(1 << LPC_SCB_SYSAHBCLKCTRL_GPIO) |
(1 << LPC_SCB_SYSAHBCLKCTRL_IOCON));
+ /* Enable the brown-out detection at the highest voltage to
+ * make sure the flash part remains happy
+ */
+
+ lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_BOD_PD);
+ lpc_scb.bodctrl = ((LPC_SCB_BOD_BODRSTLEV_2_63 << LPC_SCB_BOD_BODRSTLEV) |
+ (LPC_SCB_BOD_BODINTVAL_RESERVED << LPC_SCB_BOD_BODINTVAL) |
+ (1 << LPC_SCB_BOD_BODRSTENA));
+
/* Turn the IRC clock back on */
lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_IRC_PD);
ao_clock_delay();
/* Switch to the IRC clock */
lpc_scb.mainclksel = LPC_SCB_MAINCLKSEL_SEL_IRC << LPC_SCB_MAINCLKSEL_SEL;
- lpc_scb.mainclkuen = (1 << LPC_SCB_MAINCLKUEN_ENA);
lpc_scb.mainclkuen = (0 << LPC_SCB_MAINCLKUEN_ENA);
lpc_scb.mainclkuen = (1 << LPC_SCB_MAINCLKUEN_ENA);
while (!(lpc_scb.mainclkuen & (1 << LPC_SCB_MAINCLKUEN_ENA)))
;
+ /* Switch USB to the main clock */
+ lpc_scb.usbclksel = (LPC_SCB_USBCLKSEL_SEL_MAIN_CLOCK << LPC_SCB_USBCLKSEL_SEL);
+ 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)))
+ ;
+
/* Find a PLL post divider ratio that gets the FCCO in range */
for (p = 0; p < 4; p++)
if (AO_LPC_CLKOUT << (1 + p) >= AO_LPC_FCCO_MIN)
lpc_scb.usbclkdiv = 0;
lpc_scb.clkoutdiv = 0;
-#if 0
+ /* Switch USB PLL source to system osc so we can power down the IRC */
+ lpc_scb.usbpllclksel = (LPC_SCB_USBPLLCLKSEL_SEL_SYSOSC << LPC_SCB_USBPLLCLKSEL_SEL);
+ 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)))
+ ;
+
/* Power down everything we don't need */
lpc_scb.pdruncfg = ((1 << LPC_SCB_PDRUNCFG_IRCOUT_PD) |
(1 << LPC_SCB_PDRUNCFG_IRC_PD) |
- (1 << LPC_SCB_PDRUNCFG_BOD_PD) |
+ (0 << LPC_SCB_PDRUNCFG_BOD_PD) |
(1 << LPC_SCB_PDRUNCFG_ADC_PD) |
(1 << LPC_SCB_PDRUNCFG_WDTOSC_PD) |
(1 << LPC_SCB_PDRUNCFG_USBPLL_PD) |
(1 << LPC_SCB_PDRUNCFG_USBPAD_PD) |
(1 << 11) |
(7 << 13));
-#endif
}