General Input

This module can be used to configure a GPIO as a general input pin. Possible GPIO-values as input parameter are defined in global_defines.h and can also be seen in this overview table.
The module allows to read the applied signal-value of the input pin (high=1/low=0).
Furthermore an interrupt can be configured for an input pin at different events: 0=falling edge, 1=rising edge, 2=falling and rising edge.
The function interrupt_ack() needs to be called at the end of an interrupt service routine, to acknowledge more interrupts.

For GPIO0 - GPIO31: Two external interrupts can be configured (XINT1 - XINT2)
For GPIO32 - GPIO63: Five external interrupts can be configured (XINT3 - XINT7)

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Code example

#include "global_defines.h"                                                     //Include global_defines.h
#include "general_input/general_input.h"                                        //Include module of general_input
#include "system_controls/system_controls.h"                                    //Include module of system_controls
 
__interrupt void isr(void);                                                     //Function prototype for interrupt service routine
 
void main(void){
    int result = 0;                                                             //Optional: can be used to check return values of functions
    setSystemControls();                                                        //Call setSystemControls() function
    result = init_generalInputPin(GPIO0);                                       //Configures GPIO0 as general input pin. Returns result of operation
    result = generalInputPin_getValue(GPIO0);                                   //Get value of input pin. Returns value of applied signal on input pin (0=low/1=high) or -1 for invalid input parameter
    result = generalInputPin_configureExternalInterrupt(GPIO0, &isr, 0);        //Configuring GPIO0 to listen for falling edge and to call function xint1_isr on interrupt. Returns result of operation
    while(1){
                                                                                //Endless loop
    }
}
 
__interrupt void isr(void){
    static int i = 0;
    i++;
    generalInputPin_interruptAck();                                             //Acknowledgement to get more interrupts
}

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Documented C-Code of module:

general_input

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Detailed description in Technical Reference Manual:

Technical_Reference_Manual