commit ca6f4171c7ce02caeedf88443598ed98f7606498 Author: Christian Ulrich Date: Fri Mar 27 14:58:01 2020 +0100 initial commit diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..0e259d4 --- /dev/null +++ b/COPYING @@ -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. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..9c22ae7 --- /dev/null +++ b/Makefile @@ -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 diff --git a/README.md b/README.md new file mode 100644 index 0000000..ba8fe01 --- /dev/null +++ b/README.md @@ -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 ` +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 1–ATTiny85 pin 6 (MISO) +- ISP-6 pin 2–ATTiny85 pin 8 (Vcc) +- ISP-6 pin 3–ATTiny85 pin 7 (SCK) +- ISP-6 pin 4–ATTiny85 pin 5 (MOSI) +- ISP-6 pin 5–ATTiny85 pin 1 (Reset) +- ISP-6 pin 6–ATTiny85 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) + diff --git a/default.nix b/default.nix new file mode 100644 index 0000000..8f1f785 --- /dev/null +++ b/default.nix @@ -0,0 +1,15 @@ +let + pkgs = import {}; +in with pkgs; { + simpleEnv = stdenv.mkDerivation { + name = "simple-env"; + version = "1"; + buildInputs = [ + avrgcc + avrbinutils + avrlibc + avrdude + picocom + ]; + }; +} diff --git a/evinlight.c b/evinlight.c new file mode 100644 index 0000000..bfc59e1 --- /dev/null +++ b/evinlight.c @@ -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 +// F_CPU frequency to be defined at command line +#include + +#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; +} +