Subversion Repositories neorv32

// #################################################################################################
// # << NEORV32 - Blinking LED Demo Program >>                                                     #
// # ********************************************************************************************* #
// # 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.                                                                                #
// #                                                                                               #
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// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #
// #################################################################################################
 
 
/**********************************************************************//**
 * @file blink_led/main.c
 * @author Stephan Nolting
 * @brief Simple blinking LED demo program using the lowest 8 bits of the GPIO.output port.
 **************************************************************************/
 
#include <neorv32.h>
 
 
/**********************************************************************//**
 * @name User configuration
 **************************************************************************/
/**@{*/
/** UART BAUD rate */
#define BAUD_RATE 19200
/**@}*/
 
 
/**********************************************************************//**
 * Main function, shows an incrementing 8-bit timer on GPIO.output(7:0).
 *
 * @note This program requires the GPIO to be synthesized (the UART is optional).
 *
 * @return Irrelevant.
 **************************************************************************/
int main() {
 
  // check if GPIO unit is implemented at all
  if (neorv32_gpio_available() == 0) {
    return 0; // nope, no GPIO unit synthesized :(
  }
 
 
  // capture all exceptions and give debug info via UART
  // this is not required, but keeps us safe
  neorv32_rte_enable_debug_mode();
 
 
  // init UART at default baud rate, no rx interrupt, no tx interrupt
  neorv32_uart_setup(BAUD_RATE, 0, 0);
 
  // say hello
  neorv32_uart_print("Blinking LED demo program\n");
 
 
  neorv32_gpio_port_set(0); // clear gpio output put
 
  int cnt = 0;
 
  while (1) {
    neorv32_gpio_port_set(cnt & 0xFF); // mask for lowest 8 bit
    neorv32_cpu_delay_ms(200); // wait 0.2s using busy wait
    cnt++; // increment counter
  }
 
  return 0;
}