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machine: add USBDevice.Attach and USBDevice.Detach

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The USB device is attached to the bus automatically during startup,
before user code has a chance to finish its USB configuration (device
identifiers, extra HID interfaces, ...). Composite devices such as
keyboards may therefore be enumerated by the host with an incomplete
configuration.

Attach and Detach expose the soft-connect control (DP pull-up) so that
an application or library can detach in an init function, complete its
configuration, and attach again to let the host enumerate the finished
device. They can also be used to force re-enumeration without
replugging the cable.

Implemented for atsamd21, atsamd51, nrf52840, rp2040 and rp2350.
This commit is contained in:
sago35
2026-07-28 21:29:37 +09:00
parent 169daed2a1
commit 2a56d5e216
5 changed files with 73 additions and 0 deletions
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src/machine/machine_nrf52840_usb.go
+15
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@@ -89,6 +89,21 @@ func (dev *USBDevice) Configure(config UARTConfig) {
dev.initcomplete = true
}
// Attach connects the device to the USB bus by enabling the DP pull-up,
// allowing the host to detect and enumerate it. It can be used together with
// Detach to delay enumeration until the USB configuration (device
// identifiers, classes, ...) is complete.
func (dev *USBDevice) Attach() {
nrf.USBD.USBPULLUP.Set(1)
}
// Detach disconnects the device from the USB bus by disabling the DP pull-up.
// To the host this appears as if the device was unplugged. A subsequent
// Attach makes the host enumerate the device again.
func (dev *USBDevice) Detach() {
nrf.USBD.USBPULLUP.Set(0)
}
func handleUSBIRQ(interrupt.Interrupt) {
if nrf.USBD.EVENTS_SOF.Get() == 1 {
nrf.USBD.EVENTS_SOF.Set(0)