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// #################################################################################################
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// # << NEORV32 - Blinking LED Demo Program >> #
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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 NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
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// #################################################################################################
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/**********************************************************************//**
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* @file blink_led/main.c
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* @author Stephan Nolting
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* @brief Simple blinking LED demo program using the lowest 8 bits of the GPIO.output port.
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**************************************************************************/
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#include <neorv32.h>
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/**********************************************************************//**
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* @name User configuration
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**************************************************************************/
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/**@{*/
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/** UART BAUD rate */
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#define BAUD_RATE 19200
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/**@}*/
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/**********************************************************************//**
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* Main function; shows an incrementing 8-bit counter on GPIO.output(7:0).
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*
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* @note This program requires the GPIO controller to be synthesized (the UART is optional).
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*
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* @return Irrelevant.
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**************************************************************************/
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int main() {
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// init UART at default baud rate, no rx interrupt, no tx interrupt
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neorv32_uart_setup(BAUD_RATE, 0, 0);
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// check if GPIO unit is implemented at all
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if (neorv32_gpio_available() == 0) {
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neorv32_uart_print("Error! No GPIO unit synthesized!\n");
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return 0; // nope, no GPIO unit synthesized
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}
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// capture all exceptions and give debug info via UART
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// this is not required, but keeps us safe
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neorv32_rte_setup();
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// say hello
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neorv32_uart_print("Blinking LED demo program\n");
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neorv32_gpio_port_set(0); // clear gpio output put
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int cnt = 0;
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while (1) {
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neorv32_gpio_port_set(cnt++ & 0xFF); // increment counter and mask for lowest 8 bit
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neorv32_cpu_delay_ms(200); // wait 200ms using busy wait
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}
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return 0;
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}
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