Constant esp_idf_hal::i2s::config::SOC_I2S_PDM_MAX_TX_LINES

pub const SOC_I2S_PDM_MAX_TX_LINES: usize = 2;

The maximum number of data input pins that can be used in PDM mode.

This is 1 on the ESP32, and 2 on the ESP32-S3, ESP32-C3, ESP32-C6, and ESP32-H2.