Hi,
KL43 is using the same I2S/SAI module with KL26 chip. Please check MCUXpresso SDK V2.2 for FRDM-KL26Z software package provides the SAI module driver (fsl_sai.c & fsl_sai.h) with below path:
..\SDK_2.2_FRDM-KL26Z\devices\MKL26Z4\drivers
The SAI demo software could be found at MCUXpresso SDK V2.2 for TWR-KL43Z48M board:
\SDK_2.2.1_TWR-KL43Z48M\boards\twrkl43z48m\driver_examples\sai
MCUXpresso SDK software package could be downloaded from here.
Wish it helps.
Have a great day,
Ma Hui
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