Flash Magic Forum

In-System Programming Support => ARM Cortex => Topic started by: thiagorod on April 03, 2018, 12:29:28 pm

Title: LPC1112 Bootloader - shared serial port
Post by: thiagorod on April 03, 2018, 12:29:28 pm

Hello,

Is it still possible to program the LPC1112 via serial port (using the bootloader) even if the serial port is being used by a different IC (serial-USB converter for instance) ? Or is it necessary to add resistors to one of the branches ?

Regards,

Title: Re: LPC1112 Bootloader - shared serial port
Post by: Andy Ayre on April 09, 2018, 03:21:14 am

UART/RS232 is point-to-point and isn't designed for multiple devices to be attached to it. Use jumpers or tri-state outputs instead.

Title: Re: LPC1112 Bootloader - shared serial port
Post by: thiagorod on April 10, 2018, 12:32:34 pm

Thanks for you reply Andy.

I agree with that, I´ve seen some ideas to split the UART, using resistors, diodes, but this is really not recommended, right?

Regards,

Title: Re: LPC1112 Bootloader - shared serial port
Post by: Andy Ayre on April 11, 2018, 01:46:51 am

I wouldn't recommend it.

Andy