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[Hardware] RS485 doesn't work for receive data

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Hardware RS485 doesn't work for receive data

Posted at 1/18/2025 21:21:45      View2021 | Replies8        Print      Only Author   [Copy Link] 1#
  • Type: Self-Compiled Firmware
  • SDK Package Name: firefly_rk3562_aio-3562jq_buildroot_defconfig
  • Last Commit: 0000-00-00 00:00:00
  • Modification Content: bsp from firefly gitlab
  • Log: log_log.zip
Problem description and steps to reproduce:
I have an AIO-3568JQ mainboard. I try it to connect to a sensor over RS485 interface. I can send data, but I can't receive. I checked it with a logic analyzer on CA-IS3082 chip (3, 4-5, 6 pins). TX changes, RX and RE-DE doesn't change level at all. Also I connected an USB-RS485 converter to check from another PC. I couldn't find any schematic how does it turn the RX on. And I couldn't find any GPIO which can flow control on UART5 in iCore-3562JQ_Specification document. I think there is a GPIO which I can control the flow with.

log_log.zip

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