pub fn tx_buf(i2s: ove_i2s_t) -> Option<*mut u8>Expand description
Pointer to the TX half-buffer safe to write, or None if the
handle is invalid.
Returns the half of the DMA TX buffer that DMA is not currently
transmitting from. Fill this buffer before the next TX callback.
The pointed-to memory is [half_buf_size] bytes long and remains
valid until the next stop or destroy on the same handle.