PAR8.cpp

00001  /* mbed UniGraphic library - PAR8 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 #include "platform.h" 
00019 #if DEVICE_PORTINOUT 
00020  
00021 #include "PAR8.h"
00022 
00023 PAR8::PAR8(PortName port, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD)
00024     : _port(port,0xFF), _CS(CS), _reset(reset), _DC(DC), _WR(WR), _RD(RD)
00025 {
00026     _reset = 1;
00027     _DC=1;
00028     _WR=1;
00029     _RD=1;
00030     _CS=1;
00031     _port.mode(PullNone);
00032     _port.output(); // will re-enable our GPIO port
00033     hw_reset();    
00034 }
00035 
00036 void PAR8::wr_cmd8(unsigned char cmd)
00037 {      
00038     _DC = 0; // 0=cmd
00039     _port.write(cmd);      // write 8bit
00040     _WR=0;
00041     _WR=1;
00042     _DC = 1; // 1=data next
00043 }
00044 void PAR8::wr_data8(unsigned char data)
00045 {
00046     _port.write(data);    // write 8bit
00047     _WR=0;
00048     _WR=1;
00049 }
00050 void PAR8::wr_cmd16(unsigned short cmd)
00051 {      
00052     _DC = 0; // 0=cmd
00053     _port.write(cmd>>8);      // write 8bit
00054     _WR=0;
00055     _WR=1;
00056     _port.write(cmd&0xFF);      // write 8bit
00057     _WR=0;
00058     _WR=1;
00059     _DC = 1; // 1=data next
00060 }
00061 void PAR8::wr_data16(unsigned short data)
00062 {
00063     _port.write(data>>8);    // write 8bit
00064     _WR=0;
00065     _WR=1;
00066     _port.write(data&0xFF);    // write 8bit
00067     _WR=0;
00068     _WR=1;
00069 }
00070 void PAR8::wr_gram(unsigned short data)
00071 {
00072     _port.write(data>>8);    // write 8bit
00073     _WR=0;
00074     _WR=1;
00075     _port.write(data&0xFF);    // write 8bit
00076     _WR=0;
00077     _WR=1;
00078 }
00079 void PAR8::wr_gram(unsigned short data, unsigned int count)
00080 {
00081     if((data>>8)==(data&0xFF))
00082     {
00083         count<<=1;
00084       //  _port.write(data);    // write 8bit
00085         while(count)
00086         {
00087             _port.write(data);    // rewrite even if same data, otherwise too much fast
00088             _WR=0;
00089             _WR=1;
00090             count--;
00091         }
00092     }
00093     else
00094     {
00095         while(count)
00096         {
00097             _port.write(data>>8);    // write 8bit
00098             _WR=0;
00099             _WR=1;
00100             _port.write(data&0xFF);    // write 8bit
00101             _WR=0;
00102             _WR=1;
00103             count--;
00104         }
00105     }
00106 }
00107 void PAR8::wr_grambuf(unsigned short* data, unsigned int lenght)
00108 {
00109     while(lenght)
00110     {
00111         _port.write((*data)>>8);    // write 8bit
00112         _WR=0;
00113         _WR=1;
00114         _port.write((*data)&0xFF);    // write 8bit
00115         _WR=0;
00116         _WR=1;
00117         data++;
00118         lenght--;
00119     }
00120 }
00121 unsigned short PAR8::rd_gram(bool convert)
00122 {
00123     unsigned int r=0;
00124    _port.input();
00125    
00126     _RD = 0;
00127     _RD = 0; // add wait
00128     _port.read(); //dummy read
00129     _RD = 1;
00130     
00131     _RD = 0;
00132     _RD = 0; // add wait
00133     r |= _port.read();
00134     _RD = 1;
00135     r <<= 8;
00136     
00137     _RD = 0;
00138     _RD = 0; // add wait
00139     r |= _port.read();
00140     _RD = 1;
00141     if(convert)
00142     {
00143         r <<= 8;
00144         _RD = 0;
00145   //      _RD = 0; // add wait
00146         r |= _port.read();
00147         _RD = 1;
00148         // gram is 18bit/pixel, if you set 16bit/pixel (cmd 3A), during writing the 16bits are expanded to 18bit
00149         // during reading, you read the raw 18bit gram
00150         r = RGB24to16((r&0xFF0000)>>16, (r&0xFF00)>>8, r&0xFF);// 18bit pixel padded to 24bits, rrrrrr00_gggggg00_bbbbbb00, converted to 16bit
00151     }
00152     _port.output();
00153     return (unsigned short)r;
00154 }
00155 unsigned int PAR8::rd_reg_data32(unsigned char reg)
00156 {
00157     wr_cmd8(reg);
00158     unsigned int r=0;
00159    _port.input();
00160    
00161     _RD = 0;
00162     _port.read(); //dummy read
00163     _RD = 1;
00164     
00165     _RD = 0;
00166  //   _RD = 0; // add wait
00167     r |= (_port.read()&0xFF);
00168     r <<= 8;
00169     _RD = 1;
00170     
00171     _RD = 0;
00172  //   _RD = 0; // add wait
00173     r |= (_port.read()&0xFF);
00174     r <<= 8;
00175     _RD = 1;
00176     
00177     _RD = 0;
00178 //    _RD = 0; // add wait
00179     r |= (_port.read()&0xFF);
00180     r <<= 8;
00181     _RD = 1;
00182     
00183     _RD = 0;
00184  //   _RD = 0; // add wait
00185     r |= (_port.read()&0xFF);
00186     _RD = 1;
00187     
00188     _CS = 1; // force CS HIG to interupt the cmd in case was not supported
00189     _CS = 0;
00190     _port.output();
00191     return r;
00192 }
00193 // in Par mode EXTC regs (0xB0-0xFF) can be directly read
00194 unsigned int PAR8::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd)
00195 {
00196     return rd_reg_data32(reg);
00197 }
00198 // ILI932x specific
00199 void PAR8::dummyread()
00200 {
00201     _port.input();
00202     _RD=0;
00203     _RD=0; // add wait
00204     _port.read();    // dummy read
00205     _RD=1;
00206  //   _port.output();
00207 }
00208 // ILI932x specific
00209 void PAR8::reg_select(unsigned char reg, bool forread)
00210 {
00211     _DC = 0;
00212     _port.write(0);    // write MSB
00213     _WR=0;
00214     _WR=1;
00215     _port.write(reg);    // write LSB
00216     _WR=0;
00217     _WR=1;
00218     _DC = 1; // 1=data next
00219 }
00220 // ILI932x specific
00221 void PAR8::reg_write(unsigned char reg, unsigned short data)
00222 {
00223     _DC = 0;
00224     _port.write(0);    // write MSB
00225     _WR=0;
00226     _WR=1;
00227     _port.write(reg);    // write MSB
00228     _WR=0;
00229     _WR=1;
00230     _DC = 1;
00231     _port.write(data>>8);
00232     _WR=0;
00233     _WR=1;
00234     _port.write(data&0xFF);
00235     _WR=0;
00236     _WR=1;
00237 }
00238 // ILI932x specific
00239 unsigned short PAR8::reg_read(unsigned char reg)
00240 {
00241     unsigned short r=0;
00242     _DC = 0;
00243     _port.write(0);
00244     _WR=0;
00245     _WR=1;
00246     _port.write(reg);
00247     _WR=0;
00248     _WR=1;
00249     _DC = 1;
00250     _port.input();
00251     _RD=0;
00252     r |= _port.read();    // read 8bit
00253     _RD=1;
00254     r <<= 8;
00255     _RD=0;
00256     r |= _port.read();    // read 8bit
00257     _RD=1;
00258     _port.output();
00259     
00260     return r;
00261 }
00262 void PAR8::hw_reset()
00263 {
00264     wait_ms(15);
00265     _DC = 1;
00266     _CS = 1;
00267     _WR = 1;
00268     _RD = 1;
00269     _reset = 0;                        // display reset
00270     wait_ms(2);
00271     _reset = 1;                       // end reset
00272     wait_ms(100);
00273 }
00274 void PAR8::BusEnable(bool enable)
00275 {
00276     _CS = enable ? 0:1;
00277 }
00278 
00279 #endif