Introduction
status, and modem status registers.The controller is structured with separate RX and TX data paths. Each path includes a 64-byte FIFO. The controller serializes and deserializes data
in the TX and RX FIFOs and includes a mode switch to support various loopback configurations for the RxD and TxD signals. The FIFO interrupt status bits support polling or interrupt
driven handler. Software reads and writes data bytes using the RX and TX data port registers.When using the UART in a modem-like application, the modem control module detects and
generates the modem handshake signals and also controls the receiver and transmitter paths according to the handshaking protocol.
The PS Uart is in Zynq Ultrascale+ MpSoC and Zynq platforms.
HW IP Features
- Programmable baud rate generator
- 64-byte receive and transmit FIFOs
- Programmable protocol:° 6, 7, or 8 data bits 1, 1.5, or 2 stop bits
- Odd, even, space, mark, or no parity
- Parity, framing and overrun error detection
- Line-break generation and detection
- Interrupts generation
- Automatic echo, local loopback, and remote loopback channel modes
- Modem control signals: CTS, RTS, DSR, DTR, RI, and DCD
Features supported in driver
- Programmable baud rate generator
- 64-byte receive and transmit FIFOs
- Programmable protocol:° 6, 7, or 8 data bits 1, 1.5, or 2 stop bits
- Odd, even, space, mark, or no parity
- Parity, framing and overrun error detection
- Line-break generation and detection
- Interrupts generation
- Automatic echo, local loopback, and remote loopback channel modes
- Modem control signals: CTS, RTS, DSR, DTR, RI, and DCD
Missing Features, Known Issues and Limitations
- None
Kernel Configuration
To enable the uart driver in the linux kernel you either have to integrate it or build it as kernel module (.ko). you can enable it with:CONFIG_SERIAL_XILINX_PS_UART=y CONFIG_SERIAL_XILINX_PS_UART_CONSOLE=y |
The driver statically allocates port data structures based on this configuration item. A kernel error similar to "Cannot get uart_port structure" may be seen during kernel boot when this is an issue.
CONFIG_SERIAL_XILINX_NR_UARTS=<number of expected UARTs> |
Here's how the devicetree entry could look like.
