发送部分：


#define TAG "mic"
#define SAMPLE_RATE 8000
#define TP_MESH_SEND_ADDR "FFBF"
/*
* dma_buffer_size = dma_frame_num * slot_num * slot_bit_width / 8
* the `dma_frame_num` should be the multiple of `3` when the data bit width is 24.
* the `channel_num` should be 1 when the slot mode is mono ...