</span>
    UINT btf        <span class="c">/* &gt;0: Transfer call (Number of bytes to be sent). 0: Sense call */</span>
)
{
    UINT cnt = 0;


    if (btf == 0) {     <span class="c">/* Sense call */</span>
        <span class="c">/* Return stream status (0: Busy, 1: Ready) */</span>
        <span class="c">/* When once it returned ready to sense call, it must accept a byte at least */</span>
        <span class="c">/* at subsequent transfer call, or f_forward will fail with FR_INT_ERR. */</span>
       