Projet_SETI_RISC-V/fibonacci/main.c

// #################################################################################################
// # << NEORV32 - "Hello World" Demo Program >>                                                    #
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// # Copyright (c) 2022, Stephan Nolting. All rights reserved.                                     #
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/**********************************************************************//**
 * @file hello_world/main.c
 * @author Stephan Nolting
 * @brief Classic 'hello world' demo program.
 **************************************************************************/

#include <neorv32.h>


/**********************************************************************//**
 * @name User configuration
 **************************************************************************/
/**@{*/
/** UART BAUD rate */
#define BAUD_RATE 19200
/**@}*/

void fibonnaci(uint32_t *n_max, uint32_t *f_n){
  uint32_t max = *n_max;
  uint32_t fn_1 = 0;
  uint32_t fn_copy = 1;
  uint32_t fn_test = 1;

  for(uint32_t i=0; i<max; i++){
    fn_copy = fn_test;
    fn_test = fn_test + fn_1;
    fn_1 = fn_copy;
  }

  *f_n = fn_test;
}


/**********************************************************************//**
 * Main function; prints some fancy stuff via UART.
 *
 * @note This program requires the UART interface to be synthesized.
 *
 * @return 0 if execution was successful
 **************************************************************************/
int main() {
  long Begin_Time, End_Time, User_Time;
  uint32_t n_max, f;
  // capture all exceptions and give debug info via UART
  // this is not required, but keeps us safe
  neorv32_rte_setup();

  // init UART at default baud rate, no parity bits, no HW flow control
  neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);

  // check available hardware extensions and compare with compiler flags
  neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch

  // say hello
  neorv32_uart0_puts("Fibonnacci cycles measure :\n");
  neorv32_uart0_printf("NEORV32: Freq = %u\n",NEORV32_SYSINFO.CLK);

  for(uint8_t i=1; i<10; i++){
    n_max = 50*i;
    Begin_Time = (long)neorv32_mtime_get_time();

    for(uint32_t j=0; j<10; j++){
      fibonnaci(&n_max, &f);

    }
    End_Time = (long)neorv32_mtime_get_time();
    User_Time = End_Time - Begin_Time;
    neorv32_uart0_printf("y last : %d \n", f);
    neorv32_uart0_printf("NEORV32: mean cycles n_max = %u :      %u\n",n_max, (uint32_t)User_Time/10);
  }
  neorv32_uart0_puts("end:\n");
  return 0;
}