stm32f103ADC sampling time calculation problem

syn222

stm32f103ADC sampling time calculation problem [Copy link]

The time to sample a channel using software trigger = (sampling time + 12.5) * T. If three channels are sampled sequentially, how should the sampling time of the first, second and third channels be calculated? Supplementary content (2018-4-20 14:25): That is, for example, when three channels are sampled and converted continuously, what is the update time of each conversion value?

huo_hu

It is the sum of three times. Soft trigger is generally used in fixed periodic sampling situations.

syn222

huo_hu posted on 2018-3-4 17:14 It is the sum of the three times. Soft trigger is generally used in fixed periodic sampling.

That is, when sampling multiple channels, for example, three channels, is the sampling time of each channel the sum of the three times?

huo_hu

syn222 posted on 2018-3-4 18:24 That is, when there are multiple channels sampling, for example, three channels, is the sampling time of each channel the sum of the three times?

No, the conversion time of each channel is the same as the formula above

huo_hu

ADC_RegularChannelConfig(ADC1, DMAADC_CHANNEL, 1, ADCSAMPLETIME); This is the library function that sets

syn222

huo_hu posted on 2018-3-4 20:29 No, the conversion time of each channel is the same as the formula above

Thank you for the answer. Will the AD sampling and multi-channel sequential conversion affect the sampling time of other channels? In other words, for the same channel (such as channel 1), under the same AD frequency and sampling time settings, is the sampling conversion time the same for channel 1 sampling conversion alone compared with channel 1 and channel 2 and channel 3 multi-channel sequential conversion?

syn222

huo_hu posted on 2018-3-4 20:29 No, the conversion time of each channel is the same as the formula above

Thank you for the answer. Will the AD sampling and multi-channel sequential conversion affect the sampling time of other channels? In other words, for the same channel (such as channel 1), under the same AD frequency and sampling time settings, is the sampling conversion time the same for channel 1 sampling conversion alone compared with channel 1 and channel 2 and channel 3 multi-channel sequential conversion?