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自制开源ez-fet无法下载程序

本人自制了一个开源ez-fet,usb驱动部分连接正常,绿灯正常亮起,使用IAR5.6调试程序时红灯闪一下,然后提示无法设置电压什么的,下载程序失败,请问是什么原因?硬件电路是按照资料包提供的