Add Teensy 4.1 power pin and fix SWD for DEBUG=1

Author: tannewt

ports/mimxrt10xx/boards/teensy41/pins.c

@@ -142,6 +142,11 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_D54), MP_ROM_PTR(&pin_GPIO_EMC_29) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_QSPI_IO3), MP_ROM_PTR(&pin_GPIO_EMC_29) },
 
+    // USB Host
+    { MP_ROM_QSTR(MP_QSTR_USB_HOST_POWER), MP_ROM_PTR(&pin_GPIO_EMC_40) },
+    { MP_ROM_QSTR(MP_QSTR_USB_HOST_DP), MP_ROM_PTR(&pin_USB_OTG2_DP) },
+    { MP_ROM_QSTR(MP_QSTR_USB_HOST_DM), MP_ROM_PTR(&pin_USB_OTG2_DN) },
+
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },

ports/mimxrt10xx/supervisor/port.c

@@ -408,7 +408,11 @@ void port_idle_until_interrupt(void) {
     common_hal_mcu_disable_interrupts();
     if (!background_callback_pending()) {
         NVIC_ClearPendingIRQ(SNVS_HP_WRAPPER_IRQn);
+        // Don't down clock on debug builds because it prevents the DAP from
+        // reading memory
+        #if CIRCUITPY_DEBUG == 0
         CLOCK_SetMode(kCLOCK_ModeWait);
+        #endif
         __WFI();
         CLOCK_SetMode(kCLOCK_ModeRun);
     }

supervisor/shared/serial.c

@@ -105,7 +105,7 @@ void serial_early_init(void) {
     common_hal_busio_uart_never_reset(&debug_uart);
 
     // Do an initial print so that we can confirm the serial output is working.
-    debug_uart_printf("Serial debug setup\n");
+    debug_uart_printf("Serial debug setup\r\n");
     #endif
 }
 

tests/circuitpython-manual/usb/device_info.py

@@ -0,0 +1,20 @@
+import usb_host
+import board
+import digitalio
+import usb.core
+import time
+
+if hasattr(board, "USB_HOST_POWER"):
+    d = digitalio.DigitalInOut(board.USB_HOST_POWER)
+    d.switch_to_output(value=True)
+    print("USB power on")
+
+h = usb_host.Port(board.USB_HOST_DP, board.USB_HOST_DM)
+
+while True:
+    for device in usb.core.find(find_all=True):
+        print(device.idVendor, device.idProduct)
+        print(device.manufacturer, device.product)
+        print(device.serial_number)
+    print()
+    time.sleep(10)