Make Swap Hands use PROGMEM (#12284)

This converts the array that the Swap Hands feature uses to use PROGMEM,
and to read from that array, as such. Since this array never changes at
runtime, there is no reason to keep it in memory. Especially for AVR
boards, as memory is a precious resource.

2 files changed, 3 insertions, 2 deletions

diff --git a/tmk_core/common/action.c b/tmk_core/common/action.c
index aae5cbfa5..f41665b06 100644
--- a/tmk_core/common/action.c
+++ b/tmk_core/common/action.c
@@ -133,7 +133,8 @@ void process_hand_swap(keyevent_t *event) {
     bool             do_swap = event->pressed ? swap_hands : swap_state[pos.row] & (col_bit);
 
     if (do_swap) {
-        event->key = hand_swap_config[pos.row][pos.col];
+        event->key.row = pgm_read_byte(&hand_swap_config[pos.row][pos.col].row);
+        event->key.col = pgm_read_byte(&hand_swap_config[pos.row][pos.col].col);
         swap_state[pos.row] |= col_bit;
     } else {
         swap_state[pos.row] &= ~(col_bit);
diff --git a/tmk_core/common/action.h b/tmk_core/common/action.h
index 9a991de1c..6c8456178 100644
--- a/tmk_core/common/action.h
+++ b/tmk_core/common/action.h
@@ -78,7 +78,7 @@ extern bool disable_action_cache;
 /* Code for handling one-handed key modifiers. */
 #ifdef SWAP_HANDS_ENABLE
 extern bool           swap_hands;
-extern const keypos_t hand_swap_config[MATRIX_ROWS][MATRIX_COLS];
+extern const keypos_t PROGMEM hand_swap_config[MATRIX_ROWS][MATRIX_COLS];
 #    if (MATRIX_COLS <= 8)
 typedef uint8_t swap_state_row_t;
 #    elif (MATRIX_COLS <= 16)