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DM8127与SN65HVD11DR通信时只能发,不能收?



大家好:

使用IPNC_RDK_DM812x_DM385_Version3.5.0里提供的rs485_test demo,发现发送是成功的,但接收时一直接收不到数据,用示波器量时发现GPIO1_1一直为高电平,但查看GPIO配置的值是为0。请问各位怎么回事?

打印信息如下:
root@DM8127_IPNC:/opt/ipnc# ./rs485_test
Start.1..
Open.2..
Sending
*******************************
Sending
RS-485 TEST
Sending
*******************************
End of RS485_test
root@DM8127_IPNC:/opt/ipnc# ./rs485_test r
Start.1..
Open.2..

RS485 :: Resource temporarily unavailable
Try to read a charachter from RS485...End of RS485_read_test

root@DM8127_IPNC:/opt/ipnc# cat /sys/class/gpio/gpio33/value
0