topic Re: irda-mode Setting in i.MX Processors

irda-mode Setting

myungjukim — Tue, 16 Jun 2015 10:30:58 GMT

Hi, Community

I'm Imxqsabresd evt board user.

I'll do test various setting but I don't get proper output and any event.

Strange point is

1) memtool UART2.* output is

SOC: i.MX6Q

UART2 Addr:0x21e8000

Bus error

2) When 1) try test, also output is "Unhandled fault: external abort on non-linefetch (0x1018) at 0x76ff9000"

How to setting for Irda-mode use uart ? What is check point ? Is it possible irda as imx.c serial driver ?

<dmesg>

[ 1.323353] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 59) is a IMX

[ 1.323671] serial: Freescale lpuart driver

My setting is as below.

&uart2 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_uart2_1>;

status = "okay";

};

uart2: serial@021e8000 {

compatible = "fsl,imx6q-uart", "fsl,imx21-uart";

reg = <0x021e8000 0x4000>;

interrupts = <0 27 0x04>;

clocks = <&clks 160>, <&clks 161>;

clock-names = "ipg", "per";

dmas = <&sdma 27 4 0>, <&sdma 28 4 0>;

dma-names = "rx", "tx";

fsl,irda-mode;

status = "disabled";

};

uart2 {

pinctrl_uart2_1: uart2grp-1 {

fsl,pins = <

MX6QDL_PAD_GPIO_7__UART2_TX_DATA 0x1b0b1

MX6QDL_PAD_EIM_D27__UART2_RX_DATA 0x1b0b1

};

Re: irda-mode Setting

igorpadykov — Thu, 18 Jun 2015 14:37:03 GMT

Hi Christian

had you tried to add to imx_v7_defconfig

CONFIG_IRDA=m

Best regards

igor

Re: irda-mode Setting

myungjukim — Fri, 19 Jun 2015 05:07:00 GMT

Hi, igor,

I have already done the kernel config that you said.

It Is same result.

Best regards.

Re: irda-mode Setting

igorpadykov — Fri, 19 Jun 2015 12:40:16 GMT

Hi Christian

one can add debug printfs to linux..tty/serial/imx.c (it has "#ifdef CONFIG_IRDA ")

and check MDEN, IREN settings as in attached part of RM

Best regards

igor

Re: irda-mode Setting

myungjukim — Mon, 22 Jun 2015 11:19:47 GMT

Hi, igor

I've already checked of IRDA mode procedure. and MDEN, IREN setting id is below.

Can you check it what I missing it ?

I think that I've do that any method as possible. but I don't get any event.

# ./memtool UART2.UCR1.IREN=0x01

# modprobe irtty-sir

# irattach /dev/ttymxc1 -s

# irdadump -d -x -s 256

Best Regards,

Re: irda-mode Setting

igorpadykov — Mon, 22 Jun 2015 11:38:14 GMT

Hi Christian

if MDEN, IREN are set then UART is working in irda mode

SIR format. In this mode you should place irda transceiver

before UART input/output, however from user point of view

operation is similar to conventional UART.

So you should work with it in usual "UART" way.

SIR format provides ability to convert irda signal to such

form, that uart working with it as with usual UART signal (not irda).

~igor

Re: irda-mode Setting

myungjukim — Tue, 23 Jun 2015 00:29:05 GMT

Hi, igor.

I've already do usual "UART" way for SIR format.

I don't get any event also.

Is it sholud use other uart driver not freescale uart driver ?

Best Regards,

Re: irda-mode Setting

igorpadykov — Tue, 23 Jun 2015 00:41:12 GMT

Hi Christian

I think you should check signals by oscilloscope

on i.MX6 UART input.

Does uart work ok without irda converters, non-irda mode ?

Would "event", UART RDY appear without OS test,

say with i.MX 6Series Platform SDK : Bare-metal SDK for the i.MX 6 ?

~igor