I am using an LPC 4370 to make an interrupt driven data acquisition through HSADC, gets data through DMA. I found two things happening, there is about a 280 mu second delay per acquisition, also there is a rectification that happens to the signal, only the lower part of the signal is found in the acquired samples. I am yet to find the reason why. If someone could help me with this, it would be great. I am throwing data to an RPi through SPI protocol.