RS486 half-duplex driver control in ISP mode.

[lpcware]

Content originally posted in LPCWare by TBC_Koizumi on Wed Mar 05 19:55:09 MST 2014
I am going to try ISP to LPC1226/301.
But,Unfortunately, RS486 half-duplex driver is connected to all the UART of a device.
For the reason, in ISP mode, gate control of a driver cannot be performed and communication of "Flash Magic" is not materialized.
Is it impossible to customize the "Built in ISP" program?

[lpcware]

Content originally posted in LPCWare by TBC_Koizumi on Thu Mar 06 23:12:40 MST 2014
I appreciate your cooperation.
Please look at the waveform which I attached.

CH1(Yellow) RxD0 (PIO0_1)
CH2(Green)  TxD0 (PIO0_2)
CH3(Blue)   RTSO (PIO0_0:TxE0)

To be sure, although the signal from "Flash Magic" is received and the device tends to answer, since RTS0(TxE0) is maintaining L (Receive), it cannot transmit.
A setup of "FLASH MAGIC" is also attached.
Why doesn't it drive an RTS line?

[lpcware]

Content originally posted in LPCWare by embd02161991 on Thu Mar 06 18:30:33 MST 2014
Hi,

Flash magic allows you to use RS485 protocol which implements half duplex communication. There is a check box in the advanced options menu for half duplex communication.

You can refer to Flash Magic manual for more information.

Thanks,

NXP Technical Support

[jespermadsen]

Do you know any particular reason why Flash Magic don't support half duplex with LPC8xx ?

Is the bootloader different?