Hello,
I'm using NXP-SC16IS750 as I2C to UART bridge in Linux embedded board with kernel 4.4.120, but both of the RS232 /RS485 are not working.
Attach is the SC16IS7xx driver that we used.
The /dev/ttySC0 shows up after modifying the DTS to fit our hardware design.
The test result fails when an X86 PC connects to this embedded board (w/ SCI16IS750).
The test result is okay if the X86 PC connects to another board.
The scope connects to the PC side, which shows the DB9 TX pin has the signal when the PC side sends some characters.
No signal shows up on DB9 TX and RX pins, when this embedded board sents some characters.
Is there specific item that we need to implement or which driver should we used to implement the function of SC16IS750 bridge?
DTS
i2c@11000 {
pinctrl-names = "default";
pinctrl-0 = <&i2c0_pins>;
status = "okay";
clock-frequency = <100000>;
sc16is750: sc16is750@48 {
compatible = "nxp,sc16is750";
interrupts-extended = <&gpio0 11 8>;
clocks = <&coreclk 0>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
reg = <0x48>;
};
};
Thanks.
