private void button2_Click(object sender, EventArgs e) //停止按键
{
short err = 0;
uint start_pos;
uint access_cnt;
timer1.Enabled = false;
err = D2KDASK.D2K_AI_AsyncClear((ushort)m_dev, out start_pos, out access_cnt);
button2.Enabled = true;
button1.Enabled = true;
}