Esp32c2 coex (esp-rs#347)

* Support COEX on ESP32-C2

* Fix script

* Remove WiFi scan from COEX example

Author: bjoernQ

esp-wifi/build.rs

@@ -17,7 +17,7 @@ fn main() -> Result<(), String> {
         "#
         );
     }
-    #[cfg(all(feature = "coex", any(feature = "esp32s2", feature = "esp32c2")))]
+    #[cfg(all(feature = "coex", any(feature = "esp32s2")))]
     {
         panic!(
             r#"

esp-wifi/examples/coex.rs

@@ -20,12 +20,12 @@ use esp_wifi::{
 
 use embedded_io::*;
 use embedded_svc::ipv4::Interface;
-use embedded_svc::wifi::{AccessPointInfo, ClientConfiguration, Configuration, Wifi};
+use embedded_svc::wifi::{ClientConfiguration, Configuration, Wifi};
 
 use esp_backtrace as _;
 use esp_println::{print, println};
 use esp_wifi::initialize;
-use esp_wifi::wifi::{utils::create_network_interface, WifiError};
+use esp_wifi::wifi::utils::create_network_interface;
 use hal::{clock::ClockControl, Rng};
 use hal::{peripherals::Peripherals, prelude::*};
 use smoltcp::{iface::SocketStorage, wire::IpAddress, wire::Ipv4Address};
@@ -59,7 +59,7 @@ fn main() -> ! {
     let wifi = peripherals.WIFI;
     let bluetooth = peripherals.BT;
 
-    let mut socket_set_entries: [SocketStorage; 3] = Default::default();
+    let mut socket_set_entries: [SocketStorage; 2] = Default::default();
     let (iface, device, mut controller, sockets) =
         create_network_interface(&init, wifi, WifiStaDevice, &mut socket_set_entries).unwrap();
     let wifi_stack = WifiStack::new(iface, device, sockets, current_millis);
@@ -74,15 +74,6 @@ fn main() -> ! {
 
     controller.start().unwrap();
     println!("is wifi started: {:?}", controller.is_started());
-
-    println!("Start Wifi Scan");
-    let res: Result<(heapless::Vec<AccessPointInfo, 10>, usize), WifiError> = controller.scan_n();
-    if let Ok((res, _count)) = res {
-        for ap in res {
-            println!("{:?}", ap);
-        }
-    }
-
     println!("{:?}", controller.get_capabilities());
     println!("wifi_connect {:?}", controller.connect());
 
@@ -138,8 +129,8 @@ fn main() -> ! {
 
     println!("Start busy loop on main");
 
-    let mut rx_buffer = [0u8; 1536];
-    let mut tx_buffer = [0u8; 1536];
+    let mut rx_buffer = [0u8; 128];
+    let mut tx_buffer = [0u8; 128];
     let mut socket = wifi_stack.get_socket(&mut rx_buffer, &mut tx_buffer);
 
     loop {
@@ -157,7 +148,7 @@ fn main() -> ! {
 
         let wait_end = current_millis() + 20 * 1000;
         loop {
-            let mut buffer = [0u8; 512];
+            let mut buffer = [0u8; 128];
             if let Ok(len) = socket.read(&mut buffer) {
                 let to_print = unsafe { core::str::from_utf8_unchecked(&buffer[..len]) };
                 print!("{}", to_print);

esp-wifi/src/ble/mod.rs

@@ -25,6 +25,7 @@ pub(crate) unsafe extern "C" fn malloc(size: u32) -> *mut crate::binary::c_types
     crate::compat::malloc::malloc(size as usize).cast()
 }
 
+#[cfg(any(esp32, esp32c3, esp32s3))]
 pub(crate) unsafe extern "C" fn malloc_internal(size: u32) -> *mut crate::binary::c_types::c_void {
     crate::compat::malloc::malloc(size as usize).cast()
 }

esp-wifi/src/wifi/mod.rs

@@ -310,7 +310,7 @@ pub enum InternalWifiError {
     EspErrWifiTxDisallow = 0x3016,
 }
 
-#[cfg(all(coex, any(esp32, esp32c3, esp32c6, esp32s3)))]
+#[cfg(all(coex, any(esp32, esp32c2, esp32c3, esp32c6, esp32s3)))]
 static mut G_COEX_ADAPTER_FUNCS: coex_adapter_funcs_t = coex_adapter_funcs_t {
     _version: include::COEX_ADAPTER_VERSION as i32,
     _task_yield_from_isr: Some(task_yield_from_isr),
@@ -339,6 +339,9 @@ static mut G_COEX_ADAPTER_FUNCS: coex_adapter_funcs_t = coex_adapter_funcs_t {
     _int_disable: Some(wifi_int_disable),
     #[cfg(esp32)]
     _int_enable: Some(wifi_int_restore),
+
+    #[cfg(esp32c2)]
+    _slowclk_cal_get: Some(slowclk_cal_get),
 };
 
 #[cfg(coex)]