main.cpp

00001 #include "mbed.h"
00002 //********************************************************
00003 //**  Nucleo-144 Stm32F746 and Stm32F767 bitbanging ******
00004 //**        Port setting and pattern generation     ******
00005 //**        Speed - Benchmark                       ******
00006 //**          Jovan Ivković - 2016.                 ******
00007 //**         JovanEps (jovan.eps@gmail.com).        ******
00008 //********************************************************
00009 
00010 DigitalOut myled(LED1);
00011 DigitalOut PD7(PF_13);
00012 DigitalOut PD5(PE_11); //introduce D5 pin-out it ping faster :)
00013 DigitalOut PD13(PA_5); //introduce D13 pin-out
00014 Serial pc(USBTX, USBRX);
00015 Timer timer;
00016 
00017 void Pinging()
00018 {
00019     int i, vreme = 0, loop_vreme=0, noop=0;
00020     while(1) {
00021         // Pattern and port setting speed benchmark
00022         timer.start();
00023         // Measure loop and value setting time for 1k runs
00024         loop_vreme = timer.read_us();
00025         for ( i = 0; i <= 999; i++ ) {
00026             noop = i; 
00027         }
00028         // -----
00029         loop_vreme = timer.read_us() - loop_vreme;
00030         timer.reset();
00031         // Measure 10 bit sequence pattern
00032         vreme = timer.read_us();
00033         for ( i = 0; i <= 999; i++ ) {
00034             PD5 = 1; // D5 go low 1 go LOW in next 69..75ns as Tf propagates signal on osciloscope
00035             PD5 = 1; // D5 go low 2
00036             PD5 = 1; // D5 go low 3
00037             PD5 = 0; // D5 go inv-high on SN74vhc14 - >1.6..2.4V < 1.75ns
00038             PD5 = 1; // D5 go low 5
00039             PD5 = 1; // D5 go low 6
00040             PD5 = 1; // D5 go low 7
00041             PD5 = 1; // D5 go low 8
00042             PD5 = 1; // D5 go low 9
00043             PD5 = 1; // D5 go low 10
00044         }
00045         vreme = timer.read_us() - vreme;
00046         wait_us(0.2);
00047         pc.printf("Port set time (single)... %6.2f ns \t tested on for: %d runs \n", ( float ) ( vreme - loop_vreme ) / 10, i * 10 ); //1000x10=10k sets of PD5 div 10 for ns
00048         pc.printf("\n %d \n\n", noop+1);
00049         timer.stop();
00050 
00051         /*  // Alternative
00052                 while(1) {
00053         PD5 = 0; // D5 go low 1
00054         PD5 = 0; // D5 go low 2
00055         PD5 = 0; // D5 go low 3
00056         PD5 = 1; // D5 go inv-low on 74vhc14 - <0.6v..0.9V < 1.6ns
00057         PD5 = 0; // D5 go low 5
00058         PD5 = 0; // D5 go low 6
00059         PD5 = 0; // D5 go low 7
00060         PD5 = 0; // D5 go low 8
00061         PD5 = 0; // D5 go low 9
00062         PD5 = 0; // D5 go low 10
00063         wait_us(0.3);
00064         */
00065         //pc.printf("\n");
00066     }
00067 }
00068 
00069 int main()
00070 {
00071     myled = 1; // LED is ON - working
00072     pc.baud(115200);
00073     //pc.baud(921600);      // Max garanted UART/seriall speed
00074     pc.printf("Starting...\n");
00075     wait(0.2); // 200 ms
00076 
00077     //NVIC_DisableIRQ(XXX); // Disable NVIC interrupt;
00078     Pinging();         //Call of Pinging methode
00079 
00080     /*
00081     while(1) {
00082       //  PD7 = 1; // D7 go high in Tr ~69..75ns
00083         //PD13 = 1; // D13 go high has delay of
00084       //  myled = 1;
00085 
00086         PD5 = 0; // D5 go high
00087         //wait(0); // 1ns - exclude, we need as fast as we can get
00088       //  PD7 = 0; // D7 go low in next 69..74ns
00089         //PD13 = 0; // D13 go high
00090       //  PD7 = 1;
00091         //PD13 = 1; // D13 go high
00092         PD5 = 0;
00093       //  PD13 = 0; // D13 go high
00094         //myled = 0;
00095         PD5 = 0; // D5 go low
00096         PD5 = 1; // D5 go inv-high on 74vhc14 - 1v
00097         PD5 = 0; // D5 go low
00098         PD5 = 1; // D5 go inv-high on 74vhc14 -2v
00099         PD5 = 0; // D5 go low 2v
00100         PD5 = 1; // D5 go inv-high on 74vhc14 - 2v
00101         PD5 = 0; // D5 go low 2v
00102         PD5 = 1; // D5 go inv-high on 74vhc14 - 3v
00103         PD5 = 0; // D5 go low 3v
00104         //v4 111010101010101 4-low lead and 6-inv-peek
00105         PD5 = 1; // D5 go inv-high on 74vhc14 - 4v
00106         PD5 = 0; // D5 go low 4v
00107         PD5 = 1; // D5 go inv-high on 74vhc14 - 4v
00108         PD5 = 0; // D5 go low 4v
00109         //wait(0);// 1nsec - exclude, we need as fast as we can get
00110 
00111         }
00112     */
00113 }