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#int_rda help

 
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xindy
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#int_rda help
PostPosted: Tue Apr 08, 2008 4:13 am     Reply with quote
hi everyone. my development kit has a microcontroller(18f4525) and a gsm module is attached to it. i have also incorporated an external UART and connect it directly to the PC. my question is if i use the interrupt #int_rda, is there a way of knowing where the available receive data in buffer 0 is coming from? is it coming from the GSM module or is it coming from the PC.. please help..
Matro
Guest
PostPosted: Tue Apr 08, 2008 4:21 am     Reply with quote
#int_RDA can only be triggered by the PIC built-in hardware USART module, but in no way by an external module.

Matro.
Ttelmah
Guest
PostPosted: Tue Apr 08, 2008 4:42 am     Reply with quote
If you are using an external UART chip, this will normally have an interrupt _output_. This will need to be connected to another interrupt input on the chip (INT_EXT normally). You will only receive an RDA interrupt for the internal UART, but with this extra connection, you will receive an INT_EXT, for the external UART.

Best Wishes
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