RT-Thread_v4.1.1

libcpu/arm/AT91SAM7S/interrupt.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-08-23     Bernard      first version
+ */
+
+#include <rtthread.h>
+#include "AT91SAM7S.h"
+
+#define MAX_HANDLERS    32
+
+extern rt_uint32_t rt_interrupt_nest;
+
+rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
+rt_uint32_t rt_thread_switch_interrupt_flag;
+
+/**
+ * @addtogroup AT91SAM7
+ */
+/*@{*/
+
+void rt_hw_interrupt_handler(int vector)
+{
+    rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
+}
+
+/**
+ * This function will initialize hardware interrupt
+ */
+void rt_hw_interrupt_init()
+{
+    rt_base_t index;
+
+    for (index = 0; index < MAX_HANDLERS; index ++)
+    {
+        AT91C_AIC_SVR(index) = (rt_uint32_t)rt_hw_interrupt_handler;
+    }
+
+    /* init interrupt nest, and context in thread sp */
+    rt_interrupt_nest = 0;
+    rt_interrupt_from_thread = 0;
+    rt_interrupt_to_thread = 0;
+    rt_thread_switch_interrupt_flag = 0;
+}
+
+/**
+ * This function will mask a interrupt.
+ * @param vector the interrupt number
+ */
+void rt_hw_interrupt_mask(int vector)
+{
+    /* disable interrupt */
+    AT91C_AIC_IDCR = 1 << vector;
+
+    /* clear interrupt */
+    AT91C_AIC_ICCR = 1 << vector;
+}
+
+/**
+ * This function will un-mask a interrupt.
+ * @param vector the interrupt number
+ */
+void rt_hw_interrupt_umask(int vector)
+{
+    AT91C_AIC_IECR = 1 << vector;
+}
+
+/**
+ * This function will install a interrupt service routine to a interrupt.
+ * @param vector the interrupt number
+ * @param new_handler the interrupt service routine to be installed
+ * @param old_handler the old interrupt service routine
+ */
+void rt_hw_interrupt_install(int vector, rt_isr_handler_t new_handler, rt_isr_handler_t *old_handler)
+{
+    if(vector >= 0 && vector < MAX_HANDLERS)
+    {
+        if (*old_handler != RT_NULL) *old_handler = (rt_isr_handler_t)AT91C_AIC_SVR(vector);
+        if (new_handler != RT_NULL) AT91C_AIC_SVR(vector) = (rt_uint32_t)new_handler;
+    }
+}
+
+/*@}*/