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altos/lpc: Make sure USB pull-up is held low at boot for 'a while'
author
Keith Packard
<keithp@keithp.com>
Tue, 9 Oct 2018 02:42:09 +0000
(19:42 -0700)
committer
Keith Packard
<keithp@keithp.com>
Tue, 9 Oct 2018 02:42:09 +0000
(19:42 -0700)
Add a delay loop to make sure the host sees the pull-up low for long
enough.
Signed-off-by: Keith Packard <keithp@keithp.com>
src/lpc/ao_usb_lpc.c
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diff --git
a/src/lpc/ao_usb_lpc.c
b/src/lpc/ao_usb_lpc.c
index c50e752883faca07f5d92b0965c203d2db160eaf..d26a1437f9b34c94e8d8c93ca1ea051c8fe0906d 100644
(file)
--- a/
src/lpc/ao_usb_lpc.c
+++ b/
src/lpc/ao_usb_lpc.c
@@
-1013,7
+1013,11
@@
void
ao_usb_init(void)
{
#if HAS_USB_PULLUP
ao_usb_init(void)
{
#if HAS_USB_PULLUP
+ int i;
ao_enable_output(AO_USB_PULLUP_PORT, AO_USB_PULLUP_PIN, AO_USB_PULLUP, 0);
ao_enable_output(AO_USB_PULLUP_PORT, AO_USB_PULLUP_PIN, AO_USB_PULLUP, 0);
+
+ for (i = 0; i < 40000; i++)
+ ao_arch_nop();
#endif
ao_usb_enable();
#endif
ao_usb_enable();