Reddit reviews HiLetgo USB Logic Analyzer Device With EMI Ferrite Ring USB Cable 24MHz 8CH 24MHz 8 Channel UART IIC SPI Debug
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The logic for each channel sampling rate of 24M/s. General applications around 10M, enough to cope with a variety ofoccasions; 8-channelSampling rate up to: 24 MHz , can be 24MHz. 16MHz, 12MHz, 8MHz, 4MHz, 2MHz, 1MHz, 500KHz, 250KHz, 200KHz, 100KHz, 50KHz, 25KHz;The logic for each channel sampling rate of 24M/s. General applications around 10M, enough to cope with a variety ofoccasions;Input voltage range: -0.5V to 5.25V; Input Low Voltage: -0.5V to 0.8V; Input High Voltage: 2.0V to 5.25VInput Impedance: 1Mohm || 10pF (typical, approximate); Crystal: +/-20ppm, 24MHz
I was about to say the same thing, I had the opposite problem where my code was too slow and removing debug flags made it much much faster. This is probably your issue. And you're going to want a logic analyzer for doing embedded work.
If you need a budget analyzer try this one:
https://www.amazon.com/dp/B077LSG5P2?ref=ppx_pop_mob_ap_share
It works well with both PulseView and Salaea.
Voltage is important. You could be looking at "real" RS232 or something like TTL/CMOS UART. Additionally, there is no guarantee that the pins will be wired as they are in the cables you linked (especially if going to JST). Best practice would be to check ground continuity (while off) and voltage levels (while on) and use a logic analyzer on the inputs (eg. Haven't used this exact one, but it is a popular Chinese clone https://www.amazon.com/HiLetgo-Analyzer-Ferrite-Channel-Arduino/dp/B077LSG5P2/ref=mp_s_a_1_1?ie=UTF8&qid=1555138013&sr=1-1&pi=AC_SX236_SY340_FMwebp_QL65&dpPl=1&dpID=41wZsMYKyUL&ref=plSrch). Note that if you do find voltages in excess of 5 v, you are probably working with spec RS232 voltages and you should use a different logic analyzer than the one that I linked.