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iMX7 I2C TX data HW FIFO available?

Question asked by Jeremy McClintock on Sep 6, 2019
Latest reply on Sep 9, 2019 by Jeremy McClintock

Looking through the iMX7 Linux/MQX/FreeRTOS code and iMX7 datasheet it appears that there is only a single byte TX data register available for the I2C peripherals.  I just wanted to make sure that I was not missing something, because this represents a pretty huge bottle-neck having to switch in/out of interrupt context for sending every single byte when using an interrupt driven I2C driver?  In our system we employ four I2C peripherals configured for the M-core, and attempting to service a single I2C device on each individual bus is extremely inefficient due to the single-byte HW data register.


On every other microprocessor I have every used (8-bit/16-bit/32-bit, many manufacturers) there has been at least an 8-byte HW FIFO on the I2C peripheral.  So I am asking if I am missing something in the datasheet, or if there is a way to increase the size of the HW data FIFO beyond a single byte?