diff options
Diffstat (limited to 'nuttx/arch/arm/src/lpc17xx/lpc17_idle.c')
| -rw-r--r-- | nuttx/arch/arm/src/lpc17xx/lpc17_idle.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_idle.c b/nuttx/arch/arm/src/lpc17xx/lpc17_idle.c index 88cd817f7..133847659 100644 --- a/nuttx/arch/arm/src/lpc17xx/lpc17_idle.c +++ b/nuttx/arch/arm/src/lpc17xx/lpc17_idle.c @@ -41,7 +41,9 @@ #include <nuttx/config.h> #include <nuttx/arch.h> + #include "up_internal.h" +#include "lpc17_gpdma.h" /**************************************************************************** * Pre-processor Definitions @@ -94,11 +96,25 @@ void up_idle(void) sched_process_timer(); #else - /* Sleep until an interrupt occurs to save power */ +/* If the g_dma_inprogress is zero, then there is no DMA in progress. This + * value is needed in the IDLE loop to determine if the IDLE loop should + * go into lower power power consumption modes. According to the LPC17xx + * User Manual: "The DMA controller can continue to work in Sleep mode, and + * has access to the peripheral SRAMs and all peripheral registers. The + * flash memory and the Main SRAM are not available in Sleep mode, they are + * disabled in order to save power." + */ + +#ifdef CONFIG_LPC17_GPDMA + if (g_dma_inprogress == 0) +#endif + { + /* Sleep until an interrupt occurs in order to save power */ - BEGIN_IDLE(); - asm("WFI"); - END_IDLE(); + BEGIN_IDLE(); + asm("WFI"); + END_IDLE(); + } #endif } |