SHT21_I2C.h

00001 /*
00002     Copyright (c) 2010 Andy Kirkham
00003  
00004     Permission is hereby granted, free of charge, to any person obtaining a copy
00005     of this software and associated documentation files (the "Software"), to deal
00006     in the Software without restriction, including without limitation the rights
00007     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008     copies of the Software, and to permit persons to whom the Software is
00009     furnished to do so, subject to the following conditions:
00010  
00011     The above copyright notice and this permission notice shall be included in
00012     all copies or substantial portions of the Software.
00013  
00014     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017     AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020     THE SOFTWARE.
00021 */
00022 
00023 #include "mbed.h"
00024 
00025 #ifndef SHT21_I2C_H
00026 #define SHT21_I2C_H
00027 
00028 class SHT_I2C : public I2C {
00029 
00030 protected:
00031     PinName _scl;
00032     PinName _sda;
00033     
00034 public:
00035 
00036     SHT_I2C(PinName sda, PinName scl, const char *name = NULL) : I2C(sda, scl, name) {
00037         _sda = sda;
00038         _scl = scl;
00039     }
00040     
00041     void sclAsInput(void) {
00042         switch(_scl) {
00043             case p10:
00044                 LPC_PINCON->PINSEL0 &= ~(3UL << 2); // p10, P0.1 as GPIO
00045                 LPC_GPIO0->FIODIR &= ~(1UL << 1);   // p10, P0.1 as Input
00046                 break;
00047             case p27:
00048                 LPC_PINCON->PINSEL0&=~(3UL << 22);  // p27, P0.11 as GPIO
00049                 LPC_GPIO0->FIODIR &= ~(1UL << 11);  // p27, P0.11 as input
00050                 break;                
00051         }
00052     }
00053     
00054     int sclRead(void) {
00055         switch(_scl) {
00056             case p10: return (LPC_GPIO0->FIOPIN & (1UL <<  1)) ? 1 : 0;
00057             case p27: return (LPC_GPIO0->FIOPIN & (1UL << 11)) ? 1 : 0;                
00058             default:
00059                 return 0;
00060         }
00061     }
00062     
00063     void sclNormal(void) {
00064         switch(_scl) {
00065             case p10:
00066                 LPC_PINCON->PINSEL0 &= ~(3UL << 2); // p10, P0.1 as I2C SCL1
00067                 LPC_PINCON->PINSEL0 |=  (3UL << 2);
00068                 break;
00069             case p27:
00070                 LPC_PINCON->PINSEL0 &= ~(3UL << 22); // p27, P0.11 as I2C SCL2
00071                 LPC_PINCON->PINSEL0 |=  (2UL << 22);            
00072                 break;                
00073         }
00074     }
00075 
00076 };
00077 
00078 #endif