Mikroc Uart Interrupt Example
Another item to note is how the UART TX interrupt functions. I would suggest reading thoroughly the reference manual UART section because this describes how UART TX interrupts function as you have to configure the UTXISEL bit field correctly - this bit field is in one of the UART control registers. It is definitely not uncommon to see the TX IRQ flag set once you enable the transmitter of a particular UART during program initialization. This is because it is signaling that the TX buffer is empty. Again, you will need to read the reference manual UART section for your PIC32. Many have thought that this interrupt is generated once you send a byte as some other MCU's handle this event. Regsvr32 windows 10 64 bit. PIC32's signal that the buffer is empty to some extent - again how UTXISEL is configured.
The way that I have used this interrupt in the past is to get some UART TX buffer primed with data and only enable the interrupt once this is completed. In the ISR, I would send a byte at a time. This event lets the processor/target application know that the UART TX hardened buffer is able to be loaded without issue. Once the TX buffer is depleted, I would disable the interrupt until there is more data to TX for whatever reason the application would have to complete this task - then repeat the process for another TX. If you simply keep the interrupt enabled 100% of the time, you would most likely be spending a ton of time constantly going into (and out of hopefully) this ISR as this interrupt is persistent. Another great approach to handling UART TX is to use DMA, but this requires knowledge of the DMA controller.
Zynq Interrupt Example
Mikroc Uart Interrupt Examples
To attain this knowledge the best, again, the reference material is where I would start. This is definitely a great way to offload the processor. This is probably the most efficient way to use the UART TX as polling without question is a waste of time (UART is many times slower than MCU) and interrupts still have to handle context switching - i.e. SW controls to a great extent still to handle transmitting all UART data. DMA will have the minimal intervention of the CPU to perform the UART TX. You will sacrifice some internal bus cycles for DMA, but this should be very negligible - hopefully depending on how one uses this.