Standart I2S (INMP441):
i2s_port_t m_i2sPort = I2S_NUM_0;
// i2s config for reading from left channel of I2S
i2s_config_t i2sMemsConfigLeftChannel = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
.sample_rate = 16000,
.bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S),
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
.dma_buf_count = 4,
.dma_buf_len = 1024,
.use_apll = false,
.tx_desc_auto_clear = false,
.fixed_mclk = 0};
MSB justified + Falling edge data sampling (SPH0645):
Fix 1:
//Set to Left MSB justified
.communication_format = I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB,
For idf >=5
Change I2S_STD_PHILIP_SLOT_DEFAULT_CONFIG to I2S_STD_MSB_SLOT_DEFAULT_CONFIG
//or modify register by:
REG_SET_BIT(I2S_CONF_REG(m_i2sPort), I2S_RX_MSB_SHIFT);
Fix 2:
//Set to delay sampling time at falling edge(neg edge)
REG_SET_BIT(I2S_TIMING_REG(m_i2sPort), BIT(9)); // [9:8] –> I2S_RX_SD_IN_DELAY
/*
The I2S_RX_SD_IN_DELAY parameter is used to configure the delay mode of the I2S (Inter-IC Sound) RX SD input signal. The delay mode of I2S Rx SD input signal. 0: bypass. 1: delay by pos edge. 2: delay by neg edge. 3: not used
*/
