I2C_bus.cpp

00001 /* mbed UniGraphic library - I2C protocol class
00002  * Copyright (c) 2017 Peter Drescher
00003  * Released under the MIT License: http://mbed.org/license/mit
00004  *
00005  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00006  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00007  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00008  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00009  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00010  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00011  * THE SOFTWARE.
00012  */
00013  
00014 #include "I2C_bus.h"
00015 
00016 I2C_bus::I2C_bus(int Hz, int address, PinName sda, PinName scl)
00017     : _i2c(sda,scl)
00018 {
00019     _i2c.frequency(Hz);
00020     _address = address;
00021     //hw_reset();    
00022 }
00023 
00024 void I2C_bus::wr_cmd8(unsigned char cmd)
00025 {     
00026     char tmp[2];
00027     tmp[0] = 0x00;  //command 
00028     tmp[1] = cmd;
00029     _i2c.write(_address,tmp,2);
00030 }
00031 void I2C_bus::wr_data8(unsigned char data)
00032 {
00033     _i2c.write(data);    // write 8bit
00034 }
00035 void I2C_bus::wr_cmd16(unsigned short cmd)
00036 {     
00037     char tmp[3];
00038     tmp[0] = 00; //command
00039     tmp[1] = cmd>>8;
00040     tmp[2] = cmd&0xFF;
00041     
00042     _i2c.write(_address,tmp,3);
00043 }
00044 void I2C_bus::wr_data16(unsigned short data)
00045 {
00046     _i2c.write(data>>8);    // write 8bit
00047     _i2c.write(data&0xFF);    // write 8bit
00048 }
00049 void I2C_bus::wr_gram(unsigned short data)
00050 {
00051     _i2c.write(data>>8);    // write 8bit
00052     _i2c.write(data&0xFF);    // write 8bit
00053 }
00054 void I2C_bus::wr_gram(unsigned short data, unsigned int count)
00055 {
00056     _i2c.start();
00057     _i2c.write(_address);
00058     _i2c.write(0x40);          // data continue
00059     if((data>>8)==(data&0xFF))
00060     {
00061         count<<=1;
00062         while(count)
00063         {
00064             _i2c.write(data);    // write 8bit
00065             count--;
00066         }
00067     }
00068     else
00069     {
00070         while(count)
00071         {
00072             _i2c.write(data>>8);    // write 8bit
00073             _i2c.write(data&0xFF);    // write 8bit
00074             count--;
00075         }
00076     }
00077    _i2c.stop();
00078 }
00079 void I2C_bus::wr_grambuf(unsigned short* data, unsigned int lenght)
00080 {
00081     _i2c.start();
00082     _i2c.write(_address);
00083     _i2c.write(0x40);          // data continue
00084     while(lenght)
00085     {
00086         _i2c.write((*data)>>8);    // write 8bit
00087         _i2c.write((*data)&0xFF);    // write 8bit
00088         data++;
00089         lenght--;
00090     }
00091     _i2c.stop();
00092 }
00093 
00094 void I2C_bus::hw_reset()
00095 {
00096     
00097 }
00098 void I2C_bus::BusEnable(bool enable)
00099 {
00100 }
00101 
00102 void I2C_bus::reg_select(unsigned char reg, bool forread)
00103 {    
00104 }
00105 
00106 unsigned int I2C_bus::rd_reg_data32(unsigned char reg)
00107 {
00108      return 0;
00109 }
00110 
00111 unsigned int I2C_bus::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd)
00112 {
00113     return 0;
00114 }
00115 
00116 void I2C_bus::dummyread()
00117 {
00118 }
00119 
00120 unsigned short I2C_bus::rd_gram(bool convert)
00121 {
00122     return (0);    
00123 }
00124 
00125 unsigned short I2C_bus::reg_read(unsigned char reg)
00126 {
00127     return (0);
00128 }
00129 
00130 void I2C_bus::reg_write(unsigned char reg, unsigned short data)
00131 {
00132 }