1 files changed, 90 insertions, 0 deletions
diff --git a/keyboards/miiiw/common/shift_register.c b/keyboards/miiiw/common/shift_register.c
new file mode 100644
index 0000000000..1f21c12468
--- /dev/null
+++ b/keyboards/miiiw/common/shift_register.c
@@ -0,0 +1,90 @@
+/* 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);
+}