fix(esp_vfs_console): Update placement of cdcacm_xx_cb when ETS print enabled

components/esp_vfs_console/test_apps/usb_cdc_vfs/CMakeLists.txt

@@ -7,3 +7,17 @@ set(COMPONENTS main)
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(usb_cdc_vfs_test)
+
+idf_build_get_property(elf EXECUTABLE)
+if(CONFIG_COMPILER_DUMP_RTL_FILES)
+    add_custom_target(check_test_app_sections ALL
+                        COMMAND ${PYTHON} $ENV{IDF_PATH}/tools/ci/check_callgraph.py
+                        --rtl-dirs ${CMAKE_BINARY_DIR}/esp-idf/driver/,${CMAKE_BINARY_DIR}/esp-idf/hal/
+                        --elf-file ${CMAKE_BINARY_DIR}/*.elf
+                        find-refs
+                        --from-sections=.iram0.text
+                        --to-sections=.flash.text,.flash.rodata
+                        --exit-code
+                        DEPENDS ${elf}
+                        )
+endif()

components/esp_vfs_console/test_apps/usb_cdc_vfs/main/test_app_main.c

@@ -8,8 +8,10 @@
 #include <fcntl.h>
 #include <sys/errno.h>
 #include "unity.h"
+#include "unity_test_utils_cache.h"
 #include "esp_private/usb_console.h"
 #include "esp_vfs_cdcacm.h"
+#include "esp_rom_sys.h"
 
 static void flush_write(void)
 {
@@ -263,6 +265,39 @@ static void test_usb_cdc_read_no_exit_on_newline_reception(void)
     vTaskDelay(2);  // wait for tasks to exit
 }
 
+static void IRAM_ATTR test_input_output_post_cache_disable(void *args)
+{
+    static DRAM_ATTR const char test_msg[] = "test_message\n";
+    esp_rom_printf(test_msg);
+}
+
+/**
+ * @brief Test that the tx and rx cb are placed in IRAM correctly
+ */
+static void test_usb_cdc_ets_printf_cache_disabled(void)
+{
+    test_setup(__func__, sizeof(__func__));
+
+    /* make sure blocking mode is enabled */
+    int flags = fcntl(STDIN_FILENO, F_GETFL, 0);
+    fcntl(STDIN_FILENO, F_SETFL, flags & (~O_NONBLOCK));
+
+#if CONFIG_ESP_CONSOLE_USB_CDC_SUPPORT_ETS_PRINTF
+    unity_utils_run_cache_disable_stub(test_input_output_post_cache_disable, NULL);
+#else
+#error This test must run with CONFIG_ESP_CONSOLE_USB_CDC_SUPPORT_ETS_PRINTF enabled
+#endif
+
+    // send message to the test environment to report successful test
+    char ready_msg[] = "successful test\n";
+    write(fileno(stdout), ready_msg, sizeof(ready_msg));
+
+    fcntl(STDIN_FILENO, F_SETFL, flags);
+    esp_vfs_dev_cdcacm_set_rx_line_endings(ESP_LINE_ENDINGS_CRLF);
+    esp_vfs_dev_cdcacm_set_tx_line_endings(ESP_LINE_ENDINGS_CRLF);
+    vTaskDelay(2);  // wait for tasks to exit
+}
+
 /* Always make sure that the function calling sequence in the main
  * function matches the expected order in the pytest function.
  */
@@ -272,4 +307,5 @@ void app_main(void)
     test_usb_cdc_read_non_blocking();
     test_usb_cdc_read_blocking();
     test_usb_cdc_read_no_exit_on_newline_reception();
+    test_usb_cdc_ets_printf_cache_disabled();
 }

components/esp_vfs_console/test_apps/usb_cdc_vfs/pytest_usb_cdc_vfs.py

@@ -37,3 +37,8 @@ def test_usb_cdc_vfs_default(dut: Dut) -> None:
     dut.expect_exact('test_usb_cdc_read_no_exit_on_newline_reception', timeout=2)
     dut.expect_exact('ready to receive', timeout=2)
     dut.write('!(@*#&(!*@&#((SDasdkjhad\nce')
+
+    # test run: test_usb_cdc_ets_printf_cache_disabled
+    dut.expect_exact('test_usb_cdc_ets_printf_cache_disabled', timeout=2)
+    dut.expect_exact('test_message', timeout=2)
+    dut.expect_exact('successful test', timeout=2)

components/esp_vfs_console/test_apps/usb_cdc_vfs/sdkconfig.defaults

@@ -1,8 +1,12 @@
 # Enable Unity fixture support
 CONFIG_UNITY_ENABLE_FIXTURE=n
 CONFIG_UNITY_ENABLE_IDF_TEST_RUNNER=y
+CONFIG_COMPILER_DUMP_RTL_FILES=y
 
 # Custom partition table for this test app
 CONFIG_ESP_TASK_WDT_INIT=n
 
 CONFIG_ESP_CONSOLE_USB_CDC=y
+
+# one test requires this option to be enabled
+CONFIG_ESP_CONSOLE_USB_CDC_SUPPORT_ETS_PRINTF=y