Difference between revisions of "DESK-MX6-L/Pheripherals/UART"
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |Feb 2022 | | style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |Feb 2022 | ||
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |DESK 3.0.0 release | | style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |DESK 3.0.0 release | ||
Revision as of 15:28, 3 March 2022
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| History | |||
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| Version | Issue Date | Notes | |
| Oct 2020 | First DESK release | ||
| 2.0.0 | Feb 2022 | DESK 3.0.0 release | |
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 AXELLite SOM:
From imx6qdl-sbcx-revb-common.dtsi:
&uart2 {
fsl,uart-has-rtscts;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_dwm_uart2_1>;
status = "okay";
};
From imx6qdl-axelcommon.dtsi:
uart2 {
pinctrl_dwm_uart2_1: dwm_uart2_grp-1 {
fsl,pins = <
MX6QDL_PAD_SD3_DAT4__UART2_RX_DATA 0x1b0b1
MX6QDL_PAD_SD3_DAT5__UART2_TX_DATA 0x1b0b1
MX6QDL_PAD_SD3_CMD__UART2_CTS_B 0x1b0b1
MX6QDL_PAD_SD3_CLK__UART2_RTS_B 0x1b0b1
>;
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 1.010016] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 78, base_baud = 5000000) is a IMX [ 1.011009] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 79, base_baud = 5000000) is a IMX [ 2.198543] 21f0000.serial: ttymxc3 at MMIO 0x21f0000 (irq = 80, base_baud = 5000000) is a IMX [ 2.208297] 21f4000.serial: ttymxc4 at MMIO 0x21f4000 (irq = 81, base_baud = 5000000) is a IMX ... ... root@imx6qxelk:~#
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-mx6:~# stty -F /dev/ttymxc3 115200 -echo root@desk-mx6:~# cat /dev/ttymxc3 & [2] 555 root@desk-mx6:~# echo "Test loopback" > /dev/ttymxc3 root@desk-mx6:~# 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
