Subversion Repositories neo430

// #################################################################################################

// #  < Test the multiplier/divider unit >                                                         #

// # ********************************************************************************************* #

// # 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.                                                                                #

// #                                                                                               #

// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS   #

// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF               #

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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,     #

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// # ********************************************************************************************* #

// # The NEO430 Processor - https://github.com/stnolting/neo430                                    #

// #################################################################################################

// Libraries

#include <stdint.h>

#include <neo430.h>

// Configuration

#define BAUD_RATE 19200

/* ------------------------------------------------------------

 * INFO Main function

 * ------------------------------------------------------------ */

int main(void) {

  // setup UART

  neo430_uart_setup(BAUD_RATE);

  neo430_printf("Multiplier/Divider Test\n\n");

  // check if multiplier/divider unit was synthesized, exit if not

  if (!(SYS_FEATURES & (1<<SYS_MULDIV_EN))) {

    neo430_uart_br_print("Error! No multiplier/divider unit synthesized!");

    return 1;

  }

  uint32_t prod, prod_ref;

  int32_t sprod, sprod_ref;

  uint16_t i, a, b, rem, quot, rem_ref, quot_ref;

  int16_t sa, sb, srem, squot, srem_ref, squot_ref;

  for (i=0; i<0xFFFF; i++) {

    // get "random" operands

    a = (uint16_t)neo430_xorshift32();

    b = (uint16_t)neo430_xorshift32();

    // multiply test

    prod_ref = (uint32_t)a * (uint32_t)b;

    prod = neo430_umul32(a, b);

    neo430_printf("UNSIGNED %u: %u * %u  =  P: %n  vs ref.  P: %n\n", i, a, b, prod, prod_ref);

    // division test

    if (b == 0) // dont divide by zero

      b = 1;

    quot_ref = a / b;

    rem_ref  = a % b;

    quot = neo430_umoddiv16(&rem, a, b);

    neo430_printf("UNSIGNED %u: %u / %u  =  Q: %u & R: %u  vs ref.  Q: %u & R: %u\n", i, a, b, quot, rem, quot_ref, rem_ref);

    // get "random" operands

    sa = (int16_t)neo430_xorshift32();

    sb = (int16_t)neo430_xorshift32();

    // division test - signed

    if (sb == 0) // dont divide by zero

      sb = 1;

    squot_ref = sa / sb;

    srem_ref  = sa % sb;

    squot = neo430_moddiv16(&srem, sa, sb);

    neo430_printf("SIGNED   %u: %i / %i  =  Q: %i & R: %i  vs ref.  Q: %i & R: %i\n", i, sa, sb, squot, srem, squot_ref, srem_ref);

    // multiply test - signed

    sprod_ref = (int32_t)sa * (int32_t)sb;

    sprod = neo430_mul32(sa, sb);

    neo430_printf("SIGNED   %u: %i * %i  =  P: %l  vs ref.  P: %l\n", i, sa, sb, sprod, sprod_ref);

    // all correct?

    if ((rem != rem_ref) || (quot != quot_ref) || (prod != prod_ref) || (srem != srem_ref) || (squot != squot_ref) || (sprod != sprod_ref)) {

      neo430_printf("ERROR in one or more of the four previous operations!");

      while(1);

    }

  }

  neo430_printf("Tests passed!\n");

  while(1);

  return 0;

}