add SPDX indentifier, modify 450zi.icf file and static definition in us_ticker.c

Author: ChazJin

features/netsocket/emac-drivers/TARGET_GD_EMAC/TARGET_GD32F4XX/gd32f4_eth_init.c

@@ -1,6 +1,8 @@
 /* mbed Microcontroller Library
  * Copyright (c) 2018 GigaDevice Semiconductor Inc.
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at

targets/TARGET_GigaDevice/TARGET_GD32F4XX/TARGET_GD32F450ZI/device/TOOLCHAIN_IAR/gd32f450zi.icf

@@ -17,7 +17,7 @@ define symbol __ICFEDIT_region_RAM_start__  = 0x200001B0;
 define symbol __ICFEDIT_region_RAM_end__    = 0x2002FFFF;
 
 /*-Sizes-*/
-define symbol __ICFEDIT_size_cstack__ = 0x3000;
+define symbol __ICFEDIT_size_cstack__ = 0x400;
 define symbol __ICFEDIT_size_heap__   = 0x10000;
 /**** End of ICF editor section. ###ICF###*/
 

targets/TARGET_GigaDevice/TARGET_GD32F4XX/us_ticker.c

@@ -21,16 +21,16 @@
 #include "hal_tick.h"
 
 #if TICKER_TIMER_WIDTH_BIT == 16
-uint32_t time_before;
-uint32_t total_elapsed_time;
+static uint32_t time_before;
+static uint32_t total_elapsed_time;
 #endif
 
 /* this variable is set to 1 at the end of mbed_sdk_init function.
 the ticker_read_us() function must not be called until the mbed_sdk_init is terminated */
 extern int mbed_sdk_inited;
-uint32_t ticker_timer_cnt;
-uint32_t ticker_timer_ch0cv;
-uint32_t ticker_timer_dmainten;
+static uint32_t ticker_timer_cnt;
+static uint32_t ticker_timer_ch0cv;
+static uint32_t ticker_timer_dmainten;
 
 void ticker_timer_init(void);
 #if TICKER_TIMER_WIDTH_BIT == 16