public link unit receive {}
driver.receive = receive;
public link bit OS_EventFlag = driver.OS_EventFlag;
public link bit A = driver.key0_press;
public link bit B = driver.key1_press;
public link bit C = driver.key2_press;
public link bit D = driver.key3_press;
public link bit OS_time = driver.OS_time;
public link void OS_init(){} = driver.OS_init;
public link void OS_run(){} = driver.OS_run;
