Microchip Technology Humidity Sensor PICtail Specifikace stáhnout pdf (Strana 66)

During processing of this file, HTTP encounters the „%04‟ string. After parsing it,

HTTP makes a callback. HTTPGetVar(4, HTTP_START_OF_VAR, &value). In

Figure 20, the main user application implements HTTPGetVar function as

follows:

WORD HTTPGetVar(BYTE var, WORD ref, BYTE *val)

{

// Identify variable.

// Is it RB5 ?

if ( var == 4 )

{

// We will simply return „1‟ if RB5 is high,

// or „0‟ if low.

if ( PORTBbits.RB5 )

*val = „1‟;

else

*val = „0;

// Tell HTTP that this is last byte of

// variable value.

return HTTP_END_OF_VAR;

}

else

// Check for other variables...

...

}

Figure 20 HTTPGetVar Function

2.8 MPFS

The Microchip HTTP server uses a simple file system (MPFS) to store

Webpages. The image of the file system can be stored in on-chip program

memory, or on an external serial EEPROM. Below is Figure 21 which describes

how the MPFS stores multiple files:

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 148 149

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Microchip Technology Humidity Sensor PICtail Specifikace Strana 66