In the novelization, it is revealed that several of her peers in school started calling her by her last name because "Jillian" sounded too feminine, and by the time of the film she almost never answers to her first name. She shares traits with Egon Spengler; both are highly intelligent, tend to do strange things, and eat junk food.
Audio sample data is transferred over I2S using DMA in circular mode. The DMA buffer itself is rather small in order to have the TxRxHalfComplete and TxRxComplete ISR called every time after one audio sample from the left and right channel has been received. I need this because I have an FIR filter function that needs to be called for every sample transmitted and received (tested and works, but not used inside the test program). Inside the ISRs the incoming samples are converted from 24 bit signed PCM into float32 and copied into a bigger circular input buffer. As soon as one half of the buffer is filled with data a flag is set. Inside the main while loop the sample block is then transformed into the frequency domain using arm_rfft_fast_f32 and immediately transformed back into the time domain. The output buffer's current index is delayed to ensure there is enough time to perform the FFT calculations (verified).
I answered the question why I am not doing 4096 sample block DMA transfers in my initial post. I need to filter the incoming samples with a direct FIR filter. This filter function needs to be called for every incoming sample. That's why I am calling it inside the ISRs. This function is not shown in my code because I wanted to create a test program that is as simple as possible to illustrate my issue. The direct FIR filter already worked and I though it would be unnecessarily confusing to include it. Do you think there is another way to do this more efficiently?
Actually in my previous code it would be better not to invert the iSet variable in ISR, but set it to true/false explicitly, depending on half/full or first/second DMA buffer interrupt. That will ensure that it always recovers correctly even if the ISR is delayed for prolonged time. With RTOS the general principles are the same, but typically you can eliminate the iGet variable, because the reception of the notification itself already means that there is a new buffer to process and you don't need additional testing for that. And, if you use the DMA in dual buffer mode, then the absolute fastest way to save "iSet" is to just save the contents of DMA_CR register in ISR and get the buffer index from the DMA_SxCR_CT bit in thread mode. Just take a note that, when the ISR executes, that bit shows the new buffer, which the DMA is already processing at that moment.
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