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[/] [neorv32/] [trunk/] [sw/] [example/] [demo_trng/] [main.c] - Rev 13
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// ################################################################################################# // # << NEORV32 - TRNG Demo Program >> # // # ********************************************************************************************* # // # 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 # // # 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. # // # ********************************************************************************************* # // # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting # // ################################################################################################# /**********************************************************************//** * @file demo_trng/main.c * @author Stephan Nolting * @brief TRNG demo program. **************************************************************************/ #include <neorv32.h> /**********************************************************************//** * @name User configuration **************************************************************************/ /**@{*/ /** UART BAUD rate */ #define BAUD_RATE 19200 /**@}*/ /**********************************************************************//** * This program generates a simple dimming sequence for PWM channel 0,1,2. * * @note This program requires the UART and the TRNG to be synthesized. * * @return Irrelevant. **************************************************************************/ int main(void) { uint8_t lucky_numbers_5of50[5]; uint8_t lucky_numbers_2of10[2]; uint8_t i, j, tmp; uint16_t trng_data; unsigned int num_samples; // check if UART unit is implemented at all if (neorv32_uart_available() == 0) { return 0; } // capture all exceptions and give debug info via UART // this is not required, but keeps us safe neorv32_rte_enable_debug_mode(); // init UART at default baud rate, no rx interrupt, no tx interrupt neorv32_uart_setup(BAUD_RATE, 0, 0); // intro neorv32_uart_printf("\n--- TRNG Demo ---\n\n"); // check if TRNG unit is implemented at all if (neorv32_trng_available() == 0) { neorv32_uart_printf("No TRNG implemented."); return 0; } // configure TRNG with defaul GARO tap mask neorv32_uart_printf("Configuring TRNG...\n"); uint16_t trng_tap_config = neorv32_trng_find_tap_mask(); neorv32_uart_printf("TRNG: Using tap mask: 0x%x ", (uint32_t)trng_tap_config); neorv32_trng_setup(trng_tap_config); while(1) { // main menu neorv32_uart_printf("\nCommands:\n" " n: Print 8-bit random numbers (abort by pressing any key)\n" " l: Print your lucky numbers\n"); neorv32_uart_printf("CMD:> "); char cmd = neorv32_uart_getc(); neorv32_uart_putc(cmd); // echo neorv32_uart_printf("\n"); // output RND data if (cmd == 'n') { num_samples = 0; while(1) { if (neorv32_trng_get(&trng_data)) { neorv32_uart_printf("\nTRNG error!\n"); break; } neorv32_uart_printf("%u ", (uint32_t)(trng_data & 0xFF)); num_samples++; if (neorv32_uart_char_received()) { // abort when key pressed neorv32_uart_printf("\nPrinted samples: %u", num_samples); break; } } } // print lucky numbers if (cmd == 'l') { // reset array for (i=0; i<5; i++) { lucky_numbers_5of50[i] = 0; } lucky_numbers_2of10[0] = 0; lucky_numbers_2of10[1] = 0; // get numbers i = 0; while (i<5) { if (neorv32_trng_get(&trng_data)) { neorv32_uart_printf("\nTRNG error!\n"); break; } // valid range? tmp = (uint8_t)(trng_data & 0xff); if ((tmp == 0) || (tmp > 50)) { continue; } // already sampled? for (j=0; j<5; j++) { if (lucky_numbers_5of50[j] == tmp) { continue; } } lucky_numbers_5of50[i] = tmp; i++; } // get numbers part 2 i = 0; while (i<2) { if (neorv32_trng_get(&trng_data)) { neorv32_uart_printf("\nTRNG error!\n"); break; } // valid range? tmp = (uint8_t)(trng_data & 0xff); if ((tmp == 0) || (tmp > 10)) { continue; } // already sampled? for (j=0; j<2; j++) { if (lucky_numbers_2of10[j] == tmp) { continue; } } lucky_numbers_2of10[i] = tmp; i++; } // output neorv32_uart_printf("\n"); for (j=0; j<5; j++) { if (i==4) { neorv32_uart_printf("%u", (uint32_t)lucky_numbers_5of50[j]); } else { neorv32_uart_printf("%u, ", (uint32_t)lucky_numbers_5of50[j]); } } neorv32_uart_printf("\nLucky numbers: %u, %u\n", (uint32_t)lucky_numbers_2of10[0], (uint32_t)lucky_numbers_2of10[1]); } } return 0; }
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