initial commit

master
Christian Ulrich 2020-03-27 14:58:01 +01:00
commit ca6f4171c7
5 changed files with 404 additions and 0 deletions

121
COPYING Normal file
View File

@ -0,0 +1,121 @@
Creative Commons Legal Code
CC0 1.0 Universal
CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
HEREUNDER.
Statement of Purpose
The laws of most jurisdictions throughout the world automatically confer
exclusive Copyright and Related Rights (defined below) upon the creator
and subsequent owner(s) (each and all, an "owner") of an original work of
authorship and/or a database (each, a "Work").
Certain owners wish to permanently relinquish those rights to a Work for
the purpose of contributing to a commons of creative, cultural and
scientific works ("Commons") that the public can reliably and without fear
of later claims of infringement build upon, modify, incorporate in other
works, reuse and redistribute as freely as possible in any form whatsoever
and for any purposes, including without limitation commercial purposes.
These owners may contribute to the Commons to promote the ideal of a free
culture and the further production of creative, cultural and scientific
works, or to gain reputation or greater distribution for their Work in
part through the use and efforts of others.
For these and/or other purposes and motivations, and without any
expectation of additional consideration or compensation, the person
associating CC0 with a Work (the "Affirmer"), to the extent that he or she
is an owner of Copyright and Related Rights in the Work, voluntarily
elects to apply CC0 to the Work and publicly distribute the Work under its
terms, with knowledge of his or her Copyright and Related Rights in the
Work and the meaning and intended legal effect of CC0 on those rights.
1. Copyright and Related Rights. A Work made available under CC0 may be
protected by copyright and related or neighboring rights ("Copyright and
Related Rights"). Copyright and Related Rights include, but are not
limited to, the following:
i. the right to reproduce, adapt, distribute, perform, display,
communicate, and translate a Work;
ii. moral rights retained by the original author(s) and/or performer(s);
iii. publicity and privacy rights pertaining to a person's image or
likeness depicted in a Work;
iv. rights protecting against unfair competition in regards to a Work,
subject to the limitations in paragraph 4(a), below;
v. rights protecting the extraction, dissemination, use and reuse of data
in a Work;
vi. database rights (such as those arising under Directive 96/9/EC of the
European Parliament and of the Council of 11 March 1996 on the legal
protection of databases, and under any national implementation
thereof, including any amended or successor version of such
directive); and
vii. other similar, equivalent or corresponding rights throughout the
world based on applicable law or treaty, and any national
implementations thereof.
2. Waiver. To the greatest extent permitted by, but not in contravention
of, applicable law, Affirmer hereby overtly, fully, permanently,
irrevocably and unconditionally waives, abandons, and surrenders all of
Affirmer's Copyright and Related Rights and associated claims and causes
of action, whether now known or unknown (including existing as well as
future claims and causes of action), in the Work (i) in all territories
worldwide, (ii) for the maximum duration provided by applicable law or
treaty (including future time extensions), (iii) in any current or future
medium and for any number of copies, and (iv) for any purpose whatsoever,
including without limitation commercial, advertising or promotional
purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each
member of the public at large and to the detriment of Affirmer's heirs and
successors, fully intending that such Waiver shall not be subject to
revocation, rescission, cancellation, termination, or any other legal or
equitable action to disrupt the quiet enjoyment of the Work by the public
as contemplated by Affirmer's express Statement of Purpose.
3. Public License Fallback. Should any part of the Waiver for any reason
be judged legally invalid or ineffective under applicable law, then the
Waiver shall be preserved to the maximum extent permitted taking into
account Affirmer's express Statement of Purpose. In addition, to the
extent the Waiver is so judged Affirmer hereby grants to each affected
person a royalty-free, non transferable, non sublicensable, non exclusive,
irrevocable and unconditional license to exercise Affirmer's Copyright and
Related Rights in the Work (i) in all territories worldwide, (ii) for the
maximum duration provided by applicable law or treaty (including future
time extensions), (iii) in any current or future medium and for any number
of copies, and (iv) for any purpose whatsoever, including without
limitation commercial, advertising or promotional purposes (the
"License"). The License shall be deemed effective as of the date CC0 was
applied by Affirmer to the Work. Should any part of the License for any
reason be judged legally invalid or ineffective under applicable law, such
partial invalidity or ineffectiveness shall not invalidate the remainder
of the License, and in such case Affirmer hereby affirms that he or she
will not (i) exercise any of his or her remaining Copyright and Related
Rights in the Work or (ii) assert any associated claims and causes of
action with respect to the Work, in either case contrary to Affirmer's
express Statement of Purpose.
4. Limitations and Disclaimers.
a. No trademark or patent rights held by Affirmer are waived, abandoned,
surrendered, licensed or otherwise affected by this document.
b. Affirmer offers the Work as-is and makes no representations or
warranties of any kind concerning the Work, express, implied,
statutory or otherwise, including without limitation warranties of
title, merchantability, fitness for a particular purpose, non
infringement, or the absence of latent or other defects, accuracy, or
the present or absence of errors, whether or not discoverable, all to
the greatest extent permissible under applicable law.
c. Affirmer disclaims responsibility for clearing rights of other persons
that may apply to the Work or any use thereof, including without
limitation any person's Copyright and Related Rights in the Work.
Further, Affirmer disclaims responsibility for obtaining any necessary
consents, permissions or other rights required for any use of the
Work.
d. Affirmer understands and acknowledges that Creative Commons is not a
party to this document and has no duty or obligation with respect to
this CC0 or use of the Work.

15
Makefile Normal file
View File

@ -0,0 +1,15 @@
CFLAGS += -I /nix/store/8dm9wns7cjcjd3527s87lk4s8a1z6k93-avr-libc-2.0.0/avr/include
CFLAGS += -B /nix/store/8dm9wns7cjcjd3527s87lk4s8a1z6k93-avr-libc-2.0.0/avr/lib/avr25
CFLAGS += -L /nix/store/8dm9wns7cjcjd3527s87lk4s8a1z6k93-avr-libc-2.0.0/avr/lib/avr25
CFLAGS += -L /nix/store/8dm9wns7cjcjd3527s87lk4s8a1z6k93-avr-gcc-5.4.0/lib/gcc/avr/5.4.0/avr25
default:
# compile for attiny86 with warnings, optimizations, and 1 MHz clock frequency
avr-gcc $(CFLAGS) -Wall -Os -DF_CPU=8000000 -mmcu=attiny85 -o evinlight.o evinlight.c
avr-objcopy -j .text -j .data -O ihex evinlight.o evinlight.hex
avrdude -c buspirate -P /dev/ttyUSB0 -p t85 -U flash:w:evinlight.hex:i
stty -F /dev/ttyUSB0 115200 raw -echo -echoe -echok -echoctl -echoke
echo -e -n "m\n2\nW\n" > /dev/ttyUSB0
clean: /dev/null
rm -f evinlight.o evinlight.hex

103
README.md Normal file
View File

@ -0,0 +1,103 @@
# ATTiny85 Hello World
Blinking an LED using an ATTiny85 programmed with `avr-gcc` and `avrdude` on Mac OS X.
## Mac OS X AVR toolchain install
Using Homebrew, tap [larsimmisch's homebrew-avr repository](https://github.com/larsimmisch/homebrew-avr):
```
brew tap larsimmisch/avr
brew install avr-libc
```
## Build steps
1. Compile with `avr-gcc`
2. Prepare the hex file with `avr-objcopy`
3. Flash the hex with `avrdude`
```
avr-gcc -Wall -Os -DF_CPU=1000000 -mmcu=attiny85 -o hello.o hello.c
avr-objcopy -j .text -j .data -O ihex hello.o hello.hex
avrdude -c usbtiny -p t85 -U flash:w:hello.hex:i
```
`F_CPU` must be defined at the `avr-gcc` command line or above the `#include <util/delay.h>`
so the delay library knows the microcontroller's clock speed.
## Breadboard configuration
Wire the ISP-6 cable from the USBTinyISP to the breadboarded ATTiny85 using jumpers.
### ISP-6 pinout
Looking at the ISP-6 *cable* with the connector key at the bottom, the pins are numbered
like this:
```
+-----------+
|(6) (4) (2)|
|(5) (3) (1)|
+-----------+
|_|
```
1. MISO
2. Vcc
3. SCK
4. MOSI
5. Reset
6. Ground
(See also [this photo](http://www.ics.uci.edu/~givargis/courses/cs145/resources/avrisp.png))
### ATTiny85 pintout
The ATTiny85's pins are:
```
(8) (7) (6) (5)
+---------------+
| |
| o |
+---------------+
(1) (2) (3) (4)
```
1. PB5 (Reset)
2. PB3
3. PB4
4. Ground
5. PB0 (MOSI)
6. PB1 (MISO)
7. PB2 (SCK)
8. Vcc
### Programming jumpers
Connect the ISP and the ATTiny85 together on the Ground, MISO (Master In, Slave Out),
MOSI (Master Out, Slave In), SCK (Serial ClocK), Reset, and Vcc pins:
- ISP-6 pin 1ATTiny85 pin 6 (MISO)
- ISP-6 pin 2ATTiny85 pin 8 (Vcc)
- ISP-6 pin 3ATTiny85 pin 7 (SCK)
- ISP-6 pin 4ATTiny85 pin 5 (MOSI)
- ISP-6 pin 5ATTiny85 pin 1 (Reset)
- ISP-6 pin 6ATTiny85 pin 4 (Ground)
N.B. The ATTiny's pins 2 and 3 are unconnected.
### LED circuit
Power the LED with a transistor and a series resistor, switching the transistor using a resistor
from the ATTiny's pin 2 to the transistor's base.
## References
- [Honey, I Shrunk the Arduino](http://www.instructables.com/id/Honey-I-Shrunk-the-Arduino-Moving-from-Arduino-t/?ALLSTEPS)
- [ATTiny85 and ISP-6 pinouts](http://fabienroyer.wordpress.com/2010/12/12/build-a-cheap-flexible-avr-microcontroller-programming-target-board/)
- [ATTiny85 pinout](http://teslaui.files.wordpress.com/2012/11/attiny85_pins.png)
- [Atmel's in-system programming documentation](http://www.atmel.com/Images/doc0943.pdf)

15
default.nix Normal file
View File

@ -0,0 +1,15 @@
let
pkgs = import <nixpkgs> {};
in with pkgs; {
simpleEnv = stdenv.mkDerivation {
name = "simple-env";
version = "1";
buildInputs = [
avrgcc
avrbinutils
avrlibc
avrdude
picocom
];
};
}

150
evinlight.c Normal file
View File

@ -0,0 +1,150 @@
/**
*
* Blinking LED ATTiny85 "hello world"
*
* Following the tutorial at:
* http://www.instructables.com/id/Honey-I-Shrunk-the-Arduino-Moving-from-Arduino-t/?ALLSTEPS
*
*/
#include <avr/io.h>
// F_CPU frequency to be defined at command line
#include <util/delay.h>
#define TRUE 1
#define FALSE 0
#define LED0 PB3
#define LED1 PB2
#define LED2 PB1
#define LED3 PB0
#define LED4 PB4
const int leds[] = {LED0, LED1, LED2, LED3, LED4};
#define LED_COUNT (sizeof(leds) / sizeof(leds[0]))
uint8_t led_states[LED_COUNT];
#define DELAY_NORMAL 100;
#define DELAY_SLOW 150;
#define DELAY_FAST 50;
const int DELAY = DELAY_NORMAL;
void led_on(int led_index)
{
PORTB |= (1 << leds[led_index]);
led_states[led_index] = 1;
}
void led_off(int led_index)
{
PORTB &= ~(1 << leds[led_index]);
led_states[led_index] = 0;
}
void setup_leds()
{
for (int i = 0; i != LED_COUNT; ++i)
{
DDRB |= (1 << leds[i]);
led_off(i);
led_states[i] = 0;
}
}
void accumulate_next(int led_index)
{
if(led_states[led_index])
{
led_off(led_index);
}
else
{
led_on(led_index);
}
_delay_ms(DELAY);
}
void accumulate()
{
for (int i = 0; i != LED_COUNT; ++i)
accumulate_next(i);
}
void accumulate_backwards()
{
for (int i = LED_COUNT - 1; i >= 0; --i)
accumulate_next(i);
}
void row_next(int led_index, int previous_led_index)
{
led_on(led_index);
led_off(previous_led_index);
_delay_ms(DELAY);
}
void row()
{
for (int i = 0; i != LED_COUNT; ++i)
{
int previous = (i + LED_COUNT - 1) % LED_COUNT;
row_next(i, previous);
}
}
void row_backwards()
{
for (int i = LED_COUNT - 1; i >= 0; --i)
{
int previous = (i + 1) % LED_COUNT;
row_next(i, previous);
}
}
void all_on()
{
for (int i = 0; i != LED_COUNT; ++i)
led_on(i);
}
void toggle_all()
{
for (int i = 0; i != LED_COUNT; ++i)
{
if(led_states[i])
led_off(i);
else
led_on(i);
}
}
void blink(int ntimes)
{
setup_leds();
for (int i = 0; i != ntimes * 2; ++i)
{
toggle_all();
_delay_ms(DELAY);
}
}
int main ()
{
setup_leds();
while (1)
{
accumulate();
accumulate_backwards();
accumulate();
accumulate_backwards();
row();
row_backwards();
row();
row_backwards();
blink(5);
}
return 0;
}