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middleware/udelay/udelay.h

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+/**
+ * @file udelay.h
+ * @brief udelay common api
+ *
+ * @copyright Copyright (c) 2022  Semidrive Semiconductor.
+ *            All rights reserved.
+ */
+
+#ifndef SDRV_UDELAY_H_
+#define SDRV_UDELAY_H_
+
+#include <types.h>
+
+/**
+ * @brief max udelay time, 5 seconds
+ *
+ */
+#define MAX_UDELAY  (5000000UL)
+
+/**
+ * @brief Initialize ARM Performance Monitor cycle counter
+ *
+ *  sdrv udelay is implement by arm pmu cycle counter, you must
+ *  call this function before use udelay().
+ *
+ *  note: this function must called after cpu clock has configurated.
+ */
+void sdrv_pmu_counter_init(void);
+
+
+/**
+ * @brief delay for microseconds
+ *
+ * @param us microseconds
+ */
+void udelay(uint32_t us);
+
+#endif /* SDRV_UDELAY_H_ */