[stm32][doc] update STM32系列外设驱动添加指南.md
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
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
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#### 5.3.4 编码器外设驱动添加说明
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1. 打开 STM32CubeMX 工程,设置 TIMER 在 Cube 里的选项,如下图所示:
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
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2. 打开 stm32/stm32f407-atk-explorer/board/Kconfig ,添加 Kconfig 选项。选中自己添加的选项后,生成一遍工程,如下图所示:
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
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3. 打开工程进行编译,工程会提示 PULSE_ENCODER4_CONFIG 未定义。 可以在 stm32/libraries/HAL_Drivers/config/f4/pulse_encoder_config.h 中进行定义,如下图所示:
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
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
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