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nios-ii

NIOS II 固化程序上电不运行、复位能运行的解决思路 硬件配置:EP3C40F484C6N、AD9218、DDR2 SDRAM、LCD显示屏 软件配置:类似于正点原子开拓者Nios II教程:基于高速 AD/DA 模块的示波器实验。 (波形显示采用 Verilog HDL 来设计,用户界面的绘制在Nios II 中采用 C 语言来设计)

本教程基于这篇教程: 在外部SDRAM中运行的NIOS II程序的固化方法_芯路恒电子技术论坛_巨大八爪鱼的博客-CSDN博客 但是下载进去之后发现上电之后Verilog HDL部分正常运行,而Nios II软件部分不运行,按下复位按钮之后才正常运行。 只用verilog 代码写的程序和不带SDRAM的Nios II程序固化没有任何问题,表明硬件没有问题。 网上找了很多教程都没有类似的问题。然后分析了Nios ii程序上电启动过程、修改ddr、flash地址、尝试三种不同的程序固化方式后发现无济于事。 之后转变思路,手动写一个verilog复位程序,实现上电之后或者硬件复位之后自动给qsys 核复位的效果,程序如下:

reset接qsys复位接口,程序固化后上电正常运行。

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