Hello, I’m using LC29H(AA) module with UART connection (D_SEL1=0, D_SEL2=0) but every seconds I receive garbage data like this:
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"GŽ[V‡&.´&.NL&OL&ILG%3§Dˆ,ˆé§3HÉ,(G.¹Ö.a0.q&‡GQ(.©¡©¸‰‘arÄbÂaaâq±‰ÁaÂaq,¦-œNƒ„2GŽ[V‡&.´6.&.Ž&.‹6IÉ“³H,ˆSˆs(Ö&q,q‰+.«.(a&‡GQ,.0m6v70q9.–6.L&.L&0v80x8›ˆ‰…È¥’"m.&‡GW´.ˆ..ˆI…Âq,\(r)‘i.&‡q.(Ö(..i(aa2ÁG=.=‹i&‡GQ,ƒ.©¡¹q.…‘arÆcÂaaaa.¹ÄÁaâqq,®-1sC!’ŠËE劈..Âm,\O.L,r)‘i.&a,aaÉ.É..G.a...Ö‹‰&‡GQNƒ&0p86t<.…‘arÄbÂaaÂa±‰ÁaÂaqlK)1ƒÃaH–ÉDõŠˆ..ˆi…ˆ‰…ˆé…â¥.‰i.¡iaÉ,ˆ,ˆ,ˆ±7..i.a‰&‡GQNƒ60p86tN.…r6WL&.L&.L87pLžaÂaq,¦)˜b.
"GŽ[V‡&.´&.&.Ž&.‹6IÉ“³H.,ˆSˆÉaa,É,“G..Á..™.&&‡gQ,.©©q.…2\W.L6..l607pÌžaÂas,¦-˜Lƒ„2GŽ[V‡&.´&.&.Ž&.‹&OJ'QH.,…aa.a.a..!.0i.N&GŽY£..©©‰q.…‘arÄbÂaaâq0n00x8.L&OL[)r:.
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I see some repeating patterns in there. I’m using 115200 baudrate, without changing any configuration of the module (tried all other baudrates but only 115200 has some meaningful patterns). The hex view is also meaningless.
I followed the reference design approach to design the level shifter with transistors between 3.3v MCU and LC29HAAMD.