src/libs/Pin.cpp

   1 #include "Pin.h"
   2 #include "utils.h"
   3
   4 // mbed libraries for hardware pwm
   5 #include "PwmOut.h"
   6 #include "InterruptIn.h"
   7 #include "PinNames.h"
   8 #include "port_api.h"
   9
  10 Pin::Pin(){
  11     this->inverting= false;
  12     this->valid= false;
  13     this->pin= 32;
  14     this->port= nullptr;
  15 }
  16
  17 // Make a new pin object from a string
  18 Pin* Pin::from_string(std::string value){
  19     LPC_GPIO_TypeDef* gpios[5] ={LPC_GPIO0,LPC_GPIO1,LPC_GPIO2,LPC_GPIO3,LPC_GPIO4};
  20
  21     // cs is the current position in the string
  22     const char* cs = value.c_str();
  23     // cn is the position of the next char after the number we just read
  24     char* cn = NULL;
  25     valid= true;
  26
  27     // grab first integer as port. pointer to first non-digit goes in cn
  28     this->port_number = strtol(cs, &cn, 10);
  29     // if cn > cs then strtol read at least one digit
  30     if ((cn > cs) && (port_number <= 4)){
  31         // translate port index into something useful
  32         this->port = gpios[(unsigned int) this->port_number];
  33         // if the char after the first integer is a . then we should expect a pin index next
  34         if (*cn == '.'){
  35             // move pointer to first digit (hopefully) of pin index
  36             cs = ++cn;
  37
  38             // grab pin index.
  39             this->pin = strtol(cs, &cn, 10);
  40
  41             // if strtol read some numbers, cn will point to the first non-digit
  42             if ((cn > cs) && (pin < 32)){
  43                 this->port->FIOMASK &= ~(1 << this->pin);
  44
  45                 // now check for modifiers:-
  46                 // ! = invert pin
  47                 // o = set pin to open drain
  48                 // ^ = set pin to pull up
  49                 // v = set pin to pull down
  50                 // - = set pin to no pull up or down
  51                 // @ = set pin to repeater mode
  52                 for (;*cn;cn++) {
  53                     switch(*cn) {
  54                         case '!':
  55                             this->inverting = true;
  56                             break;
  57                         case 'o':
  58                             as_open_drain();
  59                             break;
  60                         case '^':
  61                             pull_up();
  62                             break;
  63                         case 'v':
  64                             pull_down();
  65                             break;
  66                         case '-':
  67                             pull_none();
  68                             break;
  69                         case '@':
  70                             as_repeater();
  71                             break;
  72                         default:
  73                             // skip any whitespace following the pin index
  74                             if (!is_whitespace(*cn))
  75                                 return this;
  76                     }
  77                 }
  78                 return this;
  79             }
  80         }
  81     }
  82
  83     // from_string failed. TODO: some sort of error
  84     valid= false;
  85     port_number = 0;
  86     port = gpios[0];
  87     pin = 32;
  88     inverting = false;
  89     return this;
  90 }
  91
  92 // Configure this pin as OD
  93 Pin* Pin::as_open_drain(){
  94     if (!this->valid) return this;
  95     if( this->port_number == 0 ){ LPC_PINCON->PINMODE_OD0 |= (1<<this->pin); }
  96     if( this->port_number == 1 ){ LPC_PINCON->PINMODE_OD1 |= (1<<this->pin); }
  97     if( this->port_number == 2 ){ LPC_PINCON->PINMODE_OD2 |= (1<<this->pin); }
  98     if( this->port_number == 3 ){ LPC_PINCON->PINMODE_OD3 |= (1<<this->pin); }
  99     if( this->port_number == 4 ){ LPC_PINCON->PINMODE_OD4 |= (1<<this->pin); }
 100     pull_none(); // no pull up by default
 101     return this;
 102 }
 103
 104
 105 // Configure this pin as a repeater
 106 Pin* Pin::as_repeater(){
 107     if (!this->valid) return this;
 108     // Set the two bits for this pin as 01
 109     if( this->port_number == 0 && this->pin < 16  ){ LPC_PINCON->PINMODE0 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE0 &= ~(2<<( this->pin    *2)); }
 110     if( this->port_number == 0 && this->pin >= 16 ){ LPC_PINCON->PINMODE1 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE1 &= ~(2<<((this->pin-16)*2)); }
 111     if( this->port_number == 1 && this->pin < 16  ){ LPC_PINCON->PINMODE2 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE2 &= ~(2<<( this->pin    *2)); }
 112     if( this->port_number == 1 && this->pin >= 16 ){ LPC_PINCON->PINMODE3 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE3 &= ~(2<<((this->pin-16)*2)); }
 113     if( this->port_number == 2 && this->pin < 16  ){ LPC_PINCON->PINMODE4 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE4 &= ~(2<<( this->pin    *2)); }
 114     if( this->port_number == 3 && this->pin >= 16 ){ LPC_PINCON->PINMODE7 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE7 &= ~(2<<((this->pin-16)*2)); }
 115     if( this->port_number == 4 && this->pin >= 16 ){ LPC_PINCON->PINMODE9 |= (1<<( this->pin*2)); LPC_PINCON->PINMODE9 &= ~(2<<((this->pin-16)*2)); }
 116     return this;
 117 }
 118
 119 // Configure this pin as no pullup or pulldown
 120 Pin* Pin::pull_none(){
 121         if (!this->valid) return this;
 122         // Set the two bits for this pin as 10
 123         if( this->port_number == 0 && this->pin < 16  ){ LPC_PINCON->PINMODE0 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE0 &= ~(1<<( this->pin    *2)); }
 124         if( this->port_number == 0 && this->pin >= 16 ){ LPC_PINCON->PINMODE1 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE1 &= ~(1<<((this->pin-16)*2)); }
 125         if( this->port_number == 1 && this->pin < 16  ){ LPC_PINCON->PINMODE2 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE2 &= ~(1<<( this->pin    *2)); }
 126         if( this->port_number == 1 && this->pin >= 16 ){ LPC_PINCON->PINMODE3 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE3 &= ~(1<<((this->pin-16)*2)); }
 127         if( this->port_number == 2 && this->pin < 16  ){ LPC_PINCON->PINMODE4 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE4 &= ~(1<<( this->pin    *2)); }
 128         if( this->port_number == 3 && this->pin >= 16 ){ LPC_PINCON->PINMODE7 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE7 &= ~(1<<((this->pin-16)*2)); }
 129         if( this->port_number == 4 && this->pin >= 16 ){ LPC_PINCON->PINMODE9 |= (2<<( this->pin*2)); LPC_PINCON->PINMODE9 &= ~(1<<((this->pin-16)*2)); }
 130         return this;
 131 }
 132
 133 // Configure this pin as a pullup
 134 Pin* Pin::pull_up(){
 135     if (!this->valid) return this;
 136     // Set the two bits for this pin as 00
 137     if( this->port_number == 0 && this->pin < 16  ){ LPC_PINCON->PINMODE0 &= ~(3<<( this->pin    *2)); }
 138     if( this->port_number == 0 && this->pin >= 16 ){ LPC_PINCON->PINMODE1 &= ~(3<<((this->pin-16)*2)); }
 139     if( this->port_number == 1 && this->pin < 16  ){ LPC_PINCON->PINMODE2 &= ~(3<<( this->pin    *2)); }
 140     if( this->port_number == 1 && this->pin >= 16 ){ LPC_PINCON->PINMODE3 &= ~(3<<((this->pin-16)*2)); }
 141     if( this->port_number == 2 && this->pin < 16  ){ LPC_PINCON->PINMODE4 &= ~(3<<( this->pin    *2)); }
 142     if( this->port_number == 3 && this->pin >= 16 ){ LPC_PINCON->PINMODE7 &= ~(3<<((this->pin-16)*2)); }
 143     if( this->port_number == 4 && this->pin >= 16 ){ LPC_PINCON->PINMODE9 &= ~(3<<((this->pin-16)*2)); }
 144     return this;
 145 }
 146
 147 // Configure this pin as a pulldown
 148 Pin* Pin::pull_down(){
 149     if (!this->valid) return this;
 150     // Set the two bits for this pin as 11
 151     if( this->port_number == 0 && this->pin < 16  ){ LPC_PINCON->PINMODE0 |= (3<<( this->pin    *2)); }
 152     if( this->port_number == 0 && this->pin >= 16 ){ LPC_PINCON->PINMODE1 |= (3<<((this->pin-16)*2)); }
 153     if( this->port_number == 1 && this->pin < 16  ){ LPC_PINCON->PINMODE2 |= (3<<( this->pin    *2)); }
 154     if( this->port_number == 1 && this->pin >= 16 ){ LPC_PINCON->PINMODE3 |= (3<<((this->pin-16)*2)); }
 155     if( this->port_number == 2 && this->pin < 16  ){ LPC_PINCON->PINMODE4 |= (3<<( this->pin    *2)); }
 156     if( this->port_number == 3 && this->pin >= 16 ){ LPC_PINCON->PINMODE7 |= (3<<((this->pin-16)*2)); }
 157     if( this->port_number == 4 && this->pin >= 16 ){ LPC_PINCON->PINMODE9 |= (3<<((this->pin-16)*2)); }
 158     return this;
 159 }
 160
 161 // If available on this pin, return mbed hardware pwm class for this pin
 162 mbed::PwmOut* Pin::hardware_pwm()
 163 {
 164     if (port_number == 1)
 165     {
 166         if (pin == 18) { return new mbed::PwmOut(P1_18); }
 167         if (pin == 20) { return new mbed::PwmOut(P1_20); }
 168         if (pin == 21) { return new mbed::PwmOut(P1_21); }
 169         if (pin == 23) { return new mbed::PwmOut(P1_23); }
 170         if (pin == 24) { return new mbed::PwmOut(P1_24); }
 171         if (pin == 26) { return new mbed::PwmOut(P1_26); }
 172     }
 173     else if (port_number == 2)
 174     {
 175         if (pin == 0) { return new mbed::PwmOut(P2_0); }
 176         if (pin == 1) { return new mbed::PwmOut(P2_1); }
 177         if (pin == 2) { return new mbed::PwmOut(P2_2); }
 178         if (pin == 3) { return new mbed::PwmOut(P2_3); }
 179         if (pin == 4) { return new mbed::PwmOut(P2_4); }
 180         if (pin == 5) { return new mbed::PwmOut(P2_5); }
 181     }
 182     else if (port_number == 3)
 183     {
 184         if (pin == 25) { return new mbed::PwmOut(P3_25); }
 185         if (pin == 26) { return new mbed::PwmOut(P3_26); }
 186     }
 187     return nullptr;
 188 }
 189
 190 mbed::InterruptIn* Pin::interrupt_pin()
 191 {
 192     if(!this->valid) return nullptr;
 193
 194     // set as input
 195     as_input();
 196
 197     if (port_number == 0 || port_number == 2) {
 198         PinName pinname = port_pin((PortName)port_number, pin);
 199         return new mbed::InterruptIn(pinname);
 200
 201     }else{
 202         this->valid= false;
 203         return nullptr;
 204     }
 205 }