From 1a00d1bdaf870fab1bfaca2aeaac78a9ad806bad Mon Sep 17 00:00:00 2001
From: Marcio Teixeira <marcio@alephobjects.com>
Date: Tue, 23 Oct 2018 14:12:42 -0600
Subject: [PATCH] Add pullup to USB interrupt line

- A pullup on the INT pin is required when the pin is level-active
---
 Marlin/src/sd/usb_flashdrive/usb_host.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Marlin/src/sd/usb_flashdrive/usb_host.cpp b/Marlin/src/sd/usb_flashdrive/usb_host.cpp
index 75a2dc7bba..71155b82ac 100644
--- a/Marlin/src/sd/usb_flashdrive/usb_host.cpp
+++ b/Marlin/src/sd/usb_flashdrive/usb_host.cpp
@@ -109,8 +109,8 @@ bool MAX3421e::reset() {
 bool MAX3421e::start() {
   // Initialize pins and SPI bus
 
-  SET_OUTPUT(SDSS);
-  SET_INPUT(USB_INTR_PIN);
+  SET_OUTPUT(USB_CS_PIN);
+  SET_INPUT_PULLUP(USB_INTR_PIN);
   ncs();
   spiBegin();