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@ -0,0 +1,45 @@
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# 教程 07 - 时间戳
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## tl;dr
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- 我们为计时器硬件添加了抽象，并在`_arch/aarch64`中实现了ARM架构计时器。
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- 新的计时器函数用于给UART打印添加时间戳，并且用于消除`GPIO`设备驱动中基于周期的延迟，从而提高准确性。
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- 添加了`warn!()`宏。
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## 测试它
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请通过 chainboot 进行检查（在上一个教程中添加）。
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```console
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$ make chainboot
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[...]
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Minipush 1.0
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[MP] ⏳ Waiting for /dev/ttyUSB0
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[MP] ✅ Serial connected
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[MP] 🔌 Please power the target now
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__ __ _ _ _ _
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| \/ (_)_ _ (_) | ___ __ _ __| |
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| |\/| | | ' \| | |__/ _ \/ _` / _` |
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|_| |_|_|_||_|_|____\___/\__,_\__,_|
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Raspberry Pi 3
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[ML] Requesting binary
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[MP] ⏩ Pushing 12 KiB =========================================🦀 100% 0 KiB/s Time: 00:00:00
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[ML] Loaded! Executing the payload now
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[ 0.143123] mingo version 0.7.0
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[ 0.143323] Booting on: Raspberry Pi 3
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[ 0.143778] Architectural timer resolution: 52 ns
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[ 0.144352] Drivers loaded:
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[ 0.144688] 1. BCM PL011 UART
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[ 0.145110] 2. BCM GPIO
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[W 0.145469] Spin duration smaller than architecturally supported, skipping
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[ 0.146313] Spinning for 1 second
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[ 1.146715] Spinning for 1 second
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[ 2.146938] Spinning for 1 second
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```
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## 相比之前的变化（diff）
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请检查[英文版本](README.md#diff-to-previous)，这是最新的。
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James Zow
7 months ago
committed by
GitHub