DESK-RZ-L/Peripherals/UART
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| Issue Date | Notes | ||
| 2025/12/16 | DESK-RZ-L-1.x.x release | ||
Contents
Peripheral UART[edit | edit source]
Configuration[edit | edit source]
These peripheral(s) can only be used with the following ConfigID(s) (see the associated BOM):
| ConfigID | Note |
|---|---|
| 2002 | Available UARTs: console, A, B, D |
| 2003 | Available UARTs: console, A, D (B - Bluetooth interface - pins are required to drive motors) |
Device tree configuration[edit | edit source]
Below is an example of a device tree configuration used on ZERO Evaluation Kit.
From rzt2h-dsab.dtsi:
...
// Console
&sci0 {
pinctrl-0 = <&sci0_pins>;
pinctrl-names = "default";
status = "okay";
};
...
&pinctrl {
// Done
sci0_pins: sci0 {
pinmux = <RZT2H_PORT_PINMUX(27, 5, 0x14)>, /* P27_5 TXD0 | B_D22 H26 */
<RZT2H_PORT_PINMUX(27, 4, 0x14)>; /* P27_4 RXD0 | B_D23 F25 */
};
...
};
From rzt2h-eb23-cb2002.dts:
...
// UART A
&sci3 {
pinctrl-0 = <&sci3_pins>;
pinctrl-names = "default";
/delete-property/dmas;
/delete-property/dma-names;
uart-has-rtscts;
status = "okay";
};
// UART B - BT
&sci1 {
pinctrl-0 = <&sci1_pins>;
pinctrl-names = "default";
/delete-property/dmas;
/delete-property/dma-names;
uart-has-rtscts;
status = "disabled";
};
// UART D
&sci5 {
pinctrl-0 = <&sci5_pins>;
pinctrl-names = "default";
status = "okay";
};
...
&pinctrl {
sci1_pins: sci1 {
pinmux = <RZT2H_PORT_PINMUX(11, 1, 0x14)>, /* P11_1 TXD1 | B_D13 C1 */
<RZT2H_PORT_PINMUX(11, 0, 0x14)>, /* P11_0 RXD0 | B_D14 C5 */
<RZT2H_PORT_PINMUX(11, 2, 0x14)>, /* P11_2 RTS1 | B_D15 C3 */
<RZT2H_PORT_PINMUX(11, 3, 0x14)>; /* P11_3 CTS1 | B_D16 D1 */
};
sci3_pins: sci3 {
pinmux = <RZT2H_PORT_PINMUX(13, 4, 0x14)>, /* P13_4 RXD3 | B_A14 B8 */
<RZT2H_PORT_PINMUX(13, 5, 0x14)>, /* P13_5 TXD3 | B_B13 B7 */
<RZT2H_PORT_PINMUX(13, 6, 0x14)>, /* P13_6 RTS3 | B_C13 A8 */
<RZT2H_PORT_PINMUX(13, 7, 0x14)>; /* P13_7 CTS3 | B_C14 C8 */
};
sci5_pins: sci5 {
pinmux = <RZT2H_PORT_PINMUX(16, 4, 0x14)>, /* P16_4 TXD5 | B_C23 A12 */
<RZT2H_PORT_PINMUX(16, 3, 0x14)>; /* P16_3 RXD5 | B_C22 B12 */
};
...
};
Accessing the peripheral[edit | edit source]
Linux[edit | edit source]
... [ 60.513530] 80005000.serial: ttySC0 at MMIO 0x80005000 (irq = 14, base_baud = 0) is a scif [ 61.831885] 80005400.serial: ttySC1 at MMIO 0x80005400 (irq = 18, base_baud = 0) is a scif [ 61.841098] 80005c00.serial: ttySC3 at MMIO 0x80005c00 (irq = 22, base_baud = 0) is a scif [ 61.850337] 81005000.serial: ttySC5 at MMIO 0x81005000 (irq = 26, base_baud = 0) is a sci ...
