RT-Thread_v4.1.1

libcpu/arm/lpc24xx/interrupt.c

@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-12-11     XuXinming    first version
+ * 2013-03-29     aozima       Modify the interrupt interface implementations.
+ */
+
+#include <rtthread.h>
+#include <rthw.h>
+#include "LPC24xx.h"
+
+#define MAX_HANDLERS    32
+
+/* exception and interrupt handler table */
+struct rt_irq_desc irq_desc[MAX_HANDLERS];
+
+extern rt_uint32_t rt_interrupt_nest;
+
+/* exception and interrupt handler table */
+rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
+rt_uint32_t rt_thread_switch_interrupt_flag;
+
+/**
+ * @addtogroup LPC2478
+ */
+/*@{*/
+void rt_hw_interrupt_handler(int vector, void *param)
+{
+    rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
+}
+
+void rt_hw_interrupt_init(void)
+{
+    register int i;
+
+    rt_uint32_t *vect_addr, *vect_cntl;
+
+    /* initialize VIC*/
+    VICIntEnClr = 0xffffffff;
+    VICVectAddr = 0;
+    VICIntSelect = 0;
+
+    /* init exceptions table */
+    rt_memset(irq_desc, 0x00, sizeof(irq_desc));
+    for(i=0; i < MAX_HANDLERS; i++)
+    {
+        irq_desc[i].handler = rt_hw_interrupt_handler;
+
+        vect_addr  = (rt_uint32_t *)(VIC_BASE_ADDR + 0x100 + i*4);
+        vect_cntl  = (rt_uint32_t *)(VIC_BASE_ADDR + 0x200 + i*4);
+        *vect_addr = (rt_uint32_t)&irq_desc[i];
+        *vect_cntl = 0xF;
+    }
+
+    /* 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;
+}
+
+void rt_hw_interrupt_mask(int vector)
+{
+    VICIntEnClr = (1 << vector);
+}
+
+void rt_hw_interrupt_umask(int vector)
+{
+    VICIntEnable = (1 << vector);
+}
+
+/**
+ * This function will install a interrupt service routine to a interrupt.
+ * @param vector the interrupt number
+ * @param handler the interrupt service routine to be installed
+ * @param param the parameter for interrupt service routine
+ * @name unused.
+ *
+ * @return the old handler
+ */
+rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
+                                    void *param, const char *name)
+{
+    rt_isr_handler_t old_handler = RT_NULL;
+
+    if(vector >= 0 && vector < MAX_HANDLERS)
+    {
+        old_handler = irq_desc[vector].handler;
+        if (handler != RT_NULL)
+        {
+            irq_desc[vector].handler = handler;
+            irq_desc[vector].param = param;
+        }
+    }
+
+    return old_handler;
+}
+
+/*@}*/