TS-7250-V3 TS-SER4: Difference between revisions
No edit summary |
No edit summary |
||
(2 intermediate revisions by 2 users not shown) | |||
Line 12: | Line 12: | ||
The TS-SER4 supports 4 UARTs as RS-232, RS-485, or RS-422. Refer to the [[TS-SER4|TS-SER4 manual for hardware documentation]]. | The TS-SER4 supports 4 UARTs as RS-232, RS-485, or RS-422. Refer to the [[TS-SER4|TS-SER4 manual for hardware documentation]]. | ||
{{:TS-7250-V3 16550 Notes}} | |||
This below example will set up the serial devices for a TS-SER4 with the IRQ2, IRQ4 (selects IRQ6), and COM1 jumpers installed. Open the device tree at arch/arm/boot/dts/imx6ul-ts7250v3. | This below example will set up the serial devices for a TS-SER4 with the IRQ2, IRQ4 (selects IRQ6), and COM1 jumpers installed. Open the device tree at arch/arm/boot/dts/imx6ul-ts7250v3.dtsi. Add the highlighted section to the device tree and recompile. | ||
<source lang=json highlight=" | <source lang=json highlight="6-40" line> | ||
pc104bus: fpgaisa@50 { | pc104bus: fpgaisa@50 { | ||
... | |||
#address-cells = <0x1>; | #address-cells = <0x1>; | ||
#size-cells = <0x1>; | #size-cells = <0x1>; | ||
/* COMA */ | /* COMA */ | ||
Line 34: | Line 27: | ||
reg = <0x3f8 8>; | reg = <0x3f8 8>; | ||
interrupt-parent = <&fpga_intc>; | interrupt-parent = <&fpga_intc>; | ||
interrupts = <15> | interrupts = <15 IRQ_TYPE_LEVEL_HIGH>; | ||
}; | }; | ||
Line 45: | Line 36: | ||
reg = <0x2f8 8>; | reg = <0x2f8 8>; | ||
interrupt-parent = <&fpga_intc>; | interrupt-parent = <&fpga_intc>; | ||
interrupts = <15> | interrupts = <15 IRQ_TYPE_LEVEL_HIGH>; | ||
}; | }; | ||
Line 56: | Line 45: | ||
reg = <0x3e8 8>; | reg = <0x3e8 8>; | ||
interrupt-parent = <&fpga_intc>; | interrupt-parent = <&fpga_intc>; | ||
interrupts = <15> | interrupts = <15 IRQ_TYPE_LEVEL_HIGH>; | ||
}; | }; | ||
Line 67: | Line 54: | ||
reg = <0x2e8 8>; | reg = <0x2e8 8>; | ||
interrupt-parent = <&fpga_intc>; | interrupt-parent = <&fpga_intc>; | ||
interrupts = <15> | interrupts = <15 IRQ_TYPE_LEVEL_HIGH>; | ||
}; | }; | ||
}; | }; |
Latest revision as of 10:37, 29 September 2023
Product Page | |
8-bit IO |
---|
The TS-SER4 supports 4 UARTs as RS-232, RS-485, or RS-422. Refer to the TS-SER4 manual for hardware documentation.
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-SER4 with the IRQ2, IRQ4 (selects IRQ6), and COM1 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 {
...
#address-cells = <0x1>;
#size-cells = <0x1>;
/* COMA */
ts16550@3f8 {
compatible = "technologic,ts16550";
reg = <0x3f8 8>;
interrupt-parent = <&fpga_intc>;
interrupts = <15 IRQ_TYPE_LEVEL_HIGH>;
};
/* COMB */
ts16550@2f8 {
compatible = "technologic,ts16550";
reg = <0x2f8 8>;
interrupt-parent = <&fpga_intc>;
interrupts = <15 IRQ_TYPE_LEVEL_HIGH>;
};
/* COMC */
ts16550@3e8 {
compatible = "technologic,ts16550";
reg = <0x3e8 8>;
interrupt-parent = <&fpga_intc>;
interrupts = <15 IRQ_TYPE_LEVEL_HIGH>;
};
/* COMD */
ts16550@2e8 {
compatible = "technologic,ts16550";
reg = <0x2e8 8>;
interrupt-parent = <&fpga_intc>;
interrupts = <15 IRQ_TYPE_LEVEL_HIGH>;
};
};
On the next boot check the "dmesg" output to verify it loaded:
root@tsimx6:~# dmesg | grep ts16550 [ 2.259413] ts16550 50004050.fpgaisa:ts16550@3f8: Adding 16550 UART ttyS0 [ 2.268166] ts16550 50004050.fpgaisa:ts16550@2f8: Adding 16550 UART ttyS1 [ 2.278539] ts16550 50004050.fpgaisa:ts16550@3e8: Adding 16550 UART ttyS2 [ 2.287455] ts16550 50004050.fpgaisa:ts16550@2e8: Adding 16550 UART ttyS3
Now that these are loaded:
Device | Description |
---|---|
/dev/ttyS0 | COMA |
/dev/ttyS1 | COMB |
/dev/ttyS3 | COMC |
/dev/ttyS4 | COMD |