摘要：
Abstract本文简单描述如何使用sys_clk_timer服务，来控制led每100ms开关一次。使用环境：Altera Quartus 9.1 SP1 + Nios II 9.1 Software Build Tools for Eclipse SP1Introduction步骤1 在SOPC Builder中例化Interval Timer核：1. 在SOPC Builder中例化Interval Timer核，命名为sys_clk_timer。图1 例化Interval Timer核注意：命名为sys_clk_timer只是为了和BSP中sys_clk_timer一致，也可以命名为其 阅读全文
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When nothing seems help,i go and look at a stonecutter hammering away his rock perhaps a hundred times without as much as a crack showing in it .Yet at the hundred and first blowit will split in two ,and i know it was not that did it ---but all that had gone before.