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-rw-r--r--sw/test-adder/test-adder.c245
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diff --git a/sw/test-adder/test-adder.c b/sw/test-adder/test-adder.c
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-/*
- * test-adder.c
- * ------------
- * This program tests the Novena EIM interface by repeatedly writing
- * two 32-bit values to the FPGA, and reading back the sum.
- *
- * Author: Pavel Shatov
- * Copyright (c) 2015, NORDUnet A/S All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - 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.
- *
- * - Neither the name of the NORDUnet 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 MERCHANTABILITY AND FITNESS FOR A
- * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-//------------------------------------------------------------------------------
-// Headers
-//------------------------------------------------------------------------------
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-
-#include "novena-eim.h"
-
-
-//------------------------------------------------------------------------------
-// Demo Adder
-//------------------------------------------------------------------------------
-#define DEMO_ADDER_BASE_ADDR (0x3210)
-#define DEMO_ADDER_REG_X (EIM_BASE_ADDR + DEMO_ADDER_BASE_ADDR + (0<<2))
-#define DEMO_ADDER_REG_Y (EIM_BASE_ADDR + DEMO_ADDER_BASE_ADDR + (1<<2))
-#define DEMO_ADDER_REG_Z (EIM_BASE_ADDR + DEMO_ADDER_BASE_ADDR + (2<<2))
-#define DEMO_ADDER_REG_SC (EIM_BASE_ADDR + DEMO_ADDER_BASE_ADDR + (3<<2))
-
-
-//------------------------------------------------------------------------------
-// Prototypes
-//------------------------------------------------------------------------------
-uint32_t demo_adder_test_round (uint32_t, uint32_t);
-uint32_t lfsr_next_x (uint32_t);
-uint32_t lfsr_next_y (uint32_t);
-
-
-//------------------------------------------------------------------------------
-// Testing Parameters
-//------------------------------------------------------------------------------
-const int NUM_TEST_ROUNDS = 10000;
-const int PRINT_XYZ_VALUES = 1;
-
-
-//------------------------------------------------------------------------------
-int main(void)
-//------------------------------------------------------------------------------
-{
- int i;
- uint32_t x = 0x12341234, y = 0xABCDABCD, zyx;
-
- // try to setup eim (return value should be 1)
- printf("Configuring EIM .. ");
- if (eim_setup() < 1) {
- printf("ERROR\n");
- return EXIT_FAILURE;
- }
- else
- printf("OK\n");
-
- // run test
- printf("Testing started.\n");
- for (i=0; i<NUM_TEST_ROUNDS; i++) {
- // run another round
- uint32_t z = demo_adder_test_round(x, y);
-
- // calculate correct answer
- zyx = x + y;
-
- // check result
- if (z != zyx) {
- printf("ERROR: round %10d of %10d: x == 0x%08X, y == 0x%08X, "
- "z == 0x%08X [z should be 0x%08X]\n",
- i+1, NUM_TEST_ROUNDS, x, y, z, zyx);
- exit(EXIT_FAILURE);
- }
- else if (PRINT_XYZ_VALUES)
- printf("OK: round %10d of %10d: x == 0x%08X, y == 0x%08X, "
- "z == 0x%08X\n", i+1, NUM_TEST_ROUNDS, x, y, z);
-
- // update input values
- x = lfsr_next_x(x);
- y = lfsr_next_x(y);
- }
-
- // ok
- printf("Testing completed successfully.\n");
-
- // done
- return EXIT_SUCCESS;
-}
-
-
-//------------------------------------------------------------------------------
-uint32_t demo_adder_test_round(uint32_t x, uint32_t y)
-//------------------------------------------------------------------------------
-{
- uint32_t ctl;
- uint32_t sts;
- uint32_t z;
-
- // write x
- eim_write_32(DEMO_ADDER_REG_X, &x);
-
- // write y
- eim_write_32(DEMO_ADDER_REG_Y, &y);
-
- /* To make adder calculate something we need to change its control
- * register, so we read it, increment and write back. Control register is
- * in the lower 16 bits.
- */
- eim_read_32(DEMO_ADDER_REG_SC, &ctl);
- ctl += 1;
- ctl &= 0x0000FFFF;
- eim_write_32(DEMO_ADDER_REG_SC, &ctl);
-
- /* When adder is done, it will write new control value into its status
- * register. Adder has 1-cycle latency which is very small, we don't even
- * need to poll, just check that status was updated. Status register is in
- * the upper 16 bits.
- */
- eim_read_32(DEMO_ADDER_REG_SC, &sts);
- sts >>= 16;
- if (sts != ctl)
- { printf("ERROR: Adder timeout!\n");
- exit(EXIT_FAILURE);
- }
-
- // read z
- eim_read_32(DEMO_ADDER_REG_Z, &z);
-
- // uncomment to trigger an error
- //z++;
-
- // done
- return z;
-}
-
-
-//------------------------------------------------------------------------------
-uint32_t lfsr_next_x(uint32_t value)
-//------------------------------------------------------------------------------
-{
- //
- // [32, 31, 29, 28, 27, 25, 24, 23, 21, 19, 17, 14, 10, 6, 4, 2]
- // 0 1 3 4 5 7 8 9 11 13 15 18 22 24 28 30
- //
-
- uint32_t carry = 0;
-
- carry ^= (value >> 0);
- carry ^= (value >> 1);
- carry ^= (value >> 3);
- carry ^= (value >> 4);
-
- carry ^= (value >> 5);
- carry ^= (value >> 7);
- carry ^= (value >> 8);
- carry ^= (value >> 9);
-
- carry ^= (value >> 11);
- carry ^= (value >> 13);
- carry ^= (value >> 15);
- carry ^= (value >> 18);
-
- carry ^= (value >> 22);
- carry ^= (value >> 24);
- carry ^= (value >> 28);
- carry ^= (value >> 30);
-
- value >>= 1, value |= (carry << 31);
-
- return value;
-}
-
-
-//------------------------------------------------------------------------------
-uint32_t lfsr_next_y(uint32_t value)
-//------------------------------------------------------------------------------
-{
- //
- // [32, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 1]
- // 0 15 16 17 18 19 20 21 22 23 24 25 26 27 28 31
- //
-
- uint32_t carry = 0;
-
- carry ^= (value >> 0);
- carry ^= (value >> 15);
- carry ^= (value >> 16);
- carry ^= (value >> 17);
-
- carry ^= (value >> 18);
- carry ^= (value >> 19);
- carry ^= (value >> 20);
- carry ^= (value >> 21);
-
- carry ^= (value >> 22);
- carry ^= (value >> 23);
- carry ^= (value >> 24);
- carry ^= (value >> 25);
-
- carry ^= (value >> 26);
- carry ^= (value >> 27);
- carry ^= (value >> 28);
- carry ^= (value >> 31);
-
- value >>= 1, value |= (carry << 31);
-
- return value;
-}
-
-
-
-//------------------------------------------------------------------------------
-// End-of-File
-//------------------------------------------------------------------------------
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