1 files changed, 53 insertions, 0 deletions
diff --git a/users/csc027/csc027.c b/users/csc027/csc027.c
new file mode 100644
index 000000000..de1bad6f2
--- /dev/null
+++ b/users/csc027/csc027.c
@@ -0,0 +1,53 @@
+#include "csc027.h"
+
+// Declare the strings in PROGMEM using the convenience macro
+CUSTOM_MACROS(CUSTOM_DEF, CUSTOM_MACRO_STRING, SEMI_DELIM);
+
+static const char* const custom_macros[] PROGMEM = {
+    // Declare the pointer to the strings in PROGMEM
+    CUSTOM_MACROS(CUSTOM_VAR, DROP, COMMA_DELIM)
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch(keycode) {
+        case LOWER:
+            if(record->event.pressed) {
+                layer_on(_LW);
+            } else {
+                layer_off(_LW);
+            }
+            update_tri_layer(_LW, _RS, _MS);
+            return false;
+        case RAISE:
+            if(record->event.pressed) {
+                layer_on(_RS);
+            } else {
+                layer_off(_RS);
+            }
+            update_tri_layer(_LW, _RS, _MS);
+            return false;
+        case (MC_first + 1)...(MC_last - 1):
+            if(record->event.pressed) {
+                send_string_P(
+#if defined(__AVR__)
+                    // The accessor here first reads from the pointer array that is located
+                    // in PROGMEM.  The pointer is taken and passed to the send_string_P
+                    // function, which is aware of the difference between RAM and PROGMEM
+                    // pointers.
+                    (char*)pgm_read_word(&custom_macros[keycode - MC_first - 1])
+#else
+                    // For non-AVR MCUs, the PROGMEM macro is defined as nothing.  So, the strings are
+                    // declared in RAM instead of flash.  The send_string_P function, when compiled for
+                    // non-AVR targets, uses a different definition of pgm_read_byte internally.  This
+                    // definition uses RAM pointers instead.  This is why the raw pointer is passed for
+                    // non-AVR MCUs.
+                    custom_macros[keycode - MC_first - 1]
+#endif
+                );
+                return true;
+            }
+            return false;
+        default:
+            return true;
+    }
+}