From 1d93451981ecf94d78161f8f735a04bf771ebeb3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?King=20K=C3=A9vin?= <kingkevin@cuvoodoo.info>
Date: Fri, 24 Sep 2021 16:00:55 +0200
Subject: [PATCH] application: disable VBUS sensing

---
 application.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/application.c b/application.c
index ba21734..96158e3 100644
--- a/application.c
+++ b/application.c
@@ -24,6 +24,7 @@
 #include <libopencm3/stm32/dbgmcu.h> // debug utilities
 #include <libopencm3/stm32/desig.h> // design utilities
 #include <libopencm3/stm32/flash.h> // flash utilities
+#include <libopencm3/usb/dwc/otg_fs.h> // USB definitions
 
 /* own libraries */
 #include "global.h" // board definitions
@@ -379,6 +380,8 @@ void main(void)
 	board_setup(); // setup board
 	uart_setup(); // setup USART (for printing)
 	usb_cdcacm_setup(); // setup USB CDC ACM (for printing)
+	OTG_FS_GCCFG |= OTG_GCCFG_NOVBUSSENS | OTG_GCCFG_PWRDWN; // disable VBUS sensing
+	OTG_FS_GCCFG &= ~(OTG_GCCFG_VBUSBSEN | OTG_GCCFG_VBUSASEN); // force USB device mode
 	puts("\nwelcome to the CuVoodoo STM32F4 example firmware\n"); // print welcome message
 
 #if DEBUG