // OK
+            [0x4f, 0x4b] => {
+                if len > 0 {
+                    self.read_exact(len)
+                } else {
+                    Ok(vec![])
+                }
+            },
+            // FL
+            [0x46, 0x4c] => {
+                let code = self.read_exact(2)?;
+                let mut reader = Cursor::new(code);
+                let code = reader.read_u16::<LittleEndian>()?;
+                Err(Error::RomError(RomError::from(code)))
+            },
+            _ => Err(Error::RespError)
+        }
+    }
+
+    pub fn calc_duration_length(&mut self, duration: Duration) -> usize {
+        self.baud_rate.speed() / 10 / 1000 * (duration.as_millis() as usize)
+    }
+
+    pub fn write_all(&mut self, buf: &[u8]) -> Result<(), Error> {
+        Ok(self.serial.write_all(buf)?)
+    }
+
+    pub fn flush(&mut self) -> Result<(), Error> {
+        Ok(self.serial.flush()?)
+    }
+}
diff --git a/blflash/src/error.rs b/blflash/src/error.rs
new file mode 100644
index 0000000..900baf7
--- /dev/null
+++ b/blflash/src/error.rs
@@ -0,0 +1,50 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+#[non_exhaustive]
+pub enum Error {
+    #[error("IO error while using serial port: {0}")]
+    Serial(#[from] serial::core::Error),
+    #[error("Failed to connect to the device")]
+    ConnectionFailed,
+    #[error("Timeout while running command")]
+    Timeout,
+    #[error("Invalid response header")]
+    RespError,
+    #[error("Packet to large for buffer")]
+    OverSizedPacket,
+    #[error("elf image is not valid")]
+    InvalidElf,
+    #[error("elf image can not be ran from ram")]
+    ElfNotRamLoadable,
+    #[error("chip not recognized")]
+    UnrecognizedChip,
+    #[error("flash chip not supported, flash id: {0:#x}")]
+    UnsupportedFlash(u8),
+    #[error("ROM error")]
+    RomError(RomError),
+    #[error("Parse error")]
+    ParseError(#[from] deku::error::DekuError),
+}
+
+impl From<std::io::Error> for Error {
+    fn from(err: std::io::Error) -> Self {
+        Self::Serial(serial::core::Error::from(err))
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+#[allow(dead_code)]
+pub enum RomError {
+    Success,
+    Other(u16),
+}
+
+impl From<u16> for RomError {
+    fn from(raw: u16) -> Self {
+        match raw {
+            0x00 => RomError::Success,
+            _ => RomError::Other(raw),
+        }
+    }
+}
diff --git a/blflash/src/flasher.rs b/blflash/src/flasher.rs
new file mode 100644
index 0000000..9e60c00
--- /dev/null
+++ b/blflash/src/flasher.rs
@@ -0,0 +1,84 @@
+use crate::connection::{Connection, DEFAULT_BAUDRATE};
+use crate::Error;
+use serial::{BaudRate, SerialPort};
+use std::time::{Duration, Instant};
+use deku::prelude::*;
+
+pub struct Flasher {
+    connection: Connection,
+    bootrom_info: protocol::BootInfo,
+}
+
+impl Flasher {
+    pub fn connect(
+        serial: impl SerialPort + 'static,
+        speed: Option<BaudRate>,
+    ) -> Result<Self, Error> {
+        let mut flasher = Flasher {
+            connection: Connection::new(serial),
+            bootrom_info: protocol::BootInfo::default(),
+        };
+        flasher.connection.set_baud(speed.unwrap_or(DEFAULT_BAUDRATE))?;
+        flasher.start_connection()?;
+        flasher.connection.set_timeout(Duration::from_secs(3))?;
+        flasher.bootrom_info = flasher.get_boot_info()?;
+
+        Ok(flasher)
+    }
+
+    fn get_boot_info(&mut self) -> Result<protocol::BootInfo, Error> {
+        self.connection.write_all(protocol::GET_BOOT_INFO)?;
+        let data = self.connection.read_response(1 + 1 + 4 + 16)?;
+        let (_, data) = protocol::BootInfo::from_bytes((&data, 0))?;
+        Ok(data)
+    }
+
+    fn handshake(&mut self) -> Result<(), Error> {
+        self.connection
+            .with_timeout(Duration::from_millis(200), |connection| {
+                let len = connection.calc_duration_length(Duration::from_millis(5));
+                log::trace!("5ms send count {}", len);
+                let data: Vec<u8> = std::iter::repeat(0x55u8)
+                    .take(len).collect();
+                let start = Instant::now();
+                connection.write_all(&data)?;
+                connection.flush()?;
+                log::trace!("handshake sent elapsed {:?}", start.elapsed());
+                for _ in 0..10 {
+                    if connection.read_response(0).is_ok() {
+                        return Ok(())
+                    }
+                }
+                Err(Error::Timeout)
+            })
+    }
+
+    fn start_connection(&mut self) -> Result<(), Error> {
+        log::info!("Start connection...");
+        self.connection.reset_to_flash()?;
+        for i in 1..=10 {
+            self.connection.flush()?;
+            if self.handshake().is_ok() {
+                log::info!("Connection Succeed");
+                return Ok(());
+            } else {
+                log::debug!("Retry {}", i);
+            }
+        }
+        Err(Error::ConnectionFailed)
+    }
+
+}
+
+mod protocol {
+    use deku::prelude::*;
+
+    pub const GET_BOOT_INFO: &[u8] = &[0x10, 0x00, 0x00, 0x00];
+
+    #[derive(Debug, DekuRead, Default)]
+    #[deku(magic = b"\x14\x00")]
+    pub struct BootInfo {
+        bootrom_version: u32,
+        otp_info: [u8; 16],
+    }
+}
diff --git a/blflash/src/lib.rs b/blflash/src/lib.rs
new file mode 100644
index 0000000..44db28a
--- /dev/null
+++ b/blflash/src/lib.rs
@@ -0,0 +1,9 @@
+mod config;
+mod flasher;
+mod connection;
+mod chip;
+mod error;
+
+pub use config::Config;
+pub use flasher::Flasher;
+pub use error::{Error, RomError};
diff --git a/blflash/src/main.rs b/blflash/src/main.rs
index e7a11a9..1912d4f 100644
--- a/blflash/src/main.rs
+++ b/blflash/src/main.rs
@@ -1,3 +1,50 @@
-fn main() {
-    println!("Hello, world!");
+use std::fs::read;
+
+use blflash::{Config, Flasher};
+use main_error::MainError;
+use pico_args::Arguments;
+use serial::BaudRate;
+use env_logger::Env;
+
+fn help() -> Result<(), MainError> {
+    println!("Usage: espflash [--board-info] [--ram] <serial> <elf image>");
+    Ok(())
+}
+
+fn main() -> Result<(), MainError> {
+    env_logger::Builder::from_env(Env::default().default_filter_or("blflash=trace")).init();
+    let mut args = Arguments::from_env();
+    let config = Config::load();
+
+    log::trace!("trace on");
+
+    if args.contains(["-h", "--help"]) {
+        return help();
+    }
+
+    let _ram = args.contains("--ram");
+
+    let mut serial: Option<String> = args.free_from_str()?;
+    let mut elf: Option<String> = args.free_from_str()?;
+
+    if elf.is_none() && config.connection.serial.is_some() {
+        elf = serial.take();
+        serial = config.connection.serial;
+    }
+
+    let serial: String = match serial {
+        Some(serial) => serial,
+        _ => return help(),
+    };
+
+    let serial = serial::open(&serial)?;
+    let _flasher = Flasher::connect(serial, Some(BaudRate::BaudOther(500_000)))?;
+
+    let input: String = match elf {
+        Some(input) => input,
+        _ => return help(),
+    };
+    let _input_bytes = read(&input)?;
+
+    Ok(())
 }
diff --git a/cargo-blflash/Cargo.toml b/cargo-blflash/Cargo.toml
index b8c1ce3..aba2f35 100644
--- a/cargo-blflash/Cargo.toml
+++ b/cargo-blflash/Cargo.toml
@@ -4,6 +4,9 @@ version = "0.1.0"
 authors = ["spacelin <spacelin@tencent.com>"]
 edition = "2018"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
+cargo-project = "0.2.4"
+blflash = { version = "0.1.0", path = "../blflash" }
+main_error = "0.1.1"
+pico-args = "0.3.4"
+serial = "0.4"