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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++) {
- setPinOutput(address_pins[i]);
- writePinLow(address_pins[i]);
- }
-
- #if defined(SN74X154_E0_PIN)
- setPinOutput(SN74X154_E0_PIN);
- writePinHigh(SN74X154_E0_PIN);
- #endif
-
- #if defined(SN74X154_E1_PIN)
- setPinOutput(SN74X154_E1_PIN);
- writePinHigh(SN74X154_E1_PIN);
- #endif
- }
-
- void sn74x154_set_enabled(bool enabled) {
- #if defined(SN74X154_E0_PIN)
- writePin(SN74X154_E0_PIN, !enabled);
- #endif
- #if defined(SN74X154_E1_PIN)
- writePin(SN74X154_E1_PIN, !enabled);
- #endif
- }
-
- void sn74x154_set_addr(uint8_t address) {
- for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
- writePin(address_pins[i], address & (1 << i));
- }
- }
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