From ad2623d8c4bc51638343ae9a628f8647ff558155 Mon Sep 17 00:00:00 2001
From: Thomas Albers <thomas@thomaslabs.org>
Date: Mon, 14 Aug 2023 10:47:54 +0200
Subject: Initial commit

---
 template/Makefile   | 31 ++++++++++++++++++++++++++++
 template/crt0.asm   | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 template/template.c | 30 +++++++++++++++++++++++++++
 3 files changed, 120 insertions(+)
 create mode 100644 template/Makefile
 create mode 100644 template/crt0.asm
 create mode 100644 template/template.c

(limited to 'template')

diff --git a/template/Makefile b/template/Makefile
new file mode 100644
index 0000000..32ce503
--- /dev/null
+++ b/template/Makefile
@@ -0,0 +1,31 @@
+ASM=crt0.asm
+SRC=bootloader.c
+
+OBJ=$(ASM:%.asm=build/%.rel) $(SRC:%.c=build/%.rel)
+IHX=output/bootloader.ihx
+TARGET=bootloader.hex
+
+CFLAGS=-mz80
+LDFLAGS=-mz80 --no-std-crt0 --code-loc 0x4010 -Wl-b_GSINIT=0x4150
+
+all : $(TARGET)
+
+output/%.rel : %.asm
+	sdasz80 -g -o $@ $<
+
+output/%.rel : %.c
+	sdcc $(CFLAGS) -c -o $@ $<
+
+$(IHX) : $(OBJ)
+	sdcc $(LDFLAGS) -o $@ $(OBJ)
+
+$(TARGET) : $(IHX)
+	hex2bin.py $< $@
+
+.PHONY: upload
+upload:
+	z80up $(TARGET) -p /dev/ttyUSB0
+
+.PHONY : clean
+clean :
+	@rm -rf output/* $(TARGET)
diff --git a/template/crt0.asm b/template/crt0.asm
new file mode 100644
index 0000000..24c475d
--- /dev/null
+++ b/template/crt0.asm
@@ -0,0 +1,59 @@
+	.module crt0
+	.globl	_main
+
+	.area	_HEADER (ABS)
+	;; Reset vector
+	.org 	0x4000
+init:
+	call	gsinit
+	call	_main
+1$:
+	halt
+	jr	1$
+
+	;; Ordering of segments for the linker.
+	.area	_HOME
+	.area	_CODE
+	.area	_INITIALIZER
+	.area   _GSINIT
+	.area   _GSFINAL
+
+	.area	_DATA
+	.area	_INITIALIZED
+	.area	_BSEG
+	.area   _BSS
+	.area   _HEAP
+
+	.area   _CODE
+
+	.area   _GSINIT
+gsinit:
+	;; Default-initialized global variables.
+    ld      bc, #l__DATA
+    ld      a, b
+    or      a, c
+    jr      Z, zeroed_data
+    ld      hl, #s__DATA
+    ld      (hl), #0x00
+    dec     bc
+    ld      a, b
+    or      a, c
+    jr      Z, zeroed_data
+    ld      e, l
+    ld      d, h
+    inc     de
+    ldir
+zeroed_data:
+	;; Explicitly initialized global variables.
+	ld	bc, #l__INITIALIZER
+	ld	a, b
+	or	a, c
+	jr	Z, gsinit_next
+	ld	de, #s__INITIALIZED
+	ld	hl, #s__INITIALIZER
+	ldir
+
+gsinit_next:
+
+	.area   _GSFINAL
+	ret
diff --git a/template/template.c b/template/template.c
new file mode 100644
index 0000000..8237d68
--- /dev/null
+++ b/template/template.c
@@ -0,0 +1,30 @@
+#define CPU_FREQ 1843200
+
+__sfr __at 0x30 sio_a_data;
+__sfr __at 0x31 sio_b_data;
+__sfr __at 0x32 sio_a_ctrl;
+__sfr __at 0x33 sio_b_ctrl;
+
+void putchar(char c)
+{
+    unsigned char ctrl = 0;
+
+    sio_a_data = c;
+
+    while (!(ctrl & 0x04)) {
+        sio_a_ctrl = ctrl;
+        ctrl = sio_a_ctrl;
+    }
+}
+
+void print(const char *str)
+{
+    for (; *str; str++)
+        putchar(*str);
+}
+
+int main()
+{
+    print("Hello World from C");
+    return 0;
+}
-- 
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