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  
00019 #include "PAR8.h"
00020 
00021 PAR8::PAR8(PortName port, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD)
00022     : _port(port,0xFF), _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 #ifdef STMPORTDEBUG
00030     findport(port); //on return, GPIO get disabled
00031 #endif
00032     _port.mode(PullNone);
00033     _port.output(); // will re-enable our GPIO port
00034     hw_reset();    
00035 }
00036 
00037 #ifdef STMPORTDEBUG
00038 // create a port obj with STM HAL drivers, just to collect memorymapped regs
00039 void PAR8::findport(PortName port)
00040 {
00041     port_t tempport;
00042     port_init(&tempport, port, 0xFF, PIN_INPUT);
00043     outreg = tempport.reg_out;
00044     inreg = tempport.reg_in;
00045  //   debug("out 0x%.8X  in 0x%.8X\r\n", outreg, inreg);
00046 }
00047 #endif
00048 void PAR8::wr_cmd8(unsigned char cmd)
00049 {   
00050 #ifdef USE_CS
00051     _CS = 0;
00052 #endif    
00053     _DC = 0; // 0=cmd
00054     _WR=0;
00055     _port.write(cmd);      // write 8bit
00056     _WR=1;
00057 #ifdef USE_CS
00058     _CS = 1;
00059 #endif
00060 }
00061 void PAR8::wr_data8(unsigned char data)
00062 {
00063 #ifdef USE_CS
00064     _CS = 0;
00065 #endif
00066     _DC = 1; // 1=data
00067     _WR=0;
00068     _port.write(data);    // write 8bit
00069     _WR=1;
00070 #ifdef USE_CS
00071     _CS = 1;
00072 #endif
00073 }
00074 void PAR8::wr_cmd16(unsigned short cmd)
00075 {   
00076 #ifdef USE_CS
00077     _CS = 0;
00078 #endif    
00079     _DC = 0; // 0=cmd
00080     _WR=0;
00081     _port.write(cmd>>8);      // write 8bit
00082     _WR=1;
00083     _WR=0;
00084     _port.write(cmd&0xFF);      // write 8bit
00085     _WR=1;
00086 #ifdef USE_CS
00087     _CS = 1;
00088 #endif
00089 }
00090 void PAR8::wr_data16(unsigned short data)
00091 {
00092 #ifdef USE_CS
00093     _CS = 0;
00094 #endif
00095     _DC = 1; // 1=data
00096     _WR=0;
00097     _port.write(data>>8);    // write 8bit
00098     _WR=1;
00099     _WR=0;
00100     _port.write(data&0xFF);    // write 8bit
00101     _WR=1;
00102 #ifdef USE_CS
00103     _CS = 1;
00104 #endif
00105 }
00106 void PAR8::wr_gram(unsigned short data)
00107 {
00108 #ifdef USE_CS
00109     _CS = 0;
00110 #endif
00111     _DC = 1; // 1=data
00112     _WR=0;
00113     _port.write(data>>8);    // write 8bit
00114     _WR=1;
00115     _WR=0;
00116     _port.write(data&0xFF);    // write 8bit
00117     _WR=1;
00118 #ifdef USE_CS
00119     _CS = 1;
00120 #endif
00121 }
00122 void PAR8::wr_gram(unsigned short data, unsigned int count)
00123 {
00124 #ifdef USE_CS
00125     _CS = 0;
00126 #endif
00127     _DC = 1; // 1=data
00128     if((data>>8)==(data&0xFF))
00129     {
00130         count<<=1;
00131         _port.write(data);    // write 8bit
00132         while(count)
00133         {
00134             _WR=0;
00135             _WR=1;
00136             count--;
00137         }
00138     }
00139     else
00140     {
00141         while(count)
00142         {
00143             _WR=0;
00144             _port.write(data>>8);    // write 8bit
00145             _WR=1;
00146             _WR=0;
00147             _port.write(data&0xFF);    // write 8bit
00148             _WR=1;
00149             count--;
00150         }
00151     }
00152 #ifdef USE_CS
00153     _CS = 1;
00154 #endif
00155 }
00156 void PAR8::wr_grambuf(unsigned short* data, unsigned int lenght)
00157 {
00158 #ifdef USE_CS
00159     _CS = 0;
00160 #endif
00161     _DC = 1; // 1=data
00162     while(lenght)
00163     {
00164         _WR=0;
00165         _port.write((*data)>>8);    // write 8bit
00166         _WR=1;
00167         _WR=0;
00168         _port.write((*data)&0xFF);    // write 8bit
00169         _WR=1;
00170         data++;
00171         lenght--;
00172     }
00173 #ifdef USE_CS
00174     _CS = 1;
00175 #endif
00176 }
00177 unsigned short PAR8::rd_gram(bool convert)
00178 {
00179 #ifdef USE_CS
00180     _CS = 0;
00181 #endif
00182     unsigned int r=0;
00183     _DC = 1; // 1=data
00184    _port.input();
00185    
00186     _RD = 0;
00187     _port.read(); //dummy read
00188     _RD = 1;
00189     
00190     _RD = 0;
00191 //    _RD = 0; // add wait
00192     r |= (_port.read()&0xFF);
00193     r <<= 8;
00194     _RD = 1;
00195     
00196     _RD = 0;
00197 //    _RD = 0; // add wait
00198     r |= (_port.read()&0xFF);
00199     _RD = 1;
00200     if(convert)
00201     {
00202         r <<= 8;
00203         _RD = 0;
00204   //      _RD = 0; // add wait
00205         r |= _port.read();
00206         _RD = 1;
00207         // gram is 18bit/pixel, if you set 16bit/pixel (cmd 3A), during writing the 16bits are expanded to 18bit
00208         // during reading, you read the raw 18bit gram
00209         r = RGB24to16((r&0xFF0000)>>16, (r&0xFF00)>>8, r&0xFF);// 18bit pixel padded to 24bits, rrrrrr00_gggggg00_bbbbbb00, converted to 16bit
00210     }
00211 #ifdef USE_CS
00212     _CS = 1;
00213 #endif
00214     _port.output();
00215     return (unsigned short)r;
00216 }
00217 unsigned int PAR8::rd_reg_data32(unsigned char reg)
00218 {
00219 #ifdef USE_CS
00220     _CS = 0;
00221 #endif
00222     wr_cmd8(reg);
00223     unsigned int r=0;
00224     _DC = 1; // 1=data
00225    _port.input();
00226    
00227     _RD = 0;
00228     _port.read(); //dummy read
00229     _RD = 1;
00230     
00231     _RD = 0;
00232  //   _RD = 0; // add wait
00233     r |= (_port.read()&0xFF);
00234     r <<= 8;
00235     _RD = 1;
00236     
00237     _RD = 0;
00238  //   _RD = 0; // add wait
00239     r |= (_port.read()&0xFF);
00240     r <<= 8;
00241     _RD = 1;
00242     
00243     _RD = 0;
00244 //    _RD = 0; // add wait
00245     r |= (_port.read()&0xFF);
00246     r <<= 8;
00247     _RD = 1;
00248     
00249     _RD = 0;
00250  //   _RD = 0; // add wait
00251     r |= (_port.read()&0xFF);
00252     _RD = 1;
00253     
00254     _CS = 1; // force CS HIG to interupt the cmd in case was not supported
00255 #ifndef USE_CS //if CS is not used, force fixed LOW again
00256     _CS = 0;
00257 #endif
00258     _port.output();
00259     return r;
00260 }
00261 // in Par mode EXTC regs (0xB0-0xFF) can be directly read
00262 unsigned int PAR8::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd)
00263 {
00264     return rd_reg_data32(reg);
00265 }
00266 void PAR8::hw_reset()
00267 {
00268     wait_ms(15);
00269     _DC = 1;
00270     _CS = 1;
00271     _WR = 1;
00272     _RD = 1;
00273     _reset = 0;                        // display reset
00274     wait_us(50);
00275     _reset = 1;                       // end reset
00276     wait_ms(15);
00277 #ifndef USE_CS
00278     _CS=0;      // put CS low now and forever
00279 #endif
00280 }
00281 void PAR8::BusEnable(bool enable)
00282 {
00283     _CS = enable ? 0:1;
00284 }