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zero_gravi |
// #################################################################################################
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// # < TRNG test program > #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEO430 Processor - https://github.com/stnolting/neo430 #
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// #################################################################################################
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// Libraries
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#include <stdint.h>
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#include <neo430.h>
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// Configuration
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#define BAUD_RATE 19200
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#define NUM_SAMPLES 2000000000
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#define TRNG_TAP_MASK 0b01010001000000 // highly experimental!
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// Global variables
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uint32_t rnd_hist[256];
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/* ------------------------------------------------------------
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* INFO Main function
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* ------------------------------------------------------------ */
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int main(void) {
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// setup UART
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neo430_uart_setup(BAUD_RATE);
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// intro text
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neo430_printf("\n<<< TRNG Test >>>\n");
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// check if TRNG was synthesized, exit if not available
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if (!(SYS_FEATURES & (1<<SYS_TRNG_EN))) {
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neo430_printf("Error! No TRNG synthesized!");
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return 1;
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}
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// reset & start TRNG
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uint8_t rnd_data = 0;
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uint16_t rnd_status = 0;
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neo430_trng_enable(TRNG_TAP_MASK);
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// make sure TRNG is running
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int k;
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for(k=0; k<1024; k++){
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rnd_status = neo430_trng_get(&rnd_data);
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if (rnd_status) {
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neo430_trng_disable();
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neo430_cpu_delay(100);
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neo430_trng_enable(TRNG_TAP_MASK); // reset TRNG
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}
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else {
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break;
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}
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if (k == 1000) {
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neo430_printf("\nTRNG calibration error!\n");
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return 0;
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}
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}
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while(1) {
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// main menu
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neo430_printf("\nCommands:\n"
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" a: Print random numbers (abort by pressing any key)\n"
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" b: Generate random data histogram (%n samples)\n"
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" x: Return to bootloader\n", (uint32_t)NUM_SAMPLES);
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neo430_printf("CMD:> ");
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char cmd = neo430_uart_getc();
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neo430_uart_putc(cmd); // echo
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neo430_printf("\n");
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// output RND data
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if (cmd == 'a') {
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uint32_t num_samples = 0;
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while(1) {
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rnd_status = neo430_trng_get(&rnd_data);
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if (rnd_status) {
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neo430_printf("\nTRNG error!\n");
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break;
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}
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neo430_printf("%u ", (uint16_t)rnd_data);
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num_samples++;
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if (neo430_uart_char_received()) { // abort when key pressed
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neo430_printf("\nNumber of samples: %n\n", num_samples);
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break;
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}
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}
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}
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// compute histogram
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else if (cmd == 'b') {
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// clear histogram memory
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uint16_t i;
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for (i=0; i<256; i++) {
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rnd_hist[i] = 0;
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}
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// generate histogram
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neo430_printf("Sampling data (%n samples). This may take some time...\n", (uint32_t)NUM_SAMPLES);
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uint32_t j;
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for (j=0; j<NUM_SAMPLES; j++) {
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rnd_status = neo430_trng_get(&rnd_data);
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if (rnd_status
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) {
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neo430_printf("\nTRNG error!\n");
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break;
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}
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rnd_hist[rnd_data]++;
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}
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// output results
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neo430_printf("rnd_hist:\n");
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for(i=0; i<256; i++) {
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neo430_printf("%u =%n\n", i, rnd_hist[i]);
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}
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}
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// exit
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else if (cmd == 'x') {
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if (!(SYS_FEATURES & (1<<SYS_BTLD_EN)))
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neo430_printf("No bootloader installed!\n");
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else
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asm volatile ("mov #0xF000, r0");
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}
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else {
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neo430_printf("Invalid option.\n");
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}
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}
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return 0;
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}
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