From: Keith Packard <keithp@keithp.com>
Date: Tue, 9 Oct 2018 02:42:09 +0000 (-0700)
Subject: altos/lpc: Make sure USB pull-up is held low at boot for 'a while'
X-Git-Tag: 1.8.7~1^2
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=e7136c6b413c8464d32cdc4afc28c93ba1f17a3b

altos/lpc: Make sure USB pull-up is held low at boot for 'a while'

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>
---

diff --git a/src/lpc/ao_usb_lpc.c b/src/lpc/ao_usb_lpc.c
index c50e7528..d26a1437 100644
--- 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
+	int	i;
 	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();