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Merge remote-tracking branch 'upstream/master' into spi_bitbang
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‎examples/board_rotenc/Makefile

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#
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# Copyright 2008-2012 Michel Pollet <[email protected]>
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# Copyright 2018 Doug Szumski <[email protected]>
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#
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# This file is part of simavr.
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#
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# simavr is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# simavr is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with simavr. If not, see <http://www.gnu.org/licenses/>.
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target=rotenc_test
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firm_src = ${wildcard at*${board}.c}
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firmware = ${firm_src:.c=.axf}
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simavr = ../..
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IPATH = .
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IPATH += ${simavr}/examples/shared
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IPATH += ${simavr}/examples/parts
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IPATH += ${simavr}/include
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IPATH += ${simavr}/simavr/sim
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VPATH = .
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VPATH += ${simavr}/examples/shared
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VPATH += ${simavr}/examples/parts
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LDFLAGS += -lpthread
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include ../Makefile.opengl
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all: obj ${firmware} ${target}
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include ${simavr}/Makefile.common
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atmega1280_${target}.axf: atmega32_${target}.c
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board = ${OBJ}/${target}.elf
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${board} : ${OBJ}/${target}.o
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${board} : ${OBJ}/rotenc.o
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${target}: ${board}
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@echo $@ done
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clean: clean-${OBJ}
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rm -rf *.hex *.a *.axf ${target} *.vcd .*.swo .*.swp .*.swm .*.swn

‎examples/board_rotenc/README

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board_rotenc
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This sample code demonstrates the use of a virtual Panasonic EVEP rotary
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encoder. The encoder is hooked up to an LED array, and is used to scroll
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an LED up and down. It behaves just like in real life, except contact
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bounce is not modelled.

‎examples/board_rotenc/atmega32_rotenc_test.c

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/*
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atmega32_rotenc_test.c
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A simple example demonstrating a Pansonic EVEP rotary encoder
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scrolling an LED up and down an 8 segment LED bar.
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Copyright 2018 Doug Szumski <[email protected]>
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This file is part of simavr.
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simavr is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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simavr is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with simavr. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/sleep.h>
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#include <stdio.h>
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#include "avr_mcu_section.h"
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AVR_MCU(F_CPU, "atmega32");
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typedef enum {
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CLOCKWISE,
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COUNTERCLOCKWISE
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} led_scroll_dir_t;
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/* Initialise the inputs for signal A and signal B from the rotary encoder.
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* They are hooked up to INTO on PD2 and GPIO pin PA0. Pull-ups are on the
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* PCB. */
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void
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rotary_spin_int_init(void)
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{
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// Set INT0 and GPIO pin as inputs
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DDRD &= ~(1 << PD2) & ~(1 << PA0);
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// Any logical change on INT0 generates an interrupt (see DS p.67)
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MCUCR |= (1 << ISC00);
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MCUCR &= ~(1 << ISC01);
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// Enable interrupt pin PD2
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GICR |= (1 << INT0);
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}
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/* Initialise inputs for signal C from the rotary encoder (button). This
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* is hooked up to INT2 on PB2. A pull-up is on the PCB. */
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void
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rotary_button_int_init(void)
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{
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DDRB &= ~(1 << PB2);
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// Falling edge trigger (pin is pulled up) (see DS p.67)
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MCUCSR &= ~(1 << ISC2);
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// Enable interrupt pin PB2
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GICR |= (1 << INT2);
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}
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/* Configure 8 segment virtual 'LED bar' on port C */
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void
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led_bar_init(void)
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{
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DDRC = 0xFF; // All outputs
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PORTC = 0b00010000; // Start with a light on in the middle
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}
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void
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led_bar_scroll(led_scroll_dir_t dir)
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{
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switch (dir) {
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case CLOCKWISE:
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if (PORTC < 0b10000000) PORTC <<= 1;
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break;
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case COUNTERCLOCKWISE:
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if (PORTC > 0b00000001) PORTC >>= 1;
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break;
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default:
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break;
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}
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}
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int
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main()
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{
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// Disable interrupts whilst configuring them to avoid false triggers
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cli();
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rotary_spin_int_init();
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rotary_button_int_init();
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sei();
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led_bar_init();
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while (1) {
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// Wait for some input
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}
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cli();
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sleep_mode();
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}
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ISR(INT0_vect)
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{
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// The Panasonic EVEP rotary encoder this is written for moves two
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// phases for every 'click' it emits. The interrupt is configured
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// to fire on every edge change of B, which is once per 'click'.
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// Moving forwards in phase, after B has changed state we poll A.
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// We get the sequence (A=0,B=1), (A=1,B=0). Moving backwards in
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// phase, after B has changed state we get (A=1,B=1), (A=0,B=0).
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//
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// +-------+---+---+
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// | Phase | A | B |
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// +-------+---+---+
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// | 0 | 0 | 0 |
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// | 1 | 0 | 1 |
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// | 2 | 1 | 1 |
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// | 3 | 1 | 0 |
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// +-------+---+---+
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//
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// The twist direction is then obtained by taking the logical
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// XOR of outputs A and B after the interrupt has fired. Of
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// course with a 'real life' part you might be better off
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// using a state machine, or some extra hardware to filter out
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// contact bounces which aren't modelled in the virtual part.
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uint8_t ccw_twist = ((PIND & (1 << PD2)) >> 2) ^ (PINA & (1 << PA0));
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// Scroll the LED bar
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if (ccw_twist) {
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led_bar_scroll(COUNTERCLOCKWISE);
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} else {
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led_bar_scroll(CLOCKWISE);
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}
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}
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ISR(INT2_vect)
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{
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// Fires when rotary encoder button was pressed and resets
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// the LED bar to the starting position
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PORTC = 0b00010000;
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}

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