very simple LED flasher

2026-05-31 12:23:23 +08:00 · 2009-06-07 16:08:16 +00:00
parent 6d3ffb2ace
commit 84227448cf
2 changed files with 121 additions and 0 deletions
@@ -0,0 +1,56 @@
+
+MCU = attiny45
+
+PROG = dragon_isp
+DEV = usb
+#PROG = stk200
+#DEV = /dev/parport0
+
+APPNAME = blitzer
+
+CC      = avr-gcc
+OBJCOPY = avr-objcopy
+RM		= rm
+
+CFLAGS  = -Wall -g -mmcu=$(MCU) -Os -fpack-struct -fshort-enums -Wall -Wstrict-prototypes
+
+SOURCES =	blitzer.c
+
+all: $(APPNAME)
+
+clean:
+	$(RM) -f core $(APPNAME).o $(APPNAME) $(APPNAME).elf $(APPNAME).hex
+
+app: $(APPNAME)
+
+$(APPNAME):	$(SOURCES) Makefile
+	$(CC) $(CFLAGS) $(SOURCES) -o $(APPNAME).elf
+	$(OBJCOPY) -O ihex -R .eeprom $(APPNAME).elf $(APPNAME).hex
+
+flash: $(APPNAME)
+	avrdude -c $(PROG) -P $(DEV) -p $(MCU) -B 10 -U flash:w:$(APPNAME).hex
+
+flash_fuses:
+	avrdude -c $(PROG) -P $(DEV) -p $(MCU) -B 10 -U hfuse:w:0xdf:m
+	sleep 2
+	avrdude -c $(PROG) -P $(DEV) -p $(MCU) -B 10 -U lfuse:w:0x62:m
+
+# (this is the default on new chips)
+#
+# Fuse high byte:
+# 0xdf = 1 1 0 1   1 1 1 1 <-- BODLEVEL0 (Brown out trigger level bit 0)
+#        ^ ^ ^ ^   ^ ^ ^------ BODLEVEL1 (Brown out trigger level bit 1)
+#        | | | |   | +-------- BODLEVEL2 (Brown out trigger level bit 2)
+#        | | | |   + --------- EESAVE (don't preserve EEPROM over chip erase)
+#        | | | +-------------- WDTON (WDT not always on)
+#        | | +---------------- SPIEN (allow serial programming)
+#        | +------------------ DWEN (debug wire is enabled)
+#        +-------------------- RSTDISBL (reset pin is enabled)
+# Fuse low byte:
+# 0x62 = 0 1 1 0   0 0 1 0
+#        ^ ^ \ /   \--+--/
+#        | |  |       +------- CKSEL 3..0 (internal calibrated osc)
+#        | |  +--------------- SUT 1..0 (slowly rising power)
+#        | +------------------ CKOUT (clock output disabled)
+#        +-------------------- CKDIV8 (divide clock by eight enabled)
+
@@ -0,0 +1,65 @@
+/*
+ * $Id$
+ *  
+ * Copyright (C) 2009  Martin Mueller
+ *
+ * This file is part of paparazzi.
+ *
+ * paparazzi 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, or (at your option)
+ * any later version.
+ *
+ * paparazzi 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 paparazzi; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA. 
+ *
+ */
+
+/** \file blitzer.c
+ *  \brief LED flasher
+ *
+ *   Flashes a LED connected to PB1 (pin 6) of an ATTINY45 through 
+ * an IRML2502 transistor, PB1 low -> LED off.
+ *
+ * fuse high byte: 0xdf, fuse low byte: 0x62
+ *
+ */
+
+#include <avr/pgmspace.h>
+
+void wait(int msec_time)
+{
+  volatile unsigned short cnta, cntb;
+
+  /* roughly based on internal oscillator with divider by 8 enabled */
+  for (cnta = 0; cnta < msec_time; cnta++) {
+    for (cntb = 0; cntb < 38;cntb++) cntb=cntb;
+  }
+}
+
+int main(void)
+{
+  DDRB |=  (1 << PB1);  // PB1 output
+  DDRB &= ~(1 << PB0);  // PB0 input
+
+  while (1)
+  {
+    PORTB |=  (1 << PB1);
+    wait(25);
+    PORTB &= ~(1 << PB1);
+    wait(110);
+    PORTB |=  (1 << PB1);
+    wait(25);
+    PORTB &= ~(1 << PB1);
+    wait(780);
+  }
+
+  return(0);
+}