File content as of revision 0:94b74988d717:

#include "mbed.h"

SPI spi(P0_28, P0_24, P0_29); // mosi, miso, sclk
DigitalOut cs(P0_23);
DigitalOut hold(P0_23);


// ACC Registers
#define FM25CL_WREN 0x06
#define FM25CL_WRDI 0x04
#define FM25CL_RDSR 0x05
#define FM25CL_WRSR 0x01
#define FM25CL_READ 0x03
#define FM25CL_WRITE 0x02

#define TEST_LENGTH 4

void writeMemory(){
    cs = 0;        
    spi.write(FM25CL_RDSR);
    //should be 0x00
    uint8_t val_register = spi.write(0x00);
    spi.write(FM25CL_WREN);
    spi.write(FM25CL_RDSR);
    //should be 0x04
    uint8_t val_register2 = spi.write(0x00);
    spi.write(FM25CL_WRITE);
    spi.write(0x00);
    spi.write(0x00);
    for (uint8_t i=0;i<TEST_LENGTH;i++){            
        spi.write(i);                        
    }        
    cs = 1;     
}
void readMemory(){
    cs = 0;        
    spi.write(FM25CL_RDSR);
    //should be 0x00
    uint8_t val_register = spi.write(0x00);
    spi.write(FM25CL_READ);    
    spi.write(0x00);
    spi.write(0x00);
    //should be next increments up to test_length    
    for (uint8_t i=0;i<TEST_LENGTH;i++){                
        uint8_t data = spi.write(0x00);
    }
    cs = 1;     
}

//Test that spi is working with fram FM25CL memory
int main() {
    hold=1;
    cs=1;
    while(1) {
        writeMemory();
        wait(0.5);       
        readMemory();
        wait(0.5); 
    }
}