half-way commit to explain some of what is going on

[clinton/Smoothieware.git] / src / libs / Pin.h

#ifndef PIN_H
#define PIN_H

#include <stdlib.h>
#include "libs/LPC17xx/sLPC17xx.h" // smoothed mbed.h lib
#include "libs/Kernel.h"
#include "libs/utils.h"
#include <string>

class Pin{
    public:
        Pin(){ }

        Pin* from_string(std::string value){
            LPC_GPIO_TypeDef* gpios[5] ={LPC_GPIO0,LPC_GPIO1,LPC_GPIO2,LPC_GPIO3,LPC_GPIO4};
            this->port_number =  atoi(value.substr(0,1).c_str());  
            this->port = gpios[this->port_number]; 
            this->inverting = ( value.find_first_of("!")!=string::npos ? true : false );
            this->pin  = atoi( value.substr(2, value.size()-2-(this->inverting?1:0)).c_str() );
            return this;
        }

        inline Pin*  as_output(){
            this->port->FIODIR |= 1<<this->pin;
            return this;
        }  

        inline Pin*  as_input(){
            this->port->FIODIR &= ~(1<<this->pin);
            return this;
        }  

        inline Pin* as_open_drain(){
            if( this->port_number == 0 ){ LPC_PINCON->PINMODE_OD0 |= (1<<this->pin); }
            if( this->port_number == 1 ){ LPC_PINCON->PINMODE_OD1 |= (1<<this->pin); }
            if( this->port_number == 2 ){ LPC_PINCON->PINMODE_OD2 |= (1<<this->pin); }
            if( this->port_number == 3 ){ LPC_PINCON->PINMODE_OD3 |= (1<<this->pin); }
            if( this->port_number == 4 ){ LPC_PINCON->PINMODE_OD4 |= (1<<this->pin); }
            return this;
        }

        inline bool get(){
            return this->inverting ^ (( this->port->FIOPIN >> this->pin ) & 1);
        }

        inline void set(bool value){
            if( this->inverting ^ value ){
                this->port->FIOSET = 1 << this->pin;
            }else{
                this->port->FIOCLR = 1 << this->pin;
            }        
        }

        bool inverting; 
        LPC_GPIO_TypeDef* port;
        char port_number;
        char pin; 
};




#endif