Difference between revisions of "DESK-MX6UL-L/Peripherals/UART"

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(UART section update for DESK-MX6UL-L release)
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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:#73B2C7; padding:5px; color:white" |Notes
 
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes
 
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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" |1.0.0
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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" |{{oldid|14247|1.0.0}}
 
| 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" |Apr 2021
 
| 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" |Apr 2021
 
| 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" |First DESK 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" |First DESK release
 
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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" |3.0.0
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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" |2.0.0
 
| 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
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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" |3.0.0 DESK release
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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" |DESK 3.0.0 release
 
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Here below an example of device tree configuration used on standard DAVE's kit for the [[AXEL ULite SOM]]:
 
Here below an example of device tree configuration used on standard DAVE's kit for the [[AXEL ULite SOM]]:
  
−
From the Carrier <code>imx6ul-lynx-som0013-cb002f.dts</code> device tree:
+
From the Carrier <code>imx6ul-axelulite-cb003a.dts</code> device tree:
 +
<pre>
 +
&uart3 {
 +
        pinctrl-names = "default";
 +
        pinctrl-0 = <&pinctrl_uart3>;
 +
        status = "okay";
 +
};
 +
...
 +
...
 +
&iomuxc {
 +
        pinctrl-names = "default";
 +
        pinctrl-0 = <&pinctrl_hog_gpios>;
  
−
[    1.163365] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 30, base_baud = 5000000) is a IMX
+
        imx6ul-axelulite {
−
 
+
...
−
[    1.923126] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 65, base_baud = 5000000) is a IMX
+
...
−
 
+
        uart {
−
and from <code>imx6ul-lynx-som0013.dtsi</code><pre>
+
                pinctrl_uart3: uart3grp {
−
pinctrl_uart1: uart1grp {
+
                        fsl,pins = <
−
fsl,pins = <
+
                                MX6UL_PAD_UART3_RX_DATA__UART3_DCE_RX   0x1b0b1
−
MX6UL_PAD_UART1_TX_DATA__UART1_DCE_TX 0x1b0b1
+
                                MX6UL_PAD_UART3_TX_DATA__UART3_DCE_TX   0x1b0b1
−
MX6UL_PAD_UART1_RX_DATA__UART1_DCE_RX 0x1b0b1
+
                        >;
−
>;
+
                };
−
};
+
        };
−
 
+
...
−
pinctrl_uart2: uart2grp {
+
...
−
fsl,pins = <
 
−
MX6UL_PAD_UART2_TX_DATA__UART2_DCE_TX 0x1b0b1
 
−
MX6UL_PAD_UART2_RX_DATA__UART2_DCE_RX 0x1b0b1
 
−
>;
 
−
};
 
−
 
 
−
pinctrl_uart2_flow: uart2grp-flow {
 
−
fsl,pins = <
 
−
MX6UL_PAD_UART2_TX_DATA__UART2_DCE_TX 0x1b0b1
 
−
MX6UL_PAD_UART2_RX_DATA__UART2_DCE_RX 0x1b0b1
 
−
MX6UL_PAD_UART2_CTS_B__UART2_DCE_CTS  0x1b0b1
 
−
MX6UL_PAD_UART2_RTS_B__UART2_DCE_RTS  0x1b0b1
 
−
>;
 
−
};
 
−
 
 
−
pinctrl_uart3: uart3grp {
 
−
fsl,pins = <
 
−
MX6UL_PAD_UART3_TX_DATA__UART3_DCE_TX 0x1b0b1
 
−
MX6UL_PAD_UART3_RX_DATA__UART3_DCE_RX 0x1b0b1
 
−
>;
 
−
};
 
−
 
 
−
pinctrl_uart3_flow: uart3grp-flow {
 
−
fsl,pins = <
 
−
MX6UL_PAD_UART3_TX_DATA__UART3_DCE_TX 0x1b0b1
 
−
MX6UL_PAD_UART3_RX_DATA__UART3_DCE_RX 0x1b0b1
 
−
MX6UL_PAD_UART3_CTS_B__UART3_DCE_CTS  0x1b0b1
 
−
MX6UL_PAD_UART3_RTS_B__UART3_DCE_RTS  0x1b0b1
 
−
>;
 
−
};
 
−
 
 
−
 
 
−
pinctrl_uart3_config: uart3grp-config {
 
−
fsl,pins = <
 
−
MX6UL_PAD_CSI_PIXCLK__GPIO4_IO18 0x80000000 /* MPUART1_ON */
 
−
MX6UL_PAD_SNVS_TAMPER5__GPIO5_IO05 0x80000000 /* MPUART1_DEN */
 
−
MX6UL_PAD_SNVS_TAMPER6__GPIO5_IO06 0x80000000 /* MPUART1_RXEN */
 
−
>;
 
−
};
 
−
 
 
−
pinctrl_uart8: uart8grp {
 
−
fsl,pins = <
 
−
MX6UL_PAD_LCD_DATA20__UART8_DCE_TX      0x1b0b1
 
−
MX6UL_PAD_LCD_DATA21__UART8_DCE_RX      0x1b0b1
 
−
>;
 
−
};
 
−
 
 
−
pinctrl_uart8_flow: uart8grp-1 {
 
−
fsl,pins = <
 
−
MX6UL_PAD_LCD_DATA20__UART8_DCE_TX      0x1b0b1
 
−
MX6UL_PAD_LCD_DATA21__UART8_DCE_RX      0x1b0b1
 
−
MX6UL_PAD_ENET2_RX_ER__UART8_DCE_RTS    0x80000000
 
−
MX6UL_PAD_ENET2_TX_CLK__UART8_DCE_CTS  0x80000000
 
−
>;
 
−
};
 
−
 
 
−
pinctrl_uart8_config: uart8grp-config {
 
−
fsl,pins = <
 
−
MX6UL_PAD_SNVS_TAMPER8__GPIO5_IO08 0x80000000 /* MPUART0_DEN */
 
−
MX6UL_PAD_SNVS_TAMPER9__GPIO5_IO09 0x80000000 /* MPUART0_RXEN */
 
−
MX6UL_PAD_CSI_MCLK__GPIO4_IO17 0x80000000 /* MPUART0_ON */
 
−
>;
 
−
};
 
 
</pre>
 
</pre>
  
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...
 
...
 
...
 
...
−
[    1.211906] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 30, base_baud = 5000000) is a IMX
+
[    0.437613] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 21, base_baud = 5000000) is a IMX
−
[    1.962230] 2024000.serial: ttymxc7 at MMIO 0x2024000 (irq = 31, base_baud = 5000000) is a IMX
+
[    1.167221] console [ttymxc0] enabled
−
[   1.974074] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 65, base_baud = 5000000) is a IMX
+
[    1.172839] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 58, base_baud = 5000000) is a IMX
−
[    1.985128] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 66, base_baud = 5000000) is a IMX
 
 
...
 
...
 
...
 
...
Line 136: Line 83:
  
 
<pre class="workstation-terminal">
 
<pre class="workstation-terminal">
−
root@desk-mx6ul-lynx:~# stty -F /dev/ttymxc7 115200 -echo                                                                                                                                                           
+
root@desk-mx6ul-axelulite:~# stty -F /dev/ttymxc2 115200 -echo                                                                                                                                                           
−
root@desk-mx6ul-lynx:~# cat /dev/ttymxc7 &                                                                                                                                                                         
+
root@desk-mx6ul-axelulite:~# cat /dev/ttymxc2 &                                                                                                                                                                         
 
[1] 266
 
[1] 266
−
root@desk-mx6ul-lynx:~# echo "Test loopback" > /dev/ttymxc7
+
root@desk-mx6ul-axelulite:~# echo "Test loopback" > /dev/ttymxc2
 
Test loopback
 
Test loopback
 
</pre>
 
</pre>

Revision as of 10:51, 16 March 2022

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History
Version Issue Date Notes

1.0.0

Apr 2021 First DESK release
2.0.0 Feb 2022 DESK 3.0.0 release


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]

...
...
[    0.437613] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 21, base_baud = 5000000) is a IMX
[    1.167221] console [ttymxc0] enabled
[    1.172839] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 58, 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 exmaple, using a loopback HW connection (RX shortcircuited to TX on UART232 port) it is possibile 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] 266
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

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