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package hid
import (
"errors"
"machine"
"machine/usb"
)
// from usb-hid.go
var (
ErrHIDInvalidPort = errors.New("invalid USB port")
ErrHIDInvalidCore = errors.New("invalid USB core")
ErrHIDReportTransfer = errors.New("failed to transfer HID report")
)
const (
hidEndpoint = 4
usb_SET_REPORT_TYPE = 33
usb_SET_IDLE = 10
)
type hidDevicer interface {
Handler() bool
}
var devices [5]hidDevicer
var size int
// SetHandler sets the handler. Only the first time it is called, it
// calls machine.EnableHID for USB configuration
func SetHandler(d hidDevicer) {
if size == 0 {
machine.EnableHID(handler, nil, setupHandler)
}
devices[size] = d
size++
}
func handler() {
for _, d := range devices {
if d == nil {
continue
}
if done := d.Handler(); done {
return
}
}
}
func setupHandler(setup usb.Setup) bool {
ok := false
if setup.BmRequestType == usb_SET_REPORT_TYPE && setup.BRequest == usb_SET_IDLE {
machine.SendZlp()
ok = true
}
return ok
}
// SendUSBPacket sends a HIDPacket.
func SendUSBPacket(b []byte) {
machine.SendUSBInPacket(hidEndpoint, b)
}
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