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