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Even with interrupt based transmission I would still have to use a function like sprintf in the ISR.

There is a lot of stuff happening in the main loop, like talking to a modem, reading/writing to a flash memory etc. It does not always takes 1 second, but it happens often.

The ACK string is 10 characters, it includes a hex representation of a checksum. Currently I use "%02X" in the fprintf for string formatting and it works fine.

Also remember that interr ...

I am using a serial device that expects an "ACK" very very quickly.
Sending the "ACK" in the main loop is not an option, because the period of the main loop is larger than require ...

Spot on. Thanks a lot. My program definitely works now.
Apologies for any inconvenience caused by me by not posting a compilable program.

I think it is a compiler bug, I need help to go around it.
When I try to initialize the struct, the value assigned to a variable (any possibly others as well) is garbled up.

uController: PIC18F46K ...

Are all the peripherals turned off when you create a new project in CCS?
Or do I have explicitly turn off modules such as ADC, comparators, UART and PWM to cut down on power consumption?

Any poin ...

Many of the standard C functions are implemented in a very non-standard way by CCS.
For example:
isspace() returns true for only ' ' and not for tabs and line feeds.
atoi does not skip the spaces i ...

Thanks a lot for the responses.
I went ahead and implemented the queue using linked lists, but I went a step further and implement a generic queue.

This was my first time writing code with dynamic ...

Would it be a good idea to implement a linked list based queue using malloc to maintain a queue of strings?
The char array would be 200 bytes each and size of queue would not increase beyond 5-6 node ...

I'm lost trying to understand what you're trying to accomplish. It's an easy task to setup 4 ISRs for the 4 hardware UARTs your PIC has(very,very few have 4 UARTs !).What PIC are you using??
Using t ...

You still have to change the interrupt enable as well.

Your approach seems pointless, since you are not adding buffering (just one character). Why not use the internal buffering?. Easier, and safer ...

Thanks for the replies.

I am doing it like following:

#if MY_DEVICE_STREAM==UART_PORT1
#define MY_DEVICE_RDA INT_RDA
#INT_RDA
#ELIF MY_DEVICE_STREAM==UART_PORT2
#define MY_DEVICE_RD ...

How to I #define a Pre-Processor directive? I want this so that I can easily move devices between UART Ports.

I want something like this:

#define device2ISR INT_RDA3

#device2ISR
void myISR ...

How do I declare a constant int in a struct.
I am trying to do the following, but its causing compilation error.

typedef struct{
const uint16_t baud;
char delimiter[5];
} ...