TS-7250-V3 TS-ISO485: Difference between revisions
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#address-cells = <0x1>; | #address-cells = <0x1>; | ||
#size-cells = <0x1>; | #size-cells = <0x1>; | ||
/* TS-ISO485 COMA */ | /* TS-ISO485 COMA */ | ||
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interrupt-parent = <&fpga_intc>; | interrupt-parent = <&fpga_intc>; | ||
interrupts = <15>; | interrupts = <15>; | ||
}; | }; | ||
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interrupt-parent = <&fpga_intc>; | interrupt-parent = <&fpga_intc>; | ||
interrupts = <15>; | interrupts = <15>; | ||
}; | }; | ||
}; | }; |
Revision as of 10:58, 10 May 2023
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8-bit IO |
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The TS-ISO485 provides two isolated half duplex RS-485 ports, or two isolated RS-422 ports.
Refer to the TS-ISO485 manual for more information about the hardware UART usage.
The TS-ISO485 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.
This below example will set up the serial devices for a TS-ISO485 with the IRQ2,IRQ4, and SHARE jumpers installed. Open the device tree at arch/arm/boot/dts/imx6ul-ts7250v3.dts. 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-ISO485 COMA */
ts16550@3e8 {
compatible = "technologic,ts16550";
reg = <0x3e8 8>;
interrupt-parent = <&fpga_intc>;
interrupts = <15>;
};
/* TS-ISO485 COMB */
ts16550@2e8 {
compatible = "technologic,ts16550";
reg = <0x2e8 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@3e8: Adding 16550 UART ttyS0 [ 2.268166] ts16550 50004050.fpgaisa:ts16550@2e8: 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.