From dd7699cf8daded17ac41abf5c5170cfb599b6ff5 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Mon, 7 May 2012 21:49:24 -0700 Subject: [PATCH] altos: stm: delay during USB config with pull-up off This makes sure that a reboot will reliably cause the device to disconnect from the USB bus. Signed-off-by: Keith Packard --- src/stm/ao_usb_stm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/stm/ao_usb_stm.c b/src/stm/ao_usb_stm.c index 71bf1bc7..c093f526 100644 --- a/src/stm/ao_usb_stm.c +++ b/src/stm/ao_usb_stm.c @@ -937,7 +937,7 @@ ao_usb_disable(void) void ao_usb_enable(void) { - uint16_t tick; + int t; /* Enable SYSCFG */ stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_SYSCFGEN); @@ -985,6 +985,8 @@ ao_usb_enable(void) (0 << STM_USB_CNTR_PDWN) | (0 << STM_USB_CNTR_FRES)); + for (t = 0; t < 1000; t++) + ao_arch_nop(); /* Enable USB pull-up */ stm_syscfg.pmc |= (1 << STM_SYSCFG_PMC_USB_PU); } -- 2.30.2