main.cpp

00001 /*****************************************************************************
00002 * Copyright (c) 2019 Analog Devices, Inc.  
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00027 * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES, INC. AND CONTRIBUTORS "AS IS" 
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00041 * 20180927-7CBSD SLA
00042 *****************************************************************************/
00043 
00044 /* 
00045 The SDP connector is a 120 pin connector used on Analog Devices controller 
00046 boards to interface with ADI evaluation boards, over 450 ADI evaluation boards 
00047 utilise this connector, a list of these boards can be found at 
00048 https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-development-platforms/sdp.html#Compatible-Boards.
00049 
00050 The following is an example program showing how to initialise and use SDP 
00051 connector peripherals (using SPI and GPIOs as an example) on the SDP-K1 in mbed.
00052 Informtion on the pin name definitions for the SDP connector on the SDP-K1 can 
00053 be found at https://os.mbed.com/platforms/SDP_K1/.
00054 The full list of peripherals available on the SDP connector include GPIOs, 
00055 Timers, SPI, I2C, and UART. For further information on how to enable these 
00056 peripherals, consult the mbed documentation https://os.mbed.com/docs/mbed-os/v5.15/apis/drivers.html
00057 */
00058 #include "mbed.h"
00059 #include "platform/mbed_thread.h"
00060 #include <bitset>
00061 #include "FibonacciLFSR.h"
00062 #include "FastPWM.h"
00063 
00064 // Initialise the serial object with TX and RX pins
00065 Serial pc(USBTX, USBRX);
00066 
00067 // Initialise the digital pin 5 as a fast PWM output, prescaler set to 1
00068 FastPWM fastpwm(D5,1);
00069  
00070  // Initialise LFSR random
00071 FibonacciLFSR lfsr(FibonacciLFSR::LFSR_8);
00072       
00073 // main() runs in its own thread in the OS
00074 int main()
00075 {   
00076     uint16_t lfsr_rand1, lfsr_rand2, lfsr_rand3;
00077     int lfsr_rand_test;
00078     uint32_t rando = rand();
00079     
00080     std::bitset<32> rand_bitset(rando);
00081     
00082     //pc.printf("System Core Clock: %d\r\n", SystemCoreClock);  
00083     //pc.printf("Random Number: %d\r\n", rando); 
00084        
00085     while(true){
00086         
00087         //fastpwm.period_ticks(4); // fast PWM allows period to be set in ticks of SystemCoreClock. 4 ticks = 45MHz on SDP-K1
00088         //fastpwm.pulsewidth_ticks(2); // duty cycle 50%
00089         
00090         fastpwm.period_ticks(18); // fast PWM allows period to be set in ticks of SystemCoreClock. 4 ticks = 45MHz on SDP-K1
00091         //fastpwm.pulsewidth_ticks(9);
00092         // cycle pulse width randomly
00093         for (int i = 0; i < 32; ++i) {
00094             if (rand_bitset.test(i))             
00095                 fastpwm.pulsewidth_ticks(9);           
00096             else
00097                  fastpwm.pulsewidth_ticks(0);           
00098         }       
00099     }
00100 }
00101