diff options
| author | Keith Packard <keithp@keithp.com> | 2013-06-17 14:00:11 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2013-06-17 14:00:11 -0700 |
| commit | 298e54856b5f8809b43f24407caa4a6be60822f3 (patch) | |
| tree | 670b834a18ff24f4d35d2c0d171dc9324d52a886 /src/lpc/ao_usb_lpc.c | |
| parent | b3ad488477def157e277e239e81f164b49725925 (diff) | |
altos/lpc: Get the IRC turned off after boot time
This involved carefully moving the USB away from the IRC before
turning it off.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src/lpc/ao_usb_lpc.c')
| -rw-r--r-- | src/lpc/ao_usb_lpc.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/src/lpc/ao_usb_lpc.c b/src/lpc/ao_usb_lpc.c index aac0df04..e574f1e2 100644 --- a/src/lpc/ao_usb_lpc.c +++ b/src/lpc/ao_usb_lpc.c @@ -834,8 +834,9 @@ ao_usb_disable(void) /* Turn off USB clock */ lpc_scb.usbclkdiv = 0; - /* Disable USB PHY */ - lpc_scb.pdruncfg |= (1 << LPC_SCB_PDRUNCFG_USBPAD_PD); + /* Disable USB PHY and PLL */ + lpc_scb.pdruncfg |= ((1 << LPC_SCB_PDRUNCFG_USBPAD_PD) | + (1 << LPC_SCB_PDRUNCFG_USBPLL_PD)); /* Disable USB registers and RAM */ lpc_scb.sysahbclkctrl &= ~((1 << LPC_SCB_SYSAHBCLKCTRL_USB) | @@ -877,7 +878,6 @@ ao_usb_enable(void) lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_USBPLL_PD); lpc_scb.usbpllclksel = (LPC_SCB_SYSPLLCLKSEL_SEL_SYSOSC << LPC_SCB_SYSPLLCLKSEL_SEL); - lpc_scb.usbpllclkuen = (1 << LPC_SCB_USBPLLCLKUEN_ENA); lpc_scb.usbpllclkuen = (0 << LPC_SCB_USBPLLCLKUEN_ENA); lpc_scb.usbpllclkuen = (1 << LPC_SCB_USBPLLCLKUEN_ENA); while (!(lpc_scb.usbpllclkuen & (1 << LPC_SCB_USBPLLCLKUEN_ENA))) @@ -887,6 +887,10 @@ ao_usb_enable(void) ; lpc_scb.usbclksel = 0; + lpc_scb.usbclkuen = (0 << LPC_SCB_USBCLKUEN_ENA); + lpc_scb.usbclkuen = (1 << LPC_SCB_USBCLKUEN_ENA); + while (!(lpc_scb.usbclkuen & (1 << LPC_SCB_USBCLKUEN_ENA))) + ; /* Turn on USB clock, use 48MHz clock unchanged */ lpc_scb.usbclkdiv = 1; |