File content as of revision 0:67a2a0e8c475:

/*
Test Writes to spi flash, all works

*/
#include "mbed.h"
#include "USBSerial.h"


//DigitalOut myled(LED1);
USBSerial pc;
//Timer t;

DigitalOut cs(P0_22);
DigitalIn button(P1_15);
int dummy = 0;
//Serial pc(USBTX, USBRX); // tx, rx



int main()
{
    while(1) {
        char c  = 0;
        while(c==0) {
            c = pc.getc();
            pc.printf("Waiting");
            wait(1);

        }

        pc.printf("\n\rtime = ");
        for(int i = 0; i<5; i++) {
            pc.printf("%.d", 5-i);
            wait(1);
            pc.putc(8);
        }
        SPI my_spi(P0_9,P0_8,P0_10); // mosi, miso, sclk
        // Chip must be deselected
        cs = 1;
        my_spi.format(8,3);// Setup the spi for 8 bit data, low steady state clock,
        my_spi.frequency(10000);// second edge capture, with a 1MHz clock rate
        /*
            cs = 0;
            int v1 = my_spi.write(0x05);         // Send Read status reg command
            int v2 = my_spi.write(0x1);
            int v3 = my_spi.write(0x1);
            pc.printf("Staus reg =  %.x %.x %.x\n\r",v1, v2, v3);
            cs = 1;
            wait_ms(2);

            cs = 0;
            v1 = my_spi.write(0x9f);         // Send Read status reg command
            v2 = my_spi.write(0x1);
            v3 = my_spi.write(0x1);
            v1 = my_spi.write(0x1);
            pc.printf("RID =  %.x %.x %.x \n\r",v1, v2, v3);
            cs = 1;
        */



        cs=1;

        // while (1){//(button ==1) {
        pc.printf("\n\rStart___________________________________\n\r");
        //t.start();

        cs = 0;                     // Bring chip select low to write to FeRAM
        my_spi.write(0x06);         // Send WREN command
        cs = 1;                     // Bring chip select high to stop writing

        // Thought I would wait a bit to get a cleaner scope trace
        wait_us(10);

        /**** START OF WRITE SEQUENCE ****/
        for(int i = 0; i>256; i++) {
            cs = 0;                     // Bring chip select low to write to FeRAM
            my_spi.write(0x02);         // Send write command
            my_spi.write(0x00);         // Send top address byte to wrtie to
            my_spi.write(0x00);         // Send Middle address byte to wrtie to
            my_spi.write(i);            // Send Bottom address byte to wrtie to
            // Send data to be write
            my_spi.write(i+1);
            cs = 1;
            wait_us(5);
        }
        //pc.printf("last i %.d", i);


        /**** END OF WRITE SEQUENCE ****/

        // Thought I would wait a bit again
        wait_us(10);

        /**** START OF READ SEQUENCE ****/
        int my_val[1200];                 // Variable to store the read data
        cs = 0;
        my_spi.write(0x03);         // Send read command
        my_spi.write(0x00);         // Send top address byte to wrtie to
        my_spi.write(0x00);         // Send Middle address byte to wrtie to
        my_spi.write(0x00);         // Send Bottom address byte to wrtie to
        //pc.printf("\n\r %.d", my_spi.write(dummy));

        for(int i=0; i<256; i++) {
            wait_us(10);
            my_spi.write(0);
        }
        cs=1;
        //t.stop();
        //float time = t.read();
        //pc.printf("The time taken was %f seconds\n", time);
        /*
        int counter = 0;
        for(int i=0; i<1200; i++) {
            wait_us(5);
            pc.printf("%x",my_val[i]);
            /*
            if(my_val[i]>00){
                pc.printf("#");
                counter++;
            }
            else{
                pc.printf(" ");
                counter = 0;
            }

            if ((i%60)==0) {
                pc.printf("\n ");
            }

        }

        int val = my_spi.write(0);
        pc.printf("\n\rDone %.x",val);
        cs=1;
        //}
        }
        */
    }
}