Testsuite for render time measurement on MDx devices

tests/platform/MDx_display_benchmark.c

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+/***************************************************************************
+ *   Copyright (C) 2021 by Federico Amedeo Izzo IU2NUO,                    *
+ *                         Niccolò Izzo IU2KIN                             *
+ *                         Frederik Saraci IU2NRO                          *
+ *                         Silvano Seva IU2KWO                             *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 3 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>   *
+ ***************************************************************************/
+
+#include <interfaces/graphics.h>
+#include <interfaces/platform.h>
+#include <interfaces/keyboard.h>
+#include <hwconfig.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <os.h>
+
+uint64_t benchmark(uint32_t n);
+
+int main()
+{
+    platform_init();
+    platform_setBacklightLevel(255);
+
+    gfx_init();
+    kbd_init();
+
+    /*
+     * Setup timer for time measurement: input clock is twice the APB2 clock, so
+     * is 168MHz. Setting the prescaler to 33 we get a tick frequency of
+     * 5,09090909091 MHz, that is a resolution of 0.196 us per tick.
+     * Considering that the timer has a 16-bit counter, we have rollover in
+     * 12.87 ms.
+     */
+
+    static const uint32_t clkDivider = 33;
+
+    RCC->APB2ENR |= RCC_APB2ENR_TIM9EN;
+
+    TIM9->PSC = clkDivider - 1;
+    TIM9->ARR = 0xFFFF;
+    TIM9->CR1 = TIM_CR1_CEN;
+
+    uint32_t numIterations = 128;
+
+    while(1)
+    {
+        getchar();
+
+        uint64_t tot_ticks = benchmark(numIterations);
+
+        float totalTime_s = ((float)(tot_ticks * clkDivider))/168000000.0f;
+        printf("Average values over %ld iterations:\r\n", numIterations);
+        printf("- %lld ticks\r\n- %f ms\r\n", tot_ticks, totalTime_s*1000.0f);
+
+    }
+}
+
+uint64_t benchmark(uint32_t n)
+{
+    uint64_t totalTime = 0;
+    uint32_t dummy = 0;
+
+    for(uint32_t i = 0; i < n; i++)
+    {
+        gfx_clearScreen();
+        point_t origin = {0, i % 128};
+        color_t color_red = {255, 0, 0, 255};
+        color_t color_white = {255, 255, 255, 255};
+        gfx_drawRect(origin, 160, 20, color_red, 1);
+        char *buffer = "KEK";
+        gfx_print(origin, buffer, FONT_SIZE_24PT, TEXT_ALIGN_LEFT,color_white);
+
+        dummy += kbd_getKeys();
+
+        /* Measure the time taken by gfx_render() */
+        TIM9->CNT = 0;
+        gfx_render();
+        totalTime += TIM9->CNT;
+    }
+
+    return totalTime/n;
+}