File content as of revision 1:923fec2da9d4:

#include "mbed.h"
#include "USBHostKeyboard.h"
#include "SDFileSystem.h"

DigitalOut led(LED1);
int i=0;
SDFileSystem sd(p5, p6, p7, p8, "sd");

Serial pc1(p13, p14);//tx1, rx1

void onKey(uint8_t key) {
    pc1.printf("%c", key);
    
    ++i;
    FILE *fp;
    fp = fopen("/sd/keylog/log.csv", "a");
    fprintf(fp, "Key[%d], :,0x%x,:,%c\r\n", i, key, key);
    fclose(fp);
}

void keyboard_task(void const *) {
    
    USBHostKeyboard keyboard;
    
    while(1) {
        // try to connect a USB keyboard
        while(!keyboard.connect())
            Thread::wait(500);
    
        // when connected, attach handler called on keyboard event
        keyboard.attach(onKey);
        
        // wait until the keyboard is disconnected
        while(keyboard.connected())
            Thread::wait(500);
    }
}
#include "mbed.h"
#include "USBHostKeyboard.h"
#include "SDFileSystem.h"

DigitalOut led(LED1);
int i=0;
SDFileSystem sd(p5, p6, p7, p8, "sd");

Serial pc1(p13, p14);////シリアルポートのtx,rx

void onKey(uint8_t key) {
  pc1.printf("%c", key);

    ++i;
    FILE *fp;
    fp = fopen("/sd/keylog/log.csv", "a");  //SDカード内のkeylogフォルダの中にcsvファイルを追記形式で開く(新規作成)
    fprintf(fp, "Key[%d], :,0x%x,:,%c\r\n", i, key, key); //押した順番(i)：押したキーのキーコード(key)：押したキーの文字(key)
    fclose(fp); //ファイルを閉じる
  }
  void keyboard_task(void const *) {

    USBHostKeyboard keyboard;

    while(1) {
        // try to connect a USB keyboard
        while(!keyboard.connect())
            Thread::wait(500);
    
        // when connected, attach handler called on keyboard event
        keyboard.attach(onKey);
        
        // wait until the keyboard is disconnected
        while(keyboard.connected())
            Thread::wait(500);
    }
}

int main() {
  mkdir("/sd/keylog", 0777);
  FILE *fp;
  fp = fopen("/sd/keylog/log.csv","w"); //csvを書き込み形式で開く
  fclose(fp); //ファイルを閉じる

  Thread keyboardTask(keyboard_task, NULL, osPriorityNormal, 256 * 4);
  
  while(1) {
    led=!led;
    Thread::wait(500);
  }
}
int main() {
    mkdir("/sd/keylog", 0777);
    FILE *fp;
    fp = fopen("/sd/keylog/log.csv","w");
    fclose(fp);
      
    Thread keyboardTask(keyboard_task, NULL, osPriorityNormal, 256 * 4);
    while(1) {
        led=!led;
        Thread::wait(500);
    }
}