From 20a4b38126be234c5f946df9254c7d64502ff855 Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Mon, 14 Feb 2011 19:45:28 +0000
Subject: STM32 USB reset done right.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2739 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/platforms/STM32/usb_lld.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

(limited to 'os')

diff --git a/os/hal/platforms/STM32/usb_lld.c b/os/hal/platforms/STM32/usb_lld.c
index 5125f1cee..0a7bc9315 100644
--- a/os/hal/platforms/STM32/usb_lld.c
+++ b/os/hal/platforms/STM32/usb_lld.c
@@ -319,7 +319,8 @@ void usb_lld_start(USBDriver *usbp) {
                        CORTEX_PRIORITY_MASK(STM32_USB_USB1_HP_IRQ_PRIORITY));
       NVICEnableVector(USB_LP_CAN1_RX0_IRQn,
                        CORTEX_PRIORITY_MASK(STM32_USB_USB1_LP_IRQ_PRIORITY));
-
+      /* Releases the USB reset.*/
+      STM32_USB->CNTR = 0;
     }
 #endif
     /* Reset procedure enforced on driver start.*/
@@ -360,11 +361,8 @@ void usb_lld_stop(USBDriver *usbp) {
 void usb_lld_reset(USBDriver *usbp) {
   uint32_t cntr;
 
-  /* Powers up the transceiver while holding the USB in reset state.*/
-  STM32_USB->CNTR   = CNTR_FRES;
-
-  /* Releases the USB reset, BTABLE is reset to zero.*/
-  STM32_USB->CNTR   = 0;
+  /* Post reset initialization.*/
+  STM32_USB->BTABLE = 0;
   STM32_USB->ISTR   = 0;
   STM32_USB->DADDR  = DADDR_EF;
   cntr              = /*CNTR_ESOFM | */ CNTR_RESETM  | /*CNTR_SUSPM |*/
-- 
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