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