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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/NVIC/IRQ_Mask/readme.txt @ 44:f1cc171b06b5

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Remove useless delay test. Add GPIO PE2 changes to make testing arbitary delays possible.
author Daniel O'Connor <darius@dons.net.au>
date Tue, 02 Apr 2013 10:54:20 +1030
parents c59513fd84fb
children
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1 /**
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2 @page NVIC_IRQ_Mask NVIC IRQ Mask example
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3
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4 @verbatim
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5 ******************** (C) COPYRIGHT 2011 STMicroelectronics *******************
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6 * @file NVIC/IRQ_Mask/readme.txt
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7 * @author MCD Application Team
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8 * @version V3.5.0
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9 * @date 08-April-2011
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10 * @brief Description of the NVIC IRQ Mask example.
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11 ******************************************************************************
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12 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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13 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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14 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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15 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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16 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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17 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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18 ******************************************************************************
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19 @endverbatim
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20
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21 @par Example Description
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22
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23 This example demontrates the use of the Nested Vectored Interrupt Controller (NVIC)
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24 IRQ Channels configuration and how to mask/activate different IRQs:
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25
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26 - Configuration of 3 TIM (TIM2..TIM4)timers to generate an interrupt on each
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27 counter update event.
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28
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29 - The three timers are linked to their correspondant Update IRQ channel.
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30
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31 - Assignment of a ascendant IRQ priority for each IRQ channel :
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32 - TIM2 has a preemption priority of 0
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33 - TIM3 has a preemption priority of 1
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34 - TIM4 has a preemption priority of 2
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35 - In each interrupt routine:
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36 - TIM2 toggles a LED1 each 1s
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37 - TIM3 toggles a LED2 each 2s
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38 - TIM4 toggles a LED3 each 3s
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39
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40 - The KEY and WAKEUP buttons are used to boost the execution priority as follows:
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41
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42 - The KEY button is used in GPIO mode and at each KEY button press, the execution
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43 priority is raised to 0 and turn LED4 ON. This prevents all exceptions with
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44 configurable priority from activating, other than through the HardFault fault
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45 escalation mechanism. As consequence, all LEDs stop toggling as TIM2, TIM3
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46 and TIM4 IRQs are prevented from activation.
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47
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48 Pressing again the KEY button will release the priority boosting, turn LED4
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49 OFF and will allow all exceptions with configurable priority to be activated
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50 and TIM2, TIM3 and TIM4 can be generated again and the LEDs restart toggling.
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51
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52 This execution priority is made using the CMSIS functions "__disable_irq()"
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53 and "__enable_irq()".
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54 These two functions are managing the Cortex-M3 PRIMASK special register.
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55
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56 - The WAKEUP button is used in EXTI mode and at each WAKEUP button press, the execution
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57 priority is masked to 0x40 using the BASEPRI register.
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58 A non-zero value will act as a priority mask, affecting the execution priority
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59 when the priority defined by BASEPRI is the same or higher than the current
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60 executing priority.
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61 As consequence, LED2 and LED3 stop toggling as TIM3 and TIM4 IRQs are
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62 prevented from activation.
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63 Pressing again the WAKEUP button will configure the BASEPRI register to 0,
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64 thus it has no effect on the current priority and TIM3 and TIM4 can be
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65 generated again and LED2 and LED3 restart toggling.
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66
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67 This execution priority is made using the CMSIS functions "__set_BASEPRI()".
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68 This function is managing the Cortex-M3 BASEPRI special register.
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69 Setting the BASEPRI register has no effect when the execution priority is
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70 raised to 0 using the "__disable_irq()" function.
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71
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72 @note These mechanisms only affect the group priority. They have no effect on
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73 the sub-priority. The sub-priority is only used to sort pending exception
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74 priorities, and does not affect active exceptions.
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75
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76 @par Directory contents
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77
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78 - NVIC/IRQ_Mask/stm32f10x_conf.h Library Configuration file
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79 - NVIC/IRQ_Mask/stm32f10x_it.c Interrupt handlers
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80 - NVIC/IRQ_Mask/stm32f10x_it.h Interrupt handlers header file
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81 - NVIC/IRQ_Mask/main.c Main program
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82 - NVIC/IRQ_Mask/system_stm32f10x.c STM32F10x system source file
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83
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84 @par Hardware and Software environment
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85
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86 - This example runs on STM32F10x Connectivity line, High-Density, High-Density
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87 Value line, Medium-Density, XL-Density, Medium-Density Value line, Low-Density
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88 and Low-Density Value line Devices.
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89
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90 - This example has been tested with STMicroelectronics STM32100E-EVAL (High-Density
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91 Value line), STM32100B-EVAL (Medium-Density Value line), STM3210C-EVAL (Connectivity line),
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92 STM3210E-EVAL (High-Density and XL-Density) and STM3210B-EVAL (Medium-Density)
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93 evaluation boards and can be easily tailored to any other supported device
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94 and development board.
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95 To select the STMicroelectronics evaluation board used to run the example,
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96 uncomment the corresponding line in stm32_eval.h file (under Utilities\STM32_EVAL)
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97
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98 - STM32100E-EVAL Set-up
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99 - Use LED1, LED2, LED3 and LED4 leds connected respectively to PF.06, PF.07
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100 PF.08 and PF.09
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101 - Use the Key push-button connected to pin PG.08 (EXTI Line8).
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102 - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
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103 @note the jumper JP4 must be not fit to be able to use the Wakeup push-button
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104
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105 - STM32100B-EVAL Set-up
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106 - Use LED1, LED2, LED3 and LED4 leds connected respectively to PC.06, PC.07,
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107 PC.08 and PC.09
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108 - Use the Key push-button connected to pin PB.09 (EXTI Line9).
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109 - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
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110
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111 - STM3210C-EVAL Set-up
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112 - Use LED1, LED2, LED3 and LED4 connected respectively to PD.07, PD.13, PF.03
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113 and PD.04 pins
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114 - Use the Key push-button connected to pin PB.09 (EXTI Line9).
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115 - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
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116 @note Make sure that the Jumper 14 is in position 2<->3.
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117
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118 - STM3210E-EVAL Set-up
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119 - Use LED1, LED2, LED3 and LED4 leds connected respectively to PF.06, PF.07
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120 PF.08 and PF.09
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121 - Use the Key push-button connected to pin PG.08 (EXTI Line8).
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122 - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
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123 @note the jumper JP4 must be not fit to be able to use the Wakeup push-button
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124
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125 - STM3210B-EVAL Set-up
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126 - Use LED1, LED2, LED3 and LED4 leds connected respectively to PC.06, PC.07,
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127 PC.08 and PC.09
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128 - Use the Key push-button connected to pin PB.09 (EXTI Line9).
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129 - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
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130
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131 @par How to use it ?
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132
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133 In order to make the program work, you must do the following :
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134 - Copy all source files from this example folder to the template folder under
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135 Project\STM32F10x_StdPeriph_Template
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136 - Open your preferred toolchain
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137 - Rebuild all files and load your image into target memory
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138 - Run the example
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139
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140 @note
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141 - Low-density Value line devices are STM32F100xx microcontrollers where the
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142 Flash memory density ranges between 16 and 32 Kbytes.
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143 - Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx
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144 microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
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145 - Medium-density Value line devices are STM32F100xx microcontrollers where
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146 the Flash memory density ranges between 64 and 128 Kbytes.
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147 - Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx
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148 microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
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149 - High-density Value line devices are STM32F100xx microcontrollers where
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150 the Flash memory density ranges between 256 and 512 Kbytes.
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151 - High-density devices are STM32F101xx and STM32F103xx microcontrollers where
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152 the Flash memory density ranges between 256 and 512 Kbytes.
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153 - XL-density devices are STM32F101xx and STM32F103xx microcontrollers where
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154 the Flash memory density ranges between 512 and 1024 Kbytes.
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155 - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
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156
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157 * <h3><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h3>
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158 */