Fix flash/monitoring of 26mhz targets (#584)

* feat: Remove InvalidSerialRead Err

* style: Remove unconstructeds structs

* feat: Update monitoring baudrate when using stub

* feat: Update stubs to support 26MHz targets

* docs: Update changelog

Author: SergioGasquez

CHANGELOG.md

@@ -27,13 +27,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
-- Fixed printing panic backtraces when using `esp-println` and `defmt` (#496)
-- Fixed `defmt` parsing when data is read in parts (#503)
+- Fix printing panic backtraces when using `esp-println` and `defmt` (#496)
+- Fix `defmt` parsing when data is read in parts (#503)
 - Use partition table instead of hard-coded values for the location of partitions (#516)
-- Fixed a missed `flush` call that may be causing communication errors (#521)
+- Fix a missed `flush` call that may be causing communication errors (#521)
 - Fix "SHA-256 comparison failed: [...] attempting to boot anyway..." (#567)
 - Windows: Update RST/DTR order to avoid issues.
 - Tolerate non-utf8 data in boot detection (#573)
+- Fix flash/monitoring of 26mhz targets (#584)
 
 ### Changed
 
@@ -42,6 +43,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Unify configuration methods (#551)
 - MSRV bumped to `1.73.0` (#578)
 - Improved symbol resolving (#581)
+- Update ESP32-C2 stub (#584)
 
 ### Removed
 

cargo-espflash/src/main.rs

@@ -344,10 +344,8 @@ fn flash(args: FlashArgs, config: &Config) -> Result<()> {
         let pid = flasher.get_usb_pid()?;
 
         // The 26MHz ESP32-C2's need to be treated as a special case.
-        let default_baud = if chip == Chip::Esp32c2
-            && args.connect_args.no_stub
-            && target_xtal_freq == XtalFrequency::_26Mhz
-        {
+        let default_baud = if chip == Chip::Esp32c2 && target_xtal_freq == XtalFrequency::_26Mhz {
+            // 115_200 * 26 MHz / 40 MHz = 74_880
             74_880
         } else {
             115_200

espflash/resources/stubs/stub_flasher_32c2.toml

@@ -279,10 +279,8 @@ fn flash(args: FlashArgs, config: &Config) -> Result<()> {
         let pid = flasher.get_usb_pid()?;
 
         // The 26MHz ESP32-C2's need to be treated as a special case.
-        let default_baud = if chip == Chip::Esp32c2
-            && args.connect_args.no_stub
-            && target_xtal_freq == XtalFrequency::_26Mhz
-        {
+        let default_baud = if chip == Chip::Esp32c2 && target_xtal_freq == XtalFrequency::_26Mhz {
+            // 115_200 * 26 MHz / 40 MHz = 74_880
             74_880
         } else {
             115_200

espflash/src/bin/espflash.rs

@@ -439,9 +439,9 @@ pub fn serial_monitor(args: MonitorArgs, config: &Config) -> Result<()> {
 
     // The 26MHz ESP32-C2's need to be treated as a special case.
     let default_baud = if chip == Chip::Esp32c2
-        && args.connect_args.no_stub
         && target.crystal_freq(flasher.connection())? == XtalFrequency::_26Mhz
     {
+        // 115_200 * 26 MHz / 40 MHz = 74_880
         74_880
     } else {
         115_200

espflash/src/cli/mod.rs

@@ -131,14 +131,9 @@ impl Connection {
                 Ok(_) => {
                     return Ok(());
                 }
-                Err(e) => match e {
-                    Error::InvalidSerialRead => {
-                        return Err(Error::InvalidSerialRead);
-                    }
-                    _ => {
-                        debug!("Failed to reset, error {:#?}, retrying", e);
-                    }
-                },
+                Err(e) => {
+                    debug!("Failed to reset, error {:#?}, retrying", e);
+                }
             }
         }
 
@@ -173,9 +168,6 @@ impl Connection {
             }
 
             let read_slice = String::from_utf8_lossy(&buff[..read_bytes as usize]).into_owned();
-            if !read_slice.contains("boot") {
-                return Err(Error::InvalidSerialRead);
-            }
 
             let pattern = Regex::new(r"boot:(0x[0-9a-fA-F]+)(.*waiting for download)?").unwrap();
 

espflash/src/connection/mod.rs

@@ -95,13 +95,6 @@ pub enum Error {
     #[error("The provided bootloader binary is invalid")]
     InvalidBootloader,
 
-    #[error("Invalid byte sequence read from the serial port while trying to detect Boot Mode")]
-    #[diagnostic(
-        code(espflash::invalid_serial_read),
-        help("This might be caused by a xtal frequency mismatch")
-    )]
-    InvalidSerialRead,
-
     #[error("Specified bootloader path is not a .bin file")]
     #[diagnostic(code(espflash::invalid_bootloader_path))]
     InvalidBootloaderPath,

espflash/src/error.rs

@@ -11,9 +11,9 @@ use std::{
     path::{Path, PathBuf},
     str::FromStr,
     thread::sleep,
+    time::Duration,
 };
 
-use bytemuck::{Pod, Zeroable, __core::time::Duration};
 use esp_idf_part::PartitionTable;
 use log::{debug, info, warn};
 use md5::{Digest, Md5};
@@ -497,32 +497,6 @@ impl SpiAttachParams {
 const TRY_SPI_PARAMS: [SpiAttachParams; 2] =
     [SpiAttachParams::default(), SpiAttachParams::esp32_pico_d4()];
 
-#[derive(Zeroable, Pod, Copy, Clone, Debug)]
-#[repr(C)]
-struct BlockParams {
-    size: u32,
-    sequence: u32,
-    dummy1: u32,
-    dummy2: u32,
-}
-
-#[derive(Zeroable, Pod, Copy, Clone, Debug)]
-#[repr(C)]
-struct BeginParams {
-    size: u32,
-    blocks: u32,
-    block_size: u32,
-    offset: u32,
-    encrypted: u32,
-}
-
-#[derive(Zeroable, Pod, Copy, Clone)]
-#[repr(C)]
-struct EntryParams {
-    no_entry: u32,
-    entry: u32,
-}
-
 /// Information about the connected device
 #[derive(Debug, Clone)]
 pub struct DeviceInfo {

espflash/src/flasher/mod.rs

@@ -17,6 +17,7 @@ const FLASH_RANGES: &[Range<u32>] = &[
     0x3f40_0000..0x3f80_0000, // DROM
 ];
 
+// UART0_BASE_REG + 0x14
 const UART_CLKDIV_REG: u32 = 0x3ff4_0014;
 const UART_CLKDIV_MASK: u32 = 0xfffff;
 

espflash/src/targets/esp32.rs

@@ -20,6 +20,7 @@ const FLASH_RANGES: &[Range<u32>] = &[
     0x3c00_0000..0x3c40_0000, // DROM
 ];
 
+// UART0_BASE_REG + 0x14
 const UART_CLKDIV_REG: u32 = 0x6000_0014;
 const UART_CLKDIV_MASK: u32 = 0xfffff;