From 916c8dd1dfa2414ae8b58ab1e3d477b24c553815 Mon Sep 17 00:00:00 2001
From: hackbard <hackbard@staubsauger.localdomain>
Date: Tue, 18 Sep 2007 02:09:02 +0200
Subject: [PATCH] prepare for interrupt support in the next few days

---
 betty/betty.c      |  7 +++++++
 betty/interrupts.c | 11 +++++++----
 betty/interrupts.h | 28 +++++++++++++++++++++++++++-
 betty/startup.s    | 10 ++++++++--
 betty/system.c     |  7 +++++--
 betty/system.h     |  7 +++++++
 6 files changed, 61 insertions(+), 9 deletions(-)

diff --git a/betty/betty.c b/betty/betty.c
index 093232b..d10456e 100644
--- a/betty/betty.c
+++ b/betty/betty.c
@@ -41,6 +41,7 @@ const char d2_txt[]="- alphablend -";
 
 int main() {
 
+	/* variables */
 	t_button button;
 	u8 contrast;
 
@@ -48,6 +49,12 @@ int main() {
 	pll_init();
 	pin_init();
 	ext_mem_init();
+
+	/* memory mapping - dirty! */
+	if((void *)announce<(void *)FLASH_BANK0)
+		mmap_init(MEMTYPE_RAM);
+	else
+		mmap_init(MEMTYPE_EXT);
 	
 	/* uart init */
 	uart0_init();
diff --git a/betty/interrupts.c b/betty/interrupts.c
index fa1fcc1..61cf1af 100644
--- a/betty/interrupts.c
+++ b/betty/interrupts.c
@@ -11,6 +11,13 @@
  * functions
  */
 
+void interrupt_set_default_callback(t_interrupt *ir,void *callback) {
+
+	ir->default_callback=callback;
+}
+
+
+
 /*
  * the actual exception handlers (as defined in startup.s)
  */
@@ -35,10 +42,6 @@ void interrupt_handler_prefetch_abort(void) {
 void interrupt_handler_data_abort(void) {
 }
 
-// irq
-void interrupt_handler_irq(void) {
-}
-
 // fiq
 void interrupt_handler_fiq(void) {
 }
diff --git a/betty/interrupts.h b/betty/interrupts.h
index 9c1b8aa..20bb333 100644
--- a/betty/interrupts.h
+++ b/betty/interrupts.h
@@ -5,16 +5,42 @@
  *
  */
 
+#ifndef INTERRUPTS_H
+#define INTERRUPTS_H
+
 #include "lpc2xxx.h"
 #include "types.h"
 
+/* defines */
+
+#define INTERRUPT_MAX_VIC		16
+
+#define INTERRUPT_EXT_MODE_EDGE		0
+#define INTERRUPT_EXT_MODE_LEVEL	1
+#define INTERRUPT_EXT_POLAR_LOW		0
+#define INTERRUPT_EXT_POLAR_HIGH	1
+
+/* type definitions */
+
+typedef struct s_interrupt {
+	void *default_callback;
+	u8 default_mode;
+	void *callback[INTERRUPT_MAX_VIC];
+	u8 mode[INTERRUPT_MAX_VIC];
+} t_interrupt;
+
 /* function prototypes */
 
+void interrupt_set_default_callback(t_interrupt *ir,void *callback);
+
+void interrupt_ext_ir_conf(u8 pin,u8 mode,u8 polar,
+                           void (*ext_ir_callback)(t_interrupt *ir));
+
 void interrupt_handler_reset(void);
 void interrupt_handler_undef_instruction(void);
 void interrupt_handler_soft_ir(void);
 void interrupt_handler_prefetch_abort(void);
 void interrupt_handler_data_abort(void);
-void interrupt_handler_irq(void);
 void interrupt_handler_fiq(void);
 
+#endif
diff --git a/betty/startup.s b/betty/startup.s
index fb42ac7..d393d32 100644
--- a/betty/startup.s
+++ b/betty/startup.s
@@ -49,6 +49,13 @@
 .arm
 
 	# exception handling must go to the very beginning
+	#
+	# concerning irq:
+	#  - the ldr is at 0x18
+	#  - pc will be 0x18 + 8 at the moment of ldr (pipeline)
+	#  - substract 0xff0 => 0xfffff030
+	#  - that's the vectored address register
+	#  - the vic put in there the address of our service routine
 
 	ldr pc, handler_reset
 	ldr pc, handler_undef_instruction
@@ -56,7 +63,7 @@
 	ldr pc, handler_prefetch_abort
 	ldr pc, handler_data_abort
 	nop
-	ldr pc, handler_irq
+	ldr pc, [pc, #-0xff0]
 	ldr pc, handler_fiq
 
 handler_reset: .word handle_reset
@@ -64,7 +71,6 @@ handler_undef_instruction: .word interrupt_handler_undef_instruction
 handler_soft_ir: .word interrupt_handler_soft_ir
 handler_prefetch_abort: .word interrupt_handler_prefetch_abort
 handler_data_abort: .word interrupt_handler_data_abort
-handler_irq: .word interrupt_handler_irq
 handler_fiq: .word interrupt_handler_fiq
 
 	# reset handling goes here
diff --git a/betty/system.c b/betty/system.c
index 4204cdd..ef18b57 100644
--- a/betty/system.c
+++ b/betty/system.c
@@ -72,11 +72,11 @@ void pin_init(void) {
 	/*
 	 * pinsel 1
 	 *
-	 * no special function yet!
+	 * p0.30: eint3
 	 *
 	 */
 
-	PINSEL1=0x00000000;
+	PINSEL1=0x20000000;
 
 	/*
 	 * pin select 2
@@ -116,6 +116,9 @@ void pin_init(void) {
 
 void mmap_init(u8 memtype) {
 
+	if(memtype==MEMTYPE_RESERVED)
+		return;
+
 	MEMMAP=memtype;
 }
 
diff --git a/betty/system.h b/betty/system.h
index 9031725..5fe98d9 100644
--- a/betty/system.h
+++ b/betty/system.h
@@ -11,6 +11,13 @@
 #include "lpc2xxx.h"
 #include "types.h"
 
+/* defines */
+
+#define MEMTYPE_BOOT		0x00
+#define MEMTYPE_RESERVED	0x01
+#define MEMTYPE_RAM		0x02
+#define MEMTYPE_EXT		0x03
+
 /* function prototypes */
 void pll_init(void);
 void ext_mem_init(void);
-- 
2.20.1