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ADC-100 User's Guide6

BM_SINGLE is useful when you wish to collect data at high speed for a relatively short

period. For example, to collect 1000 readings in 50 ms.

BM_WINDOW is useful when collecting several blocks of data at relatively low speeds- for

example when collecting 10000 samples over 10 seconds. Collecting a sequence of

SINGLE blocks like this would take 10 seconds for each block, so displayed data would

not be updated frequently. Using windowing, it is possible to ask for a new block more

frequently, for example every second, and to receive a block containing nine seconds

of data that have already been seen and one second of new data. The block is

effectively a 10-second 'window' that advances one second each time.

BM_STREAM is useful when you need to collect data continuously for long periods. In

principle, it would be possible to collect data indefinitely. Each time

adc100_get_values is called, it returns the new readings since the last time it was

called. No_of_values passed to adc100_run must be sufficient to ensure that the

buffer does not overflow between successive calls to adc100_get_values. For

example, if you call adc100_get_values every second, and you are collecting 500

samples per second, no_of_values must be at least 500, and preferably 1000 to give

some allowance for delays in the operating system.

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