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[bsp][stm32] 为文档添加 ADC 驱动教程
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
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#### 5.3.2 ADC 外设驱动添加教程
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1. 打开 STM32CubeMX 工程,设置 ADC 在 Cube 里的选项。如下图:
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
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2. 打开 stm32/stm32f429-atk-apollo/board/Kconfig ,添加 Kconfig 选项。选中自己添加的选项后,生成一遍工程。如下图:
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
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3. 打开工程进行编译,工程会提示 ADC1_CONFIG 未定义。 可以在 stm32/libraries/HAL_Drivers/config/f4/adc_config.h 中进行定义。
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
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
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