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主控平台为MTK6737M，主控端自环测试正常。用设置VREF输出2.5V，测试是否建立通信。上图是往07地址写入0x3c的波形。VREF脚位没有电压变化。
图二为ads7871各引脚电压
图三为ads7871硬件原理图
从通信波形看, SPI 通信从机有反应, 返回全为0 哦,
是不是先验证一下硬件, 再看看通信时序, 好象数据格式有问题哦
