Question

我需要在Beaglebone Black上通过(50-60Hz)采样模拟信号AIN0。我需要的是样本大小为10,000，采样率为1毫秒(should run for 10 secs)。

我在beaglebone_pru_adc库中找到的python示例如下 -

import beaglebone_pru_adc as adc
import time

numsamples = 10000 # how many samples to capture

capture = adc.Capture()

capture.oscilloscope_init(adc.OFF_VALUES, numsamples) # captures AIN0 - the first elt in AIN array

capture.cap_delay = 200000  # I don't understand how to write this part to achieve desired sampling rate

capture.start()

for _ in range(10):
        if capture.oscilloscope_is_complete():
                break
        print '.'
        time.sleep(0.1)

capture.stop()
capture.wait()

print 'Saving oscilloscope values to "data.csv"'

with open('data.csv', 'w') as f:
        for x in capture.oscilloscope_data(numsamples):
                f.write(str(x) + '\n')

print 'done'

capture.close()

我认为我错了，因为我不希望收购在10 secs之前完成。有关如何以特定采样率为BB ADC实现特定样本量的任何帮助都将是非常有用的。

使用LIBPRU进行模拟采样而不是beaglebone

0 个答案: