1 /******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
\r
2 * File Name : stm32f10x_iwdg.c
\r
3 * Author : MCD Application Team
\r
4 * Date First Issued : 09/29/2006
\r
5 * Description : This file provides all the IWDG firmware functions.
\r
6 ********************************************************************************
\r
11 ********************************************************************************
\r
12 * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
\r
13 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
\r
14 * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
\r
15 * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
\r
16 * CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
\r
17 * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
\r
18 *******************************************************************************/
\r
20 /* Includes ------------------------------------------------------------------*/
\r
21 #include "stm32f10x_iwdg.h"
\r
23 /* Private typedef -----------------------------------------------------------*/
\r
24 /* Private define ------------------------------------------------------------*/
\r
25 /* ---------------------- IWDG registers bit mask ------------------------ */
\r
26 /* KR register bit mask */
\r
27 #define KR_Reload ((u16)0xAAAA)
\r
28 #define KR_Enable ((u16)0xCCCC)
\r
30 /* Private macro -------------------------------------------------------------*/
\r
31 /* Private variables ---------------------------------------------------------*/
\r
32 /* Private function prototypes -----------------------------------------------*/
\r
33 /* Private functions ---------------------------------------------------------*/
\r
35 /*******************************************************************************
\r
36 * Function Name : IWDG_WriteAccessCmd
\r
37 * Description : Enables or disables write access to IWDG_PR and IWDG_RLR
\r
39 * Input : - IWDG_WriteAccess: new state of write access to IWDG_PR and
\r
40 * IWDG_RLR registers.
\r
41 * This parameter can be one of the following values:
\r
42 * - IWDG_WriteAccess_Enable: Enable write access to
\r
43 * IWDG_PR and IWDG_RLR registers
\r
44 * - IWDG_WriteAccess_Disable: Disable write access to
\r
45 * IWDG_PR and IWDG_RLR registers
\r
48 *******************************************************************************/
\r
49 void IWDG_WriteAccessCmd(u16 IWDG_WriteAccess)
\r
51 /* Check the parameters */
\r
52 assert(IS_IWDG_WRITE_ACCESS(IWDG_WriteAccess));
\r
54 IWDG->KR = IWDG_WriteAccess;
\r
57 /*******************************************************************************
\r
58 * Function Name : IWDG_SetPrescaler
\r
59 * Description : Sets IWDG Prescaler value.
\r
60 * Input : - IWDG_Prescaler: specifies the IWDG Prescaler value.
\r
61 * This parameter can be one of the following values:
\r
62 * - IWDG_Prescaler_4: IWDG prescaler set to 4
\r
63 * - IWDG_Prescaler_8: IWDG prescaler set to 8
\r
64 * - IWDG_Prescaler_16: IWDG prescaler set to 16
\r
65 * - IWDG_Prescaler_32: IWDG prescaler set to 32
\r
66 * - IWDG_Prescaler_64: IWDG prescaler set to 64
\r
67 * - IWDG_Prescaler_128: IWDG prescaler set to 128
\r
68 * - IWDG_Prescaler_256: IWDG prescaler set to 256
\r
71 *******************************************************************************/
\r
72 void IWDG_SetPrescaler(u8 IWDG_Prescaler)
\r
74 /* Check the parameters */
\r
75 assert(IS_IWDG_PRESCALER(IWDG_Prescaler));
\r
77 IWDG->PR = IWDG_Prescaler;
\r
80 /*******************************************************************************
\r
81 * Function Name : IWDG_SetReload
\r
82 * Description : Sets IWDG Reload value.
\r
83 * Input : - Reload: specifies the IWDG Reload value.
\r
84 * This parameter must be a number between 0 and 0x0FFF.
\r
87 *******************************************************************************/
\r
88 void IWDG_SetReload(u16 Reload)
\r
90 /* Check the parameters */
\r
91 assert(IS_IWDG_RELOAD(Reload));
\r
96 /*******************************************************************************
\r
97 * Function Name : IWDG_ReloadCounter
\r
98 * Description : Reloads IWDG counter with value defined in the reload register
\r
99 * (write access to IWDG_PR and IWDG_RLR registers disabled).
\r
103 *******************************************************************************/
\r
104 void IWDG_ReloadCounter(void)
\r
106 IWDG->KR = KR_Reload;
\r
109 /*******************************************************************************
\r
110 * Function Name : IWDG_Enable
\r
111 * Description : Enables IWDG (write access to IWDG_PR and IWDG_RLR registers
\r
116 *******************************************************************************/
\r
117 void IWDG_Enable(void)
\r
119 IWDG->KR = KR_Enable;
\r
122 /*******************************************************************************
\r
123 * Function Name : IWDG_GetFlagStatus
\r
124 * Description : Checks whether the specified IWDG flag is set or not.
\r
125 * Input : - IWDG_FLAG: specifies the flag to check.
\r
126 * This parameter can be one of the following values:
\r
127 * - IWDG_FLAG_PVU: Prescaler Value Update on going
\r
128 * - IWDG_FLAG_RVU: Reload Value Update on going
\r
130 * Return : The new state of IWDG_FLAG (SET or RESET).
\r
131 *******************************************************************************/
\r
132 FlagStatus IWDG_GetFlagStatus(u16 IWDG_FLAG)
\r
134 FlagStatus bitstatus = RESET;
\r
136 /* Check the parameters */
\r
137 assert(IS_IWDG_FLAG(IWDG_FLAG));
\r
139 if ((IWDG->SR & IWDG_FLAG) != (u32)RESET)
\r
148 /* Return the flag status */
\r
152 /******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
\r