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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/SysTick/TimeBase/main.c @ 89:fc21fb5b171b default tip
Make error message more useful
author | Daniel O'Connor <darius@dons.net.au> |
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date | Fri, 13 Mar 2015 11:39:59 +1030 |
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1 /** |
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2 ****************************************************************************** |
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3 * @file SysTick/TimeBase/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 /* Includes ------------------------------------------------------------------*/ |
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23 #include "main.h" |
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24 |
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25 /** @addtogroup STM32F10x_StdPeriph_Examples |
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26 * @{ |
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27 */ |
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28 |
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29 /** @addtogroup SysTick_TimeBase |
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30 * @{ |
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31 */ |
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32 |
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33 /* Private typedef -----------------------------------------------------------*/ |
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34 /* Private define ------------------------------------------------------------*/ |
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35 /* Private macro -------------------------------------------------------------*/ |
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36 /* Private variables ---------------------------------------------------------*/ |
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37 static __IO uint32_t TimingDelay; |
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38 |
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39 /* Private function prototypes -----------------------------------------------*/ |
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40 void Delay(__IO uint32_t nTime); |
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41 |
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42 /* Private functions ---------------------------------------------------------*/ |
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43 |
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44 /** |
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45 * @brief Main program. |
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46 * @param None |
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47 * @retval None |
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48 */ |
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49 int main(void) |
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50 { |
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51 /*!< At this stage the microcontroller clock setting is already configured, |
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52 this is done through SystemInit() function which is called from startup |
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53 file (startup_stm32f10x_xx.s) before to branch to application main. |
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54 To reconfigure the default setting of SystemInit() function, refer to |
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55 system_stm32f10x.c file |
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56 */ |
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57 |
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58 /* Initialize Leds mounted on STM3210X-EVAL board */ |
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59 STM_EVAL_LEDInit(LED1); |
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60 STM_EVAL_LEDInit(LED2); |
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61 STM_EVAL_LEDInit(LED3); |
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62 STM_EVAL_LEDInit(LED4); |
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63 |
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64 /* Turn on LED1 and LED3 */ |
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65 STM_EVAL_LEDOn(LED1); |
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66 STM_EVAL_LEDOn(LED3); |
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67 |
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68 /* Setup SysTick Timer for 1 msec interrupts. |
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69 ------------------------------------------ |
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70 1. The SysTick_Config() function is a CMSIS function which configure: |
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71 - The SysTick Reload register with value passed as function parameter. |
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72 - Configure the SysTick IRQ priority to the lowest value (0x0F). |
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73 - Reset the SysTick Counter register. |
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74 - Configure the SysTick Counter clock source to be Core Clock Source (HCLK). |
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75 - Enable the SysTick Interrupt. |
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76 - Start the SysTick Counter. |
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77 |
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78 2. You can change the SysTick Clock source to be HCLK_Div8 by calling the |
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79 SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8) just after the |
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80 SysTick_Config() function call. The SysTick_CLKSourceConfig() is defined |
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81 inside the misc.c file. |
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82 |
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83 3. You can change the SysTick IRQ priority by calling the |
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84 NVIC_SetPriority(SysTick_IRQn,...) just after the SysTick_Config() function |
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85 call. The NVIC_SetPriority() is defined inside the core_cm3.h file. |
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86 |
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87 4. To adjust the SysTick time base, use the following formula: |
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88 |
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89 Reload Value = SysTick Counter Clock (Hz) x Desired Time base (s) |
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90 |
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91 - Reload Value is the parameter to be passed for SysTick_Config() function |
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92 - Reload Value should not exceed 0xFFFFFF |
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93 */ |
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94 if (SysTick_Config(SystemCoreClock / 1000)) |
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95 { |
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96 /* Capture error */ |
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97 while (1); |
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98 } |
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99 |
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100 while (1) |
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101 { |
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102 /* Toggle LED2 and LED4 */ |
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103 STM_EVAL_LEDToggle(LED2); |
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104 STM_EVAL_LEDToggle(LED4); |
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105 |
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106 /* Insert 50 ms delay */ |
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107 Delay(50); |
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108 |
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109 /* Toggle LED1 and LED3 */ |
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110 STM_EVAL_LEDToggle(LED1); |
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111 STM_EVAL_LEDToggle(LED3); |
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112 |
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113 /* Insert 100 ms delay */ |
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114 Delay(100); |
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115 } |
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116 } |
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117 |
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118 /** |
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119 * @brief Inserts a delay time. |
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120 * @param nTime: specifies the delay time length, in milliseconds. |
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121 * @retval None |
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122 */ |
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123 void Delay(__IO uint32_t nTime) |
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124 { |
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125 TimingDelay = nTime; |
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126 |
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127 while(TimingDelay != 0); |
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128 } |
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129 |
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130 /** |
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131 * @brief Decrements the TimingDelay variable. |
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132 * @param None |
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133 * @retval None |
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134 */ |
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135 void TimingDelay_Decrement(void) |
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136 { |
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137 if (TimingDelay != 0x00) |
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138 { |
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139 TimingDelay--; |
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140 } |
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141 } |
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142 |
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143 #ifdef USE_FULL_ASSERT |
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144 |
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145 /** |
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146 * @brief Reports the name of the source file and the source line number |
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147 * where the assert_param error has occurred. |
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148 * @param file: pointer to the source file name |
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149 * @param line: assert_param error line source number |
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150 * @retval None |
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151 */ |
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152 void assert_failed(uint8_t* file, uint32_t line) |
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153 { |
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154 /* User can add his own implementation to report the file name and line number, |
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155 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ |
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156 |
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157 /* Infinite loop */ |
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158 while (1) |
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159 { |
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160 } |
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161 } |
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162 |
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163 #endif |
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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 */ |
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172 |
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173 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/ |