Difference between revisions of "DESK-MX8M-L/Peripherals/UART"

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!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
 
!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
 
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|-  
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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"|ID#
 
!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"|Issue Date
 
!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"|Issue Date
 
!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"|{{oldid|15722|2021/12/30}}
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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|15722|15722}}
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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"|30/12/2021
 
|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-MX8M-L 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-MX8M-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:#edf8fb; padding:5px; color:#000000" |{{oldid|17608|2023/02/27}}
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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:#ededed; padding:5px; color:#000000" |{{oldid|17608|17608}}
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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-MX8M-L-2.0.0 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:#ededed; padding:5px; color:#000000" |27/02/2023
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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:#ededed; padding:5px; color:#000000" |DESK-MX8M-L-2.0.0 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" |{{oldid|19171|2023/08/22}}
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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:#ededed; padding:5px; color:#000000" |{{oldid|17608|17608}}
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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-MX8M-L-4.0.0 release
+
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#ededed; padding:5px; color:#000000" |26/07/2023
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|-
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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:#ededed; padding:5px; color:#000000" |DESK-MX8M-L-4.0.0 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:#ededed; padding:5px; color:#000000" |2024/04/11
 
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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:#ededed; padding:5px; color:#000000" |DESK-MX8M-L-4.1.0 release
 
 
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MX8MP_IOMUXC_ECSPI2_MISO__UART4_DCE_CTS 0x140
 
MX8MP_IOMUXC_ECSPI2_MISO__UART4_DCE_CTS 0x140
 
MX8MP_IOMUXC_ECSPI2_SS0__UART4_DCE_RTS 0x140
 
MX8MP_IOMUXC_ECSPI2_SS0__UART4_DCE_RTS 0x140
−
>;
 
−
};
 
−
 
−
pinctrl_uart4_j8: uart4grp {
 
−
fsl,pins = <
 
−
MX8MP_IOMUXC_UART4_TXD__UART4_DCE_TX 0x140
 
−
MX8MP_IOMUXC_UART4_RXD__UART4_DCE_RX 0x140
 
 
>;
 
>;
 
};
 
};
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Here below an example of device tree configuration used on standard DAVE's kit for the MITO 8M Mini SOM:
 
Here below an example of device tree configuration used on standard DAVE's kit for the MITO 8M Mini SOM:
  
−
From <code>imx8mm-mito8mmini.dtsi</code>:
+
From <code>imx8mm-mito8mmini.dts</code>:
  
 
<pre>
 
<pre>
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...
 
...
 
&uart1 {
 
&uart1 {
 +
pinctrl-names = "default";
 +
pinctrl-0 = <&pinctrl_uart1>;
 
assigned-clocks = <&clk IMX8MM_CLK_UART1>;
 
assigned-clocks = <&clk IMX8MM_CLK_UART1>;
 
assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
 
assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
−
status = "disabled";
+
fsl,uart-has-rtscts;
 +
status = "okay";
 
};
 
};
 
...
 
...
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&iomuxc {
 
&iomuxc {
 
...
 
...
 +
...
 +
pinctrl_uart1_en: uart1_en {
 +
fsl,pins = <
 +
MX8MM_IOMUXC_SAI5_RXD3_GPIO3_IO24 0x19
 +
>;
 +
};
 
...
 
...
 
pinctrl_uart1: uart1grp {
 
pinctrl_uart1: uart1grp {
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...
 
...
 
</pre>
 
</pre>
−
 
−
 
−
From <code>imx8mm-mito8mmini-sbcx.dts</code>:
 
−
 
−
<pre>
 
−
...
 
−
...
 
−
 
−
/ {
 
−
regulators: regulators {
 
−
...
 
−
...
 
−
/* enable ISL3330IAZ on SBCX at boot */
 
−
reg_uart1_en: uart1_en {
 
−
compatible = "regulator-fixed";
 
−
regulator-name = "uart1_en";
 
−
pinctrl-names = "default";
 
−
pinctrl-0 = <&pinctrl_uart1_en>;
 
−
regulator-min-microvolt = <3300000>;
 
−
regulator-max-microvolt = <3300000>;
 
−
gpio = <&gpio3 24 GPIO_ACTIVE_HIGH>;
 
−
enable-active-high;
 
−
regulator-always-on;
 
−
regulator-boot-on;
 
−
};
 
−
...
 
−
...
 
−
};
 
−
};
 
−
...
 
−
...
 
−
&uart1 {
 
−
pinctrl-names = "default";
 
−
pinctrl-0 = <&pinctrl_uart1>;
 
−
fsl,uart-has-rtscts;
 
−
status = "okay";
 
−
};
 
−
...
 
−
...
 
−
&iomuxc {
 
−
...
 
−
...
 
−
pinctrl_uart1_en: uart1_en {
 
−
fsl,pins = <
 
−
MX8MM_IOMUXC_SAI5_RXD3_GPIO3_IO24 0x19
 
−
>;
 
−
};
 
−
 
−
...
 
−
...
 
−
</pre>
 
−
 
  
 
===Accessing the peripheral in ORCA SOM===
 
===Accessing the peripheral in ORCA SOM===

Revision as of 06:32, 26 July 2023

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History
ID# Issue Date Notes

15722

30/12/2021 First DESK-MX8M-L release

17608

27/02/2023 DESK-MX8M-L-2.0.0 release

17608

26/07/2023 DESK-MX8M-L-4.0.0 release


Peripheral UART[edit | edit source]

Device tree configuration[edit | edit source]

ORCA SOM[edit | edit source]

Here below an example of device tree modifications to standard DAVE's kit for the ORCA SOM:

From imx8mp-mito8mplus.dtsi: 

...
...
&uart4 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_uart4_j8>;
	assigned-clocks = <&clk IMX8MP_CLK_UART4>;
	assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_80M>;
	/*fsl,uart-has-rtscts;*/
	status = "disabled";
};
...
...
&iomuxc {
...
...
	pinctrl_uart4: uart4grp {
		fsl,pins = <
			MX8MP_IOMUXC_ECSPI2_SCLK__UART4_DCE_RX		0x140
			MX8MP_IOMUXC_ECSPI2_MOSI__UART4_DCE_TX		0x140
			MX8MP_IOMUXC_ECSPI2_MISO__UART4_DCE_CTS		0x140
			MX8MP_IOMUXC_ECSPI2_SS0__UART4_DCE_RTS		0x140
		>;
	};
...

MITO 8M Mini[edit | edit source]

Here below an example of device tree configuration used on standard DAVE's kit for the MITO 8M Mini SOM:

From imx8mm-mito8mmini.dts: 

...
...
&uart1 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_uart1>;
	assigned-clocks = <&clk IMX8MM_CLK_UART1>;
	assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
	fsl,uart-has-rtscts;
	status = "okay";
};
...
...
&iomuxc {
...
...
	pinctrl_uart1_en: uart1_en {
		fsl,pins = <
			MX8MM_IOMUXC_SAI5_RXD3_GPIO3_IO24			 0x19
		>;
	};
...
	pinctrl_uart1: uart1grp {
		fsl,pins = <
			MX8MM_IOMUXC_UART1_RXD_UART1_DCE_RX	0x140
			MX8MM_IOMUXC_UART1_TXD_UART1_DCE_TX	0x140
			MX8MM_IOMUXC_UART3_RXD_UART1_DCE_CTS_B	0x140
			MX8MM_IOMUXC_UART3_TXD_UART1_DCE_RTS_B	0x140
		>;
	};
...
...

Accessing the peripheral in ORCA SOM[edit | edit source]

Linux messages at boot time[edit | edit source]

...
...
[    0.836042] 30860000.serial: ttymxc0 at MMIO 0x30860000 (irq = 31, base_baud = 5000000) is a IMX
[    0.843116] 30880000.serial: ttymxc2 at MMIO 0x30880000 (irq = 32, base_baud = 5000000) is a IMX
[    0.851863] 30890000.serial: ttymxc1 at MMIO 0x30890000 (irq = 33, base_baud = 1500000) is a IMX
[    0.860354] printk: console [ttymxc1] enabled
...
...

Usage with stty[edit | edit source]

N.B. UART mapping respect to ttymxcX is the following one: 

UART1 (RS232) <-> ttymxc0
UART2 (Serial Port) <-> ttymxc1
UART3 (UART) <-> ttymxc2
UART4 (RS485) <-> ttymxc3
...

root@desk-mx8mp:~# stty -F /dev/ttymxc0 115200 -echo -raw
root@desk-mx8mp:~# cat /dev/ttymxc0 > test_ttymxc0.log &
[1] 1868
root@desk-mx8mp:~# echo "Test loopback" > /dev/ttymxc0
root@desk-mx8mp:~# cat test_ttymxc0.log
Test loopback

root@desk-mx8mp:~#

Accessing the peripheral in MITO 8M Mini[edit | edit source]

Linux messages at boot time[edit | edit source]

...
...
[    0.812632] 30860000.serial: ttymxc0 at MMIO 0x30860000 (irq = 40, base_baud = 5000000) is a IMX                                                                                                                                           
[    0.860368] 30890000.serial: ttymxc1 at MMIO 0x30890000 (irq = 42, base_baud = 1500000) is a IMX                                                                                                                                           
[    0.869035] printk: console [ttymxc1] enabled
...
...

Usage with stty[edit | edit source]

N.B. UART mapping respect to ttymxcX is the following one: 

UART1 (RS232/RS485/RS422 port DB9) <-> ttymxc0
UART2 (Serial Port) <-> ttymxc1
UART3 (PMOD) <-> ttymxc2
UART4 (UART for Cortex-M4) <-> ttymxc3
...

root@desk-mx8mm:~# dmesg | grep tty^C
root@desk-mx8mm:~# stty -F /dev/ttymxc0 115200 -echo -raw
root@desk-mx8mm:~# cat /dev/ttymxc0 > test_ttymxc0.log &
[1] 1313
root@desk-mx8mm:~# echo "Test loopback" > /dev/ttymxc0
root@desk-mx8mm:~# cat test_ttymxc0.log 
Test loopback

root@desk-mx8mm:~#

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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