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CC1310: CC1310 iic 起始位时长配置

Part Number: CC1310

有一个iic设备,支持400KHz通讯速度,对时序有一个要求,就是传输的起始位 SDA要比SCL拉低要早5us,实测CC1310只有1.5us, 有没有办法让CC1310的iic在传输数据时,先把sda拉低3.5us,再正常发送起始位?