正点原子stm32f103rct mini开发板
寄存器版
全部五个串口的使用和测试
| 串口 | TX | RX |
|---|---|---|
| 1 | PA9 | PA10 |
| 2 | PA2 | PA3 |
| 3 | PB10 | PB11 |
| 4 | PC10 | PC11 |
| 5* | PC12 | PD2 |
将串口的TX接到ttl转usb模块的RX，RX接到TX，GND接到GND，usb接到电脑
打开串口调试助手，向串口发送一个字符，结果如图：
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a demo for all usart1-3 , uart4-5
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