Beagle Bone serial communication

StackOverflow https://stackoverflow.com//questions/10700796

  •  13-12-2019
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Question

I am working on Beagle Bone Rev A5 and my UART1 and UART2 are working fine with these mux settings:

echo 20 > /sys/kernel/debug/omap_mux/uart1_rxd
echo 0 > /sys/kernel/debug/omap_mux/uart1_txd
echo 1 > /sys/kernel/debug/omap_mux/spi0_d0
echo 21 > /sys/kernel/debug/omap_mux/spi0_sclk

Now I want hardware flow control enabled and for that I want to use UART4 and UART5. Can anybody help me enabling Rx,Tx,RTS,CTS of UART 4 & 5? What will be the mux setting for these UARTs?

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Solution

This page helped me a bit: http://www.jerome-bernard.com/blog/2012/06/04/beaglebone-serial-ports-and-xbees/

You have to set :

  • UART4 - RX /sys/kernel/debug/omap_mux/gpmc_wait0 26 Mode 6 - Input
  • UART4 - TX /sys/kernel/debug/omap_mux/gpmc_wpn 6 Mode 6 - Output
  • UART5 - RX /sys/kernel/debug/omap_mux/lcd_data9 24 Mode 4 - Input
  • UART5 - TX /sys/kernel/debug/omap_mux/lcd_data8 4 Mode 4 - Output
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