DESK-MX8M-L/Peripherals/UART
< DESK-MX8M-L
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Contents
Peripheral UART[edit | edit source]
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the ORCA SOM:
From imx8mp-mito8mplus.dtsi:
&uart2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart2>;
status = "okay";
};
&iomuxc {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_hog>;
...
...
pinctrl_uart2: uart2grp {
fsl,pins = <
MX8MP_IOMUXC_UART2_RXD__UART2_DCE_RX 0x49
MX8MP_IOMUXC_UART2_TXD__UART2_DCE_TX 0x49
>;
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 0.754248] 30860000.serial: ttymxc0 at MMIO 0x30860000 (irq = 26, base_baud = 5000000) is a IMX [ 0.761203] 30880000.serial: ttymxc2 at MMIO 0x30880000 (irq = 27, base_baud = 5000000) is a IMX [ 0.769995] 30890000.serial: ttymxc1 at MMIO 0x30890000 (irq = 28, base_baud = 1500000) is a IMX ... ... root@desk-mx8mp:~#
Usage with stty[edit | edit source]
N.B. UART mapping respect to ttymxcX is the following one:
UART1 <-> ttymxc0 UART2 <-> ttymxc1 UART3 <-> ttymxc2 UART4 <-> ttymxc3 ...
root@desk-mx8mp:~# stty -F /dev/ttymxc2 115200 -echo root@desk-mx8mp:~# cat /dev/ttymxc2 & [2] 555 root@desk-mx8mp:~# echo "Test loopback" > /dev/ttymxc2 root@desk-mx8mp:~# Test loopback
Additional information[edit | edit source]
Serial ports can be used through the standard serial programming API.
For detailed information, please refer to the Serial Programming HOWTO at Serial-Programming-HOWTO
