BUS8.cpp

00001  /* mbed UniGraphic library - BUS8 protocol class
00002  * Copyright (c) 2015 Giuliano Dianda
00003  * Released under the MIT License: http://mbed.org/license/mit
00004  *
00005  * Derived work of:
00006  *
00007  * mbed library for 240*320 pixel display TFT based on ILI9341 LCD Controller
00008  * Copyright (c) 2013 Peter Drescher - DC2PD
00009  *
00010  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00011  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00012  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00013  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00014  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00015  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00016  * THE SOFTWARE.
00017  */
00018  
00019 #include "BUS8.h"
00020 
00021 BUS8::BUS8(PinName* buspins, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD)
00022     : _bus(buspins), _CS(CS), _reset(reset), _DC(DC), _WR(WR), _RD(RD)
00023 {
00024     _reset = 1;
00025     _DC=1;
00026     _WR=1;
00027     _RD=1;
00028     _CS=1;
00029     _bus.mode(PullNone);
00030     _bus.output(); // will re-enable our GPIO port
00031     hw_reset();    
00032 }
00033 
00034 void BUS8::wr_cmd8(unsigned char cmd)
00035 {      
00036     _DC = 0; // 0=cmd
00037     _bus.write(cmd);      // write 8bit
00038     _WR=0;
00039     _WR=1;
00040     _DC = 1; // 1=data next
00041 }
00042 void BUS8::wr_data8(unsigned char data)
00043 {
00044     _bus.write(data);    // write 8bit
00045     _WR=0;
00046     _WR=1;
00047 }
00048 void BUS8::wr_cmd16(unsigned short cmd)
00049 {      
00050     _DC = 0; // 0=cmd
00051     _bus.write(cmd>>8);      // write 8bit
00052     _WR=0;
00053     _WR=1;
00054     _bus.write(cmd&0xFF);      // write 8bit
00055     _WR=0;
00056     _WR=1;
00057     _DC = 1; // 1=data next
00058 }
00059 void BUS8::wr_data16(unsigned short data)
00060 {
00061     _bus.write(data>>8);    // write 8bit
00062     _WR=0;
00063     _WR=1;
00064     _bus.write(data&0xFF);    // write 8bit
00065     _WR=0;
00066     _WR=1;
00067 }
00068 void BUS8::wr_gram(unsigned short data)
00069 {
00070     _bus.write(data>>8);    // write 8bit
00071     _WR=0;
00072     _WR=1;
00073     _bus.write(data&0xFF);    // write 8bit
00074     _WR=0;
00075     _WR=1;
00076 }
00077 void BUS8::wr_gram(unsigned short data, unsigned int count)
00078 {
00079     if((data>>8)==(data&0xFF))
00080     {
00081         count<<=1;
00082       //  _bus.write(data);    // write 8bit
00083         while(count)
00084         {
00085             _bus.write(data);    // rewrite even if same data, otherwise too much fast
00086             _WR=0;
00087             _WR=1;
00088             count--;
00089         }
00090     }
00091     else
00092     {
00093         while(count)
00094         {
00095             _bus.write(data>>8);    // write 8bit
00096             _WR=0;
00097             _WR=1;
00098             _bus.write(data&0xFF);    // write 8bit
00099             _WR=0;
00100             _WR=1;
00101             count--;
00102         }
00103     }
00104 }
00105 void BUS8::wr_grambuf(unsigned short* data, unsigned int lenght)
00106 {
00107     while(lenght)
00108     {
00109         _bus.write((*data)>>8);    // write 8bit
00110         _WR=0;
00111         _WR=1;
00112         _bus.write((*data)&0xFF);    // write 8bit
00113         _WR=0;
00114         _WR=1;
00115         data++;
00116         lenght--;
00117     }
00118 }
00119 unsigned short BUS8::rd_gram(bool convert)
00120 {
00121     unsigned int r=0;
00122    _bus.input();
00123    
00124     _RD = 0;
00125     _RD = 0; // add wait
00126     _bus.read(); //dummy read
00127     _RD = 1;
00128     
00129     _RD = 0;
00130     _RD = 0; // add wait
00131     r |= _bus.read();
00132     _RD = 1;
00133     r <<= 8;
00134     
00135     _RD = 0;
00136     _RD = 0; // add wait
00137     r |= _bus.read();
00138     _RD = 1;
00139     if(convert)
00140     {
00141         r <<= 8;
00142         _RD = 0;
00143   //      _RD = 0; // add wait
00144         r |= _bus.read();
00145         _RD = 1;
00146         // gram is 18bit/pixel, if you set 16bit/pixel (cmd 3A), during writing the 16bits are expanded to 18bit
00147         // during reading, you read the raw 18bit gram
00148         r = RGB24to16((r&0xFF0000)>>16, (r&0xFF00)>>8, r&0xFF);// 18bit pixel padded to 24bits, rrrrrr00_gggggg00_bbbbbb00, converted to 16bit
00149     }
00150     _bus.output();
00151     return (unsigned short)r;
00152 }
00153 unsigned int BUS8::rd_reg_data32(unsigned char reg)
00154 {
00155     wr_cmd8(reg);
00156     unsigned int r=0;
00157    _bus.input();
00158    
00159     _RD = 0;
00160     _bus.read(); //dummy read
00161     _RD = 1;
00162     
00163     _RD = 0;
00164  //   _RD = 0; // add wait
00165     r |= (_bus.read()&0xFF);
00166     r <<= 8;
00167     _RD = 1;
00168     
00169     _RD = 0;
00170  //   _RD = 0; // add wait
00171     r |= (_bus.read()&0xFF);
00172     r <<= 8;
00173     _RD = 1;
00174     
00175     _RD = 0;
00176 //    _RD = 0; // add wait
00177     r |= (_bus.read()&0xFF);
00178     r <<= 8;
00179     _RD = 1;
00180     
00181     _RD = 0;
00182  //   _RD = 0; // add wait
00183     r |= (_bus.read()&0xFF);
00184     _RD = 1;
00185     
00186     _CS = 1; // force CS HIG to interupt the cmd in case was not supported
00187     _CS = 0;
00188     _bus.output();
00189     return r;
00190 }
00191 // in Par mode EXTC regs (0xB0-0xFF) can be directly read
00192 unsigned int BUS8::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd)
00193 {
00194     return rd_reg_data32(reg);
00195 }
00196 // ILI932x specific
00197 void BUS8::dummyread()
00198 {
00199     _bus.input();
00200     _RD=0;
00201     _RD=0; // add wait
00202     _bus.read();    // dummy read
00203     _RD=1;
00204  //   _bus.output();
00205 }
00206 // ILI932x specific
00207 void BUS8::reg_select(unsigned char reg, bool forread)
00208 {
00209     _DC = 0;
00210     _bus.write(0);    // write MSB
00211     _WR=0;
00212     _WR=1;
00213     _bus.write(reg);    // write LSB
00214     _WR=0;
00215     _WR=1;
00216     _DC = 1; // 1=data next
00217 }
00218 // ILI932x specific
00219 void BUS8::reg_write(unsigned char reg, unsigned short data)
00220 {
00221     _DC = 0;
00222     _bus.write(0);    // write MSB
00223     _WR=0;
00224     _WR=1;
00225     _bus.write(reg);    // write MSB
00226     _WR=0;
00227     _WR=1;
00228     _DC = 1;
00229     _bus.write(data>>8);
00230     _WR=0;
00231     _WR=1;
00232     _bus.write(data&0xFF);
00233     _WR=0;
00234     _WR=1;
00235 }
00236 // ILI932x specific
00237 unsigned short BUS8::reg_read(unsigned char reg)
00238 {
00239     unsigned short r=0;
00240     _DC = 0;
00241     _bus.write(0);
00242     _WR=0;
00243     _WR=1;
00244     _bus.write(reg);
00245     _WR=0;
00246     _WR=1;
00247     _DC = 1;
00248     _bus.input();
00249     _RD=0;
00250     r |= _bus.read();    // read 8bit
00251     _RD=1;
00252     r <<= 8;
00253     _RD=0;
00254     r |= _bus.read();    // read 8bit
00255     _RD=1;
00256     _bus.output();
00257     
00258     return r;
00259 }
00260 void BUS8::hw_reset()
00261 {
00262     wait_ms(15);
00263     _DC = 1;
00264     _CS = 1;
00265     _WR = 1;
00266     _RD = 1;
00267     _reset = 0;                        // display reset
00268     wait_ms(2);
00269     _reset = 1;                       // end reset
00270     wait_ms(100);
00271 }
00272 void BUS8::BusEnable(bool enable)
00273 {
00274     _CS = enable ? 0:1;
00275 }