Products > Test Equipment
SDS1202X-E Trigger Serial doesnt work?
STM55:
Hi! I cant trigger spi signal (1 burst in 2 seconds)
Latest firmware 1.3.27
Spi in: mode 3
Data sent: 0xF0
Trigger set to -> serial
data : 8
Clock:CH1: edge:falling treshold 1V
MOSI:CH2 treshold 1V
bits set to: xxxx xxxx
order: MSB
Auto semms to give short blip on screen, normal mode does nothing, single mode does nothing.
I can trigger this signal in trigger: edge, it looks ok.
Edge:
tautech:
Seems obvious you have data that isn't coinciding with the clock. :-//
No wonder a Serial trigger is confused.
nctnico:
Buzzz. Wrong answer. That data looks just fine. Keep in mind that with SPI data can be send/captured on rising or falling edges. In this case data is sent on rising edges and captured by the device on the falling edges.
The right answer is likely that just like serial decoding, SPI decoding got messed up as well on a recent firmware release on this oscilloscope. The OP can try to downgrade to a previous firmware version to see if that works.
tautech:
--- Quote from: nctnico on January 16, 2024, 08:40:06 pm ---Buzzz. Wrong answer. That data looks just fine. Keep in mind that with SPI data can be send/captured on rising or falling edges. In this case data is sent on rising edges and captured by the device on the falling edges.
--- End quote ---
Data is Ch2, and about 4 clock cycles of it are before the active the clock period.
Something is wrong with the OP's setup.
ebastler:
--- Quote from: tautech on January 16, 2024, 10:26:19 pm ---Data is Ch2, and about 4 clock cycles of it are before the active the clock period.
Something is wrong with the OP's setup.
--- End quote ---
It should not matter what the data line does before the clock pulses start. There is valid data while the clock ticks, and it does represent the intended value of $F0, sent MSB first.
However, it looks like the data line changes exactly on a falling edge of the clock. If that is meant ot be the active clock edge, there may be an ill-defined state at that point. (If a hold time is required after the edge -- not sure whether that is the case?)
Navigation
[0] Message Index
[#] Next page
Go to full version