1 files changed, 21 insertions, 0 deletions
diff --git a/keyboards/handwired/d48/ds1307.c b/keyboards/handwired/d48/ds1307.c
new file mode 100644
index 0000000000..f6b57d50d2
--- /dev/null
+++ b/keyboards/handwired/d48/ds1307.c
@@ -0,0 +1,21 @@
+#include "ds1307.h"
+#include "i2c_master.h"
+
+void ds1307_set_time(uint8_t h, uint8_t m, uint8_t s) {
+    uint8_t data[] = {
+        ((s % 10) | ((s / 10) << 4)) & 0x7F,
+        ((m % 10) | ((m / 10) << 4)) & 0x7F,
+        ((h % 10) | ((h / 10) << 4)) & 0x3F,
+        0, 0, 0, 0, 0
+    }; // 24-hour mode
+    i2c_writeReg(DS1307_ADDR, 0, data, 8, 100);
+}
+
+void ds1307_get_time(uint8_t *h, uint8_t *m, uint8_t *s) {
+    uint8_t data[3];
+    i2c_readReg(DS1307_ADDR, 0, data, 3, 100);
+    i2c_stop();
+    *s = (data[0] & 0b1111) + ((data[0] & 0b1110000) >> 4) * 10;
+    *m = (data[1] & 0b1111) + ((data[1] & 0b1110000) >> 4) * 10;
+    *h = (data[2] & 0b1111) + ((data[2] & 0b0110000) >> 4) * 10;
+}