AN3128 datasheet(95/105 Pages) STMICROELECTRONICS

95 / 105 page

AN3128

Getting started with the system

Doc ID 16918 Rev 5

95/105

/* Touch Screen Init */

TSC_Init();

/* Joystick Init */

GL_JoyStickConfig_IOExpander();

/* Set the last Flash Memory address */

Set_LastFlashMemoryAddress( 0x08040000 );

/* If key is pressed - Start Calibration */

while( GPIO_ReadInputDataBit(USER_BUTTON_PORT, USER_BUTTON_PIN) && (time_out>0) )

time_out--;

if (time_out>0)

TS_Calibration();

GL_Clear(GL_White);

...

/* Check if Calibration has been done*/

TS_CheckCalibration();

/*Initialize cursor*/

GL_Clear(White);

CursorInit(GL_NULL);

/* Menu Initialization*/

Show_Menu();

CursorShow( LCD_Height/2, LCD_Width/2 );

/* Infinite main loop ------------------------------------------------------*/

while (1)

{

/* Catching touch events */

if ( calibration_done )

{

ProcessInputData ();

}

/*Time out calculate for power saving mode*/

TimeOutCalculate();

CursorReadJoystick(POLLING_MODE);

TSC_Read();

}

The initialization process is in charge of preparing the basic mechanism of the system. The

clock distribution and the interrupt settings are two components that are strongly dependent

on the target project. An example of clock rate may be 72 MHz as the maximum speed of

the current STM32 microcontroller. It can be decreased to reduce the power consumption.

Special attention should be paid to the SysTick counter and its related delay routine which

generates a variable time latency in multiples of 10 ms. The clock rate assumptions are:

●

System HCLK - 72 MHz

●

Low speed peripheral PCLK1 - 36 MHz

●

High speed peripheral PCLK2 - 72 MHz

The interrupt setting situation is very similar to clock distribution. The library functions

involved with interrupt managing do not take care of the priorities, they only perform very

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