arm: add uart echo app

arm/hal/uart/xuartlite_sinit.c

@@ -0,0 +1,122 @@
+/******************************************************************************
+* Copyright (C) 2005 - 2022 Xilinx, Inc.  All rights reserved.
+* SPDX-License-Identifier: MIT
+******************************************************************************/
+
+/****************************************************************************/
+/**
+*
+* @file xuartlite_sinit.c
+* @addtogroup uartlite_v3_7
+* @{
+*
+* The implementation of the XUartLite component's static initialization
+* functionality.
+*
+* <pre>
+* MODIFICATION HISTORY:
+*
+* Ver   Who  Date     Changes
+* ----- ---- -------- -----------------------------------------------
+* 1.01a jvb  10/13/05 First release
+* 2.00a ktn  10/20/09 Updated to use HAL Processor APIs.
+* </pre>
+*
+*****************************************************************************/
+
+/***************************** Include Files ********************************/
+
+#include "xstatus.h"
+#include "xparameters.h"
+#include "xuartlite_i.h"
+
+/************************** Constant Definitions ****************************/
+
+
+/**************************** Type Definitions ******************************/
+
+
+/***************** Macros (Inline Functions) Definitions ********************/
+
+
+/************************** Variable Definitions ****************************/
+
+
+/************************** Function Prototypes *****************************/
+
+/****************************************************************************
+*
+* Looks up the device configuration based on the unique device ID.  The table
+* UartliteConfigTable contains the configuration info for each device in the
+* system.
+*
+* @param	DeviceId is the unique device ID to match on.
+*
+* @return	A pointer to the configuration data for the device, or
+*		NULL if no match was found.
+*
+* @note		None.
+*
+******************************************************************************/
+XUartLite_Config *XUartLite_LookupConfig(u16 DeviceId)
+{
+	XUartLite_Config *CfgPtr = NULL;
+	u32 Index;
+
+	for (Index=0; Index < XPAR_XUARTLITE_NUM_INSTANCES; Index++) {
+		if (XUartLite_ConfigTable[Index].DeviceId == DeviceId) {
+			CfgPtr = &XUartLite_ConfigTable[Index];
+			break;
+		}
+	}
+
+	return CfgPtr;
+}
+
+/****************************************************************************/
+/**
+*
+* Initialize a XUartLite instance.  The receive and transmit FIFOs of the
+* UART are not flushed, so the user may want to flush them. The hardware
+* device does not have any way to disable the receiver such that any valid
+* data may be present in the receive FIFO. This function disables the UART
+* interrupt. The baudrate and format of the data are fixed in the hardware
+* at hardware build time.
+*
+* @param	InstancePtr is a pointer to the XUartLite instance.
+* @param	DeviceId is the unique id of the device controlled by this
+*		XUartLite instance.  Passing in a device id associates the
+*		generic XUartLite instance to a specific device, as chosen by
+*		the caller or application developer.
+*
+* @return
+* 		- XST_SUCCESS if everything starts up as expected.
+* 		- XST_DEVICE_NOT_FOUND if the device is not found in the
+*			configuration table.
+*
+* @note		None.
+*
+*****************************************************************************/
+int XUartLite_Initialize(XUartLite *InstancePtr, u16 DeviceId)
+{
+	XUartLite_Config *ConfigPtr;
+
+	/*
+	 * Assert validates the input arguments
+	 */
+	Xil_AssertNonvoid(InstancePtr != NULL);
+
+	/*
+	 * Lookup the device configuration in the configuration table. Use this
+	 * configuration info when initializing this component.
+	 */
+	ConfigPtr = XUartLite_LookupConfig(DeviceId);
+
+	if (ConfigPtr == (XUartLite_Config *)NULL) {
+		return XST_DEVICE_NOT_FOUND;
+	}
+	return XUartLite_CfgInitialize(InstancePtr, ConfigPtr,
+					ConfigPtr->RegBaseAddr);
+}
+
+/** @} */