add support for keycodes to make inky-buttons usable

Author: bablokb

ports/raspberrypi/boards/pimoroni_inky_frame_5_7/pins.c

@@ -2,8 +2,41 @@
 
 #include "supervisor/board.h"
 #include "shared-module/displayio/__init__.h"
+#include "py/objtuple.h"
+#include "py/qstr.h"
+
 #include "inky-shared.h"
 
+// for use with keypad.ShiftRegisterKeys: map keycode (bit-number)
+// to logical names board.KEYCODES.SW_A etc.
+// N.B.: labels and bit-numbers in the schematic are reversed, i.e.
+//       SW_A on D0 has bit-number 7
+
+STATIC const qstr board_keycodes_fields[] = {
+    MP_QSTR_SW_A,
+    MP_QSTR_SW_B,
+    MP_QSTR_SW_C,
+    MP_QSTR_SW_D,
+    MP_QSTR_SW_E,
+    MP_QSTR_RTC_ALARM,
+    MP_QSTR_EXT_TRIGGER,
+    MP_QSTR_INKY_BUS
+};
+
+STATIC MP_DEFINE_ATTRTUPLE(
+    board_keycodes_obj,
+    board_keycodes_fields,
+    8,
+    MP_ROM_INT(7),
+    MP_ROM_INT(6),
+    MP_ROM_INT(5),
+    MP_ROM_INT(4),
+    MP_ROM_INT(3),
+    MP_ROM_INT(2),
+    MP_ROM_INT(1),
+    MP_ROM_INT(0)
+    );
+
 STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     CIRCUITPYTHON_BOARD_DICT_STANDARD_ITEMS
 
@@ -49,5 +82,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
 
     { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].epaper_display)},
     { MP_ROM_QSTR(MP_QSTR_ENABLE_DIO), MP_ROM_PTR(&enable_pin_obj)},   // GP2
+    { MP_ROM_QSTR(MP_QSTR_KEYCODES), MP_ROM_PTR(&board_keycodes_obj)},
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);