User Activity

i am just executing a for loop of 4096 time. But it takes more than 1 ms in stm32f429zi series. Clock frequency is 180MHz. How it can take that much time or whether it is executing some other function in back end.
Hello sir! I want to connect single ADC with 2 channels and associated with DMA. But the DMA memory is allocated properly and ADC is not sampling the signal properly. is there any additional configuration to connect ADC with DMA?