main.cpp

   1 /**
   2  * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
   3  *
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  */
   6
   7
   8 #include <stdio.h>
   9 #include "pico/stdlib.h"
  10 #include "hardware/gpio.h"
  11 #include "hardware/adc.h"
  12
  13 #include "sevseg.h"
  14 SevSeg sevseg; //Instantiate a seven segment controller object
  15
  16 #define PUMP_PIN 16
  17 #define BTN_PIN 11
  18
  19 volatile bool button_pressed = false;
  20 volatile int time_left;
  21 // Debounce control
  22 volatile unsigned long time = to_ms_since_boot(get_absolute_time());
  23 const int delayTime = 300; // Delay for every push button may vary
  24
  25 bool timer_cb(struct repeating_timer *t) {
  26         time_left--;
  27     return true;
  28 }
  29
  30 void button_cb(uint gpio, uint32_t events) {
  31     if ((to_ms_since_boot(get_absolute_time())-time)>delayTime) {
  32         time = to_ms_since_boot(get_absolute_time());
  33         printf("GPIO Interupt %d\n", gpio);
  34         button_pressed = true;
  35     }
  36 }
  37
  38 int main() {
  39     const uint LED_PIN = PICO_DEFAULT_LED_PIN;
  40     stdio_init_all();
  41     gpio_init(LED_PIN);
  42     gpio_set_dir(LED_PIN, GPIO_OUT);
  43
  44     gpio_init(PUMP_PIN);
  45     gpio_set_dir(PUMP_PIN, GPIO_OUT);
  46     gpio_put(PUMP_PIN, false);
  47
  48     adc_init();
  49     // Make sure GPIO is high-impedance, no pullups etc
  50     adc_gpio_init(26);
  51     // Select ADC input 0 (GPIO26)
  52     adc_select_input(0);
  53
  54     // 12-bit conversion, assume max value == ADC_VREF == 3.3 V
  55     const float conversion_factor = 60.0f / (1 << 12);
  56     uint16_t result;
  57
  58   byte numDigits = 2;
  59   byte digitPins[] = {9, 21};
  60   byte segmentPins[] = {2, 3, 22, 28, 27, 7, 8, 9};
  61   bool resistorsOnSegments = true; // 'false' means resistors are on digit pins
  62   byte hardwareConfig = COMMON_CATHODE; // See README.md for options
  63   bool updateWithDelays = false; // Default. Recommended
  64   bool leadingZeros = true; // Use 'true' if you'd like to keep the leading zeros
  65   sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments, updateWithDelays, leadingZeros);
  66
  67   gpio_init(BTN_PIN);
  68   gpio_pull_down(BTN_PIN);
  69   gpio_set_irq_enabled_with_callback(BTN_PIN, GPIO_IRQ_EDGE_RISE, true, &button_cb);
  70
  71   struct repeating_timer timer;
  72   bool timer_running = false;
  73
  74   while (true) {
  75     gpio_put(LED_PIN, true);
  76     if (button_pressed && !timer_running) {
  77         add_repeating_timer_ms(-1000 * 60, timer_cb, NULL, &timer);
  78         gpio_put(PUMP_PIN, true);
  79         timer_running = true;
  80         button_pressed= false;
  81     }
  82     else if (button_pressed && timer_running) {
  83         cancel_repeating_timer(&timer);
  84         gpio_put(PUMP_PIN, false);
  85         timer_running = false;
  86         button_pressed = false;
  87     }
  88     if (timer_running && time_left <= 0) {
  89         cancel_repeating_timer(&timer);
  90         timer_running = false;
  91         gpio_put(PUMP_PIN, false);
  92     }
  93     if (!timer_running) {
  94         result = adc_read();
  95         time_left = (int)(result * conversion_factor) + 1;
  96     }
  97     sevseg.setNumber(time_left, 0);
  98     sevseg.refreshDisplay(); // Must run repeatedly
  99     gpio_put(LED_PIN, false);
 100   }
 101 }