23 lines
482 B
Markdown
23 lines
482 B
Markdown
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---
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title: uint64_t打印
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updated: 2022-01-08 14:11:56Z
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created: 2022-01-08 13:18:08Z
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tags:
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- mcu
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- printf
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- 代码块
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- 浮点运算
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---
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stm32cubeIDE默认无法直接用`printf("Freq is %llu.\r\n",tmp)`打印输出
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在开启standard C 后可以正常输出但是占用资源猛增，变通的方法是拼接输出
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```c
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uint8_t tt = (uint8_t)(tmp/1e9)%10; //取最高位
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printf("Freq is %1d%09u.\r\n",tt,(uint32_t)(tmp-tt*1e9));
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```
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#printf
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#mcu
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#代码块
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#浮点运算
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