Verdex UARTs

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

 

  • Logic level (3.3V) signals
  • BTUART pins are located on the 60-pin Hirose and 24-pin flex ribbon (Verdex only) connectors.
  • 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 ribbon only)