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gpio_request(sw_uport->rs485oe_io.gpio, NULL); gpio_direction_output(sw_uport->rs485oe_io.gpio, sw_uport->rs485_fl);
驱动使用了某个GPIO,再应用程序中也用到这个GPIO会怎样?
先申请再使用,直接输出会冲突。 驱动用到了也需要驱动释放然后这里重新申请使用
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