#include <SPI.h>
#define SS_PIN    10

void setup()
{
    pinMode(SS_PIN, OUTPUT);
    SPI.begin(); 
    SPI.setClockDivider(SPI_CLOCK_DIV8); 
}
void loop()
{
    byte ret_val;
    uint8_t mem[64];
    //    //    memset(mem, 0, 64);
    digitalWrite(SS_PIN, LOW);
    SPI.write(mem, 64);
    digitalWrite(SS_PIN, HIGH);
    delay(1000);
}