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// #################################################################################################
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// # < simple timer usage example > #
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// # ********************************************************************************************* #
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// # Flashes LED using the timer 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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// Macros
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#define xstr(a) str(a)
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#define str(a) #a
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// Configuration
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#define BAUD_RATE 19200
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#define BLINK_LED 0 // pin 0 on GPIO.out
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#define BLINK_FREQ 4 // in Hz
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// Function prototypes
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void __attribute__((__interrupt__)) timer_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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// check if TIMER unit was synthesized, exit if no TIMER is available
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if (!(SYS_FEATURES & (1<<SYS_TIMER_EN))) {
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neo430_uart_br_print("Error! No TIMER unit synthesized!");
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return 1;
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}
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neo430_gpio_pin_clr(BLINK_LED); // clear LED
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// intro text
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neo430_uart_br_print("\nTimer blinking status LED at "xstr(BLINK_FREQ)" Hz.\n");
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// set address of timer IRQ handler
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IRQVEC_TIMER = (uint16_t)(&timer_irq_handler);
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// configure timer frequency
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neo430_timer_disable();
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uint16_t timer_thres;
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if (neo430_timer_config_freq(BLINK_FREQ, &timer_thres)) {
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neo430_uart_br_print("Invalid TIMER frequency!\n");
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}
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TMR_CT |= (1<<TMR_CT_EN) | (1<<TMR_CT_ARST) | (1<<TMR_CT_IRQ) | (1<<TMR_CT_RUN); // enable timer, auto-reset, irq enabled, timer start
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// enable global IRQs
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neo430_eint();
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while(1) {
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neo430_sleep();
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}
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return 0;
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}
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/* ------------------------------------------------------------
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* INFO Timer interrupt handler
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* ------------------------------------------------------------ */
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void __attribute__((__interrupt__)) timer_irq_handler(void) {
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neo430_gpio_pin_toggle(BLINK_LED);
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}
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