BootKeyboard

[ktchiam]

Hi,

I'm trying to use Boot Keyboard to send ALT + B keystroke to access BIOS during startup. It seems that the CPU receives SHIFT + ALT + B instead.
Is there anyway I can further check on this?

My code:

#include "HID-Project.h"

const int pinLed = LED_BUILTIN;
const int pinBios = 2;
const int pinPW = 3;

void setup() {
  pinMode(pinLed, OUTPUT);
  pinMode(pinBios, INPUT_PULLUP);
  pinMode(pinPW, INPUT_PULLUP);

  // Sends a clean report to the host. This is important on any Arduino type.
  BootKeyboard.begin();
}


void loop() {
/*  // Light led if keyboard uses the boot protocol (normally while in bios)

  if (BootKeyboard.getProtocol() == HID_BOOT_PROTOCOL)
    digitalWrite(pinLed, HIGH);
  else
    digitalWrite(pinLed, LOW);

*/
  // Trigger ALT B to enter bios
  if (!digitalRead(pinBios)) {
    digitalWrite(pinLed, HIGH);
    BootKeyboard.press(KEY_LEFT_ALT);
    BootKeyboard.press('B');
    delay(100); 
    digitalWrite(pinLed, LOW);
    
    // Simple debounce
    delay(300);
  }

  // Enter bios password
  if (!digitalRead(pinPW)) {
    digitalWrite(pinLed, HIGH);
    BootKeyboard.println("password"); 
    digitalWrite(pinLed, LOW);
    
    // Simple debounce
    delay(300);
  }
}

[NicoHood]

How do you think it receives a shift signal?

You are only pressing the keys, but never releasing them. That might be also an issue.

[ktchiam]

Hi Nico, Thanks for the reply. I have found the issue to be using capital letter B. In order to have the capital letter, shift button is also pressed. My problem resolved after I change to KEY_B. Yes, you also pointed out a mistake I made. Thank you again. Best regards KT Chiam

…

On Thu, 3 Jun 2021 at 16:56, NicoHood ***@***.***> wrote: How do you think it receives a shift signal? You are only pressing the keys, but never releasing them. That might be also an issue. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#290 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AO2IRX2IXD4ANAQDALBTFSTTQ47VJANCNFSM4555EAGQ> .

-- Best Regards, KT Chiam

[NicoHood]

Nice! Very cool it was so easy to solve. I also did not see the B vs b.