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i2s_chan_config_t struct
I2S controller channel configuration
Syntax
typedef struct
{
i2s_port_t id;
i2s_role_t role;
uint32_t dma_desc_num;
uint32_t dma_frame_num;
union {
bool auto_clear;
bool auto_clear_after_cb;
};
bool auto_clear_before_cb;
bool allow_pd;
int intr_priority;
} i2s_chan_config_t;
Fields
Field
Declared as
Description
uint32_t
I2S DMA buffer number, it is also the number of DMA descriptor.
uint32_t
I2S frame number in one DMA buffer. One frame means one-time sample data in all slots, it should be the multiple of `3` when the data bit width is 24.
bool
Set to auto clear DMA TX buffer before `on_sent` callback, I2S will always send zero automatically if no data to send So that user can access data in the callback that just finished to send.
bool
Set to allow power down. When this flag set, the driver will backup/restore the I2S registers before/after entering/exist sleep mode. By this approach, the system can power off I2S's power domain. This can save power, but at the expense of more RAM being consumed.
int
I2S interrupt priority, range [0, 7], if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3).
Examples
Code
Location
Scope
Referrer