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// #################################################################################################
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// # < GPIO interrupt example program > #
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// # ********************************************************************************************* #
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// # Prints a message whenever a GPIO input pin goes HIGH. Uses the PIO pin-change interrupt. #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEO430 Processor - https://github.com/stnolting/neo430 #
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// #################################################################################################
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// Libraries
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#include <stdint.h>
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#include <neo430.h>
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// Configuration
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#define BAUD_RATE 19200
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// Function prototypes
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void __attribute__((__interrupt__)) gpio_irq_handler(void);
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/* ------------------------------------------------------------
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* INFO Main function
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* ------------------------------------------------------------ */
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int main(void) {
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// setup UART
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neo430_uart_setup(BAUD_RATE);
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// intro text
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neo430_uart_br_print("\nGPIO pin change interrupt demo program\n\n");
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// check if GPIO present
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if (!(SYS_FEATURES & (1<<SYS_GPIO_EN))) {
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neo430_uart_br_print("Error! No GPIO unit synthesized!");
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return 1;
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}
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// deactivate all LEDs
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GPIO_OUTPUT = 0;
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// set address of IRQ handler
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IRQVEC_GPIO = (uint16_t)(&gpio_irq_handler);
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// configure GPIO pin-change interrupt
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GPIO_IRQMASK = 0xFFFF; // use all input pins as trigger
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// enable global IRQs
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neo430_eint();
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// go to sleep mode, increment counter whenever the CPU wakes up
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while (1) {
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neo430_sleep();
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GPIO_OUTPUT = (GPIO_OUTPUT + 1) & 0x00FF; // increment LED counter
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}
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return 0;
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}
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/* ------------------------------------------------------------
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* INFO GPIO pin-change interrupt handler
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* ------------------------------------------------------------ */
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void __attribute__((__interrupt__)) gpio_irq_handler(void) {
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// we cannot 100% ensure to actually get the specific state of
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// the input, which caused the IRQ
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neo430_uart_br_print("GPIO pin change interrupt! Current input state: 0x");
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neo430_uart_print_hex_word(GPIO_INPUT);
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neo430_uart_br_print("\n");
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}
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