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90 lines
2.4 KiB
90 lines
2.4 KiB
/* Copyright 2023 ArthurCyy <https://github.com/ArthurCyy>
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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 "shift_register.h"
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#include <string.h>
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static void shift_out(void);
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static uint8_t shift_values[SHR_SERIES_NUM] = {0};
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void shift_init(void) {
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#ifdef SHR_OE_PIN
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gpio_set_pin_output(SHR_OE_PIN);
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gpio_write_pin_high(SHR_OE_PIN);
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#endif
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gpio_set_pin_output(SHR_DATA_PIN);
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gpio_set_pin_output(SHR_LATCH_PIN);
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gpio_set_pin_output(SHR_CLOCK_PIN);
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}
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void shift_enable(void) {
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#ifdef SHR_OE_PIN
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gpio_write_pin_low(SHR_OE_PIN);
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#endif
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gpio_write_pin_low(SHR_DATA_PIN);
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gpio_write_pin_low(SHR_LATCH_PIN);
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gpio_write_pin_low(SHR_CLOCK_PIN);
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}
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void shift_disable(void) {
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#ifdef SHR_OE_PIN
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gpio_write_pin_high(SHR_OE_PIN);
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#endif
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gpio_write_pin_low(SHR_DATA_PIN);
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gpio_write_pin_low(SHR_LATCH_PIN);
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gpio_write_pin_low(SHR_CLOCK_PIN);
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}
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void shift_writePin(pin_t pin, int level) {
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uint8_t group = (pin - H0) >> 3;
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uint8_t bit = 0x01 << ((pin - H0)&0x07);
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if(group >= SHR_SERIES_NUM)
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return;
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if(level)
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shift_values[group] |= bit;
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else
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shift_values[group] &= ~bit;
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shift_out();
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}
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void shift_writeGroup(int group, uint8_t value) {
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if(group >= SHR_SERIES_NUM)
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return;
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shift_values[group] = value;
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shift_out();
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}
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void shift_writeAll(int level) {
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memset(shift_values, level ? 0xFF : 0, sizeof(shift_values));
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shift_out();
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}
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static void shift_out(void) {
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uint8_t n = SHR_SERIES_NUM;
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gpio_write_pin_low(SHR_LATCH_PIN);
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while(n--){
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for (uint8_t i = 0; i < 8; i++) {
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gpio_write_pin_low(SHR_CLOCK_PIN);
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gpio_write_pin(SHR_DATA_PIN, shift_values[n] & (0x80 >> i));
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gpio_write_pin_high(SHR_CLOCK_PIN);
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}
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}
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gpio_write_pin_high(SHR_LATCH_PIN);
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}
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