Bluetooth uart and DTE mode

jinsensi — Fri, 04 Mar 2016 15:03:33 GMT

I'm trying to use imx6 qdl uart for bluetooth. My bluetooth chip is BCM4339.

I want to use RTS CTS flow control in DTE mode. In DCE mode, it was working without flow control but flow control was not working. So I try DTE mode and this time Rts Cts seems to work but not Rx and Tx.

So here are my connection :

pinctrl_uart2_3: uart2grp-3 { /* Bluetooth mode */

fsl,pins = <

MX6QDL_PAD_SD3_DAT5__UART2_TX_DATA IPAD_CTL_PWUART (connected to Rx BCM4339)

MX6QDL_PAD_SD3_DAT4__UART2_RX_DATA IPAD_CTL_PWUART (connected to Tx BCM4339)

MX6QDL_PAD_SD3_CLK__UART2_CTS_B IPAD_CTL_PWUART (connected to CTS BCM4339)

MX6QDL_PAD_SD3_CMD__UART2_RTS_B IPAD_CTL_PWUART (connected to RTS BCM4339)

};

When I try to enable bluetooth, HCI reset frame is sent on Tx pin of BCM4339. So I try to invert Rx and Tx with imx6 mux. But the HCI reset frame is still sent to Tx pin of BCM4339.

How should I configure Rts, Cts, Rx and Tx to make this work in DTE mode ?

i.MX ProcessorsのトピックRe: Bluetooth uart and DTE mode

Bluetooth uart and DTE mode

Re: Bluetooth uart and DTE mode