asm(".macro is_key_pressed row, column");
asm("ldr r0, =(0x900E0000 + \\row )");
asm("ldrh r0, [r0]");
asm("tst r0, \\column");
asm(".endm");

//enter key
void waitKeyEnterPressed()
{
	asm("wait_key_enter_pressed:");
	asm("is_key_pressed 0x10, #0b000000000010");
	asm("bne wait_key_enter_pressed");
}

int isKeyEnterPressed()
{
	asm("is_key_pressed 0x10, #0b000000000010");
	asm("movne r0, #0x0");
	asm("moveq r0, #0x1");
}

//esc key
void waitKeyEscPressed()
{
	asm("wait_key_esc_pressed:");
	asm("is_key_pressed 0x1c, #0b000010000000");
	asm("bne wait_key_esc_pressed");
}

int isKeyEscPressed()
{
	asm("is_key_pressed 0x1c, #0b000010000000");
	asm("movne r0, #0x0");
	asm("moveq r0, #0x1");
}

//left key
void waitKeyLeftPressed()
{
	asm("wait_key_lft_pressed:");
	asm("is_key_pressed 0x1e, #0b000001000000");
	asm("bne wait_key_lft_pressed");
}

int isKeyLeftPressed()
{
	asm("is_key_pressed 0x1e, #0b000001000000");
	asm("movne r0, #0x0");
	asm("moveq r0, #0x1");
}

//right key
void waitKeyRightPressed()
{
	asm("wait_key_rght_pressed:");
	asm("is_key_pressed 0x1e, #0b000000000100");
	asm("bne wait_key_rght_pressed");
}

int isKeyRightPressed()
{
	asm("is_key_pressed 0x1e, #0b000000000100");
	asm("movne r0, #0x0");
	asm("moveq r0, #0x1");
}

//up key
void waitKeyUpPressed()
{
	asm("wait_key_up_pressed:");
	asm("is_key_pressed 0x1e, #0b000000000001");
	asm("bne wait_key_up_pressed");
}

int isKeyUpPressed()
{
	asm("is_key_pressed 0x1e, #0b000000000001");
	asm("movne r0, #0x0");
	asm("moveq r0, #0x1");
}

//down key
void waitKeyDownPressed()
{
	asm("wait_key_down_pressed:");
	asm("is_key_pressed 0x1e, #0b000000010000");
	asm("bne wait_key_down_pressed");
}

int isKeyDownPressed()
{
	asm("is_key_pressed 0x1e, #0b000000010000");
	asm("movne r0, #0x0");
	asm("moveq r0, #0x1");
}