1 /* $Id: xscuwdt.c,v 1.1.2.1 2011/01/20 04:04:40 sadanan Exp $ */
2 /******************************************************************************
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32 ******************************************************************************/
33 /****************************************************************************/
37 * @addtogroup scuwdt_v2_1
40 * Contains the implementation of interface functions of the XScuWdt driver.
41 * See xscuwdt.h for a description of the driver.
44 * MODIFICATION HISTORY:
46 * Ver Who Date Changes
47 * ----- --- -------- ---------------------------------------------
48 * 1.00a sdm 01/15/10 First release
49 * 2.1 sk 02/26/15 Modified the code for MISRA-C:2012 compliance.
52 ******************************************************************************/
54 /***************************** Include Files *********************************/
58 /************************** Constant Definitions *****************************/
60 /**************************** Type Definitions *******************************/
62 /***************** Macros (Inline Functions) Definitions *********************/
64 /************************** Function Prototypes ******************************/
66 /************************** Variable Definitions *****************************/
68 /****************************************************************************/
71 * Initialize a specific watchdog timer instance/driver. This function
72 * must be called before other functions of the driver are called.
74 * @param InstancePtr is a pointer to the XScuWdt instance.
75 * @param ConfigPtr is the config structure.
76 * @param EffectiveAddress is the base address for the device. It could be
77 * a virtual address if address translation is supported in the
78 * system, otherwise it is the physical address.
81 * - XST_SUCCESS if initialization was successful.
82 * - XST_DEVICE_IS_STARTED if the device has already been started.
84 * @note This function enables the watchdog mode.
86 ******************************************************************************/
87 s32 XScuWdt_CfgInitialize(XScuWdt *InstancePtr,
88 XScuWdt_Config *ConfigPtr, u32 EffectiveAddress)
91 Xil_AssertNonvoid(InstancePtr != NULL);
92 Xil_AssertNonvoid(ConfigPtr != NULL);
93 Xil_AssertNonvoid(EffectiveAddress != 0x00U);
96 * If the device is started, disallow the initialize and return a
97 * status indicating it is started. This allows the user to stop the
98 * device and reinitialize, but prevents a user from inadvertently
101 if (InstancePtr->IsStarted == XIL_COMPONENT_IS_STARTED) {
102 CfgStatus = (s32)XST_DEVICE_IS_STARTED;
106 * Copy configuration into instance.
108 InstancePtr->Config.DeviceId = ConfigPtr->DeviceId;
111 * Save the base address pointer such that the registers of the block
112 * can be accessed and indicate it has not been started yet.
114 InstancePtr->Config.BaseAddr = EffectiveAddress;
115 InstancePtr->IsStarted = 0U;
118 * Put the watchdog timer in Watchdog mode.
120 XScuWdt_SetWdMode(InstancePtr);
123 * Indicate the instance is ready to use, successfully initialized.
125 InstancePtr->IsReady = XIL_COMPONENT_IS_READY;
127 CfgStatus =(s32)XST_SUCCESS;
132 /****************************************************************************/
135 * Start the watchdog counter of the device.
137 * @param InstancePtr is a pointer to the XScuWdt instance.
141 * @note User needs to select the appropriate mode (watchdog/timer)
142 * before using this API.
143 * See XScuWdt_SetWdMode/XScuWdt_SetTimerMode macros in
146 ******************************************************************************/
147 void XScuWdt_Start(XScuWdt *InstancePtr)
151 Xil_AssertVoid(InstancePtr != NULL);
152 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
155 * Read the contents of the Control register.
157 Register = XScuWdt_ReadReg(InstancePtr->Config.BaseAddr,
158 XSCUWDT_CONTROL_OFFSET);
161 * Set the 'watchdog enable' bit in the register.
163 Register |= XSCUWDT_CONTROL_WD_ENABLE_MASK;
166 * Update the Control register with the new value.
168 XScuWdt_WriteReg(InstancePtr->Config.BaseAddr,
169 XSCUWDT_CONTROL_OFFSET, Register);
172 * Indicate that the device is started.
174 InstancePtr->IsStarted = XIL_COMPONENT_IS_STARTED;
177 /****************************************************************************/
180 * Stop the watchdog timer.
182 * @param InstancePtr is a pointer to the XScuWdt instance.
188 ******************************************************************************/
189 void XScuWdt_Stop(XScuWdt *InstancePtr)
193 Xil_AssertVoid(InstancePtr != NULL);
194 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
197 * Read the contents of the Control register.
199 Register = XScuWdt_ReadReg(InstancePtr->Config.BaseAddr,
200 XSCUWDT_CONTROL_OFFSET);
203 * Clear the 'watchdog enable' bit in the register.
205 Register &= (u32)(~XSCUWDT_CONTROL_WD_ENABLE_MASK);
208 * Update the Control register with the new value.
210 XScuWdt_WriteReg(InstancePtr->Config.BaseAddr,
211 XSCUWDT_CONTROL_OFFSET, Register);
214 * Indicate that the device is stopped.
216 InstancePtr->IsStarted = 0U;