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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/IWDG/IWDG_Reset/main.c @ 85:18b154c447bb

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Add note about 1-wire wiring
author Daniel O'Connor <darius@dons.net.au>
date Thu, 12 Mar 2015 23:22:11 +1030
parents c59513fd84fb
children
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1 /**
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2 ******************************************************************************
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3 * @file IWDG/IWDG_Reset/main.c
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4 * @author MCD Application Team
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5 * @version V3.5.0
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6 * @date 08-April-2011
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7 * @brief Main program body.
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8 ******************************************************************************
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9 * @attention
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10 *
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11 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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12 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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13 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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14 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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15 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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16 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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17 *
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18 * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
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19 ******************************************************************************
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20 */
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21
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22 /* Includes ------------------------------------------------------------------*/
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23 #include "stm32f10x.h"
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24 #include "stm32_eval.h"
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25
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26 /** @addtogroup STM32F10x_StdPeriph_Examples
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27 * @{
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28 */
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29
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30 /** @addtogroup IWDG_Reset
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31 * @{
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32 */
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33
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34 /* Private typedef -----------------------------------------------------------*/
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35 /* Private define ------------------------------------------------------------*/
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36 /* Uncomment/Comment depending on your STM32 device.
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37 The LSI is internally connected to TIM5 IC4 only on STM32F10x Connectivity
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38 line, High-Density Value line, High-Density and XL-Density Devices */
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39 #define LSI_TIM_MEASURE
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40
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41 /* Private macro -------------------------------------------------------------*/
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42 /* Private variables ---------------------------------------------------------*/
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43 __IO uint32_t TimingDelay = 0;
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44 __IO uint32_t LsiFreq = 40000;
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45 extern __IO uint16_t CaptureNumber;
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46
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47 /* Private function prototypes -----------------------------------------------*/
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48 void Delay(__IO uint32_t nTime);
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49 void TIM5_ConfigForLSI(void);
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50
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51 /* Private functions ---------------------------------------------------------*/
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52
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53 /**
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54 * @brief Main program.
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55 * @param None
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56 * @retval None
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57 */
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58 int main(void)
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59 {
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60 /*!< At this stage the microcontroller clock setting is already configured,
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61 this is done through SystemInit() function which is called from startup
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62 file (startup_stm32f10x_xx.s) before to branch to application main.
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63 To reconfigure the default setting of SystemInit() function, refer to
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64 system_stm32f10x.c file
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65 */
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66
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67 /* Initialize LED1 and Key Button mounted on STM3210X-EVAL board */
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68 STM_EVAL_LEDInit(LED1);
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69 STM_EVAL_LEDInit(LED2);
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70 STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
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71
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72 /* Setup SysTick Timer for 1 msec interrupts */
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73 if (SysTick_Config(SystemCoreClock / 1000))
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74 {
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75 /* Capture error */
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76 while (1);
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77 }
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78
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79
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80 /* Check if the system has resumed from IWDG reset */
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81 if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET)
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82 {
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83 /* IWDGRST flag set */
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84 /* Turn on LED1 */
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85 STM_EVAL_LEDOn(LED1);
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86
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87 /* Clear reset flags */
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88 RCC_ClearFlag();
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89 }
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90 else
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91 {
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92 /* IWDGRST flag is not set */
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93 /* Turn off LED1 */
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94 STM_EVAL_LEDOff(LED1);
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95 }
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96
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97 #ifdef LSI_TIM_MEASURE
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98 /* Enable the LSI OSC */
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99 RCC_LSICmd(ENABLE);
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100
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101 /* Wait till LSI is ready */
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102 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
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103 {}
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104
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105 /* TIM Configuration -------------------------------------------------------*/
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106 TIM5_ConfigForLSI();
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107
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108 /* Wait until the TIM5 get 2 LSI edges */
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109 while(CaptureNumber != 2)
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110 {
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111 }
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112
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113 /* Disable TIM5 CC4 Interrupt Request */
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114 TIM_ITConfig(TIM5, TIM_IT_CC4, DISABLE);
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115 #endif
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116
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117 /* IWDG timeout equal to 250 ms (the timeout may varies due to LSI frequency
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118 dispersion) */
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119 /* Enable write access to IWDG_PR and IWDG_RLR registers */
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120 IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
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121
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122 /* IWDG counter clock: LSI/32 */
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123 IWDG_SetPrescaler(IWDG_Prescaler_32);
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124
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125 /* Set counter reload value to obtain 250ms IWDG TimeOut.
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126 Counter Reload Value = 250ms/IWDG counter clock period
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127 = 250ms / (LSI/32)
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128 = 0.25s / (LsiFreq/32)
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129 = LsiFreq/(32 * 4)
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130 = LsiFreq/128
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131 */
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132 IWDG_SetReload(LsiFreq/128);
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133
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134 /* Reload IWDG counter */
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135 IWDG_ReloadCounter();
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136
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137 /* Enable IWDG (the LSI oscillator will be enabled by hardware) */
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138 IWDG_Enable();
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139
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140 while (1)
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141 {
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142 /* Toggle LED2 */
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143 STM_EVAL_LEDToggle(LED2);
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144
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145 /* Insert 240 ms delay */
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146 Delay(240);
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147
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148 /* Reload IWDG counter */
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149 IWDG_ReloadCounter();
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150 }
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151 }
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152
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153 /**
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154 * @brief Inserts a delay time.
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155 * @param nTime: specifies the delay time length, in milliseconds.
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156 * @retval None
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157 */
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158 void Delay(__IO uint32_t nTime)
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159 {
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160 TimingDelay = nTime;
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161
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162 while(TimingDelay != 0);
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163 }
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164
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165 #ifdef LSI_TIM_MEASURE
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166 /**
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167 * @brief Configures TIM5 to measure the LSI oscillator frequency.
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168 * @param None
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169 * @retval None
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170 */
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171 void TIM5_ConfigForLSI(void)
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172 {
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173 NVIC_InitTypeDef NVIC_InitStructure;
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174 TIM_ICInitTypeDef TIM_ICInitStructure;
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175
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176 /* Enable TIM5 clocks */
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177 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
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178
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179 /* Enable the TIM5 Interrupt */
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180 NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
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181 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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182 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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183 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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184 NVIC_Init(&NVIC_InitStructure);
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185
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186 /* Configure TIM5 prescaler */
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187 TIM_PrescalerConfig(TIM5, 0, TIM_PSCReloadMode_Immediate);
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188
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189 /* Connect internally the TM5_CH4 Input Capture to the LSI clock output */
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190 GPIO_PinRemapConfig(GPIO_Remap_TIM5CH4_LSI, ENABLE);
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191
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192 /* TIM5 configuration: Input Capture mode ---------------------
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193 The LSI oscillator is connected to TIM5 CH4
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194 The Rising edge is used as active edge,
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195 The TIM5 CCR4 is used to compute the frequency value
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196 ------------------------------------------------------------ */
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197 TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;
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198 TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
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199 TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
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200 TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV8;
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201 TIM_ICInitStructure.TIM_ICFilter = 0;
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202 TIM_ICInit(TIM5, &TIM_ICInitStructure);
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203
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204 /* TIM10 Counter Enable */
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205 TIM_Cmd(TIM5, ENABLE);
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206
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207 /* Reset the flags */
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208 TIM5->SR = 0;
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209
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210 /* Enable the CC4 Interrupt Request */
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211 TIM_ITConfig(TIM5, TIM_IT_CC4, ENABLE);
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212 }
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213 #endif
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214
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215 #ifdef USE_FULL_ASSERT
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216
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217 /**
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218 * @brief Reports the name of the source file and the source line number
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219 * where the assert_param error has occurred.
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220 * @param file: pointer to the source file name
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221 * @param line: assert_param error line source number
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222 * @retval None
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223 */
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224 void assert_failed(uint8_t* file, uint32_t line)
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225 {
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226 /* User can add his own implementation to report the file name and line number,
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227 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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228
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229 /* Infinite loop */
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230 while (1)
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231 {}
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232 }
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233
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234 #endif
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235
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236 /**
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237 * @}
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238 */
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239
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240 /**
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241 * @}
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242 */
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243
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244 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/