efuse: Implement write support

Author: kyrias

Cargo.lock

@@ -50,6 +50,7 @@ log             = "0.4"
 md-5            = "0.10"
 miette          = "7.6"
 object          = "0.37"
+reed-solomon    = "0.2.1"
 regex           = { version = "1.11", optional = true }
 serde           = { version = "1.0", features = ["derive"] }
 serialport      = { version = "4.7", default-features = false, optional = true }

espflash/Cargo.toml

@@ -683,6 +683,16 @@ impl Connection {
         Ok(())
     }
 
+    /// Updates a register by applying the new value to the masked out portion
+    /// of the old value.
+    pub(crate) fn update_reg(&mut self, addr: u32, mask: u32, new_value: u32) -> Result<(), Error> {
+        let masked_new_value = new_value.checked_shl(mask.trailing_zeros()).unwrap_or(0) & mask;
+
+        let masked_old_value = self.read_reg(addr)? & !mask;
+
+        self.write_reg(addr, masked_old_value | masked_new_value, None)
+    }
+
     /// Reads a register command with a timeout.
     pub(crate) fn read(&mut self, len: usize) -> Result<Option<Vec<u8>>, Error> {
         let mut tmp = Vec::with_capacity(1024);

espflash/src/connection/mod.rs

@@ -367,6 +367,22 @@ pub enum Error {
     /// Specified eFuse block does not exist
     #[error("specified eFuse block does not exist: {0}")]
     InvalidEfuseBlock(u32),
+
+    /// Unsupported crystall frequency
+    #[error("Unsupported crystal frequency: {0}")]
+    UnsupportedXtalFrequency(String),
+
+    /// Failed to write eFuse
+    #[error("Failed to write eFuse: {0}")]
+    WritingEfuseFailed(String),
+
+    /// Timed out while waiting for eFuse controller to return to idle
+    #[error("Timed out while waiting for eFuse controller to return to idle")]
+    TimedOutWaitingForEfuseController,
+
+    /// Tried to use an unsupported eFuse coding scheme
+    #[error("Tried to use an unsupported eFuse coding scheme: {0}")]
+    UnsupportedEfuseCodingScheme(String),
 }
 
 #[cfg(feature = "serialport")]