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comparison libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/IWDG/IWDG_Reset/main.c @ 0:c59513fd84fb

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Initial commit of STM32 test code.
author Daniel O'Connor <darius@dons.net.au>
date Mon, 03 Oct 2011 21:19:15 +1030
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1 /**
2 ******************************************************************************
3 * @file IWDG/IWDG_Reset/main.c
4 * @author MCD Application Team
5 * @version V3.5.0
6 * @date 08-April-2011
7 * @brief Main program body.
8 ******************************************************************************
9 * @attention
10 *
11 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
12 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
13 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
14 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
15 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
16 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
17 *
18 * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
19 ******************************************************************************
20 */
21
22 /* Includes ------------------------------------------------------------------*/
23 #include "stm32f10x.h"
24 #include "stm32_eval.h"
25
26 /** @addtogroup STM32F10x_StdPeriph_Examples
27 * @{
28 */
29
30 /** @addtogroup IWDG_Reset
31 * @{
32 */
33
34 /* Private typedef -----------------------------------------------------------*/
35 /* Private define ------------------------------------------------------------*/
36 /* Uncomment/Comment depending on your STM32 device.
37 The LSI is internally connected to TIM5 IC4 only on STM32F10x Connectivity
38 line, High-Density Value line, High-Density and XL-Density Devices */
39 #define LSI_TIM_MEASURE
40
41 /* Private macro -------------------------------------------------------------*/
42 /* Private variables ---------------------------------------------------------*/
43 __IO uint32_t TimingDelay = 0;
44 __IO uint32_t LsiFreq = 40000;
45 extern __IO uint16_t CaptureNumber;
46
47 /* Private function prototypes -----------------------------------------------*/
48 void Delay(__IO uint32_t nTime);
49 void TIM5_ConfigForLSI(void);
50
51 /* Private functions ---------------------------------------------------------*/
52
53 /**
54 * @brief Main program.
55 * @param None
56 * @retval None
57 */
58 int main(void)
59 {
60 /*!< At this stage the microcontroller clock setting is already configured,
61 this is done through SystemInit() function which is called from startup
62 file (startup_stm32f10x_xx.s) before to branch to application main.
63 To reconfigure the default setting of SystemInit() function, refer to
64 system_stm32f10x.c file
65 */
66
67 /* Initialize LED1 and Key Button mounted on STM3210X-EVAL board */
68 STM_EVAL_LEDInit(LED1);
69 STM_EVAL_LEDInit(LED2);
70 STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
71
72 /* Setup SysTick Timer for 1 msec interrupts */
73 if (SysTick_Config(SystemCoreClock / 1000))
74 {
75 /* Capture error */
76 while (1);
77 }
78
79
80 /* Check if the system has resumed from IWDG reset */
81 if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET)
82 {
83 /* IWDGRST flag set */
84 /* Turn on LED1 */
85 STM_EVAL_LEDOn(LED1);
86
87 /* Clear reset flags */
88 RCC_ClearFlag();
89 }
90 else
91 {
92 /* IWDGRST flag is not set */
93 /* Turn off LED1 */
94 STM_EVAL_LEDOff(LED1);
95 }
96
97 #ifdef LSI_TIM_MEASURE
98 /* Enable the LSI OSC */
99 RCC_LSICmd(ENABLE);
100
101 /* Wait till LSI is ready */
102 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
103 {}
104
105 /* TIM Configuration -------------------------------------------------------*/
106 TIM5_ConfigForLSI();
107
108 /* Wait until the TIM5 get 2 LSI edges */
109 while(CaptureNumber != 2)
110 {
111 }
112
113 /* Disable TIM5 CC4 Interrupt Request */
114 TIM_ITConfig(TIM5, TIM_IT_CC4, DISABLE);
115 #endif
116
117 /* IWDG timeout equal to 250 ms (the timeout may varies due to LSI frequency
118 dispersion) */
119 /* Enable write access to IWDG_PR and IWDG_RLR registers */
120 IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
121
122 /* IWDG counter clock: LSI/32 */
123 IWDG_SetPrescaler(IWDG_Prescaler_32);
124
125 /* Set counter reload value to obtain 250ms IWDG TimeOut.
126 Counter Reload Value = 250ms/IWDG counter clock period
127 = 250ms / (LSI/32)
128 = 0.25s / (LsiFreq/32)
129 = LsiFreq/(32 * 4)
130 = LsiFreq/128
131 */
132 IWDG_SetReload(LsiFreq/128);
133
134 /* Reload IWDG counter */
135 IWDG_ReloadCounter();
136
137 /* Enable IWDG (the LSI oscillator will be enabled by hardware) */
138 IWDG_Enable();
139
140 while (1)
141 {
142 /* Toggle LED2 */
143 STM_EVAL_LEDToggle(LED2);
144
145 /* Insert 240 ms delay */
146 Delay(240);
147
148 /* Reload IWDG counter */
149 IWDG_ReloadCounter();
150 }
151 }
152
153 /**
154 * @brief Inserts a delay time.
155 * @param nTime: specifies the delay time length, in milliseconds.
156 * @retval None
157 */
158 void Delay(__IO uint32_t nTime)
159 {
160 TimingDelay = nTime;
161
162 while(TimingDelay != 0);
163 }
164
165 #ifdef LSI_TIM_MEASURE
166 /**
167 * @brief Configures TIM5 to measure the LSI oscillator frequency.
168 * @param None
169 * @retval None
170 */
171 void TIM5_ConfigForLSI(void)
172 {
173 NVIC_InitTypeDef NVIC_InitStructure;
174 TIM_ICInitTypeDef TIM_ICInitStructure;
175
176 /* Enable TIM5 clocks */
177 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
178
179 /* Enable the TIM5 Interrupt */
180 NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
181 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
182 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
183 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
184 NVIC_Init(&NVIC_InitStructure);
185
186 /* Configure TIM5 prescaler */
187 TIM_PrescalerConfig(TIM5, 0, TIM_PSCReloadMode_Immediate);
188
189 /* Connect internally the TM5_CH4 Input Capture to the LSI clock output */
190 GPIO_PinRemapConfig(GPIO_Remap_TIM5CH4_LSI, ENABLE);
191
192 /* TIM5 configuration: Input Capture mode ---------------------
193 The LSI oscillator is connected to TIM5 CH4
194 The Rising edge is used as active edge,
195 The TIM5 CCR4 is used to compute the frequency value
196 ------------------------------------------------------------ */
197 TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;
198 TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
199 TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
200 TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV8;
201 TIM_ICInitStructure.TIM_ICFilter = 0;
202 TIM_ICInit(TIM5, &TIM_ICInitStructure);
203
204 /* TIM10 Counter Enable */
205 TIM_Cmd(TIM5, ENABLE);
206
207 /* Reset the flags */
208 TIM5->SR = 0;
209
210 /* Enable the CC4 Interrupt Request */
211 TIM_ITConfig(TIM5, TIM_IT_CC4, ENABLE);
212 }
213 #endif
214
215 #ifdef USE_FULL_ASSERT
216
217 /**
218 * @brief Reports the name of the source file and the source line number
219 * where the assert_param error has occurred.
220 * @param file: pointer to the source file name
221 * @param line: assert_param error line source number
222 * @retval None
223 */
224 void assert_failed(uint8_t* file, uint32_t line)
225 {
226 /* User can add his own implementation to report the file name and line number,
227 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
228
229 /* Infinite loop */
230 while (1)
231 {}
232 }
233
234 #endif
235
236 /**
237 * @}
238 */
239
240 /**
241 * @}
242 */
243
244 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/