wifiiot_uart-h.md - Openharmony v1.0 / docs / api / api-LinkIoT - 最全华为鸿蒙分布式操作系统技术资料库，手册，指南

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wifiiot_uart-h.md

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# wifiiot\_uart.h
## **Overview**
**Related Modules:**
[Wifiiot](Wifiiot.md)
**Description:**
Declares the UART interface functions.
These functions are used for UART initialization, data input/output, and data flow control.
**Since:**
1.0
**Version:**
1.0
## **Summary**
## Data Structures

Data Structure Name	Description
WifiIotUartAttribute	Defines the basic attributes of a UART device.
WifiIotUartExtraAttr	Defines the extended attributes of a UART device.

## Enumerations

Enumeration Name	Description
WifiIotUartIdx { WIFI_IOT_UART_IDX_0, WIFI_IOT_UART_IDX_1, WIFI_IOT_UART_IDX_2, WIFI_IOT_UART_IDX_MAX }	Enumerates the UART serial number.
WifiIotUartIdxDataBit { WIFI_IOT_UART_DATA_BIT_5 = 5, WIFI_IOT_UART_DATA_BIT_6, WIFI_IOT_UART_DATA_BIT_7, WIFI_IOT_UART_DATA_BIT_8 }	Enumerates the number of UART data bits.
WifiIotUartStopBit { WIFI_IOT_UART_STOP_BIT_1 = 1, WIFI_IOT_UART_STOP_BIT_2 = 2 }	Enumerates the number of UART stop bits.
WifiIotUartParity { WIFI_IOT_UART_PARITY_NONE = 0, WIFI_IOT_UART_PARITY_ODD = 1, WIFI_IOT_UART_PARITY_EVEN = 2 }	Enumerates the UART parity bit.
WifiIotUartFifoLine { WIFI_IOT_FIFO_LINE_ONE_EIGHT = 1, WIFI_IOT_FIFO_LINE_ONE_QUARTER, WIFI_IOT_FIFO_LINE_HALF, WIFI_IOT_FIFO_LINE_THREE_QUARTERS, WIFI_IOT_FIFO_LINE_SEVEN_EIGHTS }	Enumerates UART FIFO interrupt thresholds.
WifiIotUartBlockState { WIFI_IOT_UART_BLOCK_STATE_NONE_BLOCK = 1, WIFI_IOT_UART_BLOCK_STATE_BLOCK }	Enumerates UART block states.
WifiIotUartDmaState { WIFI_IOT_UART_NONE_DMA = 1, WIFI_IOT_UART_USE_DMA }	Enumerates UART DMA states.
WifiIotFlowCtrl { WIFI_IOT_FLOW_CTRL_NONE, WIFI_IOT_FLOW_CTRL_RTS_CTS, WIFI_IOT_FLOW_CTRL_RTS_ONLY, WIFI_IOT_FLOW_CTRL_CTS_ONLY }	Enumerates hardware flow control modes.

## Functions

Function Name	Description
UartInit (WifiIotUartIdx id, const WifiIotUartAttribute param, const WifiIotUartExtraAttr extraAttr)	unsigned int Configures a UART device.
UartRead (WifiIotUartIdx id, unsigned char *data, unsigned int dataLen)	int Reads data from a UART device.
UartWrite (WifiIotUartIdx id, const unsigned char *data, unsigned int dataLen)	int Writes data to a UART device.
UartDeinit (WifiIotUartIdx id)	unsigned int Deinitializes a UART device.
UartSetFlowCtrl (WifiIotUartIdx id, WifiIotFlowCtrl flowCtrl)	unsigned int Sets UART hardware flow control.