Hi,
I have an embedded system with an AT89C51SNDC1 (which have only one UART) So actually I have only one external serial connection for debugging this UART by a DB9 connector.
for my new application I must implement the reading of data comming from a GPS oem (each second). Because of I have only one UART (on pins P3.0 and P3.1 are connected a debug cable) incoming data from GPS must be connected to the same pins of connector of UART than use for debugging (perhaps only on RX pin of the µc because of GPS incoming), so I think so but I don't know if it is correct?
for that I suppose to use every short time of each second reading of data coming from GPS in my infinite loop, but how exactly do that? Must I use software interrupts?
In my actual program there is no interrupts.
So how must I implement that, could you help me please?
PS: So I suppose that hardwarelly I will have an external connector with "Y" cable.
Thank you
Best Regards,
Sems
"We will have reduce cost system and will avoid to make a new PCB and lost time."
Remember that the total system cost must include the cost of developing and maintaining the software.
You need to carefully consider how much this single-UART software bodge is going to cost you - not just in developing it in the first place, but also how it will impact on all your other work:
A bodge like this is almost certain to make testing and debugging more cumbersome - in other words, it will add cost.
Maybe it will turn out to be cost-effective in your particular circumstances - but you must not just assume that!