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-rw-r--r--quantum/split_common/split_util.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/quantum/split_common/split_util.c b/quantum/split_common/split_util.c
index dfd06f5f94..0850d8041f 100644
--- a/quantum/split_common/split_util.c
+++ b/quantum/split_common/split_util.c
@@ -5,6 +5,7 @@
#include "timer.h"
#include "transport.h"
#include "quantum.h"
+#include "wait.h"
#ifdef PROTOCOL_LUFA
# include <LUFA/Drivers/USB/USB.h>
@@ -79,11 +80,34 @@ static inline bool usbIsActive(void) {
static inline bool usbIsActive(void) { return true; }
#endif
+#ifdef SPLIT_HAND_MATRIX_GRID
+void matrix_io_delay(void);
+
+static uint8_t peek_matrix_intersection(pin_t out_pin, pin_t in_pin) {
+ setPinInputHigh(in_pin);
+ setPinOutput(out_pin);
+ writePinLow(out_pin);
+ // It's almost unnecessary, but wait until it's down to low, just in case.
+ wait_us(1);
+ uint8_t pin_state = readPin(in_pin);
+ // Set out_pin to a setting that is less susceptible to noise.
+ setPinInputHigh(out_pin);
+ matrix_io_delay(); // Wait for the pull-up to go HIGH.
+ return pin_state;
+}
+#endif
+
__attribute__((weak)) bool is_keyboard_left(void) {
#if defined(SPLIT_HAND_PIN)
// Test pin SPLIT_HAND_PIN for High/Low, if low it's right hand
setPinInput(SPLIT_HAND_PIN);
return readPin(SPLIT_HAND_PIN);
+#elif defined(SPLIT_HAND_MATRIX_GRID)
+# ifdef SPLIT_HAND_MATRIX_GRID_LOW_IS_RIGHT
+ return peek_matrix_intersection(SPLIT_HAND_MATRIX_GRID);
+# else
+ return !peek_matrix_intersection(SPLIT_HAND_MATRIX_GRID);
+# endif
#elif defined(EE_HANDS)
return eeconfig_read_handedness();
#elif defined(MASTER_RIGHT)