main.cpp

00001 #include "mbed.h"
00002 
00003 //Just a couple of the outputs directly accessible for debug
00004 DigitalIn O0(p14);/*
00005 DigitalIn O1(p15);
00006 DigitalIn O2(p16);
00007 DigitalIn O3(p20);*/
00008 DigitalIn O4(p19);/*
00009 DigitalIn O5(p18);
00010 DigitalIn O6(p17);
00011 DigitalIn O7(p21);*/
00012 
00013 DigitalOut CE(p22);
00014 DigitalOut OE(p24);
00015 
00016 Serial pc(USBTX, USBRX);
00017 
00018 DigitalOut led1(LED1);
00019 DigitalOut led2(LED2);
00020 DigitalOut led3(LED3);
00021 DigitalOut led4(LED4);
00022 BusIn epromdata(p14,p15,p16,p20,p19,p18,p17,p21);
00023 BusOut addressline(p13,p12,p11,p10,p9,p8,p7,p6,p27,p26,p23,p25,p5,p28);
00024 
00025 
00026 int main() {
00027     //CE and OE lines are inverted
00028     CE=1;
00029     OE=1;
00030     //Give me some time to set up a pipe into a file
00031     wait(8);
00032     
00033     int num=16384; //number of addresses
00034     char epromcontents[num]; //char array to store data words
00035     for (int addr=0;addr<num;addr++){
00036         addressline=addr; //set the address
00037         CE=0;//clock the chip
00038         OE=0;
00039         wait(1e-6); //wait a generous 1000ns
00040         epromcontents[addr]=epromdata.read(); //then read the data into the array
00041         //just as a sanity check, send two of the data lines to LEDs 1 and 2
00042         led1=O0;
00043         led2=O4;
00044         //bring the clock lines back up and wait for the output to go back into tristated mode        
00045         CE=1;
00046         OE=1;
00047         wait(1e-6);
00048         
00049     }
00050     //led3 goes on to say we're done
00051     led3=1;
00052 for(int i=0;i<num;i++)
00053 pc.printf("%d\n",epromcontents[i]);//send each byte over usbserial
00054 led4=1;//to say we're done sending
00055 }
00056