Add support for the ESP32-C2 (aka ESP8684)

Cargo.toml

@@ -11,13 +11,14 @@ repository  = "https://github.com/esp-rs/esp-println"
 license     = "MIT OR Apache-2.0"
 
 [dependencies]
-log         = { version = "0.4.17", optional = true }
+log = { version = "0.4.17", optional = true }
 
 [features]
 default = ["uart"]
 
 # You must enable exactly 1 of the below features to support the correct chip:
 esp32   = []
+esp32c2 = []
 esp32c3 = []
 esp32s2 = []
 esp32s3 = []

build.rs

@@ -2,6 +2,7 @@ fn main() {
     // Ensure that only a single chip is specified
     let chip_features = [
         cfg!(feature = "esp32"),
+        cfg!(feature = "esp32c2"),
         cfg!(feature = "esp32c3"),
         cfg!(feature = "esp32s2"),
         cfg!(feature = "esp32s3"),
@@ -29,9 +30,7 @@ fn main() {
 
     // Ensure that, if the `jtag_serial` communication method feature is
     // enabled, either the `esp32c3` or `esp32s3` chip feature is enabled.
-    if cfg!(feature = "jtag_serial")
-        && (cfg!(feature = "esp32") || cfg!(feature = "esp32s2") || cfg!(feature = "esp8266"))
-    {
+    if cfg!(feature = "jtag_serial") && !(cfg!(feature = "esp32c3") || cfg!(feature = "esp32s3")) {
         panic!("The `jtag_serial` feature is only supported by the ESP32-C3 and ESP32-S3");
     }
 }

src/lib.rs

@@ -1,5 +1,4 @@
 #![no_std]
-#![allow(dead_code)]
 
 #[macro_export]
 macro_rules! println {
@@ -26,6 +25,8 @@ pub mod logger;
 
 #[cfg(feature = "esp32")]
 const UART_TX_ONE_CHAR: usize = 0x40009200;
+#[cfg(feature = "esp32c2")]
+const UART_TX_ONE_CHAR: usize = 0x40000058;
 #[cfg(feature = "esp32c3")]
 const UART_TX_ONE_CHAR: usize = 0x40000068;
 #[cfg(feature = "esp32s3")]