70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
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/*
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Copyright 2014 Kai Ryu <kai1103@gmail.com>
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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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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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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 "fantastic.h"
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void shift_register_init(void)
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{
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SR_DDR |= (1<<SR_CLK_BIT | 1<<SR_DATA_BIT | 1<<SR_LATCH_BIT);
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SR_PORT &= ~(1<<SR_CLK_BIT | 1<<SR_DATA_BIT | 1<<SR_LATCH_BIT);
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}
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void shift_register_write_byte(uint8_t byte)
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{
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uint8_t i = 7;
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do {
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shift_register_data((byte >> i) & 1);
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shift_register_clk();
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} while (i--);
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shift_register_latch();
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}
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void shift_register_write_word(uint16_t word)
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{
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uint8_t i = 15;
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do {
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shift_register_data((word >> i) & 1);
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shift_register_clk();
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} while (i--);
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shift_register_latch();
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}
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inline
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void shift_register_clk(void)
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{
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SR_PORT |= (1<<SR_CLK_BIT);
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SR_PORT &= ~(1<<SR_CLK_BIT);
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}
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inline
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void shift_register_data(uint8_t bit)
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{
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if (bit) {
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SR_PORT |= (1<<SR_DATA_BIT);
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}
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else {
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SR_PORT &= ~(1<<SR_DATA_BIT);
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}
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}
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inline
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void shift_register_latch(void)
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{
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SR_PORT &= ~(1<<SR_LATCH_BIT);
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SR_PORT |= (1<<SR_LATCH_BIT);
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}
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