AN2979 datasheet(6/12 Pages) STMICROELECTRONICS

Part #	AN2979

Description	Implementing a simple ADC using the STM8L101xx comparator

PDF	12 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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6 / 12 page

Software description

AN2979

6/12

Doc ID 15651 Rev 1

2.1

Application flowcharts

Figure 4.

Main loop flowchart

Figure 5.

Get conversion value flowchart

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Configure the system clock to provide a master

clock frequency f

MASTER = 16 MHz

Enable TIM2 peripheral clock

Configure PC4 as input floating

Configure PB0 as output push pull for the PWM

Comparator configuration

Enable comparator interface

Configure COMP2 channel3

With external reference and polarity high

Connect Comp2 output to the TIM2 input capture1

TIM configuration

TIM2 to generate the PWM

Enable TIM2 capture / compare interrupt enable

Enable general interrupts

SPI configuration

Display on LCD

Configure COMP2 channel4

Compare to the reference value

Enable TIM2

Display on LCD

Start

Clock configuration

GPIO configuration

A/D converter

initialization

LCD configuration

Calibration

Optional

Start A/D conversion

End

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Get timer value

Get the conversion value

Clear TIM2 pending bit

Display on the LCD

Start

End

> VREF

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