UARTs

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UARTs

  • Note! Current kernels use ttyS3 (HWUART) for bluetooth. This is available on the BTUART pins by setting GPIO42 and 43 to AF3 - and this is the default configuration. This can be very confusing if you want to use the HWUART for something else! To re-enable HWUART on ttyS3, make bluetooth use ttyS1 (see /etc/default/bluetooth) and then set GPIO42 to AF1 in and GPIO43 to AF2 out. You can then set GPIO48 to AF1 out (HWUART TXD) and GPIO49 to AF1 in (HWUART RXD).


FFUART


FF_CTS
FF_RTS
FF_TXD
FF_RXD




HWUART


HW_CTS
HW_RTS
HW_TXD
HW_RXD




STUART




BTUART


BT_CTS
BT_RTS
BT_TXD
BT_RXD


BT_NRESET Bluetooth reset (output, active low)
CLK_32 32.768 kHz Clock output


  • It is not an exposed interface; mapped to ttyS1 by the kernel and connected physically to the bluetooth module if one is present.
  • BT_NRESET and CLK_32 are for an optional Bluetooth module IC (24-pin flex connector only)










Related pages on the old wiki:

http://docwiki.gumstix.org/index.php/Gumstix_UARTs

http://docwiki.gumstix.org/index.php/Gumstix_motherboard_I/O#UART

http://docwiki.gumstix.org/index.php/Tips_and_tricks#UARTs


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