src/libs/Pin.cpp

   1 #include "Pin.h"
   2
   3 #include "utils.h"
   4
   5 Pin::Pin(){
   6     this->inverting= false;
   7 }
   8
   9 // Make a new pin object from a string
  10 Pin* Pin::from_string(std::string value){
  11     LPC_GPIO_TypeDef* gpios[5] ={LPC_GPIO0,LPC_GPIO1,LPC_GPIO2,LPC_GPIO3,LPC_GPIO4};
  12
  13     // cs is the current position in the string
  14     const char* cs = value.c_str();
  15     // cn is the position of the next char after the number we just read
  16     char* cn = NULL;
  17
  18     // grab first integer as port. pointer to first non-digit goes in cn
  19     this->port_number = strtol(cs, &cn, 10);
  20     // if cn > cs then strtol read at least one digit
  21     if ((cn > cs) && (port_number <= 4)){
  22         // translate port index into something useful
  23         this->port = gpios[(unsigned int) this->port_number];
  24         // if the char after the first integer is a . then we should expect a pin index next
  25         if (*cn == '.'){
  26             // move pointer to first digit (hopefully) of pin index
  27             cs = ++cn;
  28
  29             // grab pin index.
  30             this->pin = strtol(cs, &cn, 10);
  31
  32             // if strtol read some numbers, cn will point to the first non-digit
  33             if ((cn > cs) && (pin < 32)){
  34                 this->port->FIOMASK &= ~(1 << this->pin);
  35
  36                 // now check for modifiers:-
  37                 // ! = invert pin
  38                 // o = set pin to open drain
  39                 // ^ = set pin to pull up
  40                 // v = set pin to pull down
  41                 // - = set pin to no pull up or down
  42                 // @ = set pin to repeater mode
  43                 for (;*cn;cn++) {
  44                     switch(*cn) {
  45                         case '!':
  46                             this->inverting = true;
  47                             break;
  48                         case 'o':
  49                             as_open_drain();
  50                             break;
  51                         case '^':
  52                             pull_up();
  53                             break;
  54                         case 'v':
  55                             pull_down();
  56                             break;
  57                         case '-':
  58                             pull_none();
  59                             break;
  60                         case '@':
  61                             as_repeater();
  62                             break;
  63                         default:
  64                             // skip any whitespace following the pin index
  65                             if (!is_whitespace(*cn))
  66                                 return this;
  67                     }
  68                 }
  69                 return this;
  70             }
  71         }
  72     }
  73
  74     // from_string failed. TODO: some sort of error
  75     port_number = 0;
  76     port = gpios[0];
  77     pin = 255;
  78     inverting = false;
  79     return this;
  80 }
  81
  82 // Configure this pin as OD
  83 Pin* Pin::as_open_drain(){
  84     if (this->pin >= 32) return this;
  85     if( this->port_number == 0 ){ LPC_PINCON->PINMODE_OD0 |= (1<<this->pin); }
  86     if( this->port_number == 1 ){ LPC_PINCON->PINMODE_OD1 |= (1<<this->pin); }
  87     if( this->port_number == 2 ){ LPC_PINCON->PINMODE_OD2 |= (1<<this->pin); }
  88     if( this->port_number == 3 ){ LPC_PINCON->PINMODE_OD3 |= (1<<this->pin); }
  89     if( this->port_number == 4 ){ LPC_PINCON->PINMODE_OD4 |= (1<<this->pin); }
  90     pull_none(); // no pull up by default
  91     return this;
  92 }
  93
  94
  95 // Configure this pin as a repeater
  96 Pin* Pin::as_repeater(){
  97     if (this->pin >= 32) return this;
  98     // Set the two bits for this pin as 01
  99     if( this->port_number == 0 && this->pin < 16  ){ LPC_PINCON->PINMODE0 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE0 &= ~(2<<( this->pin    *2)); }
 100     if( this->port_number == 0 && this->pin >= 16 ){ LPC_PINCON->PINMODE1 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE1 &= ~(2<<((this->pin-16)*2)); }
 101     if( this->port_number == 1 && this->pin < 16  ){ LPC_PINCON->PINMODE2 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE2 &= ~(2<<( this->pin    *2)); }
 102     if( this->port_number == 1 && this->pin >= 16 ){ LPC_PINCON->PINMODE3 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE3 &= ~(2<<((this->pin-16)*2)); }
 103     if( this->port_number == 2 && this->pin < 16  ){ LPC_PINCON->PINMODE4 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE4 &= ~(2<<( this->pin    *2)); }
 104     if( this->port_number == 3 && this->pin >= 16 ){ LPC_PINCON->PINMODE7 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE7 &= ~(2<<((this->pin-16)*2)); }
 105     if( this->port_number == 4 && this->pin >= 16 ){ LPC_PINCON->PINMODE9 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE9 &= ~(2<<((this->pin-16)*2)); }
 106     return this;
 107 }
 108
 109 // Configure this pin as no pullup or pulldown
 110 Pin* Pin::pull_none(){
 111         if (this->pin >= 32) return this;
 112         // Set the two bits for this pin as 10
 113         if( this->port_number == 0 && this->pin < 16  ){ LPC_PINCON->PINMODE0 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE0 &= ~(1<<( this->pin    *2)); }
 114         if( this->port_number == 0 && this->pin >= 16 ){ LPC_PINCON->PINMODE1 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE1 &= ~(1<<((this->pin-16)*2)); }
 115         if( this->port_number == 1 && this->pin < 16  ){ LPC_PINCON->PINMODE2 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE2 &= ~(1<<( this->pin    *2)); }
 116         if( this->port_number == 1 && this->pin >= 16 ){ LPC_PINCON->PINMODE3 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE3 &= ~(1<<((this->pin-16)*2)); }
 117         if( this->port_number == 2 && this->pin < 16  ){ LPC_PINCON->PINMODE4 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE4 &= ~(1<<( this->pin    *2)); }
 118         if( this->port_number == 3 && this->pin >= 16 ){ LPC_PINCON->PINMODE7 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE7 &= ~(1<<((this->pin-16)*2)); }
 119         if( this->port_number == 4 && this->pin >= 16 ){ LPC_PINCON->PINMODE9 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE9 &= ~(1<<((this->pin-16)*2)); }
 120         return this;
 121 }
 122
 123 // Configure this pin as a pullup
 124 Pin* Pin::pull_up(){
 125     if (this->pin >= 32) return this;
 126     // Set the two bits for this pin as 00
 127     if( this->port_number == 0 && this->pin < 16  ){ LPC_PINCON->PINMODE0 &= ~(3<<( this->pin    *2)); }
 128     if( this->port_number == 0 && this->pin >= 16 ){ LPC_PINCON->PINMODE1 &= ~(3<<((this->pin-16)*2)); }
 129     if( this->port_number == 1 && this->pin < 16  ){ LPC_PINCON->PINMODE2 &= ~(3<<( this->pin    *2)); }
 130     if( this->port_number == 1 && this->pin >= 16 ){ LPC_PINCON->PINMODE3 &= ~(3<<((this->pin-16)*2)); }
 131     if( this->port_number == 2 && this->pin < 16  ){ LPC_PINCON->PINMODE4 &= ~(3<<( this->pin    *2)); }
 132     if( this->port_number == 3 && this->pin >= 16 ){ LPC_PINCON->PINMODE7 &= ~(3<<((this->pin-16)*2)); }
 133     if( this->port_number == 4 && this->pin >= 16 ){ LPC_PINCON->PINMODE9 &= ~(3<<((this->pin-16)*2)); }
 134     return this;
 135 }
 136
 137 // Configure this pin as a pulldown
 138 Pin* Pin::pull_down(){
 139     if (this->pin >= 32) return this;
 140     // Set the two bits for this pin as 11
 141     if( this->port_number == 0 && this->pin < 16  ){ LPC_PINCON->PINMODE0 |= (3<<( this->pin    *2)); }
 142     if( this->port_number == 0 && this->pin >= 16 ){ LPC_PINCON->PINMODE1 |= (3<<((this->pin-16)*2)); }
 143     if( this->port_number == 1 && this->pin < 16  ){ LPC_PINCON->PINMODE2 |= (3<<( this->pin    *2)); }
 144     if( this->port_number == 1 && this->pin >= 16 ){ LPC_PINCON->PINMODE3 |= (3<<((this->pin-16)*2)); }
 145     if( this->port_number == 2 && this->pin < 16  ){ LPC_PINCON->PINMODE4 |= (3<<( this->pin    *2)); }
 146     if( this->port_number == 3 && this->pin >= 16 ){ LPC_PINCON->PINMODE7 |= (3<<((this->pin-16)*2)); }
 147     if( this->port_number == 4 && this->pin >= 16 ){ LPC_PINCON->PINMODE9 |= (3<<((this->pin-16)*2)); }
 148     return this;
 149 }