X-Git-Url: http://cloudbase.mooo.com/gitweb/z180-stamp.git/blobdiff_plain/61bd408cda6cc14d11bd9815828df2e8dec39bec..b35fcb2f65a9c2dd17faae5b513eecca8032461b:/avr/z80-if.c

diff --git a/avr/z80-if.c b/avr/z80-if.c
index e36b369..6183849 100644
--- a/avr/z80-if.c
+++ b/avr/z80-if.c
@@ -136,6 +136,11 @@
 #define MASK(n)	((1<<(n))-1)
 #define SMASK(w,s) (MASK(w) << (s))
 
+void z80_bus_request_or_exit(void)
+{
+	if (!(z80_bus_cmd(Request) & ZST_ACQUIRED))
+		cmd_error(CMD_RET_FAILURE, EBUSTO, NULL);
+}
 
 static zstate_t zstate;
 static volatile uint8_t timer;		/* used for bus timeout */