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Add joystick example to WaveShare Open103R

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This commit is contained in:
Joshua Harlan Lifton
2013-09-08 22:48:16 -07:00
committed by Piotr Esden-Tempski
parent d944c0cba6
commit b59c0a9e05
3 changed files with 185 additions and 0 deletions
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26
examples/stm32/f1/waveshare-open103r/joystick/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
## Copyright (C) 2013 Joshua Harlan Lifton <joshua.harlan.lifton@gmail.com>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = joystick
LDSCRIPT = ../waveshare-open103r.ld
include ../../Makefile.include

11
examples/stm32/f1/waveshare-open103r/joystick/README Normal file
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This example uses the joystick to control the four LEDs on the
WaveShare Open103R eval board. Joystick directions referenced here are
relative to the text printed on the eval board. Pressing up will
cycle the LED to a lower numbered LED (e.g. LED4 -> LED3 and LED1 ->
LED4), pressing down will cycle the LED the other way, pressing left
will turn on all LEDs, pressing right will turn off all LEDs, and
pressing center will toggle between blinking and solid on.

148
examples/stm32/f1/waveshare-open103r/joystick/joystick.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2013 Joshua Harlan Lifton <joshua.harlan.lifton@gmail.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
/* Joystick definitions */
#define JOY_PORT GPIOA
#define JOY_STATE GPIOA_IDR
#define JOY_LEFT GPIO0
#define JOY_UP GPIO1
#define JOY_DOWN GPIO2
#define JOY_RIGHT GPIO3
#define JOY_CENTER GPIO4
#define JOY_ALL (JOY_LEFT | JOY_UP | JOY_DOWN | JOY_RIGHT | JOY_CENTER)
#define JOY_DEBOUNCE_TICKS 20000
/* LED array definitions */
#define LED_PORT GPIOC
#define LED1 GPIO9
#define LED2 GPIO10
#define LED3 GPIO11
#define LED4 GPIO12
#define LED_ALL (LED1 | LED2 | LED3 | LED4)
#define BLINK_TICK 80000
uint16_t joy_state;
uint16_t led_state;
bool led_blinking;
/* Set STM32 to 24 MHz. */
static void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
}
static void led_setup(void)
{
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Set LEDs to output push-pull. */
gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, LED_ALL);
/* Turn off all LEDs. */
gpio_clear(LED_PORT, LED_ALL);
}
static void joystick_setup(void)
{
/* Enable GPIOA clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
/* Set joystick pins to input. */
gpio_set_mode(JOY_PORT, GPIO_MODE_INPUT,
GPIO_CNF_INPUT_PULL_UPDOWN,
JOY_ALL);
/* Enable all joystick pin pull-up resistors. */
gpio_set(JOY_PORT, JOY_ALL);
}
int main(void)
{
int i = 0;
int debounce = 0;
clock_setup();
led_setup();
joystick_setup();
joy_state = 0;
led_state = LED1;
led_blinking = false;
while (1) {
/* Set LED state according to joystick state. */
joy_state = (~JOY_STATE) & JOY_ALL;
if (joy_state != 0 && debounce == 0) {
debounce = 1;
gpio_clear(LED_PORT, LED_ALL);
if (joy_state & JOY_UP) {
if (led_state == LED_ALL || led_state == 0) {
led_state = LED4;
} else {
led_state >>= 1;
if (led_state < LED1) {
led_state = LED4;
}
}
} else if (joy_state & JOY_DOWN) {
if (led_state == LED_ALL || led_state == 0) {
led_state = LED1;
} else {
led_state <<= 1;
if (led_state > LED4 || led_state == 0) {
led_state = LED1;
}
}
} else if (joy_state & JOY_LEFT) {
led_state = LED_ALL;
} else if (joy_state & JOY_RIGHT) {
led_state = 0;
} else if (joy_state & JOY_CENTER) {
led_blinking = !led_blinking;
}
}
/* Debounce joystick press. */
else if (debounce > 0 && debounce < JOY_DEBOUNCE_TICKS) {
debounce++;
} else if (joy_state == 0 && debounce == JOY_DEBOUNCE_TICKS) {
debounce++;
}
/* Debounce joystick release. */
else if (debounce > JOY_DEBOUNCE_TICKS && debounce < 2*JOY_DEBOUNCE_TICKS) {
debounce++;
} else if (joy_state == 0 && debounce == 2*JOY_DEBOUNCE_TICKS) {
debounce = 0;
}
/* Update LEDs on the fly rather than wait for blink to complete. */
if (i++ < BLINK_TICK || !led_blinking) {
gpio_set(LED_PORT, led_state);
} else {
gpio_clear(LED_PORT, led_state);
}
if (i > 2*BLINK_TICK) {
i = 0;
}
}
return 0;
}