BUS16.cpp

00001  /* mbed UniGraphic library - BUS16 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 "BUS16.h"
00019 
00020 BUS16::BUS16(PinName* buspins, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD)
00021     : _bus(buspins), _CS(CS), _reset(reset), _DC(DC), _WR(WR), _RD(RD)
00022 {
00023     _reset = 1;
00024     _DC=1;
00025     _WR=1;
00026     _RD=1;
00027     _CS=1;
00028     _bus.mode(PullNone);
00029     _bus.output(); // will re-enable our GPIO port
00030     hw_reset();    
00031 }
00032 
00033 void BUS16::wr_cmd8(unsigned char cmd)
00034 {      
00035     _DC = 0; // 0=cmd
00036     _bus.write(cmd);      // write 8bit
00037     _WR=0;
00038     _WR=1;
00039     _DC = 1; // 1=data next
00040 }
00041 void BUS16::wr_data8(unsigned char data)
00042 {
00043     _bus.write(data);    // write 8bit
00044     _WR=0;
00045     _WR=1;
00046 }
00047 void BUS16::wr_cmd16(unsigned short cmd)
00048 {    
00049     _DC = 0; // 0=cmd
00050     _bus.write(cmd>>8);      // write 8bit
00051     _WR=0;
00052     _WR=1;
00053     _bus.write(cmd&0xFF);      // write 8bit
00054     _WR=0;
00055     _WR=1;
00056     _DC = 1; // 1=data next
00057 }
00058 void BUS16::wr_data16(unsigned short data)
00059 {
00060     _bus.write(data>>8);    // write 8bit
00061     _WR=0;
00062     _WR=1;
00063     _bus.write(data&0xFF);    // write 8bit
00064     _WR=0;
00065     _WR=1;
00066 }
00067 void BUS16::wr_gram(unsigned short data)
00068 {
00069     _bus.write(data);    // write 16bit
00070     _WR=0;
00071     _WR=1;
00072 }
00073 void BUS16::wr_gram(unsigned short data, unsigned int count)
00074 {
00075     while(count)
00076     {
00077         _bus.write(data);    // rewrite even if same data, otherwise too much fast
00078         _WR=0;
00079         _WR=1;
00080         count--;
00081     }
00082 }
00083 void BUS16::wr_grambuf(unsigned short* data, unsigned int lenght)
00084 {
00085     while(lenght)
00086     {
00087         _bus.write(*data);    // write 16bit
00088         _WR=0;
00089         _WR=1;
00090         data++;
00091         lenght--;
00092     }
00093 }
00094 unsigned short BUS16::rd_gram(bool convert)
00095 {
00096     unsigned int r=0;
00097    _bus.input();
00098    
00099     _RD = 0;
00100     _bus.read(); //dummy read
00101     _RD = 1;
00102     
00103     _RD = 0;
00104   //  _RD = 0; // add wait
00105     r |= _bus.read();
00106     _RD = 1;
00107     if(convert)
00108     {
00109         r <<= 8;
00110         _RD = 0;
00111   //      _RD = 0; // add wait
00112         r |= _bus.read()>>8; //MSB of port read is blue, LSB is red of next pixel
00113         _RD = 1;
00114         // gram is 18bit/pixel, if you set 16bit/pixel (cmd 3A), during writing the 16bits are expanded to 18bit
00115         // during reading, you read the raw 18bit gram
00116         r = RGB24to16((r&0xFF0000)>>16, (r&0xFF00)>>8, r&0xFF);// 18bit pixel padded to 24bits, rrrrrr00_gggggg00_bbbbbb00, converted to 16bit
00117     }
00118     _bus.output();
00119     return (unsigned short)r;
00120 }
00121 unsigned int BUS16::rd_reg_data32(unsigned char reg)
00122 {
00123     wr_cmd8(reg);
00124     unsigned int r=0;
00125   //  _DC = 1; // 1=data
00126    _bus.input();
00127    
00128     _RD = 0;
00129     _bus.read(); //dummy read
00130     _RD = 1;
00131     
00132     _RD = 0;
00133 //    _RD = 0; // add wait
00134     r |= (_bus.read()&0xFF);
00135     r <<= 8;
00136     _RD = 1;
00137     
00138     _RD = 0;
00139 //    _RD = 0; // add wait
00140     r |= (_bus.read()&0xFF);
00141     r <<= 8;
00142     _RD = 1;
00143     
00144     _RD = 0;
00145 //    _RD = 0; // add wait
00146     r |= (_bus.read()&0xFF);
00147     r <<= 8;
00148     _RD = 1;
00149     
00150     _RD = 0;
00151 //    _RD = 0; // add wait
00152     r |= (_bus.read()&0xFF);
00153     _RD = 1;
00154     
00155     _CS = 1; // toggle CS to interupt the cmd in case was not supported
00156     _CS = 0;
00157 
00158     _bus.output();
00159     return r;
00160 }
00161 // in Par mode EXTC regs (0xB0-0xFF) can be directly read
00162 unsigned int BUS16::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd)
00163 {
00164     return rd_reg_data32(reg);
00165 }
00166 // ILI932x specific
00167 void BUS16::dummyread()
00168 {
00169     _bus.input();
00170     _RD = 0;
00171     _bus.read();    // dummy read
00172     _RD=1;
00173  //   _bus.output();
00174 }
00175 // ILI932x specific
00176 void BUS16::reg_select(unsigned char reg, bool forread)
00177 {    
00178     _DC = 0;
00179     _bus.write(reg);    // write 16bit
00180     _WR=0;
00181     _WR=1;
00182     _DC = 1; // 1=data next
00183 }
00184 // ILI932x specific
00185 void BUS16::reg_write(unsigned char reg, unsigned short data)
00186 {
00187     _DC = 0;
00188     _bus.write(reg);    // write 16bit
00189     _WR=0;
00190     _WR=1;
00191     _DC = 1;
00192     _bus.write(data);    // write 16bit
00193     _WR=0;
00194     _WR=1;
00195 }
00196 // ILI932x specific
00197 unsigned short BUS16::reg_read(unsigned char reg)
00198 {
00199     unsigned short r=0;
00200     _DC = 0;
00201     _bus.write(reg);    // write 16bit
00202     _WR=0;
00203     _WR=1;
00204     _DC = 1;
00205     _bus.input();
00206     _RD=0;
00207     r |= _bus.read();    // read 16bit
00208     _RD=1;
00209     _bus.output();
00210     return r;
00211 }
00212 void BUS16::hw_reset()
00213 {
00214     wait_ms(15);
00215     _DC = 1;
00216     _CS = 1;
00217     _WR = 1;
00218     _RD = 1;
00219     _reset = 0;                        // display reset
00220     wait_ms(2);
00221     _reset = 1;                       // end reset
00222     wait_ms(100);
00223 }
00224 void BUS16::BusEnable(bool enable)
00225 {
00226     _CS = enable ? 0:1;
00227 }