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将 C6455 将 GPIO5使用CSL配置为中断模式，并调用C64_enable使能，其他在 BIOS图形界面下配置HWI_INT5i，nterrupt number 为56勾选gUsedispatchar，但ISR始终未置位。
参考一下下面wiki网站上的配置。http://processors.wiki.ti.com/index.php/Setting_up_interrupts_in_DSP_BIOS检查一下IER, GIE使能了没？ IFR位置有没有置1(表示中断发生)？
