Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

uC/OS-II ISR questions

Is it true that all ISRs for uC/OS-II must be written in assembly language? How is an ISR "attached" to a specific interrupt? Does anybody have an example that I could see (CPU register st...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

The interrupt entry point must be written in assembly, however this is provided for you with the Nios II port of microC/OS-II. Individual ISR's can be written in C. You can attach to an interrupt using the standard HAL alt_irq_register() function, as described in the Nios II software developer's handbook. In addition, you can look at the HAL device drivers for examples (e.g. the JTAG UART driver).