Koepel:
Doing simultaneously I2C or SPI seems strange to me. I don't know why.Have you told us yet what kind of accelerometer it is and what your project is ? Perhaps there are other ways.
My system has multiple sensors (ADXL375 accelerometers). I need to read data from all of these accelerometers to create a data packet before processing. Because, the data is accessed in a sequential manner, the total access time adds up. (Total access time= Access time of 1 accelerometer x no. of sesnors). I have multiple SPI channels enabled, but they serve no purpose as when the data is being accessed on 1 channel, the other channel is idle. What I am thinking is that if somehow both channels access data simultaneously, the total access time will be almost halved. Not sure if this can be done without DMA.