HW Env: IMX6DL
SF Env: Yocto (Kernel version 3.10.7)
I connect the BT module with UART3(with CTS and RTS), the PIN ctrl is like the flow:
UART3_CTS<-------->EIM_D30 (mux_reg = 0x4; pad_reg = 0x130b1)
UART3_RTS<-------->EIM_D31 (mux_reg = 0x4; pad_reg = 0x130b1)
UART3_RXD<-------->EIM_D25 (mux_reg = 0x2; pad_reg = 0x1b0b1)
UART3_TXD<-------->EIM_D24 (mux_reg = 0x2; pad_reg = 0x1b0b1)
the daisy is configured already:
IOMUXC_UART3_UART_RTS_B_SELECT_INPUT reg = 0x2
IOMUXC_UART3_UART_RX_DATA_SELECT_INPUT reg = 0x1
I tested the BT module with another uart(ttyUSB0)and it work ok when it connected the ttyUSB0 uart, so think the BT module is OK.
when i connect the BT to UART3(ttymxc2),and powered up, then use the bt-app write data to uart3 and the BT-CTS and BT-RXD pin is high level without any change, like this:
then Ctrl+C the bt-app, and try again, the BT-CTS is low and data can be transfer on BT-RXD, but sometimes failed in transfering, if success the BT-CTS will hight(int ttyUSB0, the BT-CTS will be hold low), like this:
