TS-7250-V3 TS-SER2: Difference between revisions
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The TS-SER2 provides two RS-232, RS-485 half duplex or full duplex (RS-422) ports and a parallel port. | The TS-SER2 provides two RS-232, RS-485 half duplex or full duplex (RS-422) ports and a parallel port. Refer to the [[TS-SER2]] manual for hardware documentation. The parallel port is currently not supported on this platform. | ||
{{:TS-7250-V3 16550 Notes}} | |||
This below example will set up the serial devices for a TS-SER2 with JP 14 through JP18, COMB 6, and COMA 5 jumpers installed. Open the device tree at arch/arm/boot/dts/imx6ul-ts7250v3.dtsi. Add the highlighted section to the device tree and recompile. | |||
This below example will set up the serial devices for a TS- | |||
<source lang=json highlight="13-33" line> | <source lang=json highlight="13-33" line> | ||
pc104bus: fpgaisa@50 { | pc104bus: fpgaisa@50 { | ||
| Line 29: | Line 25: | ||
#address-cells = <0x1>; | #address-cells = <0x1>; | ||
#size-cells = <0x1>; | #size-cells = <0x1>; | ||
/* TS-SER2 COMA */ | /* TS-SER2 COMA */ | ||
| Line 39: | Line 33: | ||
interrupt-parent = <&fpga_intc>; | interrupt-parent = <&fpga_intc>; | ||
interrupts = <14>; | interrupts = <14>; | ||
}; | }; | ||
| Line 50: | Line 42: | ||
interrupt-parent = <&fpga_intc>; | interrupt-parent = <&fpga_intc>; | ||
interrupts = <15>; | interrupts = <15>; | ||
}; | }; | ||
}; | }; | ||
Latest revision as of 10:32, 29 September 2023
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| 8-bit IO |
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The TS-SER2 provides two RS-232, RS-485 half duplex or full duplex (RS-422) ports and a parallel port. Refer to the TS-SER2 manual for hardware documentation. The parallel port is currently not supported on this platform.
This peripheral implements 16550A based UARTs which require a kernel driver. Under Linux this requires a device tree change. See the Kernel compile section for more details about getting set up the compile the kernel.
In general for 16550 UARTs we recommend these kernel config options:
CONFIG_HZ_PERIODIC=y
CONFIG_HZ_1000=y
CONFIG_SERIAL_8250_TS=y
The default kernel is ideal for low power, but has some tradeoffs with latency. A 16550 only has a 16 byte FIFO and needs to be serviced with relatively low latency, so a the above options make the latency far more deterministic. These changes are necessary to run at 115200 and not drop any data.
This below example will set up the serial devices for a TS-SER2 with JP 14 through JP18, COMB 6, and COMA 5 jumpers installed. Open the device tree at arch/arm/boot/dts/imx6ul-ts7250v3.dtsi. Add the highlighted section to the device tree and recompile.
pc104bus: fpgaisa@50 {
compatible = "technologic,pc104-bus";
reg = <0x50 0x4>;
ranges = <0 0 0x1000>;
reset-gpio = <&gpio3 7 0>;
#address-cells = <0x1>;
#size-cells = <0x1>;
/* TS-SER2 COMA */
ts16550@2e8 {
compatible = "technologic,ts16550";
reg = <0x2e8 8>;
interrupt-parent = <&fpga_intc>;
interrupts = <14>;
};
/* TS-SER2 COMB */
ts16550@3e8 {
compatible = "technologic,ts16550";
reg = <0x3e8 8>;
interrupt-parent = <&fpga_intc>;
interrupts = <15>;
};
};
On the next boot check the "dmesg" output to verify it loaded:
root@tsimx6:~# dmesg | grep ts16550 [ 2.259413] ts16550 50004050.fpgaisa:ts16550@2e8: Adding 16550 UART ttyS0 [ 2.268166] ts16550 50004050.fpgaisa:ts16550@3e8: Adding 16550 UART ttyS1
Now that these are loaded:
| Device | Description |
|---|---|
| /dev/ttyS0 | COMA |
| /dev/ttyS1 | COMB |
In this mode COMA/COMB are full duplex RS-485 (RS-422). See the TS-ISO485 manual for mroe details on the HD jumpers to use half duplex.