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[/] [neo430/] [trunk/] [neo430/] [sw/] [example/] [gpio_interrupt/] [main.c] - Rev 198
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// ################################################################################################# // # < GPIO interrupt example program > # // # ********************************************************************************************* # // # Prints a message whenever a GPIO input pin goes HIGH. Uses the PIO pin-change interrupt. # // # ********************************************************************************************* # // # BSD 3-Clause License # // # # // # Copyright (c) 2020, Stephan Nolting. All rights reserved. # // # # // # Redistribution and use in source and binary forms, with or without modification, are # // # permitted provided that the following conditions are met: # // # # // # 1. Redistributions of source code must retain the above copyright notice, this list of # // # conditions and the following disclaimer. # // # # // # 2. Redistributions in binary form must reproduce the above copyright notice, this list of # // # conditions and the following disclaimer in the documentation and/or other materials # // # provided with the distribution. # // # # // # 3. Neither the name of the copyright holder nor the names of its contributors may be used to # // # endorse or promote products derived from this software without specific prior written # // # permission. # // # # // # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS # // # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF # // # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE # // # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, # // # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE # // # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED # // # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING # // # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED # // # OF THE POSSIBILITY OF SUCH DAMAGE. # // # ********************************************************************************************* # // # The NEO430 Processor - https://github.com/stnolting/neo430 # // ################################################################################################# // Libraries #include <stdint.h> #include <neo430.h> // Configuration #define BAUD_RATE 19200 // Function prototypes void __attribute__((__interrupt__)) gpio_irq_handler(void); /* ------------------------------------------------------------ * INFO Main function * ------------------------------------------------------------ */ int main(void) { // setup UART neo430_uart_setup(BAUD_RATE); // intro text neo430_uart_br_print("\nGPIO pin change interrupt demo program\n\n"); // check if GPIO present if (!(SYS_FEATURES & (1<<SYS_GPIO_EN))) { neo430_uart_br_print("Error! No GPIO unit synthesized!"); return 1; } // deactivate all LEDs GPIO_OUTPUT = 0; // set address of IRQ handler IRQVEC_GPIO = (uint16_t)(&gpio_irq_handler); // configure GPIO pin-change interrupt GPIO_IRQMASK = 0xFFFF; // use all input pins as trigger // enable global IRQs neo430_eint(); // go to sleep mode, increment counter whenever the CPU wakes up while (1) { neo430_sleep(); GPIO_OUTPUT = (GPIO_OUTPUT + 1) & 0x00FF; // increment LED counter } return 0; } /* ------------------------------------------------------------ * INFO GPIO pin-change interrupt handler * ------------------------------------------------------------ */ void __attribute__((__interrupt__)) gpio_irq_handler(void) { // we cannot 100% ensure to actually get the specific state of // the input, which caused the IRQ neo430_uart_br_print("GPIO pin change interrupt! Current input state: 0x"); neo430_uart_print_hex_word(GPIO_INPUT); neo430_uart_br_print("\n"); }