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ST9 USER GUIDE

4.8 PERIPHERAL INITIALIZATION

All the ST9 peripherals have a large number of configuration options. This makes them highly

adaptable, but has a complex initialization procedure.

To help you to use the peripherals easily, you can find all the initialization programs on the

<http://www.stmcu.com> internet site.

The purpose of these programs is to give you C language programs to get started with pro-

gramming each peripheral. This program package consists of a Header file, a peripheral func-

tion, a startup and a main program for each peripheral.

The startup (crtbegin.spp) and the main (main.c) files are not explained here. Have a look at

these files for more details. All you now have to know is that whenever an interrupt subroutine

is used, the startup program is initialized with the interrupt subroutine address.

For example the INTADC_EndConv() ADC interrupt subroutine address declared in the file

<adc.c> is loaded in the startup routine <crtbegin.spp> at the Interrupt Vector Register loca-

tion.

4.8.1 initialization Header File

The initialization header file defines all the constants, the file to be included, the function pro-

totypes and the peripheral mode.

The initialization header file has to be included any time the peripheral is referenced. The next

section uses the Analog to Digital Converter peripheral file as an example. The ADC initializa-

tion header file is <adc.h>.

4.8.1.1 Constants already Initialized and to be Initialized

The <adc.h> file is complementary to the <ad_c_16.h> header file located in the toolchain

header files directory, with the other peripheral header files.

The 16 initialized constants, CHANNEL0 to CHANNEL15, give you the 16 possibilities of ini-

tializing the non-initialized constant AD_CHANNEL. This constant will initialize the AD_CLR1

ADC Control Logic Register1 in the <adc.c> file.

4.8.1.2 Files to be Included

The files to be included contain other initialized constants like in the previous <adc.h> file.

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