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56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*
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* CD74HC154_LEDs.c
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*
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* Copyright 2014 Edward V. Emelianoff <eddy@sao.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "CD74HC154_LEDs.h"
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// bits array: contains numbers of LED's bits to shine (0..6) with zero 4th bit or 0x1x for OFF
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U8 LED_bits[LEDS_AMOUNT];
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/**
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* Initialize bit array for LEDs blinking
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* @param mask - bitmap mask for LEDs: 1 - LED is ON, 0 - LED is OFF, mask &= 0x3f (6 LEDs)!
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*/
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void set_LEDs(U16 mask){
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U8 i;
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for(i = 0; i < LEDS_AMOUNT; i++, mask >>= 1)
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LED_bits[i] = (mask & 1) ? i : 0x10; // to turn all LEDs off we set !E to high level
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}
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U8 current_LED = 0;
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/**
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* Send next binary value to demultiplexer
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* we have cycle of LEDS_AMOUNT values, blink them consecutively (don't forget
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* to reduce LEDs resistor according to LEDS_AMOUNT)
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*/
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void blink_next_LED(){
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PORT(LEDS_PORT, ODR) = LED_bits[current_LED++];
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if(current_LED == LEDS_AMOUNT)
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current_LED = 0;
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}
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// turn off all LEDs
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void reset_LEDs(){
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U8 i;
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for(i = 0; i < LEDS_AMOUNT; i++)
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LED_bits[i] = 0x10;
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}
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