Diff: TARGET_SAMR21G18A/TOOLCHAIN_GCC_ARM/systick_counter.h

Revision:

171:3a7713b1edbc

Parent:

111:4336505e4b1c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TARGET_SAMR21G18A/TOOLCHAIN_GCC_ARM/systick_counter.h	Thu Nov 08 11:45:42 2018 +0000
@@ -0,0 +1,68 @@
+#ifndef CYCLE_COUNTER_H_INCLUDED
+#define CYCLE_COUNTER_H_INCLUDED
+
+#include <compiler.h>
+#include <clock.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \name Convenience functions for busy-wait delay loops
+ *
+ * @{
+ */
+
+/**
+ * \brief Delay loop to delay n number of cycles
+ * Delay program execution for at least the specified number of CPU cycles.
+ *
+ * \param n  Number of cycles to delay
+ */
+static inline void delay_cycles(
+    const uint32_t n)
+{
+    if (n > 0) {
+        SysTick->LOAD = n;
+        SysTick->VAL = 0;
+
+        while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)) {
+        };
+    }
+}
+
+void delay_cycles_us(uint32_t n);
+
+void delay_cycles_ms(uint32_t n);
+
+/**
+ * \brief Delay program execution for at least the specified number of microseconds.
+ *
+ * \param delay  number of microseconds to wait
+ */
+#define cpu_delay_us(delay)      delay_cycles_us(delay)
+
+/**
+ * \brief Delay program execution for at least the specified number of milliseconds.
+ *
+ * \param delay  number of milliseconds to wait
+ */
+#define cpu_delay_ms(delay)      delay_cycles_ms(delay)
+
+/**
+ * \brief Delay program execution for at least the specified number of seconds.
+ *
+ * \param delay  number of seconds to wait
+ */
+#define cpu_delay_s(delay)       delay_cycles_ms(1000 * delay)
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CYCLE_COUNTER_H_INCLUDED */