TELINK SEMICONDUCTOR TLSR8232 - Page 154

Telink TLSR8232 BLE SDK Developer Handbook
AN-19112700-E1 153 Ver.1.0.0
same time; if previous kb_event.cnt is 1, it indicates the update is another button is
pressed with one button held; if previous kb_event.cnt is 3, it indicates the update is
one of the three pressed buttons is released……
kb_event.keycode[0] and kb_event.keycode[1] indicate key values of the two
pressed buttons currently. The subsequent keycodes are negligible.
User can manually clear the “kb_event.keycode” before each key scan, so that it can be
used to check whether valid update occurs, as shown in the example below.
In the sample code, when kb_event.keycode[0]is not zero, it’s considered a button is
pressed, but the code won’t check further whether two buttons are pressed at the same
time or one of the two pressed buttons is released.
kb_event.keycode[0] = 0; //manually clear keycode[0]
int det_key = kb_scan_key (0, 1);
if (det_key)
{
key_not_released = 1;
u8 key = kb_event.keycode[0];
if (key) //key press
{
key_buf[2] = key;
//send key press
blt_push_notify_data (HID_HANDLE_KEYBOARD_REPORT, key_buf,
8);
}
else
{
key_not_released = 0;
key_buf[2] = 0;
//send key release
blt_push_notify_data (HID_HANDLE_KEYBOARD_REPORT, key_buf,
8);
}
}