DE1-SoC GPIO 能否设定为2.5V呢？

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DE1-SoC GPIO所对应的 FPGA I/O bank 的VCCIO电压是固定的3.3V，因此只能做3.3V信号传输使用。如果要接2.5V 外设，可以尝试自行设计电平转换电路。