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// # << NEORV32 - Blinking LED Demo Program >>                                                     #
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// # BSD 3-Clause License                                                                          #
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// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #
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/**********************************************************************//**
 * @file demo_blink_led/main.c
 * @author Stephan Nolting
 * @brief Minimal blinking LED demo program using the lowest 8 bits of the GPIO.output port.
 **************************************************************************/
#include <neorv32.h>


/**********************************************************************//**
 * Main function; shows an incrementing 8-bit counter on GPIO.output(7:0).
 *
 * @note This program requires the GPIO controller to be synthesized.
 *
 * @return Will never return.
 **************************************************************************/
int main() {

  // clear GPIO output (set all bits to 0)
  neorv32_gpio_port_set(0);

  int cnt = 0;

  while (1) {
    neorv32_gpio_port_set(cnt++ & 0xFF); // increment counter and mask for lowest 8 bit
    neorv32_cpu_delay_ms(250); // wait 250ms using busy wait
  }

  // this should never be reached
  return 0;
}