lcd_pager.comp

/********************************************************************************
lcd_pager.comp

*********************************************************************************/

component lcd_pager                 "This component services the LCD Page turner";

pin in bit page_up_in              "bump page up";
pin in bit page_dn_in             "bump page down";
pin in signed enc_count             "Optional Encoder Input";
pin in unsigned number_pages           "number of pages to turn, total";
pin out unsigned page_out                "output to LCD page";

function _;
author "Travis Farmer";
license "GPL";
;;

bool last_up = false;
bool last_dn = false;
int curr_page = 0;
int lastCntr = 0;

void bump_up(unsigned int Pages) {
    curr_page++;
    if (curr_page > Pages) {
        curr_page = 0;
    }
}

void bump_dn(unsigned int Pages) {
    curr_page--;
    if (curr_page < 0) {
        curr_page = Pages;
    }
}

FUNCTION(_) {
    unsigned int num_pages = (number_pages-1);
    if (page_up_in == 1 && last_up == false) {
        last_up = true;
    } else if (page_up_in == 0 && last_up == true) {
        last_up = false;
        curr_page++;
        if (curr_page > num_pages) {
            curr_page = 0;
            bump_up(num_pages);
        }
    } else if (page_dn_in == 1 && last_dn == false) {
        last_dn = true;
    } else if (page_dn_in == 0 && last_dn == true) {
        last_dn = false;
        bump_dn(num_pages);
    }
    if (enc_count > lastCntr) {
        lastCntr = enc_count;
        bump_up(num_pages);
    } else if (enc_count < lastCntr) {
        lastCntr = enc_count;
        bump_dn(num_pages);
    }
    page_out = curr_page;
}