Exercises/13_4/IntroToXPS/w2: prng_example.c

#include "xparameters.h"
#include "stdio.h"
#include "sleep.h"
#include "radio_controller_basic.h"
#include "radio_controller_ext.h"
#include "radio_controller_adv.h"
#include "radio_controller_5ghz.h"
#include "EEPROM.h"
#include "warp_v4_userio.h"
#include "xgpio.h"

#define USERIO_BASEADDR XPAR_USERIO_BASEADDR
#define CAPTURE_PERIOD      XPAR_PRNG_USERIOSRC_PLBW_0_MEMMAP_CAPTUREPERIOD
#define CAPTURED_OUTPUT     XPAR_PRNG_USERIOSRC_PLBW_0_MEMMAP_CAPTUREDOUTPUT

void userio_init();
int radio_init();
void userio_example();

//Assume a 2-radio kit, with WARP Radio Boards v1.4 in slots 2 and 3
unsigned int radios = RADIO2_ADDR | RADIO3_ADDR;

int main() {

    print("\f");
    print("WARP v2 Template Project - Example Application\n");

    userio_init();
    radio_init();
    userio_example();

    return 0;
}


//Simple demonstration of the user IO on FPGA Board v2
// This function runs forever, reading the user inputs (DIP switch and push buttons)
// and updating the user outputs (hex displays and LEDs) based on the inputs
//Remember the "down" button (SW6) is tied to the PPC reset
void userio_example() {

    unsigned int assertedInputs;

    u16 capturedValue;
    u8 i,allowPrint;

        /*
         * We use allowPrint as a simple software "latch" to avoid unnecessary prints to the UART.
         * When the user presses and holds the "up" pushbutton on the board, this code will print
         * the binary string of the output of the custom core's LFSR. When the user releases the
         * pushbutton, this code will print a series of backspaces to delete the previous print.
         */
        allowPrint = 1;

        /*
         * The CAPTURE_PERIOD definition simply abstracts away the address of the "capturePeriod"
         * register that was created in the underlying custom pcore. XIo_Out32 is a simple macro
         * that Xilinx provides that lets us write values to that memory address. In this function,
         * we write a value that will ensure that the USER I/O LEDs are updated at 10 times per second.
         * Reduce this value to increase the speed of the updates and increase it to slow it down further.
         */
        XIo_Out32(CAPTURE_PERIOD,8000000-1);

        xil_printf("\t            Red LEDs  -------                 -------  Green LEDs\n");
        xil_printf("\tPRNG Captured Value:                                  ");

        /*
         * This while loop will run forever. There is no exit condition to break out of this loop.
         * This loop will continually read from the User I/O core to determine if any pushbuttons
         * are currently being pressed. If so, it triggers a small loop to print out the output
         * of the custom pcore's capturedOutput register. This inner loop is simply to display
         * the output as a binary string.
         */
        while(1){

            //Read the GPIO inputs; each 1 is a currently-asserted input bit
            assertedInputs = WarpV4_UserIO_PushB(USERIO_BASEADDR) | (WarpV4_UserIO_DipSw(USERIO_BASEADDR) << 4);

            if(assertedInputs & USERIO_MASK_PBU){
                if(allowPrint){
                    capturedValue = XIo_In32(CAPTURED_OUTPUT);
                    xil_printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
                    for (i=0;i<16;i++){
                        xil_printf("%d ", (capturedValue>>(15-i))&1);
                    }
                    allowPrint = 0;
                }
            } else if(!allowPrint) {
                xil_printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
                xil_printf("                                ");
                allowPrint = 1;
            }
        }
        xil_printf("\n");
        return;
}

void userio_init() {

    //Set all hex displays to auto-map mode
    WarpV4_UserIO_NumberMode_LeftHex(USERIO_BASEADDR);
    WarpV4_UserIO_NumberMode_MiddleHex(USERIO_BASEADDR);
    WarpV4_UserIO_NumberMode_RightHex(USERIO_BASEADDR);

    //Set all hex displays to show "0"
    WarpV4_UserIO_WriteNumber_LeftHex(USERIO_BASEADDR, 0, 0);
    WarpV4_UserIO_WriteNumber_MiddleHex(USERIO_BASEADDR, 0, 0);
    WarpV4_UserIO_WriteNumber_RightHex(USERIO_BASEADDR, 0, 0);

    //Turn off all user LEDs
    WarpV4_UserIO_Leds(USERIO_BASEADDR, 0);

}

int radio_init() {
    //Initialize the radio transceivers
    WarpRadio_v1_Reset((unsigned int*)XPAR_RADIO_CONTROLLER_0_BASEADDR, 2);

    //Set some sane defaults for the MAX2829 transceivers
    WarpRadio_v1_SetCenterFreq2GHz(11, radios);
    WarpRadio_v1_SoftwareTxGainControl(1, radios);
    WarpRadio_v1_SoftwareRxGainControl(1, radios);
    WarpRadio_v1_RxHpSoftControlEnable(radios);
    WarpRadio_v1_RxLpfCornFreqCoarseAdj(1, radios);
    WarpRadio_v1_TxLpfCornFreqCoarseAdj(1, radios);

    //Ensure both transceivers are in standby (no Tx or Rx)
    WarpRadio_v1_TxRxDisable(radios);

    return 0;
}