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| en:arm:tqma7x:linux:ptxdist:known_issues [2018/06/13 13:37] – added RS485 issue liedmann | en:arm:tqma7x:linux:ptxdist:known_issues [2022/08/04 15:02] (current) – external edit 127.0.0.1 |
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| <embed en:templates:tabs_new> | <embed en:templates:tabs_ptxdist_bootstrap> |
| | <label product_type>Embedded module</label> |
| <label lang>en</label> | <label lang>en</label> |
| <label mod_name>tqma7x</label> | <label mod_name>tqma7x</label> |
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| ===== MBa57x ====== | ===== MBa7x ====== |
| ==== RS485 ==== | ==== RS485 ==== |
| ^ RS485 bus block in half-duplex mode ^^ | ^ RS485 bus block in half-duplex mode ^^ |
| ^ Affects | RS485 via UARTx on MBa57xx Revsion 01xx | | ^ Affects | RS485 via UARTx | |
| ^ Issue | During AM57xx reset the UARTx.CTS# pin is low by default (CPU internal pull down) | | ^ Issue | During i.MX7 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.) | | ^ Effect | Using the MBa7x RS485 circuitry in a half-duplex slave device or half-duplex multi-master environment may block the RS485 bus during i.MX7 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 | | ^ Solution / Workaround | Add a 10k pull up to the UARTx.CTS# signal on carrier board | |
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