ASIO: fixed undefined ref to atomic functions and enabled examples for CI (esp32s2beta)

Implemented the atomic functions needed to compile and link the asio examples on esp32s2beta.

components/xtensa/stdatomic.c

@@ -34,6 +34,25 @@
     return ret; \
 }
 
+#define FETCH_ADD(n, type) type __atomic_fetch_add_ ## n (type* ptr, type value, int memorder) \
+{ \
+    unsigned state = portENTER_CRITICAL_NESTED(); \
+    type ret = *ptr; \
+    *ptr = *ptr + value; \
+    portEXIT_CRITICAL_NESTED(state); \
+    return ret; \
+}
+
+#define FETCH_SUB(n, type) type __atomic_fetch_sub_ ## n (type* ptr, type value, int memorder) \
+{ \
+    unsigned state = portENTER_CRITICAL_NESTED(); \
+    type ret = *ptr; \
+    *ptr = *ptr - value; \
+    portEXIT_CRITICAL_NESTED(state); \
+    return ret; \
+}
+
+
 //this piece of code should only be compiled if the cpu doesn't support atomic compare and swap (s32c1i)
 #if XCHAL_HAVE_S32C1I == 0
 
@@ -44,4 +63,14 @@ CMP_EXCHANGE(2, uint16_t)
 CMP_EXCHANGE(4, uint32_t)
 CMP_EXCHANGE(8, uint64_t)
 
+FETCH_ADD(1, uint8_t)
+FETCH_ADD(2, uint16_t)
+FETCH_ADD(4, uint32_t)
+FETCH_ADD(8, uint64_t)
+
+FETCH_SUB(1, uint8_t)
+FETCH_SUB(2, uint16_t)
+FETCH_SUB(4, uint32_t)
+FETCH_SUB(8, uint64_t)
+
 #endif

examples/protocols/asio/chat_client/CMakeLists.txt

@@ -6,6 +6,5 @@ cmake_minimum_required(VERSION 3.5)
 # This example uses an extra component for common functions such as Wi-Fi and Ethernet connection.
 set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common)
 
-set(SUPPORTED_TARGETS esp32)
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(asio_chat_client)

examples/protocols/asio/chat_server/CMakeLists.txt

@@ -6,6 +6,5 @@ cmake_minimum_required(VERSION 3.5)
 # This example uses an extra component for common functions such as Wi-Fi and Ethernet connection.
 set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common)
 
-set(SUPPORTED_TARGETS esp32)
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(asio_chat_server)

examples/protocols/asio/tcp_echo_server/CMakeLists.txt

@@ -6,6 +6,5 @@ cmake_minimum_required(VERSION 3.5)
 # This example uses an extra component for common functions such as Wi-Fi and Ethernet connection.
 set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common)
 
-set(SUPPORTED_TARGETS esp32)
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(asio_tcp_echo_server)

examples/protocols/asio/udp_echo_server/CMakeLists.txt

@@ -6,6 +6,5 @@ cmake_minimum_required(VERSION 3.5)
 # This example uses an extra component for common functions such as Wi-Fi and Ethernet connection.
 set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common)
 
-set(SUPPORTED_TARGETS esp32)
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(asio_udp_echo_server)