AN2629 datasheet(36/43 Pages) STMICROELECTRONICS

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Using the Stop and Standby mode in battery-operated applications

AN2629

36/43

Doc ID 13922 Rev 2

7.2.2

Detailed description

The example performs a periodic ADC conversion and stores the value in RAM buffer. It

uses Auto-Wakeup (AWU) from low-power mode as described in Section 1.2.7: Auto-

wakeup (AWU) from low-power mode on page 13.

●

At the beginning, functions configure the clock, GPIO, RTC and ADC. These functions

are implemented at the end of the main.c and use the STM32F10xxx standard

peripheral library.

●

The RTC is running and, each ADC conversion and storage are gated by the RTC

Alarm in the main loop.

●

The RTC Alarm wakes up the STM32F10xxx from the WFE or STOP_WFE mode.

●

the PC1 I/O shows the time taken by the ADC conversion and RTC Alarm register

reload.

Figure 7.

WFE

& STOP WFE

Hardware environment

Use this example with STM32F10xxx evaluation board: refer to the user manual UM0426:

“STM3210B-EVAL evaluation board” to use the STM3210B-EVAL.

After connecting the power supply and JTAG tools, the power consumption can be

measured by replacing Jumper JP9 by an ammeter.

Firmware description

●

Launch this example with the used toolchain:

The standard tools can be used to run the example.

The .uv2 file used to launch the project with the RVMDK toolchain is contained in the

RVMDK folder.

The .eww file, used to launch the project with the EWARM toolchain, is in the EWARM

folder.

●

Configure the firmware

At the beginning of the main.c, four #define can be selected to parameterize the

example:

–2 #define select the timing of the loop:

#define LOOP_20ms

#define LOOP_200ms

–2 more #define select the low-power mode:

#define WFE

#define STOP_WFE

–

For the example to run, it is necessary to keep one #define of each type.

–

After compiling the example, the STM32F10xxx Flash memory can be

downloaded.

RTC alarm

ADC

WFE or ST OP WFE mode

conversion

ADC

conversion

RTC alarm

PC1

ai14679

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