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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/SysTick/TimeBase/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 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>&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 "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****/