From 72f5882239bb88b8a68f305802e0dde37a975604 Mon Sep 17 00:00:00 2001
From: Leo C
Date: Wed, 13 Aug 2014 21:00:21 +0200
Subject: Add memory commands (cmp, cp, md, mm, mw, nm)

Add kind of scheduler for background tasks
---
 avr/z80-if.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'avr/z80-if.c')

diff --git a/avr/z80-if.c b/avr/z80-if.c
index 207aed1..9ee9cb0 100644
--- a/avr/z80-if.c
+++ b/avr/z80-if.c
@@ -2,7 +2,7 @@
  *
  * Pin assignments
  *
- * | Z180-Sig 	|   AVR-Port	| Dir	|   Special Function	|
+ * | Z180-Sig	|   AVR-Port	| Dir	|   Special Function	|
  * +------------+---------------+-------+-----------------------+
  * |	A0	| PA 	0	|  O	|			|
  * |	A1	| PA 	1	|  O	|			|
@@ -137,14 +137,20 @@ struct bits {
 //#define Z80_I_HALT	SBIT(P_HALT, )
 
 
+#if 0
 void z80_busreq(level_t level)
 {
 	Z80_O_BUSREQ = level;
 }
+#endif
 
 void z80_reset(level_t level)
 {
 	Z80_O_RST = level;
+	if (level)
+		Stat |= S_Z180_RUNNING;
+	else
+		Stat &= ~S_Z180_RUNNING;
 }
 
 
@@ -153,6 +159,7 @@ void z80_reset_pulse(void)
 	Z80_O_RST = 0;
 	_delay_us(10);
 	Z80_O_RST = 1;
+	Stat |= S_Z180_RUNNING;
 }
 
 #if 0
@@ -241,6 +248,8 @@ void z80_setup_bus(void)
 
 	z80_setup_addrbus_tristate();
 	z80_setup_dbus_in();
+
+	Stat &= ~S_Z180_RUNNING;
 }
 
 /*--------------------------------------------------------------------------*/
@@ -248,6 +257,10 @@ void z80_setup_bus(void)
 void z80_request_bus(void)
 {
 	Z80_O_BUSREQ = 0;
+
+	if (!(Stat & S_Z180_RUNNING))
+		Z80_O_RST = 1;
+
 	while(Z80_I_BUSACK == 1);
 	z80_setup_addrbus_active();
 }
@@ -256,6 +269,10 @@ void z80_release_bus(void)
 {
 	z80_setup_dbus_in();
 	z80_setup_addrbus_tristate();
+
+	if (!(Stat & S_Z180_RUNNING))
+		Z80_O_RST = 0;
+
 	Z80_O_BUSREQ = 1;
 	//while(Z80_I_BUSACK == 0);
 }
@@ -456,6 +473,9 @@ void z80_memfifo_putc(fifo_t f, uint8_t val)
 }
 
 /*--------------------------------------------------------------------------*/
+/*
+	TODO: Rewrite msg_fifo routines for AVR
+*/
 
 static struct {
 	uint32_t base;
-- 
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