/** * Copyright (c) 2024 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */ #include <stdio.h> // Include sys/types.h before inttypes.h to work around issue with // certain versions of GCC and newlib which causes omission of PRIx64 #include <sys/types.h> #include <inttypes.h> #include "pico/stdlib.h" #include "pico/rand.h" // How many random numbers to generate #define RANDOM_COUNT 500000 // Percentage that the min and max count must be from the mean #define RANDOM_PERCENT_MIN 98 #define RANDOM_PERCENT_MAX 101 int main() { stdio_init_all(); // Generate some random numbers. It will seed itself uint32_t r32 = get_rand_32(); uint64_t r64 = get_rand_64(); rng_128_t r128; get_rand_128(&r128); // Display the random numbers printf("Random 32bits %08"PRIx32"\n", r32); printf("Random 64bits %016"PRIx64"\n", r64); printf("Random 128bits %016"PRIx64"%016"PRIx64"\n", r128.r[0], r128.r[1]); // Lets check they appear to be a bit random printf("Generating %d random numbers\n", RANDOM_COUNT); uint32_t count[32] = {0}; for (int run = 0; run < RANDOM_COUNT; run++) { count[get_rand_32() % count_of(count)]++; } // Display count uint32_t biggest = 0; uint32_t smallest = 0xFFFFFFFF; for (uint num = 0; num < count_of(count); num++) { printf("count of %d: %u\n", num, count[num]); if (count[num] > biggest) biggest = count[num]; if (count[num] < smallest) smallest = count[num]; // Check the distribution int check = ((RANDOM_COUNT / count_of(count)) * 100) / count[num]; hard_assert(check >= RANDOM_PERCENT_MIN && check <= RANDOM_PERCENT_MAX); } printf("Biggest count: %u\n", biggest); printf("Smallest count: %u\n", smallest); printf("All done\n"); return 0; }

This firmware image was imported from the pico-examples repository. 


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