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General Purpose Input/Output Labs
EXAMPLE 3-18:
INITIALIZE() FOR GPIO LAB 5
//Clear PORTC to a known state
//Set the least significant bit to 1 so that it can be
//shifted through
PORTC = 0b00000001;
//Clear the PORTA register to a known state
PORTA = 0b00000000;
//Configure PORTC's ANALOG/DIGITAL pins as all Digital
ANS4 = 0;//Associated with RC0
ANS5 = 0;//Associated with RC1
ANS6 = 0;//Associated with RC2
ANS7 = 0;//Associated with RC3
ANS8 = 0;//Associated with RC6
ANS9 = 0;//Associated with RC7
//Configure PORTC pins as all output
//i.e. 1 = Input, 0 = Output
TRISC0 = 0;//Associated with RC0
TRISC1 = 0;//Associated with RC1
TRISC2 = 0;//Associated with RC2
TRISC3 = 0;//Associated with RC3
TRISC4 = 0;//Associated with RC4
TRISC5 = 0;//Associated with RC5
TRISC6 = 0;//Associated with RC6
TRISC7 = 0;//Associated with RC7
//Configure PORTA bit RA0 as Digital input
ANS2 = 0;
TRISA2 = 1;
//Configure Timer0 to overflow every 5mS
T0CS = 0; //Select FOSC/4 as Timer0 clock source
T0SE = 0; //Increment TMR0 on rising clock edge
PSA = 0; //Assign prescaler to Timer0
//Select a 1:32 prescaler
PS0 = 0;
PS1 = 0;
PS2 = 1;
//Initialize the direction flag to shift bits from
//right-to-left
//(i.e. 0 = Shift PORTC bits from right-to-left
// 1 = Shift PORTC bits from left-to-right
direction = 0;
//Initialize LED_Output to all zeros
LED_Output = 0b00000000;
? 2009 Microchip Technology Inc.
DS41369A-page 45
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