OXYGEN_DMA_STATUS
oxygen_write8(chip, OXYGEN_DMA_STATUS, 0);
oxygen_write16(chip, OXYGEN_DMA_STATUS, 0);
oxygen_write16(chip, OXYGEN_DMA_STATUS, 0);
oxygen_write16(chip, OXYGEN_DMA_STATUS, 0);
oxygen_write8(chip, OXYGEN_DMA_STATUS, chip->pcm_running);