Difference between revisions of "DESK-MX6UL-L/Peripherals/UART"
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| − | [ 0. | + | [ 0.569198] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 30, base_baud = 5000000) is a IMX |
| − | [ 1. | + | [ 1.344706] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 65, base_baud = 5000000) is a IMX |
| − | |||
... | ... | ||
... | ... | ||
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| − | For | + | 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 <code>ttymxc2</code> device: |
<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
| − | root@desk-mx6ul-axelulite:~# stty -F /dev/ttymxc2 115200 -echo | + | root@desk-mx6ul-axelulite:~# stty -F /dev/ttymxc2 115200 -echo |
| − | root@desk-mx6ul-axelulite:~# cat /dev/ttymxc2 & | + | root@desk-mx6ul-axelulite:~# cat /dev/ttymxc2 & |
| − | [1] | + | [1] 267 |
root@desk-mx6ul-axelulite:~# echo "Test loopback" > /dev/ttymxc2 | root@desk-mx6ul-axelulite:~# echo "Test loopback" > /dev/ttymxc2 | ||
Test loopback | Test loopback | ||
Revision as of 15:12, 3 April 2023
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| History | |||
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| Apr 2021 | First DESK release | ||
| 2.0.0 | Feb 2022 | DESK 3.0.0 release | |
| 3.0.0 | Apr 2023 | DESK 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
