Difference between revisions of "DESK-MX8M-L/Peripherals/UART"
(Updates for DESK-MX8-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:#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"|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 | ||
| + | |- | ||
| + | | 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}} | ||
| + | | 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 | ||
| + | | 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 | ||
|- | |- | ||
! 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}} | ! 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}} | ||
| − | ! 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" | | + | ! 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 |
| − | ! 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- | + | ! 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 |
|- | |- | ||
| − | |||
|} | |} | ||
<section end=History/> | <section end=History/> | ||
| Line 34: | Line 37: | ||
... | ... | ||
&uart4 { | &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"; | |
}; | }; | ||
... | ... | ||
| Line 46: | Line 49: | ||
... | ... | ||
... | ... | ||
| − | + | 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 | |
| − | + | >; | |
| − | + | }; | |
| − | + | ... | |
</pre> | </pre> | ||
| Line 103: | Line 106: | ||
... | ... | ||
... | ... | ||
| − | [ 0. | + | [ 0.836042] 30860000.serial: ttymxc0 at MMIO 0x30860000 (irq = 31, base_baud = 5000000) is a IMX |
| − | [ 0. | + | [ 0.843116] 30880000.serial: ttymxc2 at MMIO 0x30880000 (irq = 32, base_baud = 5000000) is a IMX |
| − | [ 0. | + | [ 0.851863] 30890000.serial: ttymxc1 at MMIO 0x30890000 (irq = 33, base_baud = 1500000) is a IMX |
| − | [ 0. | + | [ 0.860354] printk: console [ttymxc1] enabled |
| − | |||
... | ... | ||
... | ... | ||
| Line 124: | Line 126: | ||
root@desk-mx8mp:~# stty -F /dev/ttymxc0 115200 -echo -raw | root@desk-mx8mp:~# stty -F /dev/ttymxc0 115200 -echo -raw | ||
root@desk-mx8mp:~# cat /dev/ttymxc0 > test_ttymxc0.log & | root@desk-mx8mp:~# cat /dev/ttymxc0 > test_ttymxc0.log & | ||
| − | [1] | + | [1] 1868 |
root@desk-mx8mp:~# echo "Test loopback" > /dev/ttymxc0 | root@desk-mx8mp:~# echo "Test loopback" > /dev/ttymxc0 | ||
root@desk-mx8mp:~# cat test_ttymxc0.log | root@desk-mx8mp:~# cat test_ttymxc0.log | ||
Test loopback | Test loopback | ||
| + | |||
| + | root@desk-mx8mp:~# | ||
</pre> | </pre> | ||
| Line 136: | Line 140: | ||
... | ... | ||
... | ... | ||
| − | [ 0. | + | [ 0.812632] 30860000.serial: ttymxc0 at MMIO 0x30860000 (irq = 40, base_baud = 5000000) is a IMX |
| − | [ 0. | + | [ 0.860368] 30890000.serial: ttymxc1 at MMIO 0x30890000 (irq = 42, base_baud = 1500000) is a IMX |
| − | [ 0. | + | [ 0.869035] printk: console [ttymxc1] enabled |
... | ... | ||
... | ... | ||
| Line 153: | Line 157: | ||
<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
| + | root@desk-mx8mm:~# dmesg | grep tty^C | ||
root@desk-mx8mm:~# stty -F /dev/ttymxc0 115200 -echo -raw | root@desk-mx8mm:~# stty -F /dev/ttymxc0 115200 -echo -raw | ||
root@desk-mx8mm:~# cat /dev/ttymxc0 > test_ttymxc0.log & | root@desk-mx8mm:~# cat /dev/ttymxc0 > test_ttymxc0.log & | ||
| − | [1] | + | [1] 1313 |
root@desk-mx8mm:~# echo "Test loopback" > /dev/ttymxc0 | root@desk-mx8mm:~# echo "Test loopback" > /dev/ttymxc0 | ||
root@desk-mx8mm:~# cat test_ttymxc0.log | root@desk-mx8mm:~# cat test_ttymxc0.log | ||
Test loopback | Test loopback | ||
| + | |||
| + | root@desk-mx8mm:~# | ||
</pre> | </pre> | ||
Revision as of 06:32, 26 July 2023
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| History | |||
|---|---|---|---|
| ID# | Issue Date | Notes | |
| 30/12/2021 | First DESK-MX8M-L release | ||
| 27/02/2023 | DESK-MX8M-L-2.0.0 release | ||
| 26/07/2023 | DESK-MX8M-L-4.0.0 release | ||
Contents
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
