From 23f11b188fc6aacd29e7f01a7d8a40853b7655df Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Fri, 21 Jun 2013 19:39:27 -0700 Subject: [PATCH] altos/lpc: Enable brown-out-detector Make sure the processor does something sensible when the power disappears. Signed-off-by: Keith Packard --- src/lpc/ao_timer_lpc.c | 11 ++++++++++- src/lpc/lpc.h | 12 ++++++++++++ 2 files changed, 22 insertions(+), 1 deletion(-) diff --git a/src/lpc/ao_timer_lpc.c b/src/lpc/ao_timer_lpc.c index c0de90a3..44fb410e 100644 --- a/src/lpc/ao_timer_lpc.c +++ b/src/lpc/ao_timer_lpc.c @@ -100,6 +100,15 @@ ao_clock_init(void) (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(); @@ -194,7 +203,7 @@ ao_clock_init(void) /* 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) | diff --git a/src/lpc/lpc.h b/src/lpc/lpc.h index d66f0dd0..f13ec615 100644 --- a/src/lpc/lpc.h +++ b/src/lpc/lpc.h @@ -609,6 +609,18 @@ extern struct lpc_scb lpc_scb; #define LPC_SCB_CLKOUTUEN_ENA 0 +#define LPC_SCB_BOD_BODRSTLEV 0 +# define LPC_SCB_BOD_BODRSTLEV_1_46 0 +# define LPC_SCB_BOD_BODRSTLEV_2_06 1 +# define LPC_SCB_BOD_BODRSTLEV_2_35 2 +# define LPC_SCB_BOD_BODRSTLEV_2_63 3 +#define LPC_SCB_BOD_BODINTVAL 2 +# define LPC_SCB_BOD_BODINTVAL_RESERVED 0 +# define LPC_SCB_BOD_BODINTVAL_2_22 1 +# define LPC_SCB_BOD_BODINTVAL_2_52 2 +# define LPC_SCB_BOD_BODINTVAL_2_80 3 +#define LPC_SCB_BOD_BODRSTENA 4 + #define LPC_SCB_PDRUNCFG_IRCOUT_PD 0 #define LPC_SCB_PDRUNCFG_IRC_PD 1 #define LPC_SCB_PDRUNCFG_FLASH_PD 2 -- 2.30.2