[SOLVED] Problem using interrupt pin change with a joystick

Projects Programming
5

I've looked into the sleep modes and from what I understood the analog comparator would need to be in IDLE mode, which is the least efficient.

So I replaced the PCI by a Watchdog Timer Interrupt that wake the IC every 125ms. It is also useful to receive data from the nrf24l01 without using the IRQ pin.

I cannot test the current consumption for the moment, but the timer behave as expected. I used MCUSR &= ~(1<<WDRF); from an example of the datasheet, but I have seen it set to 0 in others.

#define WDPS_16MS   (0<<WDP3 )|(0<<WDP2 )|(0<<WDP1)|(0<<WDP0)
#define WDPS_32MS   (0<<WDP3 )|(0<<WDP2 )|(0<<WDP1)|(1<<WDP0)
#define WDPS_64MS   (0<<WDP3 )|(0<<WDP2 )|(1<<WDP1)|(0<<WDP0)
#define WDPS_125MS  (0<<WDP3 )|(0<<WDP2 )|(1<<WDP1)|(1<<WDP0)
#define WDPS_250MS  (0<<WDP3 )|(1<<WDP2 )|(0<<WDP1)|(0<<WDP0)
#define WDPS_500MS  (0<<WDP3 )|(1<<WDP2 )|(0<<WDP1)|(1<<WDP0)
#define WDPS_1S     (0<<WDP3 )|(1<<WDP2 )|(1<<WDP1)|(0<<WDP0)
#define WDPS_2S     (0<<WDP3 )|(1<<WDP2 )|(1<<WDP1)|(1<<WDP0)
#define WDPS_4S     (1<<WDP3 )|(0<<WDP2 )|(0<<WDP1)|(0<<WDP0)
#define WDPS_8S     (1<<WDP3 )|(0<<WDP2 )|(0<<WDP1)|(1<<WDP0)

#define CLIENT_ADDRESS 1
#define SERVER_ADDRESS 2

#include <avr/sleep.h>
#include <RHReliableDatagram.h>
#include <RH_NRF24.h>
#include <SPI.h>

RH_NRF24 driver;
RHReliableDatagram manager(driver, CLIENT_ADDRESS);

const byte XPIN = A1;
const byte YPIN = A2;
const byte ZPIN = A3;
const byte RFLED = 7;
const byte IRLED = 6;

ISR (WDT_vect) { sleep_disable(); }

void setup () 
{
    pinMode(XPIN, INPUT);
    pinMode(YPIN, INPUT);
    pinMode(ZPIN, INPUT);
    pinMode(RFLED, OUTPUT);
    digitalWrite(RFLED, LOW);
    manager.init(); //nrf24

    MCUSR &= ~(1<<WDRF); //Clear Watchdog System Reset Flag (WDRF) in MCU Status Register (MCUSR)
    WDTCSR = (1<<WDCE)|(1<<WDE); //Set WD Change Enable (WDCE) and WD Enable (WDE) in WD Timer Control Register (WDTCSR) (enter configuration mode)
    WDTCSR = (1<<WDIE)|WDPS_125MS; //Set WD Interrupt Enable (WDIE) and WD Pause
}

void loop ()
{
    set_sleep_mode (SLEEP_MODE_PWR_DOWN);
    sleep_mode ();
    rf_listen();
    read_input();
}

void read_input()
{
    if (digitalRead(ZPIN) == 0) { rf_sendString("Click"); }
    else if (analogRead(YPIN) > 700) { rf_sendString("Up"); }
    else if (analogRead(YPIN) < 400) { rf_sendString("Down"); }
    else if (analogRead(XPIN) > 700) { rf_sendString("Left"); }
    else if (analogRead(XPIN) < 400) {  rf_sendString("Right"); }
}

void rf_sendString(char str[RH_NRF24_MAX_MESSAGE_LEN])
{
    digitalWrite(RFLED, HIGH);
    uint8_t rf_data[RH_NRF24_MAX_MESSAGE_LEN];
    strcpy((char*)rf_data, str); 
    manager.sendtoWait(rf_data, sizeof(rf_data), SERVER_ADDRESS);
    digitalWrite(RFLED, LOW); 
}

void rf_listen()
{
    if (manager.available())
    {
        uint8_t rf_buf[RH_NRF24_MAX_MESSAGE_LEN];
        uint8_t len = sizeof(rf_buf);
        uint8_t from;
        if (manager.recvfromAck(rf_buf, &len, &from))
        {
            if (!strcmp((char*)rf_buf, "tv"))
            {
                //Blink IR LED
            }
        }
    }
}