add sys_tick.c

src/platforms/raw/sys_tick.c

@@ -0,0 +1,50 @@
+/**
+ * File:   sys_tick.c
+ * Author: AWTK Develop Team
+ * Brief:  use sys tick to implement sleep/get_time_ms.
+ *
+ * Copyright (c) 2018 - 2018  Guangzhou ZHIYUAN Electronics Co.,Ltd.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * License file for more details.
+ *
+ */
+
+/**
+ * History:
+ * ================================================================
+ * 2018-06-03 Li XianJing <xianjimli@hotmail.com> created
+ *
+ */
+
+#include "base/types_def.h"
+
+static uint32_t g_sys_tick;
+
+void SysTick_Handler(void) {
+  g_sys_tick++;
+}
+
+uint32_t get_time_ms() {
+  return g_sys_tick;
+}
+
+void sleep_ms(uint32_t ms) {
+  uint32_t count = 0;
+  uint32_t start = get_time_ms();
+
+  while (get_time_ms() < (start + ms)) {
+    count++;
+  }
+}
+
+void delay_ms(uint32_t ms) {
+  sleep_ms(ms);
+}
+
+void delay_us(uint32_t us) {
+  sleep_ms(1);
+}
+