66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/* 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 "sn74x138.h"
|
|
#include "gpio.h"
|
|
|
|
#define ADDRESS_PIN_COUNT 3
|
|
|
|
#ifndef SN74X138_ADDRESS_PINS
|
|
# error sn74x138: no address pins defined!
|
|
#endif
|
|
|
|
static const pin_t address_pins[ADDRESS_PIN_COUNT] = SN74X138_ADDRESS_PINS;
|
|
|
|
void sn74x138_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(SN74X138_E1_PIN)
|
|
gpio_set_pin_output(SN74X138_E1_PIN);
|
|
gpio_write_pin_high(SN74X138_E1_PIN);
|
|
#endif
|
|
|
|
#if defined(SN74X138_E2_PIN)
|
|
gpio_set_pin_output(SN74X138_E2_PIN);
|
|
gpio_write_pin_high(SN74X138_E2_PIN);
|
|
#endif
|
|
#if defined(SN74X138_E3_PIN)
|
|
gpio_set_pin_output(SN74X138_E3_PIN);
|
|
gpio_write_pin_low(SN74X138_E3_PIN);
|
|
#endif
|
|
}
|
|
|
|
void sn74x138_set_enabled(bool enabled) {
|
|
#if defined(SN74X138_E1_PIN)
|
|
gpio_write_pin(SN74X138_E1_PIN, !enabled);
|
|
#endif
|
|
#if defined(SN74X138_E2_PIN)
|
|
gpio_write_pin(SN74X138_E2_PIN, !enabled);
|
|
#endif
|
|
#if defined(SN74X138_E3_PIN)
|
|
gpio_write_pin(SN74X138_E3_PIN, enabled);
|
|
#endif
|
|
}
|
|
|
|
void sn74x138_set_addr(uint8_t address) {
|
|
for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
|
|
gpio_write_pin(address_pins[i], address & (1 << i));
|
|
}
|
|
}
|