diff options
| author | Keith Packard <keithp@keithp.com> | 2019-06-18 13:02:51 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2019-06-18 13:02:51 -0700 |
| commit | 4d4f018f22a0a9814e675a232b1c4239572bdd9a (patch) | |
| tree | 3601e694437c2a64c8687acdf37e5fef9e4b30b7 /src/stmf0/ao_arch_funcs.h | |
| parent | 2ef794e60b4f6a6e9cb5e9a14ef732f7d6d36b3d (diff) | |
altos/micropeak-v2.0: Go into standby mode after landing
This is the lowest power state we can reach, and consumes about 15µA
or less.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src/stmf0/ao_arch_funcs.h')
| -rw-r--r-- | src/stmf0/ao_arch_funcs.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/stmf0/ao_arch_funcs.h b/src/stmf0/ao_arch_funcs.h index 9233f044..a0c6e088 100644 --- a/src/stmf0/ao_arch_funcs.h +++ b/src/stmf0/ao_arch_funcs.h @@ -447,6 +447,31 @@ static inline void ao_arch_restore_stack(void) { asm("pop {r0-r7,pc}\n"); } +static inline void ao_sleep_mode(void) { + + /* + WFI (Wait for Interrupt) or WFE (Wait for Event) while: + – Set SLEEPDEEP in Cortex ® -M0 System Control register + – Set PDDS bit in Power Control register (PWR_CR) + – Clear WUF bit in Power Control/Status register (PWR_CSR) + */ + + ao_arch_block_interrupts(); + + stm_scb.scr |= (1 << STM_SCB_SCR_SLEEPDEEP); + ao_arch_nop(); + stm_pwr.cr |= (1 << STM_PWR_CR_PDDS) | (1 << STM_PWR_CR_LPDS); + ao_arch_nop(); + stm_pwr.cr |= (1 << STM_PWR_CR_CWUF); + ao_arch_nop(); + ao_arch_nop(); + ao_arch_nop(); + ao_arch_nop(); + ao_arch_nop(); + asm("wfi"); + ao_arch_nop(); +} + #ifndef HAS_SAMPLE_PROFILE #define HAS_SAMPLE_PROFILE 0 #endif |