Pin.cpp

00001 #include "Pin.h"
00002 
00003 #include "utils.h"
00004 #include "Targets/Target.h"
00005 
00006 Pin::Pin(){
00007     this->inverting= false;
00008 }
00009 
00010 // Make a new pin object from a string
00011 Pin* Pin::from_string(std::string value){
00012     // Find the end of the pin name.
00013     std::string::size_type e = value.find_first_of("!o^V-@\n\r\t ");
00014     name = pin_name_from_string(value.substr(0, e));
00015     if (name == NC)
00016         return this;
00017         
00018     gpio_init(&pin, name, PIN_INPUT);
00019     
00020     // The current position in the string
00021     const char* cn = value.c_str() + e;
00022 
00023     for (;*cn;cn++) {
00024         switch(*cn) {
00025             case '!':
00026                 this->inverting = true;
00027                 break;
00028             case 'o':
00029                 as_open_drain();
00030                 break;
00031             case '^':
00032                 pull_up();
00033                 break;
00034             case 'v':
00035                 pull_down();
00036                 break;
00037             case '-':
00038                 pull_none();
00039                 break;
00040             case '@':
00041                 as_repeater();
00042                 break;
00043             default:
00044                 // skip any whitespace following the pin index
00045                 if (!is_whitespace(*cn))
00046                     return this;
00047         }
00048     }
00049 
00050     // from_string failed. TODO: some sort of error
00051     inverting = false;
00052     return this;
00053 }
00054 
00055 // Configure this pin as OD
00056 Pin* Pin::as_open_drain(){
00057     if (!connected()) return this;
00058     gpio_mode(&pin, OpenDrain);
00059     pull_none(); // no pull up by default
00060     return this;
00061 }
00062 
00063 
00064 // Configure this pin as a repeater
00065 Pin* Pin::as_repeater(){
00066     if (!connected()) return this;
00067     // ?
00068     return this;
00069 }
00070 
00071 // Configure this pin as no pullup or pulldown
00072 Pin* Pin::pull_none(){
00073     if (!connected()) return this;
00074     gpio_mode(&pin, PullNone);
00075     return this;
00076 }
00077 
00078 // Configure this pin as a pullup
00079 Pin* Pin::pull_up(){
00080     if (!connected()) return this;
00081     gpio_mode(&pin, PullUp);
00082     return this;
00083 }
00084 
00085 // Configure this pin as a pulldown
00086 Pin* Pin::pull_down(){
00087     if (!connected()) return this;
00088     gpio_mode(&pin, PullDown);
00089     return this;
00090 }