Linux kernel 如何使用FF_常量进行Linux的力反馈?
我不能利用力效应。我的试用码是:Linux kernel 如何使用FF_常量进行Linux的力反馈?,linux-kernel,joystick,input-devices,Linux Kernel,Joystick,Input Devices,我不能利用力效应。我的试用码是: struct ff_effect joy_effect_, joy_effect_2; if (iwantconstantforce) { joy_effect_.id = -1; joy_effect_.type = FF_CONSTANT; joy_effect_.direction = 0x0000; // down joy_effect_.replay.length = 100; jo
struct ff_effect joy_effect_, joy_effect_2;
if (iwantconstantforce)
{
joy_effect_.id = -1;
joy_effect_.type = FF_CONSTANT;
joy_effect_.direction = 0x0000; // down
joy_effect_.replay.length = 100;
joy_effect_.replay.delay = 0;
joy_effect_.trigger.button = 0;
joy_effect_.trigger.interval = 100;
joy_effect_.u.constant.level = 65535;
joy_effect_.u.constant.envelope.attack_length = joy_effect_.replay.length / 10;
joy_effect_.u.constant.envelope.fade_length = joy_effect_.replay.length / 10;
joy_effect_.u.constant.envelope.attack_level = joy_effect_.u.constant.level / 10;
joy_effect_.u.constant.envelope.fade_level = joy_effect_.u.constant.level / 10;
}
我能够用以下代码生成FF_弹簧和FF_阻尼器效果
if (youwantdampereffect)
{
joy_effect_.id = -1;
joy_effect_.direction = 0; // down
joy_effect_.type = FF_DAMPER;
joy_effect_.replay.length = 20;
joy_effect_.replay.delay = 0;
joy_effect_.u.condition[0].right_saturation = 65535;
joy_effect_.u.condition[0].left_saturation = 65535;
joy_effect_.u.condition[0].right_coeff = 65535 / 2;
joy_effect_.u.condition[0].left_coeff = 65535 / 2;
joy_effect_.u.condition[0].deadband = 0;
joy_effect_.u.condition[0].center = 0;
int ret = ioctl(ff_fd_, EVIOCSFF, &joy_effect_); // upload the effect
}
if (youwantspringeffect)
{
joy_effect_2.id = -1;
joy_effect_2.direction = 0; // down
joy_effect_2.type = FF_SPRING;
joy_effect_2.replay.length = 20;
joy_effect_2.replay.delay = 0;
joy_effect_2.u.condition[0].right_saturation = 65535 / 2;
joy_effect_2.u.condition[0].left_saturation = 65535 / 2;
joy_effect_2.u.condition[0].right_coeff = 32767;
joy_effect_2.u.condition[0].left_coeff = 32767;
joy_effect_2.u.condition[0].deadband = 0;
joy_effect_2.u.condition[0].center = 0;
int ret = ioctl(ff_fd_, EVIOCSFF, &joy_effect_2); // upload the effect
}
我找不到任何关于恒力效应感觉如何或何时使用它有意义的信息。
有人能简要介绍一下它的重要性和用法吗
谢谢:)我不熟悉操纵杆,因为它可以与其他设备一起使用。首先,我看不到
ioctl
调用内部if(iwantcontforce)
您是在此处发布问题时错过了它,还是忘了将其添加到程序中?另外,我发现了一个链接,您可以检查FF_CONSTAN是如何使用的,并在您的代码中尝试一下。希望这能有所帮助)谢谢@NickS。很有可能我忘记了在代码中调用ioctl
,我必须再检查一遍。感谢您如此仔细地阅读我的代码。很快,我将再次开始工作。如果问题解决了,我会在这里发布。我不熟悉操纵杆,因为它可以与其他设备一起工作。首先,我看不到ioctl
调用内部if(iwantcontforce)
您是在此处发布问题时错过了它,还是忘了将其添加到程序中?另外,我发现了一个链接,您可以检查FF_CONSTAN是如何使用的,并在您的代码中尝试一下。希望这能有所帮助)谢谢@NickS。很有可能我忘记了在代码中调用ioctl
,我必须再检查一遍。感谢您如此仔细地阅读我的代码。很快,我将再次开始工作。如果问题解决了,我会在这里发布。