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update readme.md
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hanwckf committed Aug 27, 2023
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Expand Up @@ -16,13 +16,20 @@ A SPI-NAND flash programmer software botched together using SPI-MEM and SPI-NAND

[WCH CH347](https://www.wch.cn/products/CH347.html)

The default driver. No extra arguments needed.
The default driver.

add the arguments to set CH347 SPI clock (KHz), default is 30000:

```shell
# set CH347 SPI clock to 15MHz
-a 15000
```

[dword1511/stm32-vserprog](https://github.com/dword1511/stm32-vserprog)

add the following arguments to select this driver:

```
```shell
-d serprog -a /dev/ttyACM0
```

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