海思HIxx系列芯片485_uart代码实现.rar
1. 海思Hixx系列uart程序，完整makefile工程，安装完交叉编译工具链arm-hisiv4xx-linux，可直接在linux下编译，板端运行程序测试。串口测试收发字符串长度可达400以上。大量测试其他人代码只支持32或64，最多190个字符。也是本程序的优势。
2. 485程序，程序上可以使用system("himm 0x200f0078 0x1")，和HI_MPI_SYS_SetReg形式来设置485芯片的DE引脚高低电平变化。但我这里使用的更加巧妙，海思内核是amba架构，所以在linux-3.10.y/drivers/tty/serial/amba-pl011.c中修改内容，重新编译内核，烧录。
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