Power Save - Tickless Mode

Materials

AmebaD [ AMB23 / AMB21 / AMB22 / BW16 / AW-CU488 Thing Plus ] x 1

Example

Introduction

Ameba-D supports two low power modes which are deepsleep mode and sleep mode. The power consumptions of Tickless Sleep Mode is around 28uA to 30uA compared to normal state around 15mA. This example describes how to use freertos tickless with UART interruptable interface.

Procedure
Open “File” -> “Examples” -> “AmebaPowerSave” -> “TicklessMode”

Set condition values as picture below.
“TL_WAKEUP_SOURCE” is used to set the wake-up source, user can chose 3 wake up sources now,
LOGUART(SET_TL_UART_WAKEUP);
RTC Timer(SET_TL_RTC_WAKEUP);
AON pins(SET_AON_WAKEPIN_WAKEUP);

Using LOGUART as wakeup source
When the LOGUART is selected as the wakeup source, the “TL_Suspend_function” will enter sleep mode. And then it is kept alive for 13s then enter sleep mode. To wakeup, press enter.
Using RTC Timer as wakeup source
RTC Timer wakeup system is by setting alarm. The alarm has 4 values to be set, day, hour, min and sec. All 4 values can be set by DS_RTC_ALARM_DAY, DS_RTC_ALARM_HOUR, DS_RTC_ALARM_MIN, and DS_RTC_ALARM_SEC.

Using AON GPIO pins as wakeup source
For AMB21, there are 5 pins that can be set as AON pins and active high for wakeup, GPIOA25(D16), GPIOA26(D17), GPIOA21(D26), GPIOA20(D27), GPIOA(D28).

For AMB23, there are 8 pins that can be set as AON pins and active high for wakeup, GPIOA12(D9), GPIOA13(D10), GPIOA14(D11), GPIOA15(D12), GPIOA16(D13), GPIOA18(D15), GPIOA19(D16), GPIOA21(D18).

For BW16/BW16 type C, there is only 6 pins that can be set as AON pin and active high for wakeup, GPIOA_25 (D7), GPIOA_26 (D8), GPIOA_15 (D9), GPIOA_14 (D10), GPIOA_13 (D11), GPIOA_12 (D12).