Hello,
I am trying to get irda SIR to work on my i.mx6ull based SoM. I would like to use the IRCOMM driver within linux to access devices using a UART, but the ircomm1 and ircomm2 devices hang the system when I write to them.
I have enabled the related settings in the kernel config file.
CONFIG_IRDA=y
CONFIG_IRCOMM=y
I also verified that the .dts file has the "fsl,irda-mode" string within the desired uart section.
&uart2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart2>;
uart-has-rtscts;
fsl,irda-mode;
status = "okay";
};
After these steps I am able to see ircomm* devices in /dev/tty, so the kernel has been correctly modified.
/dev/tty
ircomm0
ircomm1
ircomm2
I also enabled raw writes on the device using stty. (uart2 is mapped to ttymxc1 on this SoM)
stty -F /dev/ircomm1 raw -echo -echoe -echok
stty -F /dev/ircomm1 115200
Sadly the command to write to the ircomm port still hangs.
echo hello > /dev/ircomm1
In the past I have manually set the processor registers using imx-test/memtool, and this forces the standard ttymxc1 port to operate as an irda port.
/unit_tests/memtool CCM.CCGR0.CG14=1 #uart2 clock enable
/unit_tests/memtool UART2.UCR1.IREN=1 #uart2 irda enable
But I would like to avoid having to use imx-test->memtool because imx-test is difficult to incorporate using buildroot. If I must use Yocto to get Irda to work then I will, but I'd rather not because the build times are substantial.
Do I need to enable hardware handling with irda-utils -> irattach?
Is there a different tool supported in buildroot which can adjust the processor memory?
Any suggestions are appreciated.
It looks like those resources are for Linux kernel versions 2.4.x and 2.6.x. I am using Linux version 4.9.x
I will post on the Linux-IrDA project and see if someone can help. The unfortunate lack of support for this technology is sad because IrDA still serves a niche set of wireless communication needs. NFC and BTLE are both higher power than IrDA by a significant margin if you only need to communicate a short distance.
Hi
one can look at "Common Pitfalls" described on
and post issue on irda mail list
The Linux-IrDA Project / Mailing Lists
Best regards
igor
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