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Fix abrupt USB disconnection leaving stale data in DAP queue buffers. #1090

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Fix abrupt USB disconnection leaving stale data in DAP queue buffers. #1090

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2 changes: 1 addition & 1 deletion source/board/microbitv2/kl27z/power.c
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Original file line number Diff line number Diff line change
Expand Up @@ -106,7 +106,7 @@ void PORTCD_IRQHandler(void)
USBD_Reset();
usbd_reset_core();
usb_pc_connected = false;
usb_state = USB_DISCONNECTED;
usb_state = USB_DISCONNECTING;
}
else {
// Cable inserted
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4 changes: 2 additions & 2 deletions source/board/microbitv2/nrf52820/power.c
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Original file line number Diff line number Diff line change
Expand Up @@ -247,7 +247,7 @@ void GPIOTE_IRQHandler(void)
USBD_Reset();
usbd_reset_core();
usb_pc_connected = false;
usb_state = USB_DISCONNECTED;
usb_state = USB_DISCONNECTING;
} else {
// Cable inserted
wake_from_usb = 1;
Expand All @@ -272,7 +272,7 @@ void POWER_CLOCK_IRQHandler(void)
USBD_Reset();
usbd_reset_core();
usb_pc_connected = false;
usb_state = USB_DISCONNECTED;
usb_state = USB_DISCONNECTING;
}
}
#endif // POWER_IRQ_USBDETECTED
14 changes: 11 additions & 3 deletions source/daplink/interface/main_interface.c
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Expand Up @@ -401,9 +401,13 @@ void main_task(void * arg)
switch (usb_state) {
case USB_DISCONNECTING:
usb_state = USB_DISCONNECTED;
// Disable board power before USB is disconnected.
// Disable target power as USB was disconnected.
gpio_set_board_power(false);
usbd_connect(0);
// Clear the DAP queue buffers
#if (USBD_HID_ENABLE)
usbd_bulk_init();
usbd_hid_init();
#endif
break;

case USB_CONNECTING:
Expand Down Expand Up @@ -435,12 +439,16 @@ void main_task(void * arg)
break;

case USB_CONNECTED:
if (!usbd_configured()) {
usb_state = USB_DISCONNECTING;
}
break;

case USB_DISCONNECTED:
if (usbd_configured()) {
usb_state = USB_CONNECTED;
}
else {
usb_state = USB_DISCONNECTED;
usb_state_count = USB_CONNECT_DELAY;
usb_no_config_count = USB_CONFIGURE_TIMEOUT;
}
Expand Down