public async Task AssignPin(string pin)
{
using (var writer = new StreamWriter(GpioPath.ExportPath(pin), false))
{
await writer.WriteAsync(pin);
}
}
public bool Read(string pin)
{
using (
var reader =
new StreamReader(new FileStream(GpioPath.ValuePath(pin), FileMode.Open, FileAccess.Read,
FileShare.ReadWrite)))
{
var rawValue = reader.ReadToEnd();
return(rawValue.StartsWith("1"));
}
}
public int SetupInterrupt(string pin)
{
var pollFd = Syscall.epoll_create(1);
var valueFd = Syscall.open(GpioPath.ValuePath(pin), OpenFlags.O_NONBLOCK | OpenFlags.O_RDONLY);
if (
Syscall.epoll_ctl(pollFd, EpollOp.EPOLL_CTL_ADD, valueFd,
EpollEvents.EPOLLIN | EpollEvents.EPOLLET | EpollEvents.EPOLLPRI) != 0)
{
throw new Exception("Error creating interupt");
}
return(pollFd);
}
public async Task SetDirection(string pin, GpioDirection direction)
{
string direct;
switch (direction)
{
case GpioDirection.In:
direct = "in";
break;
case GpioDirection.Out:
direct = "out";
break;
case GpioDirection.Low:
direct = "low";
break;
case GpioDirection.High:
direct = "high";
break;
default:
throw new ArgumentException("Requires a direction");
}
try
{
using (var writer = new StreamWriter(GpioPath.DirectionPath(pin), false))
{
await writer.WriteAsync(direct);
return;
}
}
catch (UnauthorizedAccessException)
{
// User is not root and the permissions have not been set yet. Need to wait.
Thread.Sleep(TimeSpan.FromSeconds(0.5));
}
using (var writer = new StreamWriter(GpioPath.DirectionPath(pin), false))
{
await writer.WriteAsync(direct);
}
}
public async Task SetEdge(string pin, GpioEdge edge)
{
string edgeValue;
switch (edge)
{
case GpioEdge.None:
edgeValue = "none";
break;
case GpioEdge.Both:
edgeValue = "both";
break;
case GpioEdge.Rising:
edgeValue = "rising";
break;
case GpioEdge.Falling:
edgeValue = "falling";
break;
default:
throw new ArgumentException("Requires a direction");
}
try
{
using (var writer = new StreamWriter(GpioPath.EdgePath(pin), false))
{
await writer.WriteAsync(edgeValue);
return;
}
}
catch (UnauthorizedAccessException)
{
// User is not root and the permissions have not been set yet. Need to wait.
Thread.Sleep(TimeSpan.FromSeconds(0.5));
}
using (var writer = new StreamWriter(GpioPath.EdgePath(pin), false))
await writer.WriteAsync(edgeValue);
}
public void Write(string pin, bool value)
{
using (var writer = new StreamWriter(GpioPath.ValuePath(pin), false))
writer.Write(value ? "1" : "0");
}
public async Task WriteAsync(string pin, bool value)
{
using (var writer = new StreamWriter(GpioPath.ValuePath(pin), false))
await writer.WriteAsync(value? "1" : "0");
}
