[修改] 增加freeRTOS

1. 版本FreeRTOSv202212.01，命名为kernel；

kernel/FreeRTOS/Demo/AVR_Dx_IAR/main.c

@@ -0,0 +1,94 @@
+/*
+(C) 2020 Microchip Technology Inc. and its subsidiaries.
+
+Subject to your compliance with these terms, you may use Microchip software and
+any derivatives exclusively with Microchip products. It is your responsibility
+to comply with third party license terms applicable to your use of third party
+software (including open source software) that may accompany Microchip software.
+
+THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS".  NO WARRANTIES, WHETHER EXPRESS,
+IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED WARRANTIES
+OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
+IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
+INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER
+RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF
+THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT ALLOWED
+BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY RELATED TO THIS
+SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY
+TO MICROCHIP FOR THIS SOFTWARE.
+*/
+
+#include <ioavr.h>
+#include "FreeRTOS.h"
+#include "clk_config.h"
+
+#define mainSELECTED_APPLICATION    0
+
+/* Configure the hardware as necessary to run this demo. */
+static void prvSetupHardware( void );
+
+#if ( mainSELECTED_APPLICATION == 0 )
+extern void main_blinky( void );
+extern void init_blinky( void );
+#elif ( mainSELECTED_APPLICATION == 1 )
+extern void main_minimal( void );
+extern void init_minimal( void );
+#elif ( mainSELECTED_APPLICATION == 2 )
+extern void main_full( void );
+extern void init_full( void );
+#else
+#error Invalid mainSELECTED_APPLICATION setting. See the comments at the top of this file and above the mainSELECTED_APPLICATION definition.
+#endif
+
+int main( void )
+{
+    prvSetupHardware();
+
+#if ( mainSELECTED_APPLICATION == 0 )
+    main_blinky();
+#elif ( mainSELECTED_APPLICATION == 1 )
+    main_minimal();
+#elif ( mainSELECTED_APPLICATION == 2 )
+    main_full();
+#endif
+
+    return 0;
+}
+
+static void prvSetupHardware( void )
+{
+    /* Ensure no interrupts execute while the scheduler is in an inconsistent
+    state.  Interrupts are automatically enabled when the scheduler is
+    started. */
+    portDISABLE_INTERRUPTS();
+
+    CLK_init();
+
+#if ( mainSELECTED_APPLICATION == 0 )
+    init_blinky();
+#elif ( mainSELECTED_APPLICATION == 1 )
+    init_minimal();
+#elif ( mainSELECTED_APPLICATION == 2 )
+    init_full();
+#endif
+}
+
+/* vApplicationStackOverflowHook is called when a stack overflow occurs.
+This is usefull in application development, for debugging.  To use this
+hook, uncomment it, and set configCHECK_FOR_STACK_OVERFLOW to 1 in
+"FreeRTOSConfig.h" header file. */
+
+// void vApplicationStackOverflowHook(TaskHandle_t *pxTask, char *pcTaskName )
+// {
+//     for( ;; );
+// }
+
+/* vApplicationMallocFailedHook is called when memorry allocation fails.
+This is usefull in application development, for debugging.  To use this
+hook, uncomment it, and set configUSE_MALLOC_FAILED_HOOK to 1 in
+"FreeRTOSConfig.h" header file. */
+
+// void vApplicationMallocFailedHook( void )
+// {
+//     for( ;; );
+// }