Refactoring

1 files changed, 126 insertions, 0 deletions

diff --git a/src/Interrupts.c b/src/Interrupts.c
new file mode 100644
index 0000000..ce407cf
--- /dev/null
+++ b/src/Interrupts.c
@@ -0,0 +1,126 @@
+/*******************************************************************//**
+*
+* \file     Interrupts.c
+*
+* \author   Xavier Del Campo
+*
+* \brief    Implementation of Interrupts module.
+*
+************************************************************************/
+
+/* *************************************
+ * Includes
+ * *************************************/
+
+#include "Interrupts.h"
+#include <psx.h>
+#include <stdint.h>
+#include <stddef.h>
+
+/* *************************************
+ * Defines
+ * *************************************/
+
+#ifndef I_MASK
+/*******************************************************************//**
+*
+* \brief    Interrupt mask register.
+*
+*           According to NoCash specifications, I_MASK bits are
+*           structured as follows:
+*
+*           \arg    Bit 0       IRQ0 VBLANK (PAL=50Hz, NTSC=60Hz)
+*           \arg    Bit 1       IRQ1 GPU
+*           \arg    Bit 2       IRQ2 CDROM
+*           \arg    Bit 3       IRQ3 DMA
+*           \arg    Bit 4       IRQ4 TMR0  Timer 0 aka Root Counter 0
+*           \arg    Bit 5       IRQ5 TMR1  Timer 1 aka Root Counter 1
+*           \arg    Bit 6       IRQ6 TMR2  Timer 2 aka Root Counter 2
+*           \arg    Bit 7       IRQ7 Controller and Memory Card
+*           \arg    Bit 8       IRQ8 SIO
+*           \arg    Bit 9       IRQ9 SPU
+*           \arg    Bit 10      IRQ10 Controller - Lightpen Interrupt
+*           \arg    Bits 11-15  Not used (always zero)
+*           \arg    Bits 16-31  Garbage
+*
+************************************************************************/
+#define I_MASK  (*(volatile unsigned int*)0x1F801074)
+#endif /* I_MASK */
+
+/* *************************************
+ * Types definition
+ * *************************************/
+
+/* *************************************
+ * Global variables definition
+ * *************************************/
+
+/* *************************************
+ * Local variables definition
+ * *************************************/
+
+/* *************************************
+ *  Local prototypes declaration
+ * *************************************/
+
+/* *************************************
+ * Functions definition
+ * *************************************/
+
+/*******************************************************************//**
+*
+* \brief    Enables an interrupt source given by intSource.
+*
+* \param    intSource
+*               HW interrupt source.
+*
+* \see      \ref InterruptSource for a list of possible HW interrupt causes.
+*
+************************************************************************/
+void InterruptsEnableInt(const enum InterruptSource intSource)
+{
+    if (intSource < MAX_INTERRUPT_SOURCES)
+    {
+        /* Disable interrupts while I_MASK is modified. */
+        EnterCriticalSection();
+
+        /* Set bit for selected interrupt source. */
+        I_MASK |= 1 << intSource;
+
+        /* Re-enable interrupts. */
+        ExitCriticalSection();
+    }
+    else
+    {
+        /* Invalid selected InterruptSource instance. Exit. */
+    }
+}
+
+/*******************************************************************//**
+*
+* \brief    Disables an interrupt source given by intSource.
+*
+* \param    intSource
+*               HW interrupt source.
+*
+* \see      \ref InterruptSource for a list of possible HW interrupt causes.
+*
+************************************************************************/
+void InterruptsDisableInt(const enum InterruptSource intSource)
+{
+    if (intSource < MAX_INTERRUPT_SOURCES)
+    {
+        /* Disable interrupts while I_MASK is modified. */
+        EnterCriticalSection();
+
+        /* Remove bit for selected interrupt source. */
+        I_MASK &= ~(1 << intSource);
+
+        /* Re-enable interrupts while I_MASK is modified. */
+        ExitCriticalSection();
+    }
+    else
+    {
+        /* Invalid selected InterruptSource instance. Exit. */
+    }
+}