Liam Faruq / Mbed 2 deprecated MAX7456_2

Dependencies:   mbed

MAX7456.cpp@3:599209bd1270, 2010-08-26 (annotated)

Committer:
faruq
Date:
Thu Aug 26 11:42:28 2010 +0000
Revision:
3:599209bd1270
Parent:
2:46adf929a2ba
Child:
4:804abcb28b86

        

        
Who changed what in which revision?

        

            
                
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#include "mbed.h"





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#include "MAX7456.h"





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namespace mbed {





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MAX7456::MAX7456(PinName mosi, PinName miso, PinName clk, PinName ncs, PinName nrst, const char* name)





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        : Stream(name), _spi(mosi, miso, clk), _ncs(ncs),_nrst(nrst) {





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// initialisation code here





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    _nrst = 0;





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    wait (0.5);





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    _nrst = 1;





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    wait (0.5);





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    // Setup the spi for 8 bit data, high steady state clock,





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    // second edge capture





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    _spi.format(8,0);





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    // 1MHz clock





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    _spi.frequency(1000000);





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}





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void MAX7456::cls() {





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    int tmp=0;





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    tmp = _read(DMM);





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    tmp &= 0xFB;





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    _write(DMM,tmp);  //Make sure that DMM[2]=0 so that there can be write operations





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    tmp = _read(DMM);





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    tmp |= 0x04;





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    _write (DMM,tmp);   //set DMM[2]=1 to clear all locations





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    // should wait until DMM[2] goes back to zero, so we know the reset it finished





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}





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/*





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void MAX7456::show(){





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   _write(DMAL,0x1e); // location (0,1)





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   _write(DMDI,0x21); // writing the charater address "W" into DMDI 





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   _write(DMAL,0x1f); // location (0,1)





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   _write(DMDI,0x19); // writing the charater address "O" into DMDI 





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   _write(DMAL,0x20); // location (0,1)





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   _write(DMDI,0x1C); // writing the charater address "R" into DMDI 





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   _write(DMAL,0x21); // location (0,1)





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   _write(DMDI,0x16); // writing the charater address "L" into DMDI 





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   _write(DMAL,0x22); // location (0,1)





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   _write(DMDI,0x0E); // writing the charater address "D" into DMDI  0x0E





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   } 





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*/





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int MAX7456::_getc() {





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   wait(5.0);





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   printf("getc function has now been called");





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   return(0);





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}





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void MAX7456::test(){





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   for (int i = 0 ; i < 255 ; i++) {





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       printf("Writing 0x%x to VM1\n",i);





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       _write(VM1,i);





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       wait (0.01);





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       int a = _read(VM1);





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       printf("Read 0x%x from VM1\n",a);       





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   }





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   int b = _read(VM1);





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   printf("Read 0x%x from VM1\n",b);





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   }





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void MAX7456::locate(int x, int y) { 





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    if ( (x<30) && (y<16) ) {





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        int add = y*30+x; //formula for converting coordinates into denary location





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        _write(DMAL,add);





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        _write(DMAH,add>>8); // what does the ">>" mean?





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    }





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     printf("location %d",x);





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}





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void MAX7456::xyincrement(){ // increment starts here





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    int x=0;





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    int y=0;





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    while (x<31&&y<=16){





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        x=x+1;





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        if (x>30){





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        y=y+1;





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        x=0;





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        }





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        locate(x,y);





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    }





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}





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int MAX7456::_putc(int c) {





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    if ((c >= 0x31)&&(c <= 0x39)) { //characters from 1-9





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        c= c-0x30;





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    } 





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    else if ((c >= 0x41)&&(c <= 0x5A)) { // characters from A-Z





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        c= c-0x36;





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    } 





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    else if ((c >= 0x61)&&(c <= 0x7A)) { // characters from a-z





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        c= c-0x3C;





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    } 





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    else if ((c == 0x28)&&(c == 0x29)) { //brackets ()





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        c= c + 0x17;





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    }





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    _write(DMDI,c);





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    xyincrement();





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    /*





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    int data= _read(DMDI);





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    printf("DMDI shows 0x%x",data);





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    return(c);





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    */





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}





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void MAX7456::setdarkness() {





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    _write(VM1,0xC7);





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}





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void MAX7456::initaddress() {





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    int d = _read(DMAH);





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    d= d&0xFC;





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    _write(DMAH,d);     // setting DMAH[1]=0





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    // to module to read/write character address byte





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}





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//   write(HOS,0x2F);





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//   write(VOS,0x17);





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void MAX7456::vtrim(char way, int v) {





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    if (way=='+'){





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        v=~v;





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        _write(VOS,v);





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        }





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    else{





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        v|=0x10;





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        _write(VOS,v);





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        }        





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}





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void MAX7456::htrim(char way, int h) {





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    if (way=='-'){





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        h=~h;





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        _write(HOS,h);





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        }





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    else{





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        h|=0x20;





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        _write(HOS,h);





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        }     





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}





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void MAX7456::format (char mode) {





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    if (mode == 'P') {





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        _write(VM0,0x78);  // PAL





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    } else if (mode == 'N') {





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        _write(VM0,0x78);  // NTSC





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    }





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}





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int MAX7456::_read(int address) {





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// force bit 7 to 1 for a read





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    address |= 0x80;





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    _ncs=0; // select device





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    _spi.write(address);          // send address





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    int value = _spi.write(0x00); // send dummy





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    _ncs=1; //deselect device





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    return (value);





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}





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void MAX7456::_write(int address, int data) {





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    // force bit 7 to 0 for a write





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    address &= 0x7f;





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    // select the device





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    _ncs = 0;





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    // write VM1





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    _spi.write(address); // send address





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    _spi.write(data); // send some data





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    // Deselect the device





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    _ncs = 1;





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}





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}