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65 lines
1.9 KiB
65 lines
1.9 KiB
/* Copyright 2022
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "sn74x138.h"
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#include "gpio.h"
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#define ADDRESS_PIN_COUNT 3
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#ifndef SN74X138_ADDRESS_PINS
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# error sn74x138: no address pins defined!
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#endif
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static const pin_t address_pins[ADDRESS_PIN_COUNT] = SN74X138_ADDRESS_PINS;
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void sn74x138_init(void) {
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for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
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gpio_set_pin_output(address_pins[i]);
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gpio_write_pin_low(address_pins[i]);
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}
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#if defined(SN74X138_E1_PIN)
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gpio_set_pin_output(SN74X138_E1_PIN);
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gpio_write_pin_high(SN74X138_E1_PIN);
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#endif
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#if defined(SN74X138_E2_PIN)
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gpio_set_pin_output(SN74X138_E2_PIN);
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gpio_write_pin_high(SN74X138_E2_PIN);
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#endif
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#if defined(SN74X138_E3_PIN)
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gpio_set_pin_output(SN74X138_E3_PIN);
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gpio_write_pin_low(SN74X138_E3_PIN);
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#endif
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}
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void sn74x138_set_enabled(bool enabled) {
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#if defined(SN74X138_E1_PIN)
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gpio_write_pin(SN74X138_E1_PIN, !enabled);
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#endif
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#if defined(SN74X138_E2_PIN)
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gpio_write_pin(SN74X138_E2_PIN, !enabled);
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#endif
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#if defined(SN74X138_E3_PIN)
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gpio_write_pin(SN74X138_E3_PIN, enabled);
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#endif
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}
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void sn74x138_set_addr(uint8_t address) {
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for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
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gpio_write_pin(address_pins[i], address & (1 << i));
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}
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}
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