Button G Click Board

Description

This is an example of using Red Pitaya with the Red Pitaya Click Shield and Button G Click Board. If the G button is pressed on the click board, an LED is turned ON on the Red Pitaya.

Required hardware

• Red Pitaya device

• Red Pitaya Click Shield

• Button G click board

Required software

• 2.00-23 or higher OS

Note

This code is written for 2.00-23 or higher OS. For older OS versions, please check when specific commands were released (a note is added to each command introduced in 2.00 or higher verisons).

Code C

The code should be copied to the Red Pitaya using the “scp” or similar command and compiled on the board.

Note

Instructions on how to compile the code are here.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "rp.h"


// Choose a microbus depending on where the click board is
#define MIKROBUS 1

#if MIKROBUS == 1
    #define INT_PIN RP_DIO2_P    // Microbus 1
    #define PWM_PIN RP_DIO1_P
#else
    #define INT_PIN RP_DIO4_P    // Microbus 2
    #define PWM_PIN RP_DIO3_P
#endif


void pwm(int pin, int duty_cycle, float num_seconds){
    int period_us = 875;
    int num_periods = 0;
    int pulse_us = (duty_cycle * period_us) / 100;

    // configure pin as output
    rp_DpinSetDirection(pin, RP_OUT);

    while (1) {

        // check for end condition (here, 100 periods)  100
        if (num_periods == num_seconds * 1000) {
            break;
        }

        rp_DpinSetState(pin, RP_HIGH);  // Set pin state high
        usleep(pulse_us);               // Delay for pulse duration

        rp_DpinSetState(pin, RP_LOW);    // set pin state low
        usleep(period_us - pulse_us);    // delay for the remaining period

        num_periods++;                   // increment the number of periods
    }
}


int main (int argc, char **argv) {
    rp_pinState_t state;

    // Initialization of API
    if (rp_Init() != RP_OK) {
        fprintf(stderr, "Red Pitaya API init failed!\n");
        return EXIT_FAILURE;
    }

    // configure pin as input
    rp_DpinSetDirection (INT_PIN, RP_IN);

    //getting the value of the INT pin
    while(1){
        // Get button value
        rp_DpinGetState(INT_PIN, &state);
        if (state == RP_HIGH){
            // Turn the light ON/OFF based on the button value
            rp_DpinSetState(RP_LED0, state);
            //pin name, strength in power %, length of turn on
            pwm(PWM_PIN, 100, 0.1);
        }
        else{
            // Turn the light ON/OFF based on the button value
            rp_DpinSetState(RP_LED0, state);
            pwm(PWM_PIN, 0, 0.1);
        }
    }

    // Releasing resources
    rp_Release();

    return EXIT_SUCCESS;
}