Alex Andrews / Mbed OS SDP_K1_Rand

Generated a random signal out of SDPK1 PWM header 5

Dependencies:   FibonacciLFSR FastPWM

main.cpp@0:8c77f47060aa, 2021-01-25 (annotated)

Committer:
aandrews
Date:
Mon Jan 25 16:13:37 2021 +0000
Revision:
0:8c77f47060aa
test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aandrews 0:8c77f47060aa 1 /*****************************************************************************
aandrews 0:8c77f47060aa 2 * Copyright (c) 2019 Analog Devices, Inc.
aandrews 0:8c77f47060aa 3 *
aandrews 0:8c77f47060aa 4 * All rights reserved.
aandrews 0:8c77f47060aa 5 *
aandrews 0:8c77f47060aa 6 * Redistribution and use in source and binary forms, with or without
aandrews 0:8c77f47060aa 7 * modification, are permitted provided that the following conditions are met:
aandrews 0:8c77f47060aa 8 * - Redistributions of source code must retain the above copyright notice,
aandrews 0:8c77f47060aa 9 * this list of conditions and the following disclaimer.
aandrews 0:8c77f47060aa 10 * - Redistributions in binary form must reproduce the above copyright notice,
aandrews 0:8c77f47060aa 11 * this list of conditions and the following disclaimer in the documentation
aandrews 0:8c77f47060aa 12 * and/or other materials provided with the distribution.
aandrews 0:8c77f47060aa 13 * - Modified versions of the software must be conspicuously marked as such.
aandrews 0:8c77f47060aa 14 * - This software is licensed solely and exclusively for use with
aandrews 0:8c77f47060aa 15 * processors/products manufactured by or for Analog Devices, Inc.
aandrews 0:8c77f47060aa 16 * - This software may not be combined or merged with other code in any manner
aandrews 0:8c77f47060aa 17 * that would cause the software to become subject to terms and
aandrews 0:8c77f47060aa 18 * conditions which differ from those listed here.
aandrews 0:8c77f47060aa 19 * - Neither the name of Analog Devices, Inc. nor the names of its
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aandrews 0:8c77f47060aa 22 * - The use of this software may or may not infringe the patent rights
aandrews 0:8c77f47060aa 23 * of one or more patent holders. This license does not release you from
aandrews 0:8c77f47060aa 24 * the requirement that you obtain separate licenses from these patent
aandrews 0:8c77f47060aa 25 * holders to use this software.
aandrews 0:8c77f47060aa 26 *
aandrews 0:8c77f47060aa 27 * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES, INC. AND CONTRIBUTORS "AS IS"
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aandrews 0:8c77f47060aa 33 * (INCLUDING, BUT NOT LIMITED TO, DAMAGES ARISING OUT OF CLAIMS OF
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aandrews 0:8c77f47060aa 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
aandrews 0:8c77f47060aa 37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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aandrews 0:8c77f47060aa 39 * POSSIBILITY OF SUCH DAMAGE.
aandrews 0:8c77f47060aa 40 *
aandrews 0:8c77f47060aa 41 * 20180927-7CBSD SLA
aandrews 0:8c77f47060aa 42 *****************************************************************************/
aandrews 0:8c77f47060aa 43
aandrews 0:8c77f47060aa 44 /*
aandrews 0:8c77f47060aa 45 The SDP connector is a 120 pin connector used on Analog Devices controller
aandrews 0:8c77f47060aa 46 boards to interface with ADI evaluation boards, over 450 ADI evaluation boards
aandrews 0:8c77f47060aa 47 utilise this connector, a list of these boards can be found at
aandrews 0:8c77f47060aa 48 https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-development-platforms/sdp.html#Compatible-Boards.
aandrews 0:8c77f47060aa 49
aandrews 0:8c77f47060aa 50 The following is an example program showing how to initialise and use SDP
aandrews 0:8c77f47060aa 51 connector peripherals (using SPI and GPIOs as an example) on the SDP-K1 in mbed.
aandrews 0:8c77f47060aa 52 Informtion on the pin name definitions for the SDP connector on the SDP-K1 can
aandrews 0:8c77f47060aa 53 be found at https://os.mbed.com/platforms/SDP_K1/.
aandrews 0:8c77f47060aa 54 The full list of peripherals available on the SDP connector include GPIOs,
aandrews 0:8c77f47060aa 55 Timers, SPI, I2C, and UART. For further information on how to enable these
aandrews 0:8c77f47060aa 56 peripherals, consult the mbed documentation https://os.mbed.com/docs/mbed-os/v5.15/apis/drivers.html
aandrews 0:8c77f47060aa 57 */
aandrews 0:8c77f47060aa 58 #include "mbed.h"
aandrews 0:8c77f47060aa 59 #include "platform/mbed_thread.h"
aandrews 0:8c77f47060aa 60 #include <bitset>
aandrews 0:8c77f47060aa 61 #include "FibonacciLFSR.h"
aandrews 0:8c77f47060aa 62 #include "FastPWM.h"
aandrews 0:8c77f47060aa 63
aandrews 0:8c77f47060aa 64 // Initialise the serial object with TX and RX pins
aandrews 0:8c77f47060aa 65 Serial pc(USBTX, USBRX);
aandrews 0:8c77f47060aa 66
aandrews 0:8c77f47060aa 67 // Initialise the digital pin 5 as a fast PWM output, prescaler set to 1
aandrews 0:8c77f47060aa 68 FastPWM fastpwm(D5,1);
aandrews 0:8c77f47060aa 69
aandrews 0:8c77f47060aa 70 // Initialise LFSR random
aandrews 0:8c77f47060aa 71 FibonacciLFSR lfsr(FibonacciLFSR::LFSR_8);
aandrews 0:8c77f47060aa 72
aandrews 0:8c77f47060aa 73 // main() runs in its own thread in the OS
aandrews 0:8c77f47060aa 74 int main()
aandrews 0:8c77f47060aa 75 {
aandrews 0:8c77f47060aa 76 uint16_t lfsr_rand1, lfsr_rand2, lfsr_rand3;
aandrews 0:8c77f47060aa 77 int lfsr_rand_test;
aandrews 0:8c77f47060aa 78 uint32_t rando = rand();
aandrews 0:8c77f47060aa 79
aandrews 0:8c77f47060aa 80 std::bitset<32> rand_bitset(rando);
aandrews 0:8c77f47060aa 81
aandrews 0:8c77f47060aa 82 //pc.printf("System Core Clock: %d\r\n", SystemCoreClock);
aandrews 0:8c77f47060aa 83 //pc.printf("Random Number: %d\r\n", rando);
aandrews 0:8c77f47060aa 84
aandrews 0:8c77f47060aa 85 while(true){
aandrews 0:8c77f47060aa 86
aandrews 0:8c77f47060aa 87 //fastpwm.period_ticks(4); // fast PWM allows period to be set in ticks of SystemCoreClock. 4 ticks = 45MHz on SDP-K1
aandrews 0:8c77f47060aa 88 //fastpwm.pulsewidth_ticks(2); // duty cycle 50%
aandrews 0:8c77f47060aa 89
aandrews 0:8c77f47060aa 90 fastpwm.period_ticks(18); // fast PWM allows period to be set in ticks of SystemCoreClock. 4 ticks = 45MHz on SDP-K1
aandrews 0:8c77f47060aa 91 //fastpwm.pulsewidth_ticks(9);
aandrews 0:8c77f47060aa 92 // cycle pulse width randomly
aandrews 0:8c77f47060aa 93 for (int i = 0; i < 32; ++i) {
aandrews 0:8c77f47060aa 94 if (rand_bitset.test(i))
aandrews 0:8c77f47060aa 95 fastpwm.pulsewidth_ticks(9);
aandrews 0:8c77f47060aa 96 else
aandrews 0:8c77f47060aa 97 fastpwm.pulsewidth_ticks(0);
aandrews 0:8c77f47060aa 98 }
aandrews 0:8c77f47060aa 99 }
aandrews 0:8c77f47060aa 100 }
aandrews 0:8c77f47060aa 101