1 files changed, 59 insertions, 0 deletions
diff --git a/examples/host/cdc_msc_hid/src/keyboard_helper.h b/examples/host/cdc_msc_hid/src/keyboard_helper.h
new file mode 100644
index 000000000..1fde2768c
--- /dev/null
+++ b/examples/host/cdc_msc_hid/src/keyboard_helper.h
@@ -0,0 +1,59 @@
+#ifndef KEYBOARD_HELPER_H
+#define KEYBAORD_HELPER_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "tusb.h"
+
+// look up new key in previous keys
+inline bool find_key_in_report(hid_keyboard_report_t const *p_report, uint8_t keycode)
+{
+  for(uint8_t i = 0; i < 6; i++)
+  {
+    if (p_report->keycode[i] == keycode)  return true;
+  }
+
+  return false;
+}
+
+inline uint8_t keycode_to_ascii(uint8_t modifier, uint8_t keycode)
+{
+  return keycode > 128 ? 0 :
+    hid_keycode_to_ascii_tbl [keycode][modifier & (KEYBOARD_MODIFIER_LEFTSHIFT | KEYBOARD_MODIFIER_RIGHTSHIFT) ? 1 : 0];
+}
+
+void print_kbd_report(hid_keyboard_report_t *prev_report, hid_keyboard_report_t const *new_report)
+{
+
+  printf("Report: ");
+  uint8_t c;
+
+  // I assume it's possible to have up to 6 keypress events per report?
+  for (uint8_t i = 0; i < 6; i++)
+  {
+    // Check for key presses
+    if (new_report->keycode[i])
+    {
+      // If not in prev report then it is newly pressed
+      if ( !find_key_in_report(prev_report, new_report->keycode[i]) )
+        c = keycode_to_ascii(new_report->modifier, new_report->keycode[i]);
+        printf("press %c ", c);
+    }
+
+    // Check for key depresses (i.e. was present in prev report but not here)
+    if (prev_report->keycode[i])
+    {
+      // If not present in the current report then depressed
+      if (!find_key_in_report(new_report, prev_report->keycode[i]))
+      {
+        c = keycode_to_ascii(prev_report->modifier, prev_report->keycode[i]);
+        printf("depress %c ", c);
+      }
+    }
+  }
+
+  printf("\n");
+}
+
+#endif
+\ No newline at end of file