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10 years, 10 months ago.
Send UP_ARROW with USB Keyboard
Hello
I try to find the right way to sent the arrow key with the USB Keyboard. When I send the arrow command with 0.01s space on Metal Slug 3 the character move sometime, I think that the game see sometime the arrow key. If I send the key as fast as possible, the game freeze until i stop to press the arrow key
have you an idea? I use the KL25z board .
thank you
Sorry for my english I am french.
1 Answer
10 years, 10 months ago.
Are you sure the issue is your code, and not the game? Sending a command 100 times per second is just slightly outside the normal range. 10 times per second is already not humanly possible.
I fond the solution. The USB Keyboard send automatically the press and release command:
the original function in USBKeyboard.cpp
bool USBKeyboard::keyCode(uint8_t key, uint8_t modifier) {
// Send a simulated keyboard keypress. Returns true if successful.
HID_REPORT report;
report.data[0] = REPORT_ID_KEYBOARD;
report.data[1] = modifier;
report.data[2] = 0;
report.data[3] = keymap[key].usage;
report.data[4] = 0;
report.data[5] = 0;
report.data[6] = 0;
report.data[7] = 0;
report.data[8] = 0;
report.length = 9;
if (!send(&report)) {
return false;
}
report.data[1] = 0;
report.data[3] = 0;
if (!send(&report)) {
return false;
}
return true;
}
So the second send(&report)
stop key code
if (!send(&report)) {
return false;
}
Stop automatically the command sent before. Just comment this code and add a new function to send manually the release event
stop key code final in USBKeyboard.cpp
bool USBKeyboard::keyCode(uint8_t key, uint8_t modifier) {
// Send a simulated keyboard keypress. Returns true if successful.
HID_REPORT report;
report.data[0] = REPORT_ID_KEYBOARD;
report.data[1] = modifier;
report.data[2] = 0;
report.data[3] = keymap[key].usage;
report.data[4] = 0;
report.data[5] = 0;
report.data[6] = 0;
report.data[7] = 0;
report.data[8] = 0;
report.length = 9;
if (!send(&report)) {
return false;
}
report.data[1] = 0;
report.data[3] = 0;
/*if (!send(&report)) {
return false;
}*/
return true;
}
bool USBKeyboard::keyCode_off() {
// Send a simulated keyboard keypress. Returns true if successful.
HID_REPORT report;
report.data[0] = REPORT_ID_KEYBOARD;
report.data[1] = 0;
report.data[2] = 0;
report.data[3] = 0;
report.data[4] = 0;
report.data[5] = 0;
report.data[6] = 0;
report.data[7] = 0;
report.data[8] = 0;
report.length = 9;
if (!send(&report)) {
return false;
}
return true;
}
The main code is
stop key code final in main.cpp
#include "mbed.h"
#include "USBKeyboard.h"
//LED1: NUM_LOCK
//LED2: CAPS_LOCK
//LED3: SCROLL_LOCK
BusOut leds(LED2, LED2, LED3);
DigitalOut led(LED1);
DigitalIn Up(PTC12);
DigitalIn Down(PTC13);
DigitalIn Left(PTC16);
DigitalIn Right(PTC17);
DigitalIn Right(PTC17);
DigitalIn Right(PTC17);
DigitalIn Right(PTC17);
DigitalIn Right(PTC17);
//USBKeyboard
USBKeyboard keyboard;
int main(void) {
int verou1 = 0;
int verou2 = 0;
int verou3 = 0;
int verou4 = 0;
Up.mode(PullUp);
Down.mode(PullUp);
Left.mode(PullUp);
Right.mode(PullUp);
while (1) {
if(Up==0)
{
verou1 = 0;
keyboard.keyCode(UP_ARROW, 0);
}
else if(verou1 == 0)
{
led =! led;
verou1 = 1;
keyboard.keyCode_off();
}
if(Down==0)
{
verou2 = 0;
keyboard._putc(DOWN_ARROW);
}
else if(verou2 == 0)
{
verou2 = 1;
keyboard.keyCode(0, 0);
}
if(Left==0)
{
verou3 = 0;
keyboard._putc(LEFT_ARROW);
}
else if(verou3 == 0)
{
verou3 = 1;
keyboard.keyCode_off();
}
if(Right==0)
{
verou4 = 0;
keyboard._putc(RIGHT_ARROW);
}
else if(verou4 == 0)
{
verou4 = 1;
keyboard.keyCode(0, 0);
}
wait(0.05);
//leds = keyboard.lockStatus();
}
}
the "verou" variable is use to avoid a continuous stop commend if my stick arcade is not used. Use "keyboard._putc()" or "keyboard.keyCode()" in this case do the same thing.
PS:
If you want to send several key at the same time use this function:
send several key at the same time : USBKeyboard.cpp
bool USBKeyboard::keyCode_ATH(uint8_t key_1, uint8_t key_2, uint8_t key_3, uint8_t key_4, uint8_t key_5, uint8_t key_6, uint8_t modifier) {
// Send a simulated keyboard keypress. Returns true if successful.
HID_REPORT report;
report.data[0] = REPORT_ID_KEYBOARD;
report.data[1] = modifier;
report.data[2] = 0;
report.data[3] = keymap[key_1].usage;
report.data[4] = keymap[key_2].usage;
report.data[5] = keymap[key_3].usage;
report.data[6] = keymap[key_4].usage;
report.data[7] = keymap[key_5].usage;
report.data[8] = keymap[key_6].usage;
report.length = 9;
if (!send(&report)) {
return false;
}
return true;
}