Difference between revisions of "DESK-MX6UL-L/Peripherals/UART"
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Revision as of 18:01, 11 January 2024
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| History | |||
|---|---|---|---|
| Issue Date | Notes | ||
| First DESK-MX6UL-L release | |||
| DESK-MX6UL-L 3.0.0 release | |||
| 2023/05/04 | DESK-MX6UL-L 4.0.0 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 AXEL ULite SOM:
From the Carrier imx6ul-axelulite-cb003a.dts device tree:
&uart3 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart3>;
status = "okay";
};
...
...
&iomuxc {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_hog_gpios>;
imx6ul-axelulite {
...
...
uart {
pinctrl_uart3: uart3grp {
fsl,pins = <
MX6UL_PAD_UART3_RX_DATA__UART3_DCE_RX 0x1b0b1
MX6UL_PAD_UART3_TX_DATA__UART3_DCE_TX 0x1b0b1
>;
};
};
...
...
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 0.569198] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 30, base_baud = 5000000) is a IMX [ 1.344706] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 65, base_baud = 5000000) is a IMX ... ...
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 UART5 <-> ttymxc4 UART6 <-> ttymxc5 UART7 <-> ttymxc6 UART8 <-> ttymxc7 ...
For example, using a loopback HW connection (RX short circuited to TX on UART232 port) it is possible to test the send and receive data using the ttymxc2 device:
root@desk-mx6ul-axelulite:~# stty -F /dev/ttymxc2 115200 -echo root@desk-mx6ul-axelulite:~# cat /dev/ttymxc2 & [1] 267 root@desk-mx6ul-axelulite:~# echo "Test loopback" > /dev/ttymxc2 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
