Embedded module TQMa57xx - Yocto Linux BSP documentation
Known Issues
MBa57x
RS485
| RS485 bus block in half-duplex mode | |
|---|---|
| Affects | RS485 via UARTx on MBa57xx Revsion 01xx |
| Issue | During AM57xx reset the UARTx.CTS# pin is low by default (CPU internal pull down) |
| Effect | Using the AM57xx RS485 circuitry in a half-duplex slave device or half-duplex multi-master environment may block the RS485 bus during AM57xx reset. The bus is released as soon as the UARTx.CTS# pin is properly configured by software (e.g. U-Boot, Linux, etc.) |
| Solution / Workaround | Add a 10k pull up to the UARTx.CTS# signal on carrier board This behaviour will be fixed with MBa57xx REV.02xx |
Disclaimer
TQ-Systems GmbH provides the Board Support Packages (BSP) free of charge. The software included in the shipment has been configured individually for the starter kits. The software is only intended to evaluate the module. The use of the Board Support Packages (BSP) is only allowed within the scope of functionality described by TQ-Systems GmbH. TQ-Systems GmbH does not accept any liability for all further changes of the Board Support Package and for any damage resulting from its use.
TQ-Systems GmbH provides the Board Support Packages (BSP) free of charge. The software included in the shipment has been configured individually for the starter kits. The software is only intended to evaluate the module. The use of the Board Support Packages (BSP) is only allowed within the scope of functionality described by TQ-Systems GmbH. TQ-Systems GmbH does not accept any liability for all further changes of the Board Support Package and for any damage resulting from its use.