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#define I2S_EVT_MIC 0x0
#define I2S_EVT_SPK 0x1
#define I2S_MAX_HANDLER 2
#define I2S_PIN_CK 1 // pin 9
#define I2S_PIN_CKE 12 // pin 18
#define I2S_PIN_CKF 18 // pin 2
#define I2S_PIN_SD 13 // pin 19
#define I2S_PIN_WS 11 // pin 17
#define I2S_PIN_LR 13 // pin 19
#define I2S_IRQ_WS_ID (INT_PWM2_BASE + 0)
#define I2S_IRQ_SD_ID (INT_PWM2_BASE + 3)
#define I2S_IRQ_WS_PRIORITY 6
#define I2S_IRQ_SD_PRIORITY 7
#define I2S_SMPL_BITS 13
#define I2S_IDLE_CYCLES 8
#define I2S_PWM_SCALE_CK 2
#define I2S_PWM_SCALE_CK_MASK 0x0003
#define I2S_ABUF_SIZE_CHUNK 16
/* asm */
#define I2S_ABUF_OFF_IDXR 0
#define I2S_ABUF_OFF_IDXW 2
#define I2S_ABUF_OFF_SIZE 4
#define I2S_ABUF_OFF_ARRAY 8
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