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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/WWDG/WWDG_Reset/main.c @ 44:f1cc171b06b5
Remove useless delay test. Add GPIO PE2 changes to make testing arbitary delays possible.
author | Daniel O'Connor <darius@dons.net.au> |
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date | Tue, 02 Apr 2013 10:54:20 +1030 |
parents | c59513fd84fb |
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rev | line source |
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1 /** |
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2 ****************************************************************************** |
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3 * @file WWDG/WWDG_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>© 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 |
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23 /* Includes ------------------------------------------------------------------*/ |
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24 #include "stm32f10x.h" |
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25 #include "stm32_eval.h" |
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26 |
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27 /** @addtogroup STM32F10x_StdPeriph_Examples |
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28 * @{ |
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29 */ |
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30 |
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31 /** @addtogroup WWDG_Reset |
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32 * @{ |
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33 */ |
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34 |
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35 /* Private typedef -----------------------------------------------------------*/ |
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36 /* Private define ------------------------------------------------------------*/ |
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37 /* Private macro -------------------------------------------------------------*/ |
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38 /* Private variables ---------------------------------------------------------*/ |
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39 __IO uint32_t TimingDelay = 0; |
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40 |
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41 /* Private function prototypes -----------------------------------------------*/ |
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42 void Delay(__IO uint32_t nTime); |
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43 |
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44 /* Private functions ---------------------------------------------------------*/ |
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45 |
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46 /** |
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47 * @brief Main program. |
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48 * @param None |
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49 * @retval None |
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50 */ |
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51 int main(void) |
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52 { |
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53 /*!< At this stage the microcontroller clock setting is already configured, |
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54 this is done through SystemInit() function which is called from startup |
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55 file (startup_stm32f10x_xx.s) before to branch to application main. |
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56 To reconfigure the default setting of SystemInit() function, refer to |
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57 system_stm32f10x.c file |
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58 */ |
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59 |
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60 /* Initialize LED1 and Key Button mounted on STM3210X-EVAL board */ |
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61 STM_EVAL_LEDInit(LED1); |
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62 STM_EVAL_LEDInit(LED2); |
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63 STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI); |
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64 |
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65 |
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66 /* Check if the system has resumed from WWDG reset */ |
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67 if (RCC_GetFlagStatus(RCC_FLAG_WWDGRST) != RESET) |
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68 { |
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69 /* WWDGRST flag set */ |
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70 /* Turn on LED1 */ |
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71 STM_EVAL_LEDOn(LED1); |
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72 |
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73 /* Clear reset flags */ |
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74 RCC_ClearFlag(); |
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75 } |
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76 else |
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77 { |
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78 /* WWDGRST flag is not set */ |
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79 /* Turn off LED1 */ |
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80 STM_EVAL_LEDOff(LED1); |
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81 } |
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82 |
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83 /* Setup SysTick Timer for 1 msec interrupts */ |
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84 if (SysTick_Config(SystemCoreClock / 1000)) |
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85 { |
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86 /* Capture error */ |
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87 while (1); |
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88 } |
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89 |
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90 /* WWDG configuration */ |
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91 /* Enable WWDG clock */ |
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92 RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE); |
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93 |
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94 /* On Value line devices, WWDG clock counter = (PCLK1 (24MHz)/4096)/8 = 732 Hz (~1366 us) */ |
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95 /* On other devices, WWDG clock counter = (PCLK1(36MHz)/4096)/8 = 1099 Hz (~910 us) */ |
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96 WWDG_SetPrescaler(WWDG_Prescaler_8); |
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97 |
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98 /* Set Window value to 80; WWDG counter should be refreshed only when the counter |
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99 is below 80 (and greater than 64) otherwise a reset will be generated */ |
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100 WWDG_SetWindowValue(80); |
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101 |
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102 /* - On Value line devices, |
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103 Enable WWDG and set counter value to 127, WWDG timeout = ~1366 us * 64 = 87.42 ms |
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104 In this case the refresh window is: ~1366us * (127-80) = 64.20 ms < refresh window < ~1366us * 64 = 87.42ms |
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105 - On other devices |
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106 Enable WWDG and set counter value to 127, WWDG timeout = ~910 us * 64 = 58.25 ms |
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107 In this case the refresh window is: ~910 us * (127-80) = 42.77 ms < refresh window < ~910 us * 64 = 58.25ms |
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108 */ |
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109 WWDG_Enable(127); |
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110 |
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111 while (1) |
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112 { |
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113 /* Toggle LED2 */ |
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114 STM_EVAL_LEDToggle(LED2); |
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115 |
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116 #if !defined (STM32F10X_LD_VL) && !defined (STM32F10X_MD_VL) && !defined (STM32F10X_HD_VL) |
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117 /* Insert 44 ms delay */ |
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118 Delay(44); |
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119 #else |
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120 /* Insert 66 ms delay */ |
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121 Delay(66); |
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122 #endif |
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123 |
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124 /* Update WWDG counter */ |
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125 WWDG_SetCounter(127); |
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126 } |
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127 } |
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128 |
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129 /** |
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130 * @brief Inserts a delay time. |
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131 * @param nTime: specifies the delay time length, in milliseconds. |
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132 * @retval None |
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133 */ |
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134 void Delay(__IO uint32_t nTime) |
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135 { |
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136 TimingDelay = nTime; |
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137 while(TimingDelay != 0) |
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138 { |
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139 } |
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140 } |
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141 |
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142 #ifdef USE_FULL_ASSERT |
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143 |
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144 /** |
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145 * @brief Reports the name of the source file and the source line number |
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146 * where the assert_param error has occurred. |
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147 * @param file: pointer to the source file name |
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148 * @param line: assert_param error line source number |
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149 * @retval None |
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150 */ |
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151 void assert_failed(uint8_t* file, uint32_t line) |
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152 { |
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153 /* User can add his own implementation to report the file name and line number, |
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154 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ |
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155 |
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156 /* Infinite loop */ |
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157 while (1) |
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158 {} |
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159 } |
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160 |
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161 #endif |
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162 |
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163 /** |
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164 * @} |
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165 */ |
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166 |
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167 /** |
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168 * @} |
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169 */ |
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170 |
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171 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/ |