ready to alpha

подготовка к альфа-тестированию

cores/arduino/wiring_time.c

@@ -0,0 +1,93 @@
+/*
+  Copyright (c) 2011 Arduino.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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 GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "Arduino.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mik32_hal_scr1_timer.h"
+
+uint32_t start_del, current_del;
+
+// system timer initialization
+SCR1_TIMER_HandleTypeDef hscr1_timer;
+
+#define TICKS_IN_SYSTIMER   ((uint64_t)(hscr1_timer.Instance->MTIMEH)<<32 | hscr1_timer.Instance->MTIME)
+
+void SysTick_Init(void)
+{
+    hscr1_timer.Instance = SCR1_TIMER;
+    hscr1_timer.ClockSource = SCR1_TIMER_CLKSRC_INTERNAL; 
+    hscr1_timer.Divider = 0;
+    HAL_SCR1_Timer_Init(&hscr1_timer); // Ticks are 32 MHz
+}
+
+// number of microseconds since start of the program
+uint32_t micros(void)
+{
+  // cast to uint32_t and assume that when HAL_SCR1_Timer_Get_Ticks() returns a number 
+  // greater than 2^32/32, the variable will overflow itself
+  return (uint32_t)(TICKS_IN_SYSTIMER >> 5);
+}
+
+// there may be a problem with the timer counter overflow, because by the time it 
+// overflows the number of milliseconds will not have time to reach the maximum, 
+// and when it overflows it will be reseted to 0 ahead of time - the delay will be 
+// incorrect. But 64 bits will take a very long time to fill, so we'll leave it like that
+volatile uint32_t millis(void)
+{
+  return (uint32_t) (TICKS_IN_SYSTIMER / (uint64_t)(32000));
+}
+
+void delay(uint32_t ms)
+{
+  if (ms > 0) 
+  {
+    start_del = millis();
+    while (1)
+    {
+      current_del = millis();
+      // Let's check if there was an overflow. 
+      if (((current_del > start_del) ? (current_del - start_del) : (current_del + ~start_del + 1)) >= ms)
+        // exit if we got the required amount
+        break;
+    }
+  }
+}
+
+void delayMicroseconds(uint16_t us)
+{
+  if (us > 0) 
+  {
+    start_del = micros();
+    while (1)
+    {
+      current_del = micros();
+      // Let's check if there was an overflow. 
+      if (((current_del > start_del) ? (current_del - start_del) : (current_del + ~start_del + 1)) >= us)
+        // exit if we got the required amount
+        break;
+    }
+  }
+}
+
+#ifdef __cplusplus
+}
+#endif