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Example/EpaperModuleTest_AT32F403A/Src/delay.c

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+#include "delay.h"
+
+/* delay macros */
+#define STEP_DELAY_MS                    50
+
+/* delay variable */
+static __IO uint32_t fac_us;
+static __IO uint32_t fac_ms;
+
+/**
+  * @brief  initialize delay function
+  * @param  none
+  * @retval none
+  */
+void delay_init(void)
+{
+  /* configure systick */
+  systick_clock_source_config(SYSTICK_CLOCK_SOURCE_AHBCLK_NODIV);
+  fac_us = system_core_clock / (1000000U);
+  fac_ms = fac_us * (1000U);
+}
+
+/**
+  * @brief  inserts a delay time.
+  * @param  nus: specifies the delay time length, in microsecond.
+  * @retval none
+  */
+void delay_us(uint32_t nus)
+{
+  uint32_t temp = 0;
+  SysTick->LOAD = (uint32_t)(nus * fac_us);
+  SysTick->VAL = 0x00;
+  SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk ;
+  do
+  {
+    temp = SysTick->CTRL;
+  }while((temp & 0x01) && !(temp & (1 << 16)));
+
+  SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
+  SysTick->VAL = 0x00;
+}
+
+/**
+  * @brief  inserts a delay time.
+  * @param  nms: specifies the delay time length, in milliseconds.
+  * @retval none
+  */
+void delay_ms(uint16_t nms)
+{
+  uint32_t temp = 0;
+  while(nms)
+  {
+    if(nms > STEP_DELAY_MS)
+    {
+      SysTick->LOAD = (uint32_t)(STEP_DELAY_MS * fac_ms);
+      nms -= STEP_DELAY_MS;
+    }
+    else
+    {
+      SysTick->LOAD = (uint32_t)(nms * fac_ms);
+      nms = 0;
+    }
+    SysTick->VAL = 0x00;
+    SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
+    do
+    {
+      temp = SysTick->CTRL;
+    }while((temp & 0x01) && !(temp & (1 << 16)));
+
+    SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
+    SysTick->VAL = 0x00;
+  }
+}
+
+/**
+  * @brief  inserts a delay time.
+  * @param  sec: specifies the delay time, in seconds.
+  * @retval none
+  */
+void delay_sec(uint16_t sec)
+{
+  uint16_t index;
+  for(index = 0; index < sec; index++)
+  {
+    delay_ms(500);
+    delay_ms(500);
+  }
+}