Software configuration

AN2278

4/9

3

Software configuration

All the source files are in ‘C’ language and the application uses ST7 software library

functions.

The application works in two modes:

1.

Configuration mode (refer to the flowchart in Figure 1)

2.

Normal mode (refer to the flowcharts in Figure 2 and Figure 3)

Since Button5 and Button6 are not connected to the microcontroller interrupt I/Os, polling

mode is used to read the request status resulting from pressing these buttons.

The main function is organized as follows:

while(1)

{

------------------------------

------------------------------

code=1;

switch (code)

{

case 1:

//Configuration Mode

break;

case 2:

//Read temperature log from EEPROM and display on hyperterminal

break;

case 3:

// Sense temperature in 16 samples (refer to the flowchart in Figure

3.)

// Display average temperature every 1 sec on hyperterminal

// if temperature is out of bounds(set in configuration mode)

// then toggle LED

// else continue

// Record max and min temperature over 1 hr

// Write max and min temperature to EEPROM

break;

}

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-----------------------------

if(!(IO_Read(IO_PORT_C) & 0x20)) //Poll for Button 5

code=1;

else if(!(IO_Read(IO_PORT_C) & 0x80)) //Poll for Button 6

code=2;

------------------------------

------------------------------

}