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Diffstat (limited to 'nuttx/configs/stm3210e-eval/README.txt')
| -rwxr-xr-x | nuttx/configs/stm3210e-eval/README.txt | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/nuttx/configs/stm3210e-eval/README.txt b/nuttx/configs/stm3210e-eval/README.txt index c46f73811..d7df1ef9b 100755 --- a/nuttx/configs/stm3210e-eval/README.txt +++ b/nuttx/configs/stm3210e-eval/README.txt @@ -810,10 +810,48 @@ Where <subdir> is one of the following: This is a configuration that is used to test STM32 power management, i.e., to test that the board can go into lower and lower states of power usage as a result of inactivity. This configuration is based on the nsh2 - configuration with modifications for testing power management. + configuration with modifications for testing power management. This + configuration should provide some guideline for power management in your + STM32 application. CONFIG_STM32_CODESOURCERYW=y : CodeSourcery under Windows + CONFIG_PM_CUSTOMINIT and CONFIG_IDLE_CUSTOM are necessary parts of the + PM configuration: + + CONFIG_PM_CUSTOMINIT=y + + CONFIG_PM_CUSTOMINIT moves the PM initialization from arch/arm/src/stm32/stm32_pminitialiaze.c + to configs/stm3210-eval/src/up_pm.c. This allows us to support board- + specific PM initialization. + + CONFIG_IDLE_CUSTOM=y + + The bulk of the PM activities occur in the IDLE loop. The IDLE loop is + special because it is what runs when there is no other task running. Therefore + when the IDLE executes, we can be assure that nothing else is going on; this + is the ideal condition for doing reduced power management. + + The configuration CONFIG_IDLE_CUSTOM allows us to "steal" the normal STM32 + IDLE loop (of arch/arm/src/stm32/stm32_idle.c) and replace this with our own + custom IDLE loop (at configs/stm3210-eval/src/up_idle.c). + + Here are some additional things to note in the configuration: + + CONFIG_PM_BUTTONS=y + + CONFIG_PM_BUTTONS enables button support for PM testing. Buttons can drive + EXTI interrupts and EXTI interrrupts can be used to wakeup for certain reduced + power modes (STOP mode). The use of the buttons here is for PM testing purposes + only; buttons would normally be part the application code and CONFIG_PM_BUTTONS + would not be defined. + + CONFIG_RTC_ALARM=y + + The RTC alarm is used to wake up from STOP mode and to transition to + STANDBY mode. This used of the RTC alarm could conflict with other uses of + the RTC alarm in your application. + RIDE ---- This configuration builds a trivial bring-up binary. It is |