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/* Copyright 2022
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sn74x154.h"
#include "gpio.h"
#define ADDRESS_PIN_COUNT 4
#ifndef SN74X154_ADDRESS_PINS
# error sn74x154: no address pins defined!
#endif
static const pin_t address_pins[ADDRESS_PIN_COUNT] = SN74X154_ADDRESS_PINS;
void sn74x154_init(void) {
for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
gpio_set_pin_output(address_pins[i]);
gpio_write_pin_low(address_pins[i]);
}
#if defined(SN74X154_E0_PIN)
gpio_set_pin_output(SN74X154_E0_PIN);
gpio_write_pin_high(SN74X154_E0_PIN);
#endif
#if defined(SN74X154_E1_PIN)
gpio_set_pin_output(SN74X154_E1_PIN);
gpio_write_pin_high(SN74X154_E1_PIN);
#endif
}
void sn74x154_set_enabled(bool enabled) {
#if defined(SN74X154_E0_PIN)
gpio_write_pin(SN74X154_E0_PIN, !enabled);
#endif
#if defined(SN74X154_E1_PIN)
gpio_write_pin(SN74X154_E1_PIN, !enabled);
#endif
}
void sn74x154_set_addr(uint8_t address) {
for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
gpio_write_pin(address_pins[i], address & (1 << i));
}
}
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