Abschluß Sommersemester 2023

20230524/bit-ops-01.c

+#include <avr/io.h>
+
+int main (void)
+{
+  uint8_t mask;
+  DDRD = 0xff;
+  PORTD = 0xf0;
+  mask = 1;
+  mask <<= 3;
+  PORTD |= mask;
+  mask = 1;
+  mask <<= 4;
+  PORTD &= ~mask;
+  mask = 1;
+  mask <<= 0;
+  PORTD ^= mask;
+  while (1);
+  return 0;
+}

20230524/bit-ops-01.s

+	.file	"bit-ops-01.c"
+__SP_H__ = 0x3e
+__SP_L__ = 0x3d
+__SREG__ = 0x3f
+__tmp_reg__ = 0
+__zero_reg__ = 1
+	.text
+.global	main
+	.type	main, @function
+main:
+/* prologue: function */
+/* frame size = 0 */
+/* stack size = 0 */
+.L__stack_usage = 0
+	ldi r24,lo8(-1)
+	out 0xa,r24
+	ldi r24,lo8(-16)
+	out 0xb,r24
+	sbi 0xb,3
+	cbi 0xb,4
+	in r25,0xb
+	ldi r24,lo8(1)
+	eor r24,r25
+	out 0xb,r24
+.L2:
+	rjmp .L2
+	.size	main, .-main
+	.ident	"GCC: (GNU) 5.4.0"

20230531/Makefile

+%.elf: %.c
+	avr-gcc -Wall -Os -mmcu=atmega328p $< -o $@
+
+%.hex: %.elf
+	avr-objcopy -O ihex $< $@
+
+download:
+	./download.sh

20230531/blink_interlaced.s

+    .text
+
+    .global main
+    .type main, @function
+
+main:
+    ldi r24,0xff  ; 1111 1111 to r24
+    out 0x04,r24  ; r24 to 0x04 (DDRB)
+    out 0x0a,r24  ; r24 to 0x0a (DDRD)
+    
+
+loop:
+    ldi r24,0x00
+    out 0x05,r24
+    ldi r24,0x04
+    out 0x0b,r24
+    
+    ldi r26,lo8(7999999)
+    ldi r22,hi8(7999999)
+    ldi r23,hlo8(7999999)
+1:
+    subi r26,1      ; sub immediately
+    sbci r22,0      ; sub carry immediately
+    sbci r23,0
+    brne 1b         ; branch not equal (not zero)
+    rjmp .
+    nop
+
+    ldi r24,0x20
+    out 0x05,r24
+    ldi r24,0x00
+    out 0x0b,r24
+
+    ldi r26,lo8(7999999)
+    ldi r22,hi8(7999999)
+    ldi r23,hlo8(7999999)
+
+1: 
+    subi r26,1  ; 1 cycle
+    sbci r22,0
+    sbci r23,0
+    brne 1b     ; 2 cycles when jump, 1 if not
+    rjmp .     ; 2 cycle nop
+    nop         ; 1 cycle nop
+
+    jmp loop

20230531/download.sh

+port=$(ls -rt /dev/ttyACM* | tail -1)
+echo avrdude -P $port -c arduino -p m328p -U flash:w:$(ls -rt *.hex | tail -1)
+avrdude -P $port -c arduino -p m328p -U flash:w:$(ls -rt *.hex | tail -1) 2>/dev/null

20230620/rtech-20230620.tex

@@ -224,7 +224,7 @@
       .ppm.xz-Dateien sind kleiner als .png-Dateien
     \item
       mehrere Dateien, zusammengefaßt:\\
-      .ar, .tar
+      .a, .tar
     \item
       mehrere Dateien, zusammengefaßt und komprimiert:\\
       .tar.gz, .tar.bz2, .tar.xz, .zip, .7z