原始版本

RT_Thread/libcpu/risc-v/common64/tick.c

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+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018/10/28     Bernard      The unify RISC-V porting code.
+ * 2024/07/08     Shell        Using CPUTIME as tick
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#include <drivers/cputime.h>
+#include <encoding.h>
+#include "sbi.h"
+
+#ifdef RT_USING_KTIME
+#include <ktime.h>
+#endif
+
+static volatile unsigned long tick_cycles = 0;
+
+int tick_isr(void)
+{
+    rt_tick_increase();
+    sbi_set_timer(clock_cpu_gettime() + tick_cycles);
+    return 0;
+}
+
+/* BSP should config clockbase frequency */
+RT_STATIC_ASSERT(defined_clockbase_freq, CPUTIME_TIMER_FREQ != 0);
+
+/* Sets and enable the timer interrupt */
+int rt_hw_tick_init(void)
+{
+    /* calculate the tick cycles */
+    tick_cycles = CPUTIME_TIMER_FREQ / RT_TICK_PER_SECOND;
+
+    /* Clear the Supervisor-Timer bit in SIE */
+    clear_csr(sie, SIP_STIP);
+
+    /* Init riscv timer */
+    riscv_cputime_init();
+
+    /* Set timer */
+    sbi_set_timer(clock_cpu_gettime() + tick_cycles);
+
+#ifdef RT_USING_KTIME
+    rt_ktime_cputimer_init();
+#endif
+    /* Enable the Supervisor-Timer bit in SIE */
+    set_csr(sie, SIP_STIP);
+
+    return 0;
+}
+
+/**
+ * This function will delay for some us.
+ *
+ * @param us the delay time of us
+ */
+void rt_hw_us_delay(rt_uint32_t us)
+{
+    unsigned long start_time;
+    unsigned long end_time;
+    unsigned long run_time;
+
+    start_time = clock_cpu_gettime();
+    end_time = start_time + us * (CPUTIME_TIMER_FREQ / 1000000);
+    do
+    {
+        run_time = clock_cpu_gettime();
+    } while(run_time < end_time);
+}