typedef bool (*DmaConversionIsFinished_t) (struct Dac *dac);
typedef void (*DmaStartStreamingFunc_t) (struct Dac *dac, void *buf, size_t len, size_t slice_len);
typedef void (*DmaStopFunc_t) (struct Dac *dac);
typedef bool (*DmaConversionIsFinished_t) (struct Dac *dac);
typedef void (*DmaStartStreamingFunc_t) (struct Dac *dac, void *buf, size_t len, size_t slice_len);
typedef void (*DmaStopFunc_t) (struct Dac *dac);