add hid_keycode_to_ascii_tbl for hid class

improve keyboard_app, should display all displayable characters
improve the de-bouncing keyboard (still got some issues)

tinyusb/class/hid.h

@@ -77,6 +77,7 @@ enum {
 typedef ATTR_PREPACKED struct ATTR_PACKED {
   uint8_t  bLength;         /**< Numeric expression that is the total size of the HID descriptor */
   uint8_t  bDescriptorType; /**< Constant name specifying type of HID descriptor. */
+
   uint16_t bcdHID;          /**< Numeric expression identifying the HID Class Specification release */
   uint8_t  bCountryCode;    /**< Numeric expression identifying country code of the localized hardware.  */
   uint8_t  bNumDescriptors; /**< Numeric expression specifying the number of class descriptors */
@@ -132,15 +133,101 @@ enum {
 	KEYBOARD_MODIFIER_RIGHTGUI   = BIT_(7)
 };
 
-enum
-{
-  KEYBOARD_KEYCODE_a = 0x04,
-  KEYBOARD_KEYCODE_z = 0x1d,
+#define HID_KEYCODE_TABLE(ENTRY) \
+    ENTRY( 0x04, 'a', 'A' )\
+    ENTRY( 0x05, 'b', 'B' )\
+    ENTRY( 0x06, 'c', 'C' )\
+    ENTRY( 0x07, 'd', 'D' )\
+    ENTRY( 0x08, 'e', 'E' )\
+    ENTRY( 0x09, 'f', 'F' )\
+    ENTRY( 0x0a, 'g', 'G' )\
+    ENTRY( 0x0b, 'h', 'H' )\
+    ENTRY( 0x0c, 'i', 'I' )\
+    ENTRY( 0x0d, 'j', 'J' )\
+    ENTRY( 0x0e, 'k', 'K' )\
+    ENTRY( 0x0f, 'l', 'L' )\
+    \
+    ENTRY( 0x10, 'm', 'M' )\
+    ENTRY( 0x11, 'n', 'N' )\
+    ENTRY( 0x12, 'o', 'O' )\
+    ENTRY( 0x13, 'p', 'P' )\
+    ENTRY( 0x14, 'q', 'Q' )\
+    ENTRY( 0x15, 'r', 'R' )\
+    ENTRY( 0x16, 's', 'S' )\
+    ENTRY( 0x17, 't', 'T' )\
+    ENTRY( 0x18, 'u', 'U' )\
+    ENTRY( 0x19, 'v', 'V' )\
+    ENTRY( 0x1a, 'w', 'W' )\
+    ENTRY( 0x1b, 'x', 'X' )\
+    ENTRY( 0x1c, 'y', 'Y' )\
+    ENTRY( 0x1d, 'z', 'Z' )\
+    ENTRY( 0x1e, '1', '!' )\
+    ENTRY( 0x1f, '2', '@' )\
+    \
+    ENTRY( 0x20, '3', '#' )\
+    ENTRY( 0x21, '4', '$' )\
+    ENTRY( 0x22, '5', '%' )\
+    ENTRY( 0x23, '6', '^' )\
+    ENTRY( 0x24, '7', '&' )\
+    ENTRY( 0x25, '8', '*' )\
+    ENTRY( 0x26, '9', '(' )\
+    ENTRY( 0x27, '0', ')' )\
+    ENTRY( 0x28, '\r', '\r' )\
+    ENTRY( 0x29, '\e', '\e' )\
+    ENTRY( 0x2a, '\b', '\b' )\
+    ENTRY( 0x2b, '\t', '\t' )\
+    ENTRY( 0x2c, ' ', ' '  )\
+    ENTRY( 0x2d, '-', '_' )\
+    ENTRY( 0x2e, '=', '+' )\
+    ENTRY( 0x2f, '[', '{' )\
+    \
+    ENTRY( 0x30, ']', '}' )\
+    ENTRY( 0x31, '\\', '|' )\
+    ENTRY( 0x32, '#', '~' ) /* TODO non-US keyboard */ \
+    ENTRY( 0x33, ';', ':' )\
+    ENTRY( 0x34, '\'', '\"' )\
+    ENTRY( 0x35, 0, 0 )\
+    ENTRY( 0x36, ',', '<' )\
+    ENTRY( 0x37, '.', '>' )\
+    ENTRY( 0x38, '/', '?' )\
+    ENTRY( 0x39, 0, 0 ) /* TODO CapsLock, non-locking key implementation*/ \
+    \
+    ENTRY( 0x54, '/', '/' )\
+    ENTRY( 0x55, '*', '*' )\
+    ENTRY( 0x56, '-', '-' )\
+    ENTRY( 0x57, '+', '+' )\
+    ENTRY( 0x58, '\r', '\r' )\
+    ENTRY( 0x59, '1', 0 ) /* numpad1 & end */ \
+    ENTRY( 0x5a, '2', 0 )\
+    ENTRY( 0x5b, '3', 0 )\
+    ENTRY( 0x5c, '4', 0 )\
+    ENTRY( 0x5d, '5', '5' )\
+    ENTRY( 0x5e, '6', 0 )\
+    ENTRY( 0x5f, '7', 0 )\
+    ENTRY( 0x60, '8', 0 )\
+    ENTRY( 0x61, '9', 0 )\
+    ENTRY( 0x62, '0', 0 )\
+    ENTRY( 0x63, '0', 0 )\
+    \
+    ENTRY( 0x67, '=', '=' )\
 
-  KEYBOARD_KEYCODE_1 = 0x1e,
-  KEYBOARD_KEYCODE_0 = 0x27
-  // TODO complete keycode table
-};
+// TODO HID complete keycode table
+
+//enum
+//{
+//  KEYBOARD_KEYCODE_A     = 0x04,
+//  KEYBOARD_KEYCODE_Z     = 0x1d,
+//
+//  KEYBOARD_KEYCODE_1     = 0x1e,
+//  KEYBOARD_KEYCODE_0     = 0x27,
+//
+//  KEYBOARD_KEYCODE_ENTER = 0x28,
+//  KEYBOARD_KEYCODE_ESCAPE = 0x29,
+//  KEYBOARD_KEYCODE_BACKSPACE = 0x2a,
+//  KEYBOARD_KEYCODE_TAB = 0x2b,
+//  KEYBOARD_KEYCODE_SPACEBAR = 0x2c,
+//
+//};
 
 /**
  * \brief Local Country code for HID

tinyusb/class/hid_host.c

@@ -111,6 +111,16 @@ tusb_error_t hidh_interface_get_report(uint8_t dev_addr, uint8_t * const report,
 //--------------------------------------------------------------------+
 #if TUSB_CFG_HOST_HID_KEYBOARD
 
+#define EXPAND_KEYCODE_TO_ASCII(keycode, ascii, shift_modified)  \
+  [0][keycode] = ascii,\
+  [1][keycode] = shift_modified,\
+
+// TODO size of table should be a macro for application to check boundary
+uint8_t const hid_keycode_to_ascii_tbl[2][128] =
+{
+    HID_KEYCODE_TABLE(EXPAND_KEYCODE_TO_ASCII)
+};
+
 STATIC_ hidh_interface_info_t keyboard_data[TUSB_CFG_HOST_DEVICE_MAX]; // does not have addr0, index = dev_address-1
 
 //------------- KEYBOARD PUBLIC API (parameter validation required) -------------//

tinyusb/class/hid_host.h

@@ -65,6 +65,9 @@
 bool          tusbh_hid_keyboard_is_supported(uint8_t dev_addr) ATTR_PURE ATTR_WARN_UNUSED_RESULT;
 tusb_error_t  tusbh_hid_keyboard_get_report(uint8_t dev_addr, uint8_t instance_num, uint8_t * const report) ATTR_WARN_UNUSED_RESULT;
 tusb_interface_status_t tusbh_hid_keyboard_status(uint8_t dev_addr, uint8_t instance_num) ATTR_WARN_UNUSED_RESULT;
+
+uint8_t const hid_keycode_to_ascii_tbl[2][128]; // TODO used weak attr if build failed without KEYBOARD enabled
+
 //------------- Application Callback -------------//
 void tusbh_hid_keyboard_isr(uint8_t dev_addr, uint8_t instance_num, tusb_event_t event) ATTR_WEAK;