From: Sebastian <basti@notizbuch>
Date: Fri, 8 Nov 2013 21:10:03 +0000 (+0100)
Subject: z80: uart echo test program (SDCC)
X-Git-Url: http://sraa.de/git/?p=z80.git;a=commitdiff_plain;h=f7ac2e0ac702f8b0922cdb2d4f9aae16695ae699

z80: uart echo test program (SDCC)
---

f7ac2e0ac702f8b0922cdb2d4f9aae16695ae699
diff --git a/z80/uart/Makefile b/z80/uart/Makefile
new file mode 100644
index 0000000..bdfe168
--- /dev/null
+++ b/z80/uart/Makefile
@@ -0,0 +1,27 @@
+# makefile
+
+OBJS	= crt0.rel main.rel
+
+CC	= sdcc -mz80
+AS	= sdasz80
+CFLAGS	= --all-callee-saves --no-std-crt0
+
+all: main.hex
+
+main.hex: $(OBJS)
+	@echo -e "\tLD\t$@"
+	@$(CC) $(CFLAGS) -o $@ $(OBJS)
+
+%.rel: %.c
+	@echo -e "\tCC\t$@"
+	@$(CC) $(CFLAGS) -c -o $@ $^
+
+%.rel: %.s
+	@echo -e "\tAS\t$@"
+	@$(AS) -o $@ $^
+
+clean:
+	@echo -e "\tCLEAN"
+	rm -f *.asm *.hex *.lk *.lst *.map *.noi *.rel *.sym
+
+.PHONY:	clean
diff --git a/z80/uart/crt0.s b/z80/uart/crt0.s
new file mode 100644
index 0000000..59ea466
--- /dev/null
+++ b/z80/uart/crt0.s
@@ -0,0 +1,91 @@
+;--------------------------------------------------------------------------
+;  crt0.s - Generic crt0.s for a Z80
+;
+;  Copyright (C) 2000, Michael Hope
+;
+;  This library is free software; you can redistribute it and/or modify it
+;  under the terms of the GNU General Public License as published by the
+;  Free Software Foundation; either version 2.1, or (at your option) any
+;  later version.
+;
+;  This library is distributed in the hope that it will be useful,
+;  but WITHOUT ANY WARRANTY; without even the implied warranty of
+;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;  GNU General Public License for more details.
+;
+;  You should have received a copy of the GNU General Public License 
+;  along with this library; see the file COPYING. If not, write to the
+;  Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+;   MA 02110-1301, USA.
+;
+;  As a special exception, if you link this library with other files,
+;  some of which are compiled with SDCC, to produce an executable,
+;  this library does not by itself cause the resulting executable to
+;  be covered by the GNU General Public License. This exception does
+;  not however invalidate any other reasons why the executable file
+;   might be covered by the GNU General Public License.
+;--------------------------------------------------------------------------
+
+        .module crt0
+       	.globl	_main
+
+	.area	_HEADER (ABS)
+	;; Reset vector
+	.org 	0
+	jp	init
+
+	.org	0x08
+	reti
+	.org	0x10
+	reti
+	.org	0x18
+	reti
+	.org	0x20
+	reti
+	.org	0x28
+	reti
+	.org	0x30
+	reti
+	.org	0x38
+	reti
+
+	.org	0x100
+init:
+	;; Stack at the top of memory.
+	ld	sp,#0x7fff
+
+        ;; Initialise global variables
+        call    gsinit
+	call	_main
+	jp	_exit
+
+	;; Ordering of segments for the linker.
+	.area	_HOME
+	.area	_CODE
+        .area   _GSINIT
+        .area   _GSFINAL
+
+	.area	_DATA
+	.area	_BSEG
+        .area   _BSS
+        .area   _HEAP
+
+        .area   _CODE
+__clock::
+	ld	a,#2
+        rst     0x08
+	ret
+
+_exit::
+	;; Exit - special code to the emulator
+	ld	a,#0
+        rst     0x08
+1$:
+	halt
+	jr	1$
+
+        .area   _GSINIT
+gsinit::
+
+        .area   _GSFINAL
+        ret
diff --git a/z80/uart/main.c b/z80/uart/main.c
new file mode 100644
index 0000000..be3a524
--- /dev/null
+++ b/z80/uart/main.c
@@ -0,0 +1,27 @@
+
+#include <stdio.h>
+
+__sfr __at 0x10 uart_data;
+__sfr __at 0x11 uart_rxfill;
+
+void putchar(char c) {
+	uart_data = c;
+}
+
+void main(void)
+{
+	char rx;
+
+	char hello[] = "Hallo, Welt!\n";
+
+	printf("%s", hello);
+
+	while(1) {
+		if(uart_rxfill) {
+			rx = uart_data;
+			printf("%c", rx);
+		}
+	}
+
+	while(1);
+}