2c8f92039d
Added initial support Xilinx Embedded Software. Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
230 lines
8.2 KiB
C
Executable file
230 lines
8.2 KiB
C
Executable file
/******************************************************************************
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*
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* Copyright (C) 2005 - 2014 Xilinx, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* Use of the Software is limited solely to applications:
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* (a) running on a Xilinx device, or
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* (b) that interact with a Xilinx device through a bus or interconnect.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* XILINX CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of the Xilinx shall not be used
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* in advertising or otherwise to promote the sale, use or other dealings in
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* this Software without prior written authorization from Xilinx.
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*
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******************************************************************************/
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/*****************************************************************************/
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/**
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*
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* @file xcan_config.c
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*
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* Functions in this file are CAN Configuration Register access related.
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*
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* <pre>
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* MODIFICATION HISTORY:
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*
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* Ver Who Date Changes
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* ----- ---- -------- -------------------------------------------------------
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* 1.00a xd 04/12/05 First release
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* 1.10a mta 05/13/07 Updated to new coding style
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* 2.00a ktn 10/22/09 Updated to use the HAL APIs/macros.
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* The macros have been renamed to remove _m from the name.
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* </pre>
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******************************************************************************/
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/***************************** Include Files *********************************/
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#include "xil_types.h"
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#include "xil_assert.h"
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#include "xcan.h"
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/************************** Constant Definitions *****************************/
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/**************************** Type Definitions *******************************/
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/***************** Macros (Inline Functions) Definitions *********************/
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/************************** Function Prototypes ******************************/
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/*****************************************************************************/
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/**
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*
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* This routine sets Baud Rate Prescaler value. The system clock for the CAN
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* controller is divided by (Prescaler + 1) to generate the quantum clock
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* needed for sampling and synchronization. Read the device specification
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* for details.
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*
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* Baud Rate Prescaler could be set only after CAN device entered Configuration
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* Mode. So please call XCan_EnterMode() to enter Configuration Mode before
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* using this function.
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*
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* @param InstancePtr is a pointer to the XCan instance to be worked on.
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* @param Prescaler is the value to set. Valid values are from 0 to 255.
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*
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* @return
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* - XST_SUCCESS if the Baud Rate Prescaler value is set
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* successfully.
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* - XST_FAILURE if CAN device is not in Configuration Mode.
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*
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* @note None.
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*
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******************************************************************************/
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int XCan_SetBaudRatePrescaler(XCan *InstancePtr, u8 Prescaler)
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{
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Xil_AssertNonvoid(InstancePtr != NULL);
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Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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/*
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* Return error code if the device currently is NOT in Configuration
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* Mode
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*/
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if (XCan_GetMode(InstancePtr) != XCAN_MODE_CONFIG) {
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return XST_FAILURE;
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}
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XCan_WriteReg(InstancePtr->BaseAddress, XCAN_BRPR_OFFSET,
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(u32) Prescaler);
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return XST_SUCCESS;
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}
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/*****************************************************************************/
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/**
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*
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* This routine gets Baud Rate Prescaler value. The system clock for the CAN
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* controller is divided by (Prescaler + 1) to generate the quantum clock
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* needed for sampling and synchronization. Read the device specification for
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* details.
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*
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* @param InstancePtr is a pointer to the XCan instance to be worked on.
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*
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* @return Current used Baud Rate Prescaler value. The value's range is
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* from 0 to 255.
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*
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* @note None.
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*
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******************************************************************************/
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u8 XCan_GetBaudRatePrescaler(XCan *InstancePtr)
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{
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u8 Result;
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Xil_AssertNonvoid(InstancePtr != NULL);
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Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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Result = (u8) XCan_ReadReg(InstancePtr->BaseAddress, XCAN_BRPR_OFFSET);
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return Result;
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}
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/*****************************************************************************/
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/**
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*
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* This routine sets Bit time. Time segment 1, Time segment 2 and
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* Synchronization Jump Width are set in this function. Device specification
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* requires the values passed into this function be one less than the actual
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* values of these fields. Read the device specification for details.
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*
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* Bit time could be set only after CAN device entered Configuration Mode.
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* Please call XCan_EnterMode() to enter Configuration Mode before using this
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* function.
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*
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* @param InstancePtr is a pointer to the XCan instance to be worked on.
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* @param SyncJumpWidth is the Synchronization Jump Width value to set.
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* Valid values are from 0 to 3.
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* @param TimeSegment2 is the Time Segment 2 value to set. Valid values
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* are from 0 to 7.
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* @param TimeSegment1 is the Time Segment 1 value to set. Valid values
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* are from 0 to 15.
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*
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* @return
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* - XST_SUCCESS if the Bit time is set successfully.
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* - XST_FAILURE if CAN device is not in Configuration Mode.
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* - XST_INVALID_PARAM if any value of SyncJumpWidth, TimeSegment2
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* and TimeSegment1 is invalid.
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*
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* @note None.
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*
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******************************************************************************/
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int XCan_SetBitTiming(XCan *InstancePtr, u8 SyncJumpWidth,
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u8 TimeSegment2, u8 TimeSegment1)
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{
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u32 Value;
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Xil_AssertNonvoid(InstancePtr != NULL);
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Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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if (SyncJumpWidth > 3 || TimeSegment2 > 7 || TimeSegment1 > 15) {
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return XST_INVALID_PARAM;
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}
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/* Return error code if the device is NOT in Configuration Mode */
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if (XCan_GetMode(InstancePtr) != XCAN_MODE_CONFIG) {
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return XST_FAILURE;
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}
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Value = ((u32) TimeSegment1) & XCAN_BTR_TS1_MASK;
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Value |= (((u32) TimeSegment2) << XCAN_BTR_TS2_SHIFT) &
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XCAN_BTR_TS2_MASK;
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Value |= (((u32) SyncJumpWidth) << XCAN_BTR_SJW_SHIFT) &
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XCAN_BTR_SJW_MASK;
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XCan_WriteReg(InstancePtr->BaseAddress, XCAN_BTR_OFFSET, Value);
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return XST_SUCCESS;
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}
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/*****************************************************************************/
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/**
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*
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* This routine gets Bit time. Time segment 1, Time segment 2 and
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* Synchronization Jump Width values are read in this function. According to
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* device specification, the actual value of each of these fields is one
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* more than the value read. Read the device specification for details.
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*
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* @param InstancePtr is a pointer to the XCan instance to be worked on.
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* @param SyncJumpWidth will store the Synchronization Jump Width value
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* after this function returns. Its value ranges from 0 to 3.
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* @param TimeSegment2 will store the Time Segment 2 value after this
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* function returns. Its value ranges from 0 to 7.
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* @param TimeSegment1 will store the Time Segment 1 value after this
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* function returns. Its value ranges from 0 to 15.
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*
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* @return None.
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*
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* @note None.
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*
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******************************************************************************/
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void XCan_GetBitTiming(XCan *InstancePtr, u8 *SyncJumpWidth,
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u8 *TimeSegment2, u8 *TimeSegment1)
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{
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u32 Value;
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Xil_AssertVoid(InstancePtr != NULL);
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Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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Value = XCan_ReadReg(InstancePtr->BaseAddress, XCAN_BTR_OFFSET);
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*TimeSegment1 = (u8) (Value & XCAN_BTR_TS1_MASK);
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*TimeSegment2 =
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(u8) ((Value & XCAN_BTR_TS2_MASK) >> XCAN_BTR_TS2_SHIFT);
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*SyncJumpWidth =
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(u8) ((Value & XCAN_BTR_SJW_MASK) >> XCAN_BTR_SJW_SHIFT);
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}
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