Diff: MAX7456.cpp

Revision:

0:869f2c6f960d

Child:

1:ba08ad32bb88

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX7456.cpp	Mon Aug 23 10:39:40 2010 +0000
@@ -0,0 +1,128 @@
+#include "mbed.h"
+#include "MAX7456.h"
+
+namespace mbed {
+
+
+
+MAX7456::MAX7456(PinName mosi, PinName miso, PinName clk, PinName ncs, PinName nrst, const char* name)
+        : Stream(name), _spi(mosi, miso, clk), _ncs(ncs),_nrst(nrst) {
+
+// initialisation code here
+
+    _nrst = 0;
+    wait (0.5);
+    _nrst = 1;
+    wait (0.5);
+
+    // Setup the spi for 8 bit data, high steady state clock,
+    // second edge capture
+    _spi.format(8,0);
+
+    // 1MHz clock
+    _spi.frequency(1000000);
+}
+
+
+void MAX7456::cls() {
+    int tmp=0;
+    tmp = _read(DMM);
+    tmp &= 0xFB;
+    _write(DMM,tmp);  //Make sure that DMM[2]=0 so that there can be write operations
+
+    tmp = _read(DMM);
+    tmp |= 0x04;
+    _write (DMM,tmp);   //set DMM[2]=1 to clear all locations
+
+    // should wait until DMM[2] goes back to zero, so we know the reset it finished
+
+}
+
+
+void MAX7456::locate(int x, int y) { //not sure if I understand the last line
+    if ( (x<30) && (y<16) ) {
+        int add = y*30+x; //formula for converting coordinates into denary location
+        _write(DMAL,add);
+        _write(DMAH,add>>8); // what does the ">>" mean?
+    }
+}
+
+
+
+int MAX7456::_getc() {
+    
+    return(0);
+}
+
+
+int MAX7456::_putc(int c) {
+
+    if ((c >= 0x31)&&(c <= 0x39)) { //characters from 1-9
+        c= c-0x30;
+    } else if ((c >= 0x41)&&(c <= 0x5A)) { // characters from A-Z
+        c= c-0x36;
+    } else if ((c >= 0x61)&&(c <= 0x7A)) { // characters from a-z
+        c= c-0x3C;
+    } else if ((c == 0x28)&&(c == 0x29)) { //brackets ()
+        c= c + 0x17;
+    }
+
+    _write(DMDI,c);
+
+    return(c);
+}
+
+void MAX7456::setdarkness(){
+    _write(VM1,0xC7);
+    }
+
+void MAX7456::initaddress(){
+   int d = _read(DMAH);
+   d= d&0xFC;
+   _write(DMAH,d);     // setting DMAH[1]=0
+   // to module to read/write character address byte
+   }
+
+
+
+
+void MAX7456::vtrim(int v) {
+}
+
+void MAX7456::htrim(int h) {
+}
+
+
+void MAX7456::format (char mode) {
+
+    if (mode == 'P') {
+        _write(VM0,0x78);  // PAL
+    } else if (mode == 'N') {
+        _write(VM0,0x78);  // NTSC
+    }
+    
+}
+
+int MAX7456::_read(int address) {
+// force bit 7 to 1 for a read
+    address |= 0x80;
+    _ncs=0; // select device
+    _spi.write(address);          // send address
+    int value = _spi.write(0x00); // send dummy
+    _ncs=1; //deselect device
+    return (value);
+}
+
+void MAX7456::_write(int address, int data) {
+    // force bit 7 to 0 for a write
+    address &= 0x7f;
+    // select the device
+    _ncs = 0;
+    // write VM1
+    _spi.write(address); // send address
+    _spi.write(data); // send some data
+    // Deselect the device
+    _ncs = 1;
+}
+
+}
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