ST9 datasheet(103/146 Pages) STMICROELECTRONICS

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ST9 USER GUIDE

4.8.1.3 Function Prototype Declarations

Each of these functions can be called by the main program <mainc.c> or other functions for

managing the ADC. They are defined in the <adc.c> file.

The <adc.h> file function prototypes are:

void INIT_ADC(void);

void START_ADC(void);

void STOP_ADC(void);

void INIT_ADC_IT(void);

void Enable_ADC_IT(void);

4.8.1.4 Defining the Functional Mode

To initialize the peripheral mode, you can activate the define directive by removing the <</* */

>>.

e.g.: In the <adc.h> file, you can select Continuous mode with:

#define continuous

/*#define single*/

4.8.2 Peripheral Function File

These files contain the peripheral management functions. The function prototypes are placed

in the header file as explained before.

The functional mode and the constants initialized in the header file modify the functions so that

they can be used directly by the application program.

Presentation of Peripheral Function Files:-

4.8.2.1 ADC File

The ADC function file is <adc.c> and contains 6 functions initialized for using channel 15 of the

ADC corresponding to I/O port P7.7. It performs 15 conversions and stores the converted

values in chart.. Moreover, the analog watchdog is enabled on this channel and stops the se-

ries of conversions if the value is not within the prescribed thresholds.

Table 4.

ADC.C Functions

Function

Description and Comments

void INIT_ADC(void);

Choice between Continuous and Single-shot modes. Possibility of initializ-

ing the analog watchdog on channel A or/and B.

void START_ADC(void);

Choice between three triggers to start the conversions: internal, external

or software.

void STOP_ADC(void);

This routine stops the ADC after a series of conversions. Afterwards, all

power consuming logic is disabled (low power idle mode).

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