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Emulate I2S with SPI on LaunchPad

andre.marianovich
Intellectual 975 points

Hi

I found spma042a.pdf and want to try to emulate the I2S peripheral on the stellaris launchpad which comes with a LM4F120. The SSI respectively the SPI interface supports 16 bit fifo and up to 16 bits of data frame size. But I would need a data frame size of 24 bit per sample and a sample rate with at least 8 kHz. In addition, the microphone I want to drive with the emulated I2S interface hase no MCLK input, just the three defaults (WS, SCLK, SD). Is this generally possible to implement?