Hi,
maybe someone can help me out.
It's about the STM32F401. For a few days I'm struggling now but still no I2S data or clock activity shows up at the 4 SPI2 peripheral outputs. All stay low. I like to configure all uC registers by hand for learning purposes. The SPI2 peripheral should produce I2S data. If 16-bit values are written to the SPI2 data register the debugger shows that directly after a new write the TXE bit in the status register is cleared and then reappears and new data is written. But probing the 4 SPI2/I2S2 outputs no data shows up.
Next items are checked: - the original SPI2 peripheral outputs are used so no remapping is needed - the SPI2 peripheral outputs are configured as alternate function outputs push-pull (highest speed) - if the PLLI2S clock is set to external input no repeated TXE interrupts occur (so I2SPLL clock is running) - I2S clock frequency is 96MHz - the SPI2 peripheral clock is switched on - (no alternate function outputs clock is available like at the STM32F103) - SPI2 is configured while SPI2 is disabled - SPI2 is selected to produce I2S (versus SPI) data in PCM mode - I2SDIV=187 and I2SODD=1 (I2S settings according first line in table 91 page 590/841 of reference manual pdf) - finally SPI2 is enabled - using the debugger it is checked that all relevant registers contain the expected values
...still no data comes out...
Maybe I lack some knowledge or forgot something.
Just wondering what it could be.
Looks like a question for ST rather than Keil ?