diff options
| author | Keith Packard <keithp@keithp.com> | 2012-05-07 21:49:24 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2012-05-07 21:49:24 -0700 |
| commit | dd7699cf8daded17ac41abf5c5170cfb599b6ff5 (patch) | |
| tree | 065f70d89c9459eb78d4022ca4df9845899dea06 /src | |
| parent | 744d05e6037ffc11688a9faa9c7b5dcda4065ee3 (diff) | |
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 <keithp@keithp.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/stm/ao_usb_stm.c | 4 |
1 files changed, 3 insertions, 1 deletions
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); } |