import

2026-05-19 11:49:22 +08:00
commit add7af4222
96 changed files with 8635 additions and 0 deletions
@@ -0,0 +1,63 @@
+#include <dwt_delay.h>
+
+extern uint32_t SystemCoreClock;
+
+
+//定义需使能位
+#define    DEM_CR_TRCENA    (1u<<24)
+#define    DWT_CR_CYCCNTENA (1u<<0)
+
+
+//DWT init
+void DWT_Init(void)
+{
+    DEM_CR |= (uint32_t)DEM_CR_TRCENA;
+    DWT_CYCCNT = (uint32_t)0u;
+    DWT_CR |= (uint32_t)DWT_CR_CYCCNTENA;
+}
+
+void DWT_DelayUs(uint32_t us)
+{
+    uint32_t start = DWT_CYCCNT;
+    uint32_t cycles = us * (SystemCoreClock / 1000000);
+    uint32_t elapsed;
+
+    while (1) {
+        uint32_t current = DWT_CYCCNT;
+        if (current >= start) {
+            elapsed = current - start;
+        } else {
+            elapsed = (0xFFFFFFFFu - start) + current; // 处理溢出
+        }
+        if (elapsed >= cycles) break;
+    }
+}
+
+void DWT_DelayMs(uint32_t ms)
+{
+    for (uint32_t i = 0; i < ms; i++) {
+        DWT_DelayUs(1000);
+    }
+}
+
+//使用DWT测量函数运行时间
+float DTW_Time_DiffMs(volatile uint32_t start, volatile uint32_t stop)
+{
+    uint32_t diff;
+    if(stop > start)
+        diff = stop - start;
+    else
+        diff = stop + 0XFFFFFFFFu - start;
+    return (diff / (SystemCoreClock/1000));
+}
+
+float DTW_Time_DiffUs(volatile uint32_t start, volatile uint32_t stop)
+{
+    uint32_t diff;
+    if(stop > start)
+        diff = stop - start;
+    else
+        diff = stop + 0XFFFFFFFFu - start;
+    return (diff / (SystemCoreClock/1000000));
+}
+